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crypto: arm,arm64 - Fix random regeneration of S_shipped

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The decision to rebuild .S_shipped is made based on the relative
timestamps of .S_shipped and .pl files but git makes this essentially
random. This means that the perl script might run anyway (usually at
most once per checkout), defeating the whole purpose of _shipped.

Fix by skipping the rule unless explicit make variables are provided:
REGENERATE_ARM_CRYPTO or REGENERATE_ARM64_CRYPTO.

This can produce nasty occasional build failures downstream, for example
for toolchains with broken perl. The solution is minimally intrusive to
make it easier to push into stable.

Another report on a similar issue here: https://lkml.org/lkml/2018/3/8/1379

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Cc: <stable@vger.kernel.org>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Leonard Crestez 2018-03-13 22:17:23 +02:00 committed by Herbert Xu
parent eb428ee0e3
commit 6aaf49b495
2 changed files with 4 additions and 0 deletions
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2
arch/arm/crypto/Makefile
View File

@ -56,6 +56,7 @@ crc32-arm-ce-y:= crc32-ce-core.o crc32-ce-glue.o
chacha20-neon-y := chacha20-neon-core.o chacha20-neon-glue.o
speck-neon-y := speck-neon-core.o speck-neon-glue.o
ifdef REGENERATE_ARM_CRYPTO
quiet_cmd_perl = PERL $@
cmd_perl = $(PERL) $(<) > $(@)
@ -64,5 +65,6 @@ $(src)/sha256-core.S_shipped: $(src)/sha256-armv4.pl
$(src)/sha512-core.S_shipped: $(src)/sha512-armv4.pl
$(call cmd,perl)
endif
.PRECIOUS: $(obj)/sha256-core.S $(obj)/sha512-core.S

2
arch/arm64/crypto/Makefile
View File

@ -67,6 +67,7 @@ CFLAGS_aes-glue-ce.o := -DUSE_V8_CRYPTO_EXTENSIONS
$(obj)/aes-glue-%.o: $(src)/aes-glue.c FORCE
$(call if_changed_rule,cc_o_c)
ifdef REGENERATE_ARM64_CRYPTO
quiet_cmd_perlasm = PERLASM $@
cmd_perlasm = $(PERL) $(<) void $(@)
@ -75,5 +76,6 @@ $(src)/sha256-core.S_shipped: $(src)/sha512-armv8.pl
$(src)/sha512-core.S_shipped: $(src)/sha512-armv8.pl
$(call cmd,perlasm)
endif
.PRECIOUS: $(obj)/sha256-core.S $(obj)/sha512-core.S