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kcsan: Remove existing special atomic rules 

Remove existing special atomic rules from kcsan_is_atomic_special()
because they are no longer needed. Since we rely on the compiler
emitting instrumentation distinguishing volatile accesses, the rules
have become redundant.

Let's keep kcsan_is_atomic_special() around, so that we have an obvious
place to add special rules should the need arise in future.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
5.9.x+fslc
Marco Elver 2020-06-16 14:36:24 +02:00 committed by Paul E. McKenney
parent acfa087ccf
commit 7e766560e6
1 changed files with 2 additions and 4 deletions
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6
kernel/kcsan/atomic.h
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@ -3,8 +3,7 @@
#ifndef _KERNEL_KCSAN_ATOMIC_H
#define _KERNEL_KCSAN_ATOMIC_H
#include <linux/jiffies.h>
#include <linux/sched.h>
#include <linux/types.h>
/*
* Special rules for certain memory where concurrent conflicting accesses are
@ -13,8 +12,7 @@
*/
static bool kcsan_is_atomic_special(const volatile void *ptr)
{
/* volatile globals that have been observed in data races. */
return ptr == &jiffies || ptr == &current->state;
return false;
}
#endif /* _KERNEL_KCSAN_ATOMIC_H */