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samples/damon/mtier: support boot time enable setup

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If 'enable' parameter of the 'mtier' DAMON sample module is set at boot
time via the kernel command line, memory allocation is tried before the
slab is initialized.  As a result kernel NULL pointer dereference BUG can
happen.  Fix it by checking the initialization status.

Link: https://lkml.kernel.org/r/20250706193207.39810-4-sj@kernel.org
Fixes: 82a08bde3c ("samples/damon: implement a DAMON module for memory tiering")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2025-07-06 12:32:04 -07:00 committed by Andrew Morton
parent 2780505ec2
commit 964314344e
1 changed files with 10 additions and 0 deletions
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10
samples/damon/mtier.c
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@ -157,6 +157,8 @@ static void damon_sample_mtier_stop(void)
damon_destroy_ctx(ctxs[1]);
}
static bool init_called;
static int damon_sample_mtier_enable_store(
const char *val, const struct kernel_param *kp)
{
@ -182,6 +184,14 @@ static int damon_sample_mtier_enable_store(
static int __init damon_sample_mtier_init(void)
{
int err = 0;
init_called = true;
if (enable) {
err = damon_sample_mtier_start();
if (err)
enable = false;
}
return 0;
}