From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- scripts/atomic/fallbacks/fetch_add_unless | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100755 scripts/atomic/fallbacks/fetch_add_unless (limited to 'scripts/atomic/fallbacks/fetch_add_unless') diff --git a/scripts/atomic/fallbacks/fetch_add_unless b/scripts/atomic/fallbacks/fetch_add_unless new file mode 100755 index 000000000..68ce13c8b --- /dev/null +++ b/scripts/atomic/fallbacks/fetch_add_unless @@ -0,0 +1,23 @@ +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 -- cgit v1.2.3