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| author | Jackie Liu <liuyun01@kylinos.cn> | 2022-05-18 15:31:05 +0800 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-05-25 10:47:48 -0700 |
| commit | 83d7d04f9d2ef354858b2a8444aee38e41ec1699 (patch) | |
| tree | eb702b15f22e6d0a4f833bdbbb10e3a8df8222b4 /mm/kfence | |
| parent | e5c3f619a04d9e191de66d5f8e069367f73a6487 (diff) | |
| download | lwn-83d7d04f9d2ef354858b2a8444aee38e41ec1699.tar.gz lwn-83d7d04f9d2ef354858b2a8444aee38e41ec1699.zip | |
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.c | 6 |
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; } |