Patch "crypto: arm,arm64 - Fix random regeneration of S_shipped" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

crypto: arm,arm64 - Fix random regeneration of S_shipped

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
crypto-arm-arm64-fix-random-regeneration-of-s_shipped.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Leonard Crestez <[email protected]>
Date: Tue, 13 Mar 2018 22:17:23 +0200
Subject: crypto: arm,arm64 - Fix random regeneration of S_shipped

From: Leonard Crestez <[email protected]>

commit 6aaf49b495b446ff6eec0ac983f781ca0dc56a73 upstream.

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

---
 arch/arm/crypto/Makefile   |    2 ++
 arch/arm64/crypto/Makefile |    2 ++
 2 files changed, 4 insertions(+)

@@ -54,6 +54,7 @@ crct10dif-arm-ce-y	:= crct10dif-ce-core.
 crc32-arm-ce-y:= crc32-ce-core.o crc32-ce-glue.o
 chacha20-neon-y := chacha20-neon-core.o chacha20-neon-glue.o
 
+ifdef REGENERATE_ARM_CRYPTO
 quiet_cmd_perl = PERL    $@
       cmd_perl = $(PERL) $(<) > $(@)
 

@@ -62,5 +63,6 @@ $(src)/sha256-core.S_shipped: $(src)/sha
 
 $(src)/sha512-core.S_shipped: $(src)/sha512-armv4.pl
 	$(call cmd,perl)
+endif
 
 .PRECIOUS: $(obj)/sha256-core.S $(obj)/sha512-core.S

@@ -58,6 +58,7 @@ CFLAGS_aes-glue-ce.o	:= -DUSE_V8_CRYPTO_
 $(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 $(@)
 

@@ -66,5 +67,6 @@ $(src)/sha256-core.S_shipped: $(src)/sha
 
 $(src)/sha512-core.S_shipped: $(src)/sha512-armv8.pl
 	$(call cmd,perlasm)
+endif
 
 .PRECIOUS: $(obj)/sha256-core.S $(obj)/sha512-core.S

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/crypto-arm-arm64-fix-random-regeneration-of-s_shipped.patch