diff options
| author | Andi Kleen <ak@linux.intel.com> | 2017-11-17 15:27:06 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-17 16:10:01 -0800 |
| commit | aaf5dcfb223617ac2d16113e4b500199c65689de (patch) | |
| tree | 708dbc2baef2f18cfb368b2e785642f6a4ece283 /kernel/panic.c | |
| parent | b1fca27d384e8418aac84b39f6f5179aecc1b64f (diff) | |
| download | lwn-aaf5dcfb223617ac2d16113e4b500199c65689de.tar.gz lwn-aaf5dcfb223617ac2d16113e4b500199c65689de.zip | |
kernel debug: support resetting WARN_ONCE for all architectures
Some architectures store the WARN_ONCE state in the flags field of the
bug_entry. Clear that one too when resetting once state through
/sys/kernel/debug/clear_warn_once
Pointed out by Michael Ellerman
Improves the earlier patch that add clear_warn_once.
[ak@linux.intel.com: add a missing ifdef CONFIG_MODULES]
Link: http://lkml.kernel.org/r/20171020170633.9593-1-andi@firstfloor.org
[akpm@linux-foundation.org: fix unused var warning]
[akpm@linux-foundation.org: Use 0200 for clear_warn_once file, per mpe]
[akpm@linux-foundation.org: clear BUGFLAG_DONE in clear_once_table(), per mpe]
Link: http://lkml.kernel.org/r/20171019204642.7404-1-andi@firstfloor.org
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Tested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/panic.c')
| -rw-r--r-- | kernel/panic.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/panic.c b/kernel/panic.c index 672a91dc20fe..67cebf2a3b67 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -595,6 +595,7 @@ EXPORT_SYMBOL(warn_slowpath_null); static int clear_warn_once_set(void *data, u64 val) { + generic_bug_clear_once(); memset(__start_once, 0, __end_once - __start_once); return 0; } @@ -607,7 +608,7 @@ DEFINE_SIMPLE_ATTRIBUTE(clear_warn_once_fops, static __init int register_warn_debugfs(void) { /* Don't care about failure */ - debugfs_create_file("clear_warn_once", 0644, NULL, + debugfs_create_file("clear_warn_once", 0200, NULL, NULL, &clear_warn_once_fops); return 0; } |