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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152/* SPDX-License-Identifier: GPL-2.0 */#ifndef __LINUX_COOKIE_H#define __LINUX_COOKIE_H
#include <linux/atomic.h>#include <linux/percpu.h>#include <asm/local.h>
struct pcpu_gen_cookie { local_t nesting; u64 last;} __aligned(16);
struct gen_cookie { struct pcpu_gen_cookie __percpu *local; atomic64_t forward_last ____cacheline_aligned_in_smp; atomic64_t reverse_last;};
#define COOKIE_LOCAL_BATCH 4096
#define DEFINE_COOKIE(name) \ static DEFINE_PER_CPU(struct pcpu_gen_cookie, __##name); \ static struct gen_cookie name = { \ .local = &__##name, \ .forward_last = ATOMIC64_INIT(0), \ .reverse_last = ATOMIC64_INIT(0), \ }
static __always_inline u64 gen_cookie_next(struct gen_cookie *gc){ struct pcpu_gen_cookie *local = this_cpu_ptr(gc->local); u64 val;
if (likely(local_inc_return(&local->nesting) == 1)) { val = local->last; if (__is_defined(CONFIG_SMP) && unlikely((val & (COOKIE_LOCAL_BATCH - 1)) == 0)) { s64 next = atomic64_add_return(COOKIE_LOCAL_BATCH, &gc->forward_last); val = next - COOKIE_LOCAL_BATCH; } local->last = ++val; } else { val = atomic64_dec_return(&gc->reverse_last); } local_dec(&local->nesting); return val;}
#endif /* __LINUX_COOKIE_H */