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Tetsuo Handa 294fc7a4c8 fs: xfs: xfs_log: Don't use KM_MAYFAIL at xfs_log_reserve(). 
When the system is close-to-OOM, fsync() may fail due to -ENOMEM because
xfs_log_reserve() is using KM_MAYFAIL. It is a bad thing to fail writeback
operation due to user-triggerable OOM condition. Since we are not using
KM_MAYFAIL at xfs_trans_alloc() before calling xfs_log_reserve(), let's
use the same flags at xfs_log_reserve().

  oom-torture: page allocation failure: order:0, mode:0x46c40(GFP_NOFS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP), nodemask=(null)
  CPU: 7 PID: 1662 Comm: oom-torture Kdump: loaded Not tainted 5.3.0-rc2+ #925
  Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00
  Call Trace:
   dump_stack+0x67/0x95
   warn_alloc+0xa9/0x140
   __alloc_pages_slowpath+0x9a8/0xbce
   __alloc_pages_nodemask+0x372/0x3b0
   alloc_slab_page+0x3a/0x8d0
   new_slab+0x330/0x420
   ___slab_alloc.constprop.94+0x879/0xb00
   __slab_alloc.isra.89.constprop.93+0x43/0x6f
   kmem_cache_alloc+0x331/0x390
   kmem_zone_alloc+0x9f/0x110 [xfs]
   kmem_zone_alloc+0x9f/0x110 [xfs]
   xlog_ticket_alloc+0x33/0xd0 [xfs]
   xfs_log_reserve+0xb4/0x410 [xfs]
   xfs_trans_reserve+0x1d1/0x2b0 [xfs]
   xfs_trans_alloc+0xc9/0x250 [xfs]
   xfs_setfilesize_trans_alloc.isra.27+0x44/0xc0 [xfs]
   xfs_submit_ioend.isra.28+0xa5/0x180 [xfs]
   xfs_vm_writepages+0x76/0xa0 [xfs]
   do_writepages+0x17/0x80
   __filemap_fdatawrite_range+0xc1/0xf0
   file_write_and_wait_range+0x53/0xa0
   xfs_file_fsync+0x87/0x290 [xfs]
   vfs_fsync_range+0x37/0x80
   do_fsync+0x38/0x60
   __x64_sys_fsync+0xf/0x20
   do_syscall_64+0x4a/0x1c0
   entry_SYSCALL_64_after_hwframe+0x49/0xbe

Fixes: eb01c9cd87 ("[XFS] Remove the xlog_ticket allocator")
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-08-03 09:36:43 -07:00
arch SPDX fixes for 5.3-rc2 2019-07-28 10:00:06 -07:00
block for-linus-20190726-2 2019-07-26 19:20:34 -07:00
certs Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs" 2019-07-10 18:43:43 -07:00
crypto USB / PHY patches for 5.3-rc1 2019-07-11 15:40:06 -07:00
Documentation USB fixes for 5.3-rc2 2019-07-28 09:52:35 -07:00
drivers Char/Misc driver fixes for 5.3-rc2 2019-07-28 10:26:10 -07:00
fs fs: xfs: xfs_log: Don't use KM_MAYFAIL at xfs_log_reserve(). 2019-08-03 09:36:43 -07:00
include TTY fixes for 5.3-rc2 2019-07-28 10:18:33 -07:00
init Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
ipc Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
kernel Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-27 21:22:33 -07:00
lib test_firmware: fix a memory leak bug 2019-07-25 14:39:52 +02:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm mm/vmalloc: Sync unmappings in __purge_vmap_area_lazy() 2019-07-22 10:18:30 +02:00
net tcp: be more careful in tcp_fragment() 2019-07-21 20:41:24 -07:00
samples treewide: remove SPDX "WITH Linux-syscall-note" from kernel-space headers again 2019-07-25 11:05:10 +02:00
scripts Kbuild fixes for v5.3 2019-07-28 10:35:04 -07:00
security meminit fix 2019-07-28 12:33:15 -07:00
sound sound fixes for 5.3-rc2 2019-07-26 10:23:45 -07:00
tools Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-27 21:17:56 -07:00
usr kbuild: enable arch/s390/include/uapi/asm/zcrypt.h for uapi header test 2019-07-23 10:45:46 +02:00
virt Documentation: move Documentation/virtual to Documentation/virt 2019-07-24 10:52:11 +02:00
.clang-format Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-17 11:26:25 -07:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes
.gitignore .gitignore: Add compilation database file 2019-07-27 12:18:19 +09:00
.mailmap MAINTAINERS: Update my email address 2019-07-22 14:57:50 +01:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS Remove references to dead website. 2019-07-19 12:22:04 -07:00
Kbuild Kbuild updates for v5.1 2019-03-10 17:48:21 -07:00
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
MAINTAINERS Char/Misc driver fixes for 5.3-rc2 2019-07-28 10:26:10 -07:00
Makefile Linux 5.3-rc2 2019-07-28 12:47:02 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.