文件操作 - fetch_add_unless
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文件: /usr/src/linux-headers-5.15.0-186/scripts/atomic/fallbacks/fetch_add_unless
编辑文件内容
cat << EOF /** * arch_${atomic}_fetch_add_unless - add unless the number is already a given value * @v: pointer of type ${atomic}_t * @a: the amount to add to v... * @u: ...unless v is equal to u. * * Atomically adds @a to @v, so long as @v was not already @u. * Returns original value of @v */ static __always_inline ${int} arch_${atomic}_fetch_add_unless(${atomic}_t *v, ${int} a, ${int} u) { ${int} c = arch_${atomic}_read(v); do { if (unlikely(c == u)) break; } while (!arch_${atomic}_try_cmpxchg(v, &c, c + a)); return c; } EOF
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