path: root/kernel
diff options
authorAndi Kleen <ak@linux.intel.com>2017-11-17 15:27:06 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-17 16:10:01 -0800
commitaaf5dcfb223617ac2d16113e4b500199c65689de (patch)
tree708dbc2baef2f18cfb368b2e785642f6a4ece283 /kernel
parentb1fca27d384e8418aac84b39f6f5179aecc1b64f (diff)
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')
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;

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