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authorJackie Liu <liuyun01@kylinos.cn>2022-05-18 10:31:05 +0300
committerakpm <akpm@linux-foundation.org>2022-05-25 20:47:48 +0300
commit83d7d04f9d2ef354858b2a8444aee38e41ec1699 (patch)
treeeb702b15f22e6d0a4f833bdbbb10e3a8df8222b4 /mm/kfence
parente5c3f619a04d9e191de66d5f8e069367f73a6487 (diff)
downloadlinux-83d7d04f9d2ef354858b2a8444aee38e41ec1699.tar.xz
mm/kfence: print disabling or re-enabling message
By printing information, we can friendly prompt the status change information of kfence by dmesg and record by syslog. Also, set kfence_enabled to false only when needed. Link: https://lkml.kernel.org/r/20220518073105.3160335-1-liu.yun@linux.dev Signed-off-by: Jackie Liu <liuyun01@kylinos.cn> Co-developed-by: Marco Elver <elver@google.com> Signed-off-by: Marco Elver <elver@google.com> Reviewed-by: Marco Elver <elver@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/kfence')
-rw-r--r--mm/kfence/core.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index 6e69986c3f0d..2b9f89749154 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -69,8 +69,11 @@ static int param_set_sample_interval(const char *val, const struct kernel_param
if (ret < 0)
return ret;
- if (!num) /* Using 0 to indicate KFENCE is disabled. */
+ /* Using 0 to indicate KFENCE is disabled. */
+ if (!num && READ_ONCE(kfence_enabled)) {
+ pr_info("disabled\n");
WRITE_ONCE(kfence_enabled, false);
+ }
*((unsigned long *)kp->arg) = num;
@@ -898,6 +901,7 @@ static int kfence_enable_late(void)
WRITE_ONCE(kfence_enabled, true);
queue_delayed_work(system_unbound_wq, &kfence_timer, 0);
+ pr_info("re-enabled\n");
return 0;
}