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mm/damon/core: add damon_new_region() debug_sanity check

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damon_new_region() is supposed to be called with only valid address range
arguments.  Do the check under DAMON_DEBUG_SANITY.

Link: https://lkml.kernel.org/r/20260306152914.86303-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2026-03-06 07:29:05 -08:00 committed by Andrew Morton
parent 62f0582875
commit b0264a951c
1 changed files with 12 additions and 0 deletions
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12
mm/damon/core.c
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@ -109,6 +109,17 @@ int damon_select_ops(struct damon_ctx *ctx, enum damon_ops_id id)
return err;
}
#ifdef CONFIG_DAMON_DEBUG_SANITY
static void damon_verify_new_region(unsigned long start, unsigned long end)
{
WARN_ONCE(start >= end, "start %lu >= end %lu\n", start, end);
}
#else
static void damon_verify_new_region(unsigned long start, unsigned long end)
{
}
#endif
/*
* Construct a damon_region struct
*
@ -118,6 +129,7 @@ struct damon_region *damon_new_region(unsigned long start, unsigned long end)
{
struct damon_region *region;
damon_verify_new_region(start, end);
region = kmem_cache_alloc(damon_region_cache, GFP_KERNEL);
if (!region)
return NULL;