grab_mapping_entry() has a bug in handling of ENOMEM condition. Suppose
we have a PMD entry at index i which we are downgrading to a PTE entry.
grab_mapping_entry() will set pmd_downgrade to true, lock the entry, clear
the entry in xarray, and decrement mapping->nrpages. The it will call:
entry = dax_make_entry(pfn_to_pfn_t(0), flags);
dax_lock_entry(xas, entry);
which inserts new PTE entry into xarray. However this may fail allocating
the new node. We handle this by:
if (xas_nomem(xas, mapping_gfp_mask(mapping) & ~__GFP_HIGHMEM))
goto retry;
however pmd_downgrade stays set to true even though 'entry' returned from
get_unlocked_entry() will be NULL now. And we will go again through the
downgrade branch. This is mostly harmless except that mapping->nrpages is
decremented again and we temporarily have an invalid entry stored in
xarray. Fix the problem by setting pmd_downgrade to false each time we
lookup the entry we work with so that it matches the entry we found.
Link: https://lkml.kernel.org/r/20210622160015.18004-1-jack@suse.cz
Fixes: b15cd80068 ("dax: Convert page fault handlers to XArray")
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit contains 3 modifications:
1. Convert the type of jiffies_scan_wait to "unsigned long".
2. Use READ/WRITE_ONCE() for accessing "jiffies_scan_wait".
3. Fix the possible wrong memory scanning period. If you set a large
memory scanning period like blow, then the "secs" variable will be
non-zero, however the value of "jiffies_scan_wait" will be zero.
echo "scan=0x10000000" > /sys/kernel/debug/kmemleak
It is because the type of the msecs_to_jiffies()'s parameter is "unsigned
int", and the "secs * 1000" is larger than its max value. This in turn
leads a unexpected jiffies_scan_wait, maybe zero. We corret it by
replacing kstrtoul() with kstrtouint(), and check the msecs to prevent it
larger than UINT_MAX.
Link: https://lkml.kernel.org/r/20210613174022.23044-1-yanfei.xu@windriver.com
Signed-off-by: Yanfei Xu <yanfei.xu@windriver.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
When running the kernel with panic_on_taint, the usual slub debug error
messages are not being printed when object corruption happens. That's
because we panic in add_taint(), which is called before printing the
additional information. This is a bit unfortunate as the error messages
are actually very useful, especially before a panic. Let's fix this by
moving add_taint() after the errors are printed on the console.
Link: https://lkml.kernel.org/r/1623860738-146761-1-git-send-email-quic_c_gdjako@quicinc.com
Signed-off-by: Georgi Djakov <quic_c_gdjako@quicinc.com>
Acked-by: Rafael Aquini <aquini@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Aaron Tomlin <atomlin@redhat.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
alloc_calls and free_calls implementation in sysfs have two issues, one is
PAGE_SIZE limitation of sysfs and other is it does not adhere to "one
value per file" rule.
To overcome this issues, move the alloc_calls and free_calls
implementation to debugfs.
Debugfs cache will be created if SLAB_STORE_USER flag is set.
Rename the alloc_calls/free_calls to alloc_traces/free_traces, to be
inline with what it does.
[faiyazm@codeaurora.org: fix the leak of alloc/free traces debugfs interface]
Link: https://lkml.kernel.org/r/1624248060-30286-1-git-send-email-faiyazm@codeaurora.org
Link: https://lkml.kernel.org/r/1623438200-19361-1-git-send-email-faiyazm@codeaurora.org
Signed-off-by: Faiyaz Mohammed <faiyazm@codeaurora.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Obscuring the pointers that slub shows when debugging makes for some
confusing slub debug messages:
Padding overwritten. 0x0000000079f0674a-0x000000000d4dce17
Those addresses are hashed for kernel security reasons. If we're trying
to be secure with slub_debug on the commandline we have some big problems
given that we dump whole chunks of kernel memory to the kernel logs.
Let's force on the no_hash_pointers commandline flag when slub_debug is on
the commandline. This makes slub debug messages more meaningful and if by
chance a kernel address is in some slub debug object dump we will have a
better chance of figuring out what went wrong.
Note that we don't use %px in the slub code because we want to reduce the
number of places that %px is used in the kernel. This also nicely prints
a big fat warning at kernel boot if slub_debug is on the commandline so
that we know that this kernel shouldn't be used on production systems.
[akpm@linux-foundation.org: fix build with CONFIG_SLUB_DEBUG=n]
Link: https://lkml.kernel.org/r/20210601182202.3011020-5-swboyd@chromium.org
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Petr Mladek <pmladek@suse.com>
Cc: Joe Perches <joe@perches.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Ideally, slab_fix() would be marked with __printf and the format here
would not use \n as that's emitted by the slab_fix(). Make these changes.
Link: https://lkml.kernel.org/r/20210601182202.3011020-4-swboyd@chromium.org
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Petr Mladek <pmladek@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The message argument isn't used here. Let's pass the string to the printk
message so that the developer can figure out what's happening, instead of
guessing that a redzone is being restored, etc.
Link: https://lkml.kernel.org/r/20210601182202.3011020-3-swboyd@chromium.org
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Rientjes <rientjes@google.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Joe Perches <joe@perches.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Petr Mladek <pmladek@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Petch series "slub: Print non-hashed pointers in slub debugging", v3.
I was doing some debugging recently and noticed that my pointers were
being hashed while slub_debug was on the kernel commandline. Let's force
on the no hash pointer option when slub_debug is on the kernel commandline
so that the prints are more meaningful.
The first two patches are something else I noticed while looking at the
code. The message argument is never used so the debugging messages are
not as clear as they could be and the slub_debug=- behavior seems to be
busted. Then there's a printf fixup from Joe and the final patch is the
one that force disables pointer hashing.
This patch (of 4):
Passing slub_debug=- on the kernel commandline is supposed to disable slub
debugging. This is especially useful with CONFIG_SLUB_DEBUG_ON where the
default is to have slub debugging enabled in the build. Due to some code
reorganization this behavior was dropped, but the code to make it work
mostly stuck around. Restore the previous behavior by disabling the
static key when we parse the commandline and see that we're trying to
disable slub debugging.
Link: https://lkml.kernel.org/r/20210601182202.3011020-1-swboyd@chromium.org
Link: https://lkml.kernel.org/r/20210601182202.3011020-2-swboyd@chromium.org
Fixes: ca0cab65ea ("mm, slub: introduce static key for slub_debug()")
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Joe Perches <joe@perches.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Petr Mladek <pmladek@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Currently when size is not supported by kmalloc_index, compiler will
generate a run-time BUG() while compile-time error is also possible, and
better. So change BUG to BUILD_BUG_ON_MSG to make compile-time check
possible.
Also remove code that allocates more than 32MB because current
implementation supports only up to 32MB.
[42.hyeyoo@gmail.com: fix support for clang 10]
Link: https://lkml.kernel.org/r/20210518181247.GA10062@hyeyoo
[vbabka@suse.cz: fix false-positive assert in kernel/bpf/local_storage.c]
Link: https://lkml.kernel.org/r/bea97388-01df-8eac-091b-a3c89b4a4a09@suse.czLink: https://lkml.kernel.org/r/20210511173448.GA54466@hyeyoo
[elver@google.com: kfence fix]
Link: https://lkml.kernel.org/r/20210512195227.245000695c9014242e9a00e5@linux-foundation.org
Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Marco Elver <elver@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Function resiliency_test() is hidden behind #ifdef SLUB_RESILIENCY_TEST
that is not part of Kconfig, so nobody runs it.
This function is replaced with KUnit test for SLUB added by the previous
patch "selftests: add a KUnit test for SLUB debugging functionality".
Link: https://lkml.kernel.org/r/20210511150734.3492-3-glittao@gmail.com
Signed-off-by: Oliver Glitta <glittao@gmail.com>
Reviewed-by: Marco Elver <elver@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Oliver Glitta <glittao@gmail.com>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Daniel Latypov <dlatypov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
SLUB has resiliency_test() function which is hidden behind #ifdef
SLUB_RESILIENCY_TEST that is not part of Kconfig, so nobody runs it.
KUnit should be a proper replacement for it.
Try changing byte in redzone after allocation and changing pointer to next
free node, first byte, 50th byte and redzone byte. Check if validation
finds errors.
There are several differences from the original resiliency test: Tests
create own caches with known state instead of corrupting shared kmalloc
caches.
The corruption of freepointer uses correct offset, the original resiliency
test got broken with freepointer changes.
Scratch changing random byte test, because it does not have meaning in
this form where we need deterministic results.
Add new option CONFIG_SLUB_KUNIT_TEST in Kconfig. Tests next_pointer,
first_word and clobber_50th_byte do not run with KASAN option on. Because
the test deliberately modifies non-allocated objects.
Use kunit_resource to count errors in cache and silence bug reports.
Count error whenever slab_bug() or slab_fix() is called or when the count
of pages is wrong.
[glittao@gmail.com: remove unused function test_exit(), from SLUB KUnit test]
Link: https://lkml.kernel.org/r/20210512140656.12083-1-glittao@gmail.com
[akpm@linux-foundation.org: export kasan_enable/disable_current to modules]
Link: https://lkml.kernel.org/r/20210511150734.3492-2-glittao@gmail.com
Signed-off-by: Oliver Glitta <glittao@gmail.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Daniel Latypov <dlatypov@google.com>
Acked-by: Marco Elver <elver@google.com>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The upcoming SLUB kunit test will be calling kunit_find_named_resource()
from a context with disabled interrupts. That means kunit's test->lock
needs to be IRQ safe to avoid potential deadlocks and lockdep splats.
This patch therefore changes the test->lock usage to spin_lock_irqsave()
and spin_unlock_irqrestore().
Link: https://lkml.kernel.org/r/20210511150734.3492-1-glittao@gmail.com
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Oliver Glitta <glittao@gmail.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Daniel Latypov <dlatypov@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Marco Elver <elver@google.com>
Cc: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
It is better to use __func__ to trace function name.
Link: https://lkml.kernel.org/r/31fdbad5c45cd1e26be9ff37be321b8586b80fee.1624355507.git.gumingtao@xiaomi.com
Signed-off-by: gumingtao <gumingtao@xiaomi.com>
Acked-by: Christoph Lameter <cl@linux.com>
Acked-by: David Rientjes <rientjes@google.com>
Reviewed-by: Aaron Tomlin <atomlin@redhat.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The variable ret is being initialized with a value that is never read, the
assignment is redundant and can be removed.
Addresses-Coverity: ("Unused value")
Link: https://lkml.kernel.org/r/20210613135148.74658-1-colin.king@canonical.com
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
simple_strtoull() is deprecated in some situation since it does not check
for the range overflow, use kstrtoull() instead.
Link: https://lkml.kernel.org/r/20210526092020.554341-3-chenhuang5@huawei.com
Signed-off-by: Chen Huang <chenhuang5@huawei.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
In commit 60f91826ca ("buffer: Avoid setting buffer bits that are
already set"), function set_buffer_##name was added a test_bit() to check
buffer, which is the same as function buffer_##name. The
!buffer_uptodate(bh) here is a repeated check. Remove it.
Link: https://lkml.kernel.org/r/20210425025702.13628-1-wanjiabing@vivo.com
Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The pointer queue is being initialized with a value that is never read and
it is being updated later with a new value. The initialization is
redundant and can be removed.
Addresses-Coverity: ("Unused value")
Link: https://lkml.kernel.org/r/20210513113957.57539-1-colin.king@canonical.com
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The snprintf() function returns the number of bytes which would have been
printed if the buffer was large enough. In other words it can return ">=
remain" but this code assumes it returns "== remain".
The run time impact of this bug is not very severe. The next iteration
through the loop would trigger a WARN() when we pass a negative limit to
snprintf(). We would then return success instead of -E2BIG.
The kernel implementation of snprintf() will never return negatives so
there is no need to check and I have deleted that dead code.
Link: https://lkml.kernel.org/r/20210511135350.GV1955@kadam
Fixes: a860f6eb4c ("ocfs2: sysfile interfaces for online file check")
Fixes: 74ae4e104d ("ocfs2: Create stack glue sysfs files.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The list_head o2hb_node_events is initialized statically. It is
unnecessary to initialize by INIT_LIST_HEAD().
Link: https://lkml.kernel.org/r/20210511115847.3817395-1-yangyingliang@huawei.com
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reported-by: Hulk Robot <hulkci@huawei.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Add an errors=panic mount option to make squashfs trigger a panic when
errors are encountered, similar to several other filesystems. This allows
a kernel dump to be saved using which the corruption can be analysed and
debugged.
Inspired by a pre-fs_context patch by Anton Eliasson.
Link: https://lkml.kernel.org/r/20210527125019.14511-1-vincent.whitchurch@axis.com
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
When checking the file name attribute, we want to ensure that it fits
within the bounds of ATTR_RECORD. To do this, we should check that (attr
record + file name offset + file name length) < (attr record + attr record
length).
However, the original check did not include the file name offset in the
calculation. This means that corrupted on-disk metadata might not caught
by the incorrect file name check, and lead to an invalid memory access.
An example can be seen in the crash report of a memory corruption error
found by Syzbot:
https://syzkaller.appspot.com/bug?id=a1a1e379b225812688566745c3e2f7242bffc246
Adding the file name offset to the validity check fixes this error and
passes the Syzbot reproducer test.
Link: https://lkml.kernel.org/r/20210614050540.289494-1-desmondcheongzx@gmail.com
Signed-off-by: Desmond Cheong Zhi Xi <desmondcheongzx@gmail.com>
Reported-by: syzbot+213ac8bb98f7f4420840@syzkaller.appspotmail.com
Tested-by: syzbot+213ac8bb98f7f4420840@syzkaller.appspotmail.com
Acked-by: Anton Altaparmakov <anton@tuxera.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Here are some of the more common spelling mistakes and typos that I've
found while fixing up spelling mistakes in the kernel in the past few
months.
Link: https://lkml.kernel.org/r/20210514093655.8829-1-colin.king@canonical.com
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The tab stop for Perl files is by default (at least in emacs) to be 4
spaces, where a tab is used for all 8 spaces. Add a local variable
comment to make vim do the same by default, and this will help keep the
file consistent in the future when others edit it via vim and not emacs.
Link: https://lkml.kernel.org/r/20210322214032.293992979@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: "John (Warthog9) Hawley" <warthog9@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Patch series "streamline_config.pl: Fix Perl spacing".
Talking with John Hawley about how vim and emacs deal with Perl files with
respect to tabs and spaces, I found that some of my Perl code in the
kernel had inconsistent spacing. The way emacs handles Perl by default is
to use 4 spaces per indent, but make all 8 spaces into a single tab. Vim
does not do this by default. But if you add the vim variable control:
# vim: softtabstop=4
to a perl file, it makes vim behave the same way as emacs.
The first patch is to change all 8 spaces into a single tab (mostly from
people editing the file with vim). The next patch adds the softtabstop
variable to make vim act like emacs by default.
This patch (of 2):
As Perl code tends to have 4 space indentation, but uses tabs for every 8
spaces, make that consistent in the streamline_config.pl code. Replace
all 8 spaces with a single tab.
Link: https://lkml.kernel.org/r/20210322214032.133596267@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: "John (Warthog9) Hawley" <warthog9@kernel.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
gcc points out a mistake in the mca driver that goes back to before the
git history:
arch/ia64/kernel/mca_drv.c: In function 'init_record_index_pools':
arch/ia64/kernel/mca_drv.c:346:54: error: expression does not compute the number of elements in this array; element typ
e is 'int', not 'size_t' {aka 'long unsigned int'} [-Werror=sizeof-array-div]
346 | for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++)
| ^
This is the same as sizeof(size_t), which is two shorter than the actual
array. Use the ARRAY_SIZE() macro to get the correct calculation instead.
Link: https://lkml.kernel.org/r/20210514214123.875971-1-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Delete the repeated words "to" and "the".
Link: https://lkml.kernel.org/r/20210507184837.10754-1-rdunlap@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kthread_mod_delayed_work() might race with
kthread_cancel_delayed_work_sync() or another kthread_mod_delayed_work()
call. The function lets the other operation win when it sees
work->canceling counter set. And it returns @false.
But it should return @true as it is done by the related workqueue API, see
mod_delayed_work_on().
The reason is that the return value might be used for reference counting.
It has to distinguish the case when the number of queued works has changed
or stayed the same.
The change is safe. kthread_mod_delayed_work() return value is not
checked anywhere at the moment.
Link: https://lore.kernel.org/r/20210521163526.GA17916@redhat.com
Link: https://lkml.kernel.org/r/20210610133051.15337-4-pmladek@suse.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
Reported-by: Oleg Nesterov <oleg@redhat.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Minchan Kim <minchan@google.com>
Cc: <jenhaochen@google.com>
Cc: Martin Liu <liumartin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The syntax without dots is available since commit 43756e347f
("scripts/kernel-doc: Add support for named variable macro arguments").
The same HTML output is produced with and without this patch.
Link: https://lkml.kernel.org/r/20210513161702.1721039-1-j.neuschaefer@gmx.net
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Dave Jones reported the following
This made it into 5.13 final, and completely breaks NFSD for me
(Serving tcp v3 mounts). Existing mounts on clients hang, as do
new mounts from new clients. Rebooting the server back to rc7
everything recovers.
The commit b3b64ebd38 ("mm/page_alloc: do bulk array bounds check after
checking populated elements") returns the wrong value if the array is
already populated which is interpreted as an allocation failure. Dave
reported this fixes his problem and it also passed a test running dbench
over NFS.
Link: https://lkml.kernel.org/r/20210628150219.GC3840@techsingularity.net
Fixes: b3b64ebd38 ("mm/page_alloc: do bulk array bounds check after checking populated elements")
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Reported-by: Dave Jones <davej@codemonkey.org.uk>
Tested-by: Dave Jones <davej@codemonkey.org.uk>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org> [5.13+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
On systems with memory nodes sorted in descending order, for instance Dell
Precision WorkStation T5500, the struct pages for higher PFNs and
respectively lower nodes, could be overwritten by the initialization of
struct pages corresponding to the holes in the memory sections.
For example for the below memory layout
[ 0.245624] Early memory node ranges
[ 0.248496] node 1: [mem 0x0000000000001000-0x0000000000090fff]
[ 0.251376] node 1: [mem 0x0000000000100000-0x00000000dbdf8fff]
[ 0.254256] node 1: [mem 0x0000000100000000-0x0000001423ffffff]
[ 0.257144] node 0: [mem 0x0000001424000000-0x0000002023ffffff]
the range 0x1424000000 - 0x1428000000 in the beginning of node 0 starts in
the middle of a section and will be considered as a hole during the
initialization of the last section in node 1.
The wrong initialization of the memory map causes panic on boot when
CONFIG_DEBUG_VM is enabled.
Reorder loop order of the memory map initialization so that the outer loop
will always iterate over populated memory regions in the ascending order
and the inner loop will select the zone corresponding to the PFN range.
This way initialization of the struct pages for the memory holes will be
always done for the ranges that are actually not populated.
[akpm@linux-foundation.org: coding style fixes]
Link: https://lkml.kernel.org/r/YNXlMqBbL+tBG7yq@kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=213073
Link: https://lkml.kernel.org/r/20210624062305.10940-1-rppt@kernel.org
Fixes: 0740a50b9b ("mm/page_alloc.c: refactor initialization of struct page for holes in memory layout")
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: Boris Petkov <bp@alien8.de>
Cc: Robert Shteynfeld <robert.shteynfeld@gmail.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: David Hildenbrand <david@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
try_grab_compound_head() is used to grab a reference to a page from
get_user_pages_fast(), which is only protected against concurrent freeing
of page tables (via local_irq_save()), but not against concurrent TLB
flushes, freeing of data pages, or splitting of compound pages.
Because no reference is held to the page when try_grab_compound_head() is
called, the page may have been freed and reallocated by the time its
refcount has been elevated; therefore, once we're holding a stable
reference to the page, the caller re-checks whether the PTE still points
to the same page (with the same access rights).
The problem is that try_grab_compound_head() has to grab a reference on
the head page; but between the time we look up what the head page is and
the time we actually grab a reference on the head page, the compound page
may have been split up (either explicitly through split_huge_page() or by
freeing the compound page to the buddy allocator and then allocating its
individual order-0 pages). If that happens, get_user_pages_fast() may end
up returning the right page but lifting the refcount on a now-unrelated
page, leading to use-after-free of pages.
To fix it: Re-check whether the pages still belong together after lifting
the refcount on the head page. Move anything else that checks
compound_head(page) below the refcount increment.
This can't actually happen on bare-metal x86 (because there, disabling
IRQs locks out remote TLB flushes), but it can happen on virtualized x86
(e.g. under KVM) and probably also on arm64. The race window is pretty
narrow, and constantly allocating and shattering hugepages isn't exactly
fast; for now I've only managed to reproduce this in an x86 KVM guest with
an artificially widened timing window (by adding a loop that repeatedly
calls `inl(0x3f8 + 5)` in `try_get_compound_head()` to force VM exits, so
that PV TLB flushes are used instead of IPIs).
As requested on the list, also replace the existing VM_BUG_ON_PAGE() with
a warning and bailout. Since the existing code only performed the BUG_ON
check on DEBUG_VM kernels, ensure that the new code also only performs the
check under that configuration - I don't want to mix two logically
separate changes together too much. The macro VM_WARN_ON_ONCE_PAGE()
doesn't return a value on !DEBUG_VM, so wrap the whole check in an #ifdef
block. An alternative would be to change the VM_WARN_ON_ONCE_PAGE()
definition for !DEBUG_VM such that it always returns false, but since that
would differ from the behavior of the normal WARN macros, it might be too
confusing for readers.
Link: https://lkml.kernel.org/r/20210615012014.1100672-1-jannh@google.com
Fixes: 7aef4172c7 ("mm: handle PTE-mapped tail pages in gerneric fast gup implementaiton")
Signed-off-by: Jann Horn <jannh@google.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Jan Kara <jack@suse.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* pm-cpufreq:
cpufreq: Make cpufreq_online() call driver->offline() on errors
cpufreq: loongson2: Remove unused linux/sched.h headers
cpufreq: sh: Remove unused linux/sched.h headers
cpufreq: stats: Clean up local variable in cpufreq_stats_create_table()
cpufreq: intel_pstate: hybrid: Fix build with CONFIG_ACPI unset
cpufreq: sc520_freq: add 'fallthrough' to one case
cpufreq: intel_pstate: Add Cometlake support in no-HWP mode
cpufreq: intel_pstate: Add Icelake servers support in no-HWP mode
cpufreq: intel_pstate: hybrid: CPU-specific scaling factor
cpufreq: intel_pstate: hybrid: Avoid exposing two global attributes
* pm-cpuidle:
cpuidle: teo: remove unneeded semicolon in teo_select()
cpuidle: teo: Use kerneldoc documentation in admin-guide
cpuidle: teo: Rework most recent idle duration values treatment
cpuidle: teo: Change the main idle state selection logic
cpuidle: teo: Cosmetic modification of teo_select()
cpuidle: teo: Cosmetic modifications of teo_update()
intel_idle: Adjust the SKX C6 parameters if PC6 is disabled
* pm-core:
PM: runtime: Clarify documentation when callbacks are unassigned
PM: runtime: Allow unassigned ->runtime_suspend|resume callbacks
PM: runtime: Improve path in rpm_idle() when no callback
PM: runtime: document common mistake with pm_runtime_get_sync()
* pm-sleep:
PM: hibernate: remove leading spaces before tabs
PM: sleep: remove trailing spaces and tabs
PM: hibernate: fix spelling mistakes
PM: wakeirq: Set IRQF_NO_AUTOEN when requesting the IRQ
* acpi-ec:
ACPI: EC: trust DSDT GPE for certain HP laptop
ACPI: EC: Make more Asus laptops use ECDT _GPE
* acpi-apei:
ACPI: APEI: fix synchronous external aborts in user-mode
ACPI: APEI: Don't warn if ACPI is disabled
* acpi-soc:
ACPI: LPSS: Use kstrtol() instead of simple_strtol()
* acpi-misc:
ACPI: NVS: fix doc warnings in nvs.c
ACPI: NUMA: fix typo in a comment
ACPI: OSL: Use DEFINE_RES_IO_NAMED() to simplify code
ACPI: bus: Call kobject_put() in acpi_init() error path
ACPI: bus: Remove unneeded assignment
ACPI: configfs: Replace ACPI_INFO() with pr_debug()
ACPI: ipmi: Remove address space handler in error path
ACPI: event: Remove redundant initialization of local variable
ACPI: sbshc: Fix fall-through warning for Clang
* acpi-prm:
ACPI: PRM: make symbol 'prm_module_list' static
ACPI: Add \_SB._OSC bit for PRM
ACPI: PRM: implement OperationRegion handler for the PlatformRtMechanism subtype
* acpi-sysfs:
ACPI: sysfs: Remove tailing return statement in void function
ACPI: sysfs: Use __ATTR_RO() and __ATTR_RW() macros
ACPI: sysfs: Sort headers alphabetically
ACPI: sysfs: Refactor param_get_trace_state() to drop dead code
ACPI: sysfs: Unify pattern of memory allocations
ACPI: sysfs: Allow bitmap list to be supplied to acpi_mask_gpe
ACPI: sysfs: Make sparse happy about address space in use
ACPI: sysfs: fix doc warnings in device_sysfs.c
ACPI: sysfs: Drop four redundant return statements
ACPI: sysfs: Fix a buffer overrun problem with description_show()
* acpi-x86:
x86/acpi: Switch to pr_xxx log functions
* acpi-pm:
ACPI: PM: postpone bringing devices to D0 unless we need them
ACPI: PM: Adjust behavior for field problems on AMD systems
ACPI: PM: s2idle: Add support for new Microsoft UUID
ACPI: PM: s2idle: Add support for multiple func mask
ACPI: PM: s2idle: Refactor common code
ACPI: PM: s2idle: Use correct revision id
ACPI: power: Use dev_dbg() to print some messages
ACPI: sleep: Fix acpi_pm_pre_suspend() kernel-doc
ACPI: power: Rework turning off unused power resources
ACPI: power: Save the last known state of each power resource
ACPI: power: Use u8 as the power resource state data type
ACPI: PM / fan: Put fan device IDs into separate header file
ACPI: PM: s2idle: Add missing LPS0 functions for AMD
* acpi-processor:
ACPI: processor_throttling: Fix several coding style issues
ACPI: processor_throttling: Remove redundant initialization of 'obj'
ACPI: processor idle: Fix up C-state latency if not ordered
* acpi-resources:
ACPI: resources: Add checks for ACPI IRQ override
* acpica:
ACPICA: Add PRMT module header to facilitate parsing
ACPICA: Update version to 20210604
ACPICA: Add support for PlatformRtMechanism OperationRegion handler
ACPICA: iASL: add disassembler support for PRMT
ACPICA: Add the CFMWS structure definition to the CEDT table
ACPICA: Add defines for the CXL Host Bridge Structure (CHBS)
ACPICA: iASL: Add support for the BDAT ACPI table
ACPICA: Add _PLD panel positions
ACPICA: Use ACPI_FALLTHROUGH
ACPICA: iASL Table Compiler: Add full support for RGRT ACPI table
ACPICA: iASL: Add support for the SVKL table
ACPICA: iASL: Finish support for the IVRS ACPI table
ACPICA: Fix memory leak caused by _CID repair function
ACPICA: Add SVKL table headers
ACPICA: ACPI 6.4: MADT: add Multiprocessor Wakeup Mailbox Structure
Pull operating performance points (OPP) framework updates for v5.14
from Viresh Kumar:
"This pull request:
- allows partial use of required-opps for non-genpd users.
- does a minor cleanup and uses list_del_init()."
* 'opp/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm:
opp: Allow required-opps to be used for non genpd use cases
opp: use list_del_init instead of list_del/INIT_LIST_HEAD
Split __gfs2_unstuff_inode off from gfs2_unstuff_dinode and clean up the
code a little. All remaining callers now pass NULL as the page argument
of gfs2_unstuff_dinode, so remove that argument.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
In gfs2_page_mkwrite, unstuff inodes before locking the page. That
way, we won't have to pass in the locked page to gfs2_unstuff_inode,
and gfs2_unstuff_inode can look up and lock the page itself.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
We're setting an error number so that block_page_mkwrite_return
translates it into the corresponding VM_FAULT_* code in several places,
but this is getting confusing, so set the VM_FAULT_* codes directly
instead. (No change in functionality.)
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
