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kernel debug: support resetting WARN_ONCE for all architectures

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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>
This commit is contained in:
Andi Kleen
2017-11-17 15:27:06 -08:00
committed by Linus Torvalds
parent b1fca27d38
commit aaf5dcfb22
3 changed files with 30 additions and 1 deletions
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3
kernel/panic.c
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@ -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;
}