luck/tmp_suning_uos_patched
1
0
Fork 1
Code Issues Pull Requests Packages Projects Releases Wiki Activity
933,152 Commits 7 Branches 0 Tags 1.9 GiB
C 98%
Assembly 1.1%
Shell 0.3%
Makefile 0.3%
Python 0.1%
Other 0.1%
d7670879c5
Go to file
Waiman Long d7670879c5 mm, slab: fix sign conversion problem in memcg_uncharge_slab() 
It was found that running the LTP test on a PowerPC system could produce
erroneous values in /proc/meminfo, like:

  MemTotal:       531915072 kB
  MemFree:        507962176 kB
  MemAvailable:   1100020596352 kB

Using bisection, the problem is tracked down to commit 9c315e4d7d ("mm:
memcg/slab: cache page number in memcg_(un)charge_slab()").

In memcg_uncharge_slab() with a "int order" argument:

  unsigned int nr_pages = 1 << order;
    :
  mod_lruvec_state(lruvec, cache_vmstat_idx(s), -nr_pages);

The mod_lruvec_state() function will eventually call the
__mod_zone_page_state() which accepts a long argument.  Depending on the
compiler and how inlining is done, "-nr_pages" may be treated as a
negative number or a very large positive number.  Apparently, it was
treated as a large positive number in that PowerPC system leading to
incorrect stat counts.  This problem hasn't been seen in x86-64 yet,
perhaps the gcc compiler there has some slight difference in behavior.

It is fixed by making nr_pages a signed value.  For consistency, a similar
change is applied to memcg_charge_slab() as well.

Link: http://lkml.kernel.org/r/20200620184719.10994-1-longman@redhat.com
Fixes: 9c315e4d7d ("mm: memcg/slab: cache page number in memcg_(un)charge_slab()").
Signed-off-by: Waiman Long <longman@redhat.com>
Acked-by: Roman Gushchin <guro@fb.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: Shakeel Butt <shakeelb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-26 00:27:37 -07:00
arch openrisc: fix boot oops when DEBUG_VM is enabled 2020-06-26 00:27:36 -07:00
block block-5.8-2020-06-19 2020-06-19 13:11:26 -07:00
certs .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
crypto crypto: drbg - always try to free Jitter RNG instance 2020-06-15 17:38:54 +10:00
Documentation spi: Fixes for v5.8 2020-06-22 09:49:59 -07:00
drivers virtio: fixes, tests 2020-06-24 14:26:28 -07:00
fs ocfs2: fix value of OCFS2_INVALID_SLOT 2020-06-26 00:27:37 -07:00
include sound fixes for 5.8-rc3 2020-06-25 09:15:24 -07:00
init Kbuild updates for v5.8 (2nd) 2020-06-13 13:29:16 -07:00
ipc mmap locking API: use coccinelle to convert mmap_sem rwsem call sites 2020-06-09 09:39:14 -07:00
kernel kexec: do not verify the signature without the lockdown or mandatory signature 2020-06-26 00:27:36 -07:00
lib lib: fix test_hmm.c reference after free 2020-06-26 00:27:37 -07:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm mm, slab: fix sign conversion problem in memcg_uncharge_slab() 2020-06-26 00:27:37 -07:00
net An important follow-up for replica reads support that went into -rc1 2020-06-19 12:25:04 -07:00
samples Kbuild fixes for v5.8 2020-06-21 12:44:52 -07:00
scripts Kbuild fixes for v5.8 2020-06-21 12:44:52 -07:00
security selinux/stable-5.8 PR 20200621 2020-06-21 15:41:24 -07:00
sound sound fixes for 5.8-rc3 2020-06-25 09:15:24 -07:00
tools virtio: fixes, tests 2020-06-24 14:26:28 -07:00
usr bpfilter: match bit size of bpfilter_umh to that of the kernel 2020-05-17 18:52:01 +09:00
virt MIPS: 2020-06-12 11:05:52 -07:00
.clang-format block: add bio_for_each_bvec_all() 2020-05-25 11:25:24 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore modpost: generate vmlinux.symvers and reuse it for the second modpost 2020-06-06 23:38:12 +09:00
.mailmap A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS mailmap: change email for Ricardo Ribalda 2020-05-25 18:59:59 -06:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2020-06-20 19:18:27 -07:00
Makefile Linux 5.8-rc2 2020-06-21 15:45:29 -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.