Previously, init failed to do anything meaningful;
it turns out that the reason is that FD-PIC has a readonly data
section which can be located in the XIP filesystem, and various address checks
in the kernel reject such addresses for syscall arguments. Hence, init's
execve ("/bin/sh", ...)
failed with error code EFAULT.
There's room for improvement here: in case people want to have filesystems
on flash rather than in main memory, _access_ok should be modified to
allow this.
This bug fix is also dedicated to Michael Hennerich.
Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
The function flush_switched_dcplbs was clearing the CPLB entries covering
the process permission bitmasks. This means that the sequence
flush_switched_dcplbs ();
set_mask_dcplbs(mm->context.page_rwx_mask);
has a problem: if kernel code (such as an interrupt) causes a CPLB miss before
set_mask_dcplbs completes, the CPLB handler function causes a double fault,
with an instantaneous reboot.
This bug fix is dedicated to Michael Hennerich, the only person in the world
capable of providing working JTAG hardware.
Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This is a rather old performance improvement for the signal handling
code, which was originally only committed on the 2007R1 branch as a
workaround for what we suspected to be a hardware bug.
There's no point in constructing a sigreturn stub on the stack and
flushing caches; we can just make signal handlers return to a known
location in the fixed code area.
Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
relocate MAX_SWITCH_{D,I}_CPLBS from the header to the file
where it actually gets used. this way when we change
CONFIG_MEM_SIZE in our kconfig, we only rebuild one or two files
rather than a whole bunch that implicitly include cplb.h.
this will also remove the ability to clear the swapcount on
the fly, but i really dont think that functionality is important.
ultimate goal is for CONFIG_MEM_SIZE to go away and calculate
this value on the fly based on what u-boot programmed for us.
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
replace implied numbers with real values so that strace is able to
calculate things automatically ... the numbers are frozen in our ABI,
so having them based off other __NR_xxx values really doesnt matter
-- no functional changes
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
There were a couple of problems with the way the trace buffer state
is saved/restored in assembly. The DEBUG_HWTRACE_SAVE/RESTORE macros
save a value to the stack, which is not immediately obvious; the CPLB
exception code needed changes to load the correct value of the stack
pointer. The other problem is that the SAVE/RESTORE macros weren't
pushing and popping the value downwards on the stack, but rather moving
it _upwards_, which is of course completely broken.
We also need to make sure there's a matching DEBUG_HWTRACE_RESTORE in
the error case of the CPLB handler.
Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
grab locks when not atomic - this fixes the issues
sometimes seen when using magic sysrq.
Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Sometimes when we crash, current is not valid, (has been written
over), so the existing code causes a invalid read during exception
context - which is a unrecoverable double fault. This fixes this.
Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Since
r3658 | vapier | 2007-09-12 16:26:11 +0200 (Wed, 12 Sep 2007) | 1 line
add more common defines for output sections
we've had a new line, NOTES, in our linker script, which causes upstream
binutils to complain about "missing phdr". Currently the only other arch
that uses NOTES is i386, and the patch which added it also added
PHDRS {
text PT_LOAD FLAGS(5); /* R_E */
data PT_LOAD FLAGS(7); /* RWE */
note PT_NOTE FLAGS(0); /* ___ */
}
and a few other modifications to use ":text" and ":data" to the linker
script.
It seems that we don't need NOTES at all, so just remove it.
Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6:
[patch 7/7] vfs: mountinfo: show dominating group id
[patch 6/7] vfs: mountinfo: add /proc/<pid>/mountinfo
[patch 5/7] vfs: mountinfo: allow using process root
[patch 4/7] vfs: mountinfo: add mount peer group ID
[patch 3/7] vfs: mountinfo: add mount ID
[patch 2/7] vfs: mountinfo: add seq_file_root()
[patch 1/7] vfs: mountinfo: add dentry_path()
[PATCH] remove unused label in xattr.c (noise from ro-bind)
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6:
iwlwifi: Fix built-in compilation of iwlcore
net: Unexport move_addr_to_{kernel,user}
rt2x00: Select LEDS_CLASS.
iwlwifi: Select LEDS_CLASS.
leds: Do not guard NEW_LEDS with HAS_IOMEM
[IPSEC]: Fix catch-22 with algorithm IDs above 31
time: Export set_normalized_timespec.
tcp: Make use of before macro in tcp_input.c
hamradio: Remove unneeded and deprecated cli()/sti() calls in dmascc.c
[NETNS]: Remove empty ->init callback.
[DCCP]: Convert do_gettimeofday() to getnstimeofday().
[NETNS]: Don't initialize err variable twice.
[NETNS]: The ip6_fib_timer can work with garbage on net namespace stop.
[IPV4]: Convert do_gettimeofday() to getnstimeofday().
[IPV4]: Make icmp_sk_init() static.
[IPV6]: Make struct ip6_prohibit_entry_template static.
tcp: Trivial fix to correct function name in a comment in net/ipv4/tcp.c
[NET]: Expose netdevice dev_id through sysfs
skbuff: fix missing kernel-doc notation
[ROSE]: Fix soft lockup wrt. rose_node_list_lock
PNP_MAX_IRQ is 2
If a device invokes pnpacpi_parse_allocated_irqresource() 0, 1, or 2 times, we are happy.
The 3rd time, we will fail and print "pnpacpi: exceeded the max number of IRQ resources: 2"
The 4th and subsequent calls (if this ever happened) would silently scribble on
irq_resource[2], which doesn't actualy exist.
Found-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This patch fixes problem in Makefile that prevented
built-in compilation of iwlcore
Commit that caused this problem: eadd3c4b ("iwlwifi: make Makefile
more concise")
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Yi Zhu <yi.zhu@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
After the removal of the Solaris binary emulation the exports of
move_addr_to_{kernel,user} are no longer used.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
