slab: Warn on duplicate cache names when DEBUG_VM=y

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Duplicate slab cache names can create havoc for userspace tooling that
expects slab cache names to be unique [1]. This is a reasonable
expectation.

Sadly, too many duplicate name problems are out there in the wild, so
simply warn instead of pr_err() + failing the sanity check.

[ vbabka@suse.cz: change to WARN_ON(), see the discussion at [2] ]

Link: https://lore.kernel.org/linux-fsdevel/2d1d053da1cafb3e7940c4f25952da4f0af34e38.1722293276.git.osandov@fb.com/ [1]
Link: https://lore.kernel.org/all/20240807090746.2146479-1-pedro.falcato@gmail.com/ [2]
Signed-off-by: Pedro Falcato <pedro.falcato@gmail.com>
Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>

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Pedro Falcato 2024-08-07 10:07:46 +01:00 • committed by Vlastimil Babka

parent 5be63fc19f

commit 4c39529663

1 changed files with 17 additions and 0 deletions

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mm/slab_common.c

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