mm: factor out can_spin_trylock()

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Deduplicate checks for whether the current context is safe for
spin_trylock().

Does this function really belong in mm/internal.h or is it generic?  Not
sure.  If someone ends up duplicating this logic elsewhere in the kernel,
that would be a shame.  But if it goes in some generic header, someone
treats it as documentation about where it's guaranteed safe to
spin_trylock(), and then it emerges that there are other subtle
preconditions that didn't affect the mm usecase, that would be worse.  So,
just be conservative and keep it local.

Link: https://lore.kernel.org/20260703-alloc-trylock-v5-18-c87b714e19d3@google.com
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Suggested-by: Harry Yoo <harry@kernel.org>
Link: https://lore.kernel.org/all/397859cb-b127-4cc6-9c71-044afc99bf0c@kernel.org/
Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Reviewed-by: Harry Yoo (Oracle) <harry@kernel.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

This commit is contained in:

Brendan Jackman 2026-07-03 12:31:58 +00:00 • committed by Andrew Morton

parent 5df11ba0eb

commit 3a01af8281

3 changed files with 25 additions and 25 deletions

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23

mm/internal.h

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17

mm/page_alloc.c

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10

mm/slub.c

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