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locking/atomic: add arch_atomic_long*()

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Now that all architectures provide arch_{atomic,atomic64}_*(), we can
build arch_atomic_long_*() atop these, which can be safely used in
noinstr code. The regular atomic_long_*() wrappers are built atop these,
as we do for {atomic,atomic64}_*() atop arch_{atomic,atomic64}_*().

We don't provide arch_* versions of the cond_read*() variants, as we
don't have arch_* versions of the underlying atomic/atomic64 functions
(nor the smp_cond_load*() helpers these are typically based on).

Note that the headers in this patch under include/linux/atomic/ are
generated by the scripts in scripts/atomic/.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210713105253.7615-5-mark.rutland@arm.com
This commit is contained in:
Mark Rutland
2021-07-13 11:52:52 +01:00
committed by Peter Zijlstra
parent e3d18cee25
commit 67d1b0de25
5 changed files with 916 additions and 333 deletions
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5
scripts/atomic/gen-atomic-instrumented.sh
View File

@@ -138,6 +138,11 @@ grep '^[a-z]' "$1" | while read name meta args; do
gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
done
grep '^[a-z]' "$1" | while read name meta args; do
gen_proto "${meta}" "${name}" "atomic_long" "long" ${args}
done
for xchg in "xchg" "cmpxchg" "cmpxchg64" "try_cmpxchg"; do
for order in "" "_acquire" "_release" "_relaxed"; do
gen_xchg "${xchg}${order}" ""

4
scripts/atomic/gen-atomic-long.sh
View File

@@ -47,9 +47,9 @@ gen_proto_order_variant()
cat <<EOF
static __always_inline ${ret}
atomic_long_${name}(${params})
arch_atomic_long_${name}(${params})
{
${retstmt}${atomic}_${name}(${argscast});
${retstmt}arch_${atomic}_${name}(${argscast});
}
EOF