From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. 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..0e0b9aef1 --- /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