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x86/entry, bug: Comment the instrumentation_begin() usage for WARN()

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Explain the rationale for annotating WARN(), even though, strictly
speaking printk() and friends are very much not safe in many of the
places we put them.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
This commit is contained in:
Peter Zijlstra 2020-06-04 11:17:40 +02:00
parent 6b643a07a7
commit 8e8bb06d19
1 changed files with 6 additions and 0 deletions
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6
arch/x86/include/asm/bug.h
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@ -75,6 +75,12 @@ do { \
unreachable(); \ unreachable(); \
} while (0) } while (0)
/*
* This instrumentation_begin() is strictly speaking incorrect; but it
* suppresses the complaints from WARN()s in noinstr code. If such a WARN()
* were to trigger, we'd rather wreck the machine in an attempt to get the
* message out than not know about it.
*/
#define __WARN_FLAGS(flags) \ #define __WARN_FLAGS(flags) \
do { \ do { \
instrumentation_begin(); \ instrumentation_begin(); \