linux-stable.git/Documentation/vm, branch v5.10.78

mm/debug_vm_pgtable/basic: add validation for dirtiness after write protect

2021-07-14T14:56:13+00:00

[ Upstream commit bb5c47ced46797409f4791d0380db3116d93134c ]

Patch series "mm/debug_vm_pgtable: Some minor updates", v3.

This series contains some cleanups and new test suggestions from Catalin
from an earlier discussion.

https://lore.kernel.org/linux-mm/20201123142237.GF17833@gaia/

This patch (of 2):

This adds validation tests for dirtiness after write protect conversion
for each page table level.  There are two new separate test types involved
here.

The first test ensures that a given page table entry does not become dirty
after pxx_wrprotect().  This is important for platforms like arm64 which
transfers and drops the hardware dirty bit (!PTE_RDONLY) to the software
dirty bit while making it an write protected one.  This test ensures that
no fresh page table entry could be created with hardware dirty bit set.
The second test ensures that a given page table entry always preserve the
dirty information across pxx_wrprotect().

This adds two previously missing PUD level basic tests and while here
fixes pxx_wrprotect() related typos in the documentation file.

Link: https://lkml.kernel.org/r/1611137241-26220-1-git-send-email-anshuman.khandual@arm.com
Link: https://lkml.kernel.org/r/1611137241-26220-2-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual 
Suggested-by: Catalin Marinas 
Tested-by: Gerald Schaefer  [s390]
Cc: Christophe Leroy 
Cc: Gerald Schaefer 
Cc: Vineet Gupta 
Cc: Paul Walmsley 
Cc: Steven Price 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Sasha Levin

mm/slub: clarify verification reporting

2021-06-23T12:42:53+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

Merge tag 'docs-5.10-2' of git://git.lwn.net/linux

2020-10-24T00:13:53+00:00

Pull documentation fixes from Jonathan Corbet:
 "A handful of late-arriving documentation fixes"

* tag 'docs-5.10-2' of git://git.lwn.net/linux:
  docs: Add two missing entries in vm sysctl index
  docs/vm: trivial fixes to several spelling mistakes
  docs: submitting-patches: describe preserving review/test tags
  Documentation: Chinese translation of Documentation/arm64/hugetlbpage.rst
  Documentation: x86: fix a missing word in x86_64/mm.rst.
  docs: driver-api: remove a duplicated index entry
  docs: lkdtm: Modernize and improve details
  docs: deprecated.rst: Expand str*cpy() replacement notes
  docs/cpu-load: format the example code.

docs/vm: trivial fixes to several spelling mistakes

2020-10-22T22:11:04+00:00

Fix several spelling mistakes in vm documentation.

Signed-off-by: Colin Ian King 
Link: https://lore.kernel.org/r/20201022142653.254429-1-colin.king@canonical.com
Signed-off-by: Jonathan Corbet

mm/doc: fix a literal block markup

2020-10-16T05:28:20+00:00

Literal blocks with :: markup should be indented, as otherwise
Sphinx complains:

	Documentation/vm/hmm.rst:363: WARNING: Literal block expected; none found.

Fixes: f7ebd9ed7767 ("mm/doc: add usage description for migrate_vma_*()")
Signed-off-by: Mauro Carvalho Chehab

docs: get rid of :c:type explicit declarations for structs

2020-10-15T05:49:40+00:00

The :c:type:`foo` only works properly with structs before
Sphinx 3.x.

On Sphinx 3.x, structs should now be declared using the
.. c:struct, and referenced via :c:struct tag.

As we now have the automarkup.py macro, that automatically
convert:
	struct foo

into cross-references, let's get rid of that, solving
several warnings when building docs with Sphinx 3.x.

Reviewed-by: André Almeida  # blk-mq.rst
Reviewed-by: Takashi Iwai  # sound
Reviewed-by: Mike Rapoport 
Reviewed-by: Greg Kroah-Hartman 
Signed-off-by: Mauro Carvalho Chehab

docs/vm: fix 'mm_count' vs 'mm_users' counter confusion

2020-10-14T01:38:32+00:00

In the context of the anonymous address space lifespan description the
'mm_users' reference counter is confused with 'mm_count'.  I.e a "zombie"
mm gets released when "mm_count" becomes zero, not "mm_users".

Signed-off-by: Alexander Gordeev 
Signed-off-by: Andrew Morton 
Cc: Jonathan Corbet 
Link: https://lkml.kernel.org/r/1597040695-32633-1-git-send-email-agordeev@linux.ibm.com
Signed-off-by: Linus Torvalds

mm/doc: add usage description for migrate_vma_*()

2020-09-16T18:19:51+00:00

The migrate_vma_setup(), migrate_vma_pages(), and migrate_vma_finalize()
API usage by device drivers is not well documented.
Add a description for how device drivers are expected to use it.

Signed-off-by: Ralph Campbell 
Reviewed-by: Alistair Popple 
Link: https://lore.kernel.org/r/20200909212956.20104-1-rcampbell@nvidia.com
Signed-off-by: Jonathan Corbet

docs: add some new files to their respective index.rst files

2020-09-10T16:48:20+00:00

There were some new file additions for Kernel 5.7 and 5.8
that weren't added at the corresponding index file.

Signed-off-by: Mauro Carvalho Chehab 
Link: https://lore.kernel.org/r/9fd4d04f0d122ff38b5342a0098d99cc2f546652.1599660067.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet

mm/doc: editorial pass on page migration

2020-09-09T17:39:46+00:00

Add Sphinx reference links to HMM and CPUSETS, and numerous small
editorial changes to make the page_migration.rst document more readable.

Signed-off-by: Ralph Campbell 
Reviewed-by: Randy Dunlap 
Link: https://lore.kernel.org/r/20200902225247.15213-1-rcampbell@nvidia.com
Signed-off-by: Jonathan Corbet