forked from mirrors/linux
0cf264b313
We currently check the atomic headers at build-time to ensure they haven't been modified directly, and these checks require regenerating the headers in full. As this takes a few seconds, even when parallelized, this is too slow to run for every kernel build. Instead, we can generate a hash of each header as we generate them, which we can cheaply check at build time (~0.16s for all headers). This patch does so, updating headers with their hashes using the new gen-atomics.sh script. As some users apparently build the kernel wihout coreutils, lacking sha1sum, the checks are skipped in this case. Presumably, most developers have a working coreutils installation. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: anders.roxell@linaro.org Cc: linux-kernel@vger.kernel.rg Cc: naresh.kamboju@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
33 lines
730 B
Bash
Executable file
33 lines
730 B
Bash
Executable file
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# Check if atomic headers are up-to-date
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ATOMICDIR=$(dirname $0)
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ATOMICTBL=${ATOMICDIR}/atomics.tbl
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LINUXDIR=${ATOMICDIR}/../..
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echo '' | sha1sum - > /dev/null 2>&1
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if [ $? -ne 0 ]; then
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printf "sha1sum not available, skipping atomic header checks.\n"
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exit 0
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fi
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cat <<EOF |
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asm-generic/atomic-instrumented.h
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asm-generic/atomic-long.h
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linux/atomic-fallback.h
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EOF
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while read header; do
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OLDSUM="$(tail -n 1 ${LINUXDIR}/include/${header})"
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OLDSUM="${OLDSUM#// }"
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NEWSUM="$(head -n -1 ${LINUXDIR}/include/${header} | sha1sum)"
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NEWSUM="${NEWSUM%% *}"
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if [ "${OLDSUM}" != "${NEWSUM}" ]; then
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printf "warning: generated include/${header} has been modified.\n"
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fi
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done
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exit 0
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