Suren Baghdasaryan 1bda80a7be mm: convert mm_lock_seq to a proper seqcount ...

[ Upstream commit eb449bd969 ]

Convert mm_lock_seq to be seqcount_t and change all mmap_write_lock
variants to increment it, in-line with the usual seqcount usage pattern.
This lets us check whether the mmap_lock is write-locked by checking
mm_lock_seq.sequence counter (odd=locked, even=unlocked). This will be
used when implementing mmap_lock speculation functions.
As a result vm_lock_seq is also change to be unsigned to match the type
of mm_lock_seq.sequence.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Link: https://lkml.kernel.org/r/20241122174416.1367052-2-surenb@google.com
Stable-dep-of: 52f657e34d ("x86: shadow stacks: proper error handling for mmap lock")
Signed-off-by: Sasha Levin <sashal@kernel.org>

2026-05-14 15:29:17 +02:00

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linux

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.gitignore

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Makefile

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vma_internal.h

mm: convert mm_lock_seq to a proper seqcount

2026-05-14 15:29:17 +02:00

vma.c

mm: convert mm_lock_seq to a proper seqcount

2026-05-14 15:29:17 +02:00