mirror of
https://github.com/torvalds/linux.git
synced 2024-12-28 05:41:55 +00:00
1d78814d41
Currently each ordering variant has several potential definitions,
with a mixture of preprocessor and C definitions, including several
copies of its C prototype, e.g.
| #if defined(arch_atomic_fetch_andnot_acquire)
| #define raw_atomic_fetch_andnot_acquire arch_atomic_fetch_andnot_acquire
| #elif defined(arch_atomic_fetch_andnot_relaxed)
| static __always_inline int
| raw_atomic_fetch_andnot_acquire(int i, atomic_t *v)
| {
| int ret = arch_atomic_fetch_andnot_relaxed(i, v);
| __atomic_acquire_fence();
| return ret;
| }
| #elif defined(arch_atomic_fetch_andnot)
| #define raw_atomic_fetch_andnot_acquire arch_atomic_fetch_andnot
| #else
| static __always_inline int
| raw_atomic_fetch_andnot_acquire(int i, atomic_t *v)
| {
| return raw_atomic_fetch_and_acquire(~i, v);
| }
| #endif
Make this a bit simpler by defining the C prototype once, and writing
the various potential definitions as plain C code guarded by ifdeffery.
For example, the above becomes:
| static __always_inline int
| raw_atomic_fetch_andnot_acquire(int i, atomic_t *v)
| {
| #if defined(arch_atomic_fetch_andnot_acquire)
| return arch_atomic_fetch_andnot_acquire(i, v);
| #elif defined(arch_atomic_fetch_andnot_relaxed)
| int ret = arch_atomic_fetch_andnot_relaxed(i, v);
| __atomic_acquire_fence();
| return ret;
| #elif defined(arch_atomic_fetch_andnot)
| return arch_atomic_fetch_andnot(i, v);
| #else
| return raw_atomic_fetch_and_acquire(~i, v);
| #endif
| }
Which is far easier to read. 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.
At the same time, the fallbacks for raw_atomic*_xhcg() are made to use
'new' rather than 'i' as the name of the new value. This is what the
existing fallback template used, and is more consistent with the
raw_atomic{_try,}cmpxchg() fallbacks.
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/20230605070124.3741859-24-mark.rutland@arm.com
332 lines
8.2 KiB
Bash
Executable File
332 lines
8.2 KiB
Bash
Executable File
#!/bin/sh
|
|
# SPDX-License-Identifier: GPL-2.0
|
|
|
|
ATOMICDIR=$(dirname $0)
|
|
|
|
. ${ATOMICDIR}/atomic-tbl.sh
|
|
|
|
#gen_template_fallback(template, meta, pfx, name, sfx, order, atomic, int, args...)
|
|
gen_template_fallback()
|
|
{
|
|
local template="$1"; shift
|
|
local meta="$1"; shift
|
|
local pfx="$1"; shift
|
|
local name="$1"; shift
|
|
local sfx="$1"; shift
|
|
local order="$1"; shift
|
|
local atomic="$1"; shift
|
|
local int="$1"; shift
|
|
|
|
local ret="$(gen_ret_type "${meta}" "${int}")"
|
|
local retstmt="$(gen_ret_stmt "${meta}")"
|
|
local params="$(gen_params "${int}" "${atomic}" "$@")"
|
|
local args="$(gen_args "$@")"
|
|
|
|
. ${template}
|
|
}
|
|
|
|
#gen_order_fallback(meta, pfx, name, sfx, order, atomic, int, args...)
|
|
gen_order_fallback()
|
|
{
|
|
local meta="$1"; shift
|
|
local pfx="$1"; shift
|
|
local name="$1"; shift
|
|
local sfx="$1"; shift
|
|
local order="$1"; shift
|
|
|
|
local tmpl_order=${order#_}
|
|
local tmpl="${ATOMICDIR}/fallbacks/${tmpl_order:-fence}"
|
|
gen_template_fallback "${tmpl}" "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "$@"
|
|
}
|
|
|
|
#gen_proto_fallback(meta, pfx, name, sfx, order, atomic, int, args...)
|
|
gen_proto_fallback()
|
|
{
|
|
local meta="$1"; shift
|
|
local pfx="$1"; shift
|
|
local name="$1"; shift
|
|
local sfx="$1"; shift
|
|
local order="$1"; shift
|
|
|
|
local tmpl="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
|
|
gen_template_fallback "${tmpl}" "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "$@"
|
|
}
|
|
|
|
#gen_proto_order_variant(meta, pfx, name, sfx, order, atomic, int, args...)
|
|
gen_proto_order_variant()
|
|
{
|
|
local meta="$1"; shift
|
|
local pfx="$1"; shift
|
|
local name="$1"; shift
|
|
local sfx="$1"; shift
|
|
local order="$1"; shift
|
|
local atomic="$1"; shift
|
|
local int="$1"; shift
|
|
|
|
local atomicname="${atomic}_${pfx}${name}${sfx}${order}"
|
|
local basename="${atomic}_${pfx}${name}${sfx}"
|
|
|
|
local template="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
|
|
|
|
local ret="$(gen_ret_type "${meta}" "${int}")"
|
|
local retstmt="$(gen_ret_stmt "${meta}")"
|
|
local params="$(gen_params "${int}" "${atomic}" "$@")"
|
|
local args="$(gen_args "$@")"
|
|
|
|
printf "static __always_inline ${ret}\n"
|
|
printf "raw_${atomicname}(${params})\n"
|
|
printf "{\n"
|
|
|
|
# Where there is no possible fallback, this order variant is mandatory
|
|
# and must be provided by arch code. Add a comment to the header to
|
|
# make this obvious.
|
|
#
|
|
# Ideally we'd error on a missing definition, but arch code might
|
|
# define this order variant as a C function without a preprocessor
|
|
# symbol.
|
|
if [ -z ${template} ] && [ -z "${order}" ] && ! meta_has_relaxed "${meta}"; then
|
|
printf "\t${retstmt}arch_${atomicname}(${args});\n"
|
|
printf "}\n\n"
|
|
return
|
|
fi
|
|
|
|
printf "#if defined(arch_${atomicname})\n"
|
|
printf "\t${retstmt}arch_${atomicname}(${args});\n"
|
|
|
|
# Allow FULL/ACQUIRE/RELEASE ops to be defined in terms of RELAXED ops
|
|
if [ "${order}" != "_relaxed" ] && meta_has_relaxed "${meta}"; then
|
|
printf "#elif defined(arch_${basename}_relaxed)\n"
|
|
gen_order_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "${atomic}" "${int}" "$@"
|
|
fi
|
|
|
|
# Allow ACQUIRE/RELEASE/RELAXED ops to be defined in terms of FULL ops
|
|
if [ ! -z "${order}" ]; then
|
|
printf "#elif defined(arch_${basename})\n"
|
|
printf "\t${retstmt}arch_${basename}(${args});\n"
|
|
fi
|
|
|
|
printf "#else\n"
|
|
if [ ! -z "${template}" ]; then
|
|
gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "${atomic}" "${int}" "$@"
|
|
else
|
|
printf "#error \"Unable to define raw_${atomicname}\"\n"
|
|
fi
|
|
|
|
printf "#endif\n"
|
|
printf "}\n\n"
|
|
}
|
|
|
|
|
|
#gen_proto_order_variants(meta, pfx, name, sfx, atomic, int, args...)
|
|
gen_proto_order_variants()
|
|
{
|
|
local meta="$1"; shift
|
|
local pfx="$1"; shift
|
|
local name="$1"; shift
|
|
local sfx="$1"; shift
|
|
local atomic="$1"
|
|
|
|
gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
|
|
|
|
if meta_has_acquire "${meta}"; then
|
|
gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
|
|
fi
|
|
|
|
if meta_has_release "${meta}"; then
|
|
gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
|
|
fi
|
|
|
|
if meta_has_relaxed "${meta}"; then
|
|
gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_relaxed" "$@"
|
|
fi
|
|
}
|
|
|
|
#gen_basic_fallbacks(basename)
|
|
gen_basic_fallbacks()
|
|
{
|
|
local basename="$1"; shift
|
|
cat << EOF
|
|
#define raw_${basename}_acquire arch_${basename}
|
|
#define raw_${basename}_release arch_${basename}
|
|
#define raw_${basename}_relaxed arch_${basename}
|
|
EOF
|
|
}
|
|
|
|
gen_order_fallbacks()
|
|
{
|
|
local xchg="$1"; shift
|
|
|
|
cat <<EOF
|
|
|
|
#define raw_${xchg}_relaxed arch_${xchg}_relaxed
|
|
|
|
#ifdef arch_${xchg}_acquire
|
|
#define raw_${xchg}_acquire arch_${xchg}_acquire
|
|
#else
|
|
#define raw_${xchg}_acquire(...) \\
|
|
__atomic_op_acquire(arch_${xchg}, __VA_ARGS__)
|
|
#endif
|
|
|
|
#ifdef arch_${xchg}_release
|
|
#define raw_${xchg}_release arch_${xchg}_release
|
|
#else
|
|
#define raw_${xchg}_release(...) \\
|
|
__atomic_op_release(arch_${xchg}, __VA_ARGS__)
|
|
#endif
|
|
|
|
#ifdef arch_${xchg}
|
|
#define raw_${xchg} arch_${xchg}
|
|
#else
|
|
#define raw_${xchg}(...) \\
|
|
__atomic_op_fence(arch_${xchg}, __VA_ARGS__)
|
|
#endif
|
|
|
|
EOF
|
|
}
|
|
|
|
gen_xchg_order_fallback()
|
|
{
|
|
local xchg="$1"; shift
|
|
local order="$1"; shift
|
|
local forder="${order:-_fence}"
|
|
|
|
printf "#if defined(arch_${xchg}${order})\n"
|
|
printf "#define raw_${xchg}${order} arch_${xchg}${order}\n"
|
|
|
|
if [ "${order}" != "_relaxed" ]; then
|
|
printf "#elif defined(arch_${xchg}_relaxed)\n"
|
|
printf "#define raw_${xchg}${order}(...) \\\\\n"
|
|
printf " __atomic_op${forder}(arch_${xchg}, __VA_ARGS__)\n"
|
|
fi
|
|
|
|
if [ ! -z "${order}" ]; then
|
|
printf "#elif defined(arch_${xchg})\n"
|
|
printf "#define raw_${xchg}${order} arch_${xchg}\n"
|
|
fi
|
|
|
|
printf "#else\n"
|
|
printf "extern void raw_${xchg}${order}_not_implemented(void);\n"
|
|
printf "#define raw_${xchg}${order}(...) raw_${xchg}${order}_not_implemented()\n"
|
|
printf "#endif\n\n"
|
|
}
|
|
|
|
gen_xchg_fallbacks()
|
|
{
|
|
local xchg="$1"; shift
|
|
|
|
for order in "" "_acquire" "_release" "_relaxed"; do
|
|
gen_xchg_order_fallback "${xchg}" "${order}"
|
|
done
|
|
}
|
|
|
|
gen_try_cmpxchg_fallback()
|
|
{
|
|
local cmpxchg="$1"; shift;
|
|
local order="$1"; shift;
|
|
|
|
cat <<EOF
|
|
#define raw_try_${cmpxchg}${order}(_ptr, _oldp, _new) \\
|
|
({ \\
|
|
typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \\
|
|
___r = raw_${cmpxchg}${order}((_ptr), ___o, (_new)); \\
|
|
if (unlikely(___r != ___o)) \\
|
|
*___op = ___r; \\
|
|
likely(___r == ___o); \\
|
|
})
|
|
EOF
|
|
}
|
|
|
|
gen_try_cmpxchg_order_fallback()
|
|
{
|
|
local cmpxchg="$1"; shift
|
|
local order="$1"; shift
|
|
local forder="${order:-_fence}"
|
|
|
|
printf "#if defined(arch_try_${cmpxchg}${order})\n"
|
|
printf "#define raw_try_${cmpxchg}${order} arch_try_${cmpxchg}${order}\n"
|
|
|
|
if [ "${order}" != "_relaxed" ]; then
|
|
printf "#elif defined(arch_try_${cmpxchg}_relaxed)\n"
|
|
printf "#define raw_try_${cmpxchg}${order}(...) \\\\\n"
|
|
printf " __atomic_op${forder}(arch_try_${cmpxchg}, __VA_ARGS__)\n"
|
|
fi
|
|
|
|
if [ ! -z "${order}" ]; then
|
|
printf "#elif defined(arch_try_${cmpxchg})\n"
|
|
printf "#define raw_try_${cmpxchg}${order} arch_try_${cmpxchg}\n"
|
|
fi
|
|
|
|
printf "#else\n"
|
|
gen_try_cmpxchg_fallback "${cmpxchg}" "${order}"
|
|
printf "#endif\n\n"
|
|
}
|
|
|
|
gen_try_cmpxchg_fallbacks()
|
|
{
|
|
local cmpxchg="$1"; shift;
|
|
|
|
for order in "" "_acquire" "_release" "_relaxed"; do
|
|
gen_try_cmpxchg_order_fallback "${cmpxchg}" "${order}"
|
|
done
|
|
}
|
|
|
|
gen_cmpxchg_local_fallbacks()
|
|
{
|
|
local cmpxchg="$1"; shift
|
|
|
|
printf "#define raw_${cmpxchg} arch_${cmpxchg}\n\n"
|
|
printf "#ifdef arch_try_${cmpxchg}\n"
|
|
printf "#define raw_try_${cmpxchg} arch_try_${cmpxchg}\n"
|
|
printf "#else\n"
|
|
gen_try_cmpxchg_fallback "${cmpxchg}" ""
|
|
printf "#endif\n\n"
|
|
}
|
|
|
|
cat << EOF
|
|
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
// Generated by $0
|
|
// DO NOT MODIFY THIS FILE DIRECTLY
|
|
|
|
#ifndef _LINUX_ATOMIC_FALLBACK_H
|
|
#define _LINUX_ATOMIC_FALLBACK_H
|
|
|
|
#include <linux/compiler.h>
|
|
|
|
EOF
|
|
|
|
for xchg in "xchg" "cmpxchg" "cmpxchg64" "cmpxchg128"; do
|
|
gen_xchg_fallbacks "${xchg}"
|
|
done
|
|
|
|
for cmpxchg in "cmpxchg" "cmpxchg64" "cmpxchg128"; do
|
|
gen_try_cmpxchg_fallbacks "${cmpxchg}"
|
|
done
|
|
|
|
for cmpxchg in "cmpxchg_local" "cmpxchg64_local" "cmpxchg128_local"; do
|
|
gen_cmpxchg_local_fallbacks "${cmpxchg}" ""
|
|
done
|
|
|
|
for cmpxchg in "sync_cmpxchg"; do
|
|
printf "#define raw_${cmpxchg} arch_${cmpxchg}\n\n"
|
|
done
|
|
|
|
grep '^[a-z]' "$1" | while read name meta args; do
|
|
gen_proto "${meta}" "${name}" "atomic" "int" ${args}
|
|
done
|
|
|
|
cat <<EOF
|
|
#ifdef CONFIG_GENERIC_ATOMIC64
|
|
#include <asm-generic/atomic64.h>
|
|
#endif
|
|
|
|
EOF
|
|
|
|
grep '^[a-z]' "$1" | while read name meta args; do
|
|
gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
|
|
done
|
|
|
|
cat <<EOF
|
|
#endif /* _LINUX_ATOMIC_FALLBACK_H */
|
|
EOF
|