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mm/damon/sysfs: prohibit multiple physical address space monitoring targets

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Having multiple targets for physical address space monitoring makes no
sense.  This commit prohibits such a ridiculous DAMON context setup my
making the DAMON context build function to check and return an error for
the case.

Link: https://lkml.kernel.org/r/20220429160606.127307-7-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2022-05-09 18:20:55 -07:00 • committed by Andrew Morton
parent dae0087aef
commit 0a890a9faa
1 changed files with 4 additions and 0 deletions
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4
mm/damon/sysfs.c
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@ -2125,6 +2125,10 @@ static int damon_sysfs_set_targets(struct damon_ctx *ctx,
{
int i, err;
/* Multiple physical address space monitoring targets makes no sense */
if (ctx->ops.id == DAMON_OPS_PADDR && sysfs_targets->nr > 1)
return -EINVAL;
for (i = 0; i < sysfs_targets->nr; i++) {
struct damon_sysfs_target *sys_target =
sysfs_targets->targets_arr[i];