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locking/atomic: scripts: simplify raw_atomic_long*() definitions

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Currently, atomic-long is split into two sections, one defining the
raw_atomic_long_*() ops for CONFIG_64BIT, and one defining the raw
atomic_long_*() ops for !CONFIG_64BIT.

With many lines elided, this looks like:

| #ifdef CONFIG_64BIT
| ...
| static __always_inline bool
| raw_atomic_long_try_cmpxchg(atomic_long_t *v, long *old, long new)
| {
|         return raw_atomic64_try_cmpxchg(v, (s64 *)old, new);
| }
| ...
| #else /* CONFIG_64BIT */
| ...
| static __always_inline bool
| raw_atomic_long_try_cmpxchg(atomic_long_t *v, long *old, long new)
| {
|         return raw_atomic_try_cmpxchg(v, (int *)old, new);
| }
| ...
| #endif

The two definitions are spread far apart in the file, and duplicate the
prototype, making it hard to have a legible set of kerneldoc comments.

Make this simpler by defining the C prototype once, and writing the two
definitions inline. For example, the above becomes:

| static __always_inline bool
| raw_atomic_long_try_cmpxchg(atomic_long_t *v, long *old, long new)
| {
| #ifdef CONFIG_64BIT
|         return raw_atomic64_try_cmpxchg(v, (s64 *)old, new);
| #else
|         return raw_atomic_try_cmpxchg(v, (int *)old, new);
| #endif
| }

As we now always have a single copy of the C prototype wrapping all the
potential definitions, we now have an obvious single location for kerneldoc
comments. As a bonus, both the script and the generated file are
somewhat shorter.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230605070124.3741859-23-mark.rutland@arm.com
This commit is contained in:
Mark Rutland 2023-06-05 08:01:19 +01:00 • committed by Peter Zijlstra
parent b916a8c765
commit 630399469f
2 changed files with 351 additions and 535 deletions
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859
include/linux/atomic/atomic-long.h
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File diff suppressed because it is too large Load diff

27
scripts/atomic/gen-atomic-long.sh
View file

@ -32,7 +32,7 @@ gen_args_cast()
done
}
#gen_proto_order_variant(meta, pfx, name, sfx, order, atomic, int, arg...)
#gen_proto_order_variant(meta, pfx, name, sfx, order, arg...)
gen_proto_order_variant()
{
local meta="$1"; shift
@ -40,21 +40,24 @@ gen_proto_order_variant()
local name="$1"; shift
local sfx="$1"; shift
local order="$1"; shift
local atomic="$1"; shift
local int="$1"; shift
local atomicname="${pfx}${name}${sfx}${order}"
local ret="$(gen_ret_type "${meta}" "long")"
local params="$(gen_params "long" "atomic_long" "$@")"
local argscast="$(gen_args_cast "${int}" "${atomic}" "$@")"
local argscast_32="$(gen_args_cast "int" "atomic" "$@")"
local argscast_64="$(gen_args_cast "s64" "atomic64" "$@")"
local retstmt="$(gen_ret_stmt "${meta}")"
cat <<EOF
static __always_inline ${ret}
raw_atomic_long_${atomicname}(${params})
{
${retstmt}raw_${atomic}_${atomicname}(${argscast});
#ifdef CONFIG_64BIT
${retstmt}raw_atomic64_${atomicname}(${argscast_64});
#else
${retstmt}raw_atomic_${atomicname}(${argscast_32});
#endif
}
EOF
@ -84,24 +87,12 @@ typedef atomic_t atomic_long_t;
#define atomic_long_cond_read_relaxed atomic_cond_read_relaxed
#endif
#ifdef CONFIG_64BIT
EOF
grep '^[a-z]' "$1" | while read name meta args; do
gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
gen_proto "${meta}" "${name}" ${args}
done
cat <<EOF
#else /* CONFIG_64BIT */
EOF
grep '^[a-z]' "$1" | while read name meta args; do
gen_proto "${meta}" "${name}" "atomic" "int" ${args}
done
cat <<EOF
#endif /* CONFIG_64BIT */
#endif /* _LINUX_ATOMIC_LONG_H */
EOF