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![Peter Zijlstra](/assets/img/avatar_default.png)
Currently instrumentation of atomic primitives is done at the architecture level, while composites or fallbacks are provided at the generic level. The result is that there are no uninstrumented variants of the fallbacks. Since there is now need of such variants to isolate text poke from any form of instrumentation invert this ordering. Doing this means moving the instrumentation into the generic code as well as having (for now) two variants of the fallbacks. Notes: - the various *cond_read* primitives are not proper fallbacks and got moved into linux/atomic.c. No arch_ variants are generated because the base primitives smp_cond_load*() are instrumented. - once all architectures are moved over to arch_atomic_ one of the fallback variants can be removed and some 2300 lines reclaimed. - atomic_{read,set}*() are no longer double-instrumented Reported-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Mark Rutland <mark.rutland@arm.com> Link: https://lkml.kernel.org/r/20200505134058.769149955@linutronix.de
180 lines
4.4 KiB
Bash
Executable file
180 lines
4.4 KiB
Bash
Executable file
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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ATOMICDIR=$(dirname $0)
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ARCH=$2
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. ${ATOMICDIR}/atomic-tbl.sh
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#gen_template_fallback(template, meta, pfx, name, sfx, order, arch, atomic, int, args...)
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gen_template_fallback()
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{
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local template="$1"; shift
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local meta="$1"; shift
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local pfx="$1"; shift
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local name="$1"; shift
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local sfx="$1"; shift
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local order="$1"; shift
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local arch="$1"; shift
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local atomic="$1"; shift
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local int="$1"; shift
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local atomicname="${arch}${atomic}_${pfx}${name}${sfx}${order}"
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local ret="$(gen_ret_type "${meta}" "${int}")"
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local retstmt="$(gen_ret_stmt "${meta}")"
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local params="$(gen_params "${int}" "${atomic}" "$@")"
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local args="$(gen_args "$@")"
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if [ ! -z "${template}" ]; then
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printf "#ifndef ${atomicname}\n"
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. ${template}
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printf "#define ${atomicname} ${atomicname}\n"
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printf "#endif\n\n"
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fi
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}
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#gen_proto_fallback(meta, pfx, name, sfx, order, arch, atomic, int, args...)
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gen_proto_fallback()
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{
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local meta="$1"; shift
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local pfx="$1"; shift
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local name="$1"; shift
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local sfx="$1"; shift
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local order="$1"; shift
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local tmpl="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
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gen_template_fallback "${tmpl}" "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "$@"
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}
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#gen_basic_fallbacks(basename)
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gen_basic_fallbacks()
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{
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local basename="$1"; shift
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cat << EOF
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#define ${basename}_acquire ${basename}
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#define ${basename}_release ${basename}
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#define ${basename}_relaxed ${basename}
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EOF
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}
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#gen_proto_order_variants(meta, pfx, name, sfx, arch, atomic, int, args...)
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gen_proto_order_variants()
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{
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local meta="$1"; shift
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local pfx="$1"; shift
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local name="$1"; shift
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local sfx="$1"; shift
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local arch="$1"
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local atomic="$2"
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local basename="${arch}${atomic}_${pfx}${name}${sfx}"
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local template="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
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# If we don't have relaxed atomics, then we don't bother with ordering fallbacks
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# read_acquire and set_release need to be templated, though
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if ! meta_has_relaxed "${meta}"; then
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
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if meta_has_acquire "${meta}"; then
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
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fi
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if meta_has_release "${meta}"; then
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
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fi
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return
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fi
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printf "#ifndef ${basename}_relaxed\n"
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if [ ! -z "${template}" ]; then
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printf "#ifdef ${basename}\n"
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fi
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gen_basic_fallbacks "${basename}"
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if [ ! -z "${template}" ]; then
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printf "#endif /* ${arch}${atomic}_${pfx}${name}${sfx} */\n\n"
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_relaxed" "$@"
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fi
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printf "#else /* ${basename}_relaxed */\n\n"
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gen_template_fallback "${ATOMICDIR}/fallbacks/acquire" "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
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gen_template_fallback "${ATOMICDIR}/fallbacks/release" "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
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gen_template_fallback "${ATOMICDIR}/fallbacks/fence" "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
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printf "#endif /* ${basename}_relaxed */\n\n"
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}
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gen_xchg_fallbacks()
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{
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local xchg="$1"; shift
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cat <<EOF
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#ifndef ${xchg}_relaxed
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#define ${xchg}_relaxed ${xchg}
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#define ${xchg}_acquire ${xchg}
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#define ${xchg}_release ${xchg}
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#else /* ${xchg}_relaxed */
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#ifndef ${xchg}_acquire
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#define ${xchg}_acquire(...) \\
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__atomic_op_acquire(${xchg}, __VA_ARGS__)
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#endif
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#ifndef ${xchg}_release
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#define ${xchg}_release(...) \\
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__atomic_op_release(${xchg}, __VA_ARGS__)
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#endif
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#ifndef ${xchg}
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#define ${xchg}(...) \\
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__atomic_op_fence(${xchg}, __VA_ARGS__)
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#endif
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#endif /* ${xchg}_relaxed */
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EOF
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}
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cat << EOF
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// SPDX-License-Identifier: GPL-2.0
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// Generated by $0
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// DO NOT MODIFY THIS FILE DIRECTLY
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#ifndef _LINUX_ATOMIC_FALLBACK_H
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#define _LINUX_ATOMIC_FALLBACK_H
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#include <linux/compiler.h>
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EOF
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for xchg in "${ARCH}xchg" "${ARCH}cmpxchg" "${ARCH}cmpxchg64"; do
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gen_xchg_fallbacks "${xchg}"
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done
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grep '^[a-z]' "$1" | while read name meta args; do
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gen_proto "${meta}" "${name}" "${ARCH}" "atomic" "int" ${args}
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done
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cat <<EOF
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#ifdef CONFIG_GENERIC_ATOMIC64
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#include <asm-generic/atomic64.h>
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#endif
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EOF
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grep '^[a-z]' "$1" | while read name meta args; do
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gen_proto "${meta}" "${name}" "${ARCH}" "atomic64" "s64" ${args}
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done
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cat <<EOF
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#endif /* _LINUX_ATOMIC_FALLBACK_H */
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EOF
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