crypto: arm,arm64 - Fix random regeneration of S_shipped

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>

diff --git a/arch/arm/crypto/Makefile b/arch/arm/crypto/Makefile
index a758107c552573583677b87c4a3cb751c3239498..3304e671918d66f6308580eb51bc2cc07647ad94 100644 (file)
--- a/arch/arm/crypto/Makefile
+++ b/arch/arm/crypto/Makefile
@@ -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

diff --git a/arch/arm64/crypto/Makefile b/arch/arm64/crypto/Makefile
index 318346a0c1dd6c179de5ceb6deef1f266af57668..8df9f326f4495bf4c5f98f762073e7faf4a574b8 100644 (file)
--- a/arch/arm64/crypto/Makefile
+++ b/arch/arm64/crypto/Makefile
@@ -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