Commit 0a890a9f authored by SeongJae Park's avatar SeongJae Park Committed by Andrew Morton
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mm/damon/sysfs: prohibit multiple physical address space monitoring targets 

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: default avatarSeongJae Park <sj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent dae0087a

mm/damon/sysfs.c

+4 −0
Original line number Diff line number Diff line
@@ -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];