linux-stable.git/Documentation/vm, branch v4.19.201

mm/slub: clarify verification reporting

2021-06-30T12:48:26+00:00

commit 8669dbab2ae56085c128894b181c2aa50f97e368 upstream.

Patch series "Actually fix freelist pointer vs redzoning", v4.

This fixes redzoning vs the freelist pointer (both for middle-position
and very small caches).  Both are "theoretical" fixes, in that I see no
evidence of such small-sized caches actually be used in the kernel, but
that's no reason to let the bugs continue to exist, especially since
people doing local development keep tripping over it.  :)

This patch (of 3):

Instead of repeating "Redzone" and "Poison", clarify which sides of
those zones got tripped.  Additionally fix column alignment in the
trailer.

Before:

  BUG test (Tainted: G    B            ): Redzone overwritten
  ...
  Redzone (____ptrval____): bb bb bb bb bb bb bb bb      ........
  Object (____ptrval____): f6 f4 a5 40 1d e8            ...@..
  Redzone (____ptrval____): 1a aa                        ..
  Padding (____ptrval____): 00 00 00 00 00 00 00 00      ........

After:

  BUG test (Tainted: G    B            ): Right Redzone overwritten
  ...
  Redzone  (____ptrval____): bb bb bb bb bb bb bb bb      ........
  Object   (____ptrval____): f6 f4 a5 40 1d e8            ...@..
  Redzone  (____ptrval____): 1a aa                        ..
  Padding  (____ptrval____): 00 00 00 00 00 00 00 00      ........

The earlier commits that slowly resulted in the "Before" reporting were:

  d86bd1bece6f ("mm/slub: support left redzone")
  ffc79d288000 ("slub: use print_hex_dump")
  2492268472e7 ("SLUB: change error reporting format to follow lockdep loosely")

Link: https://lkml.kernel.org/r/20210608183955.280836-1-keescook@chromium.org
Link: https://lkml.kernel.org/r/20210608183955.280836-2-keescook@chromium.org
Link: https://lore.kernel.org/lkml/cfdb11d7-fb8e-e578-c939-f7f5fb69a6bd@suse.cz/
Signed-off-by: Kees Cook 
Acked-by: Vlastimil Babka 
Cc: Marco Elver 
Cc: "Lin, Zhenpeng" 
Cc: Christoph Lameter 
Cc: Pekka Enberg 
Cc: David Rientjes 
Cc: Joonsoo Kim 
Cc: Roman Gushchin 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

docs/vm: move ksm and transhuge from "user" to "internals" section.

2018-05-29T12:45:55+00:00

After the userspace interface description for KSM and THP was split to
Documentation/admin-guide/mm, the remaining parts belong to the section
describing MM internals.

Signed-off-by: Mike Rapoport 
Signed-off-by: Jonathan Corbet

docs/vm: transhuge: split userspace bits to admin-guide/mm/transhuge

2018-05-21T15:30:58+00:00

Now that the administrative information for transparent huge pages is
nicely separated, move it to its own page under the admin guide.

Signed-off-by: Mike Rapoport 
Signed-off-by: Jonathan Corbet

docs/vm: transhuge: minor updates

2018-05-21T15:30:51+00:00

Some formatting changes and addition of a sentence introducing khugepaged

Signed-off-by: Mike Rapoport 
Signed-off-by: Jonathan Corbet

docs/vm: transhuge: change sections order

2018-05-21T15:30:44+00:00

so that userspace interface and implementation description will be grouped
together

Signed-off-by: Mike Rapoport 
Signed-off-by: Jonathan Corbet

mm, THP, doc: Add document for thp_swpout/thp_swpout_fallback

2018-05-10T21:42:42+00:00

Add document for newly added thp_swpout, thp_swpout_fallback fields in
/proc/vmstat.

Signed-off-by: "Huang, Ying" 
Cc: "Kirill A. Shutemov" 
Cc: Andrea Arcangeli 
Cc: Johannes Weiner 
Signed-off-by: Jonathan Corbet

docs/vm: move numa_memory_policy.rst to Documentation/admin-guide/mm

2018-05-08T15:31:31+00:00

The document describes userspace API and as such it belongs to
Documentation/admin-guide/mm

Signed-off-by: Mike Rapoport 
Signed-off-by: Jonathan Corbet

docs/vm: numa_memory_policy: s/Linux memory policy/NUMA memory policy/

2018-05-08T15:31:27+00:00

The document describes NUMA memory policy and as it is a part of the Linux
documentation it's obvious that this is Linux memory policy. Besides,
"Linux memory policy" may refer to other policies, e.g. memory hotplug
policy, and using term NUMA makes the documentation less ambiguous.

Signed-off-by: Mike Rapoport 
Signed-off-by: Jonathan Corbet

docs/vm: numa_memory_policy: formatting and spelling updates

2018-05-08T15:31:20+00:00

Signed-off-by: Mike Rapoport 
Signed-off-by: Jonathan Corbet

docs/vm: ksm: split userspace interface to admin-guide/mm/ksm.rst

2018-04-27T23:19:49+00:00

Signed-off-by: Mike Rapoport 
Signed-off-by: Jonathan Corbet