The patch titled
Subject: mm/kfence: print disabling or re-enabling message
has been added to the -mm mm-unstable branch. Its filename is
mm-kfence-print-disabling-or-re-enabling-message.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-kfence-print-disabling-or-re-enabling-message.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Jackie Liu <liuyun01@xxxxxxxxxx>
Subject: mm/kfence: print disabling or re-enabling message
Date: Wed, 18 May 2022 15:31:05 +0800
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@xxxxxxxxx
Signed-off-by: Jackie Liu <liuyun01@xxxxxxxxxx>
Co-developed-by: Marco Elver <elver@xxxxxxxxxx>
Signed-off-by: Marco Elver <elver@xxxxxxxxxx>
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kfence/core.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/mm/kfence/core.c~mm-kfence-print-disabling-or-re-enabling-message
+++ a/mm/kfence/core.c
@@ -69,8 +69,11 @@ static int param_set_sample_interval(con
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;
@@ -908,6 +911,7 @@ 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;
}
_
Patches currently in -mm which might be from liuyun01@xxxxxxxxxx are
mm-kfence-print-disabling-or-re-enabling-message.patch
