[PATCH 6/9] asm-generic/bitops/atomic.h: Rewrite using atomic_fetch_*
From: peterz@infradead.org (Peter Zijlstra)
Date: 2018-05-24 12:44:18
Also in:
lkml
On Thu, May 24, 2018 at 11:59:43AM +0100, Will Deacon wrote:
+static inline void set_bit(unsigned int nr, volatile unsigned long *p)
{
+ p += BIT_WORD(nr);
+ atomic_long_fetch_or_relaxed(BIT_MASK(nr), (atomic_long_t *)p);
}
+static inline void clear_bit(unsigned int nr, volatile unsigned long *p)
{
+ p += BIT_WORD(nr);
+ atomic_long_fetch_andnot_relaxed(BIT_MASK(nr), (atomic_long_t *)p);
}
+static inline void change_bit(unsigned int nr, volatile unsigned long *p)
{
+ p += BIT_WORD(nr);
+ atomic_long_fetch_xor_relaxed(BIT_MASK(nr), (atomic_long_t *)p);
}Why use the fetch variants here?