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atomics: Provide atomic_add_negative() variants

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atomic_add_negative() does not provide the relaxed/acquire/release
variants.

Provide them in preparation for a new scalable reference count algorithm.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20230323102800.101763813@linutronix.de
This commit is contained in:
Thomas Gleixner
2023-03-23 21:55:30 +01:00
committed by Peter Zijlstra
parent fe15c26ee2
commit e5ab9eff46
5 changed files with 309 additions and 18 deletions
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scripts/atomic/atomics.tbl
+1 -1
View File
@@ -33,7 +33,7 @@ try_cmpxchg B v p:old i:new
sub_and_test b i v
dec_and_test b v
inc_and_test b v
add_negative b i v
add_negative B i v
add_unless fb v i:a i:u
inc_not_zero b v
inc_unless_negative b v
scripts/atomic/fallbacks/add_negative
+5 -6
View File
@@ -1,16 +1,15 @@
cat <<EOF
/**
* arch_${atomic}_add_negative - add and test if negative
* arch_${atomic}_add_negative${order} - Add and test if negative
* @i: integer value to add
* @v: pointer of type ${atomic}_t
*
* Atomically adds @i to @v and returns true
* if the result is negative, or false when
* result is greater than or equal to zero.
* Atomically adds @i to @v and returns true if the result is negative,
* or false when the result is greater than or equal to zero.
*/
static __always_inline bool
arch_${atomic}_add_negative(${int} i, ${atomic}_t *v)
arch_${atomic}_add_negative${order}(${int} i, ${atomic}_t *v)
{
return arch_${atomic}_add_return(i, v) < 0;
return arch_${atomic}_add_return${order}(i, v) < 0;
}
EOF