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docs: proc: document ProtectionKey in smaps

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The ProtectionKey entry was added in v4.9; back then it was x86-specific,
but it now lives in generic code and applies to all architectures
supporting pkeys (currently x86, power, arm64).

Time to document it: add a paragraph to proc.rst about the ProtectionKey
entry.

[akpm@linux-foundation.org: s/system/hardware/, per review discussion]
[akpm@linux-foundation.org: s/hardware/CPU/]
Link: https://lore.kernel.org/20260407125133.564182-1-kevin.brodsky@arm.com
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Reported-by: Yury Khrustalev <yury.khrustalev@arm.com>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kevin Brodsky 2026-04-07 13:51:33 +01:00 committed by Andrew Morton
parent 89e613bc0b
commit 9a8ea3c1cb
1 changed files with 4 additions and 0 deletions
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Documentation/filesystems/proc.rst
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@ -549,6 +549,10 @@ does not take into account swapped out page of underlying shmem objects.
naturally aligned THP pages of any currently enabled size. 1 if true, 0
otherwise.
If both the kernel and the CPU support protection keys (pkeys),
"ProtectionKey" indicates the memory protection key associated with the
virtual memory area.
"VmFlags" field deserves a separate description. This member represents the
kernel flags associated with the particular virtual memory area in two letter
encoded manner. The codes are the following: