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authorPaul Burton <paul.burton@mips.com>2019-10-02 00:53:44 +0300
committerPaul Burton <paul.burton@mips.com>2019-10-07 19:43:13 +0300
commite4acfbc18fc9e0d75ad15a652864b3971892e423 (patch)
tree6b6024d6dbbedd60e17018adc13e7bbeae0127e4 /arch/mips/Makefile
parent4dee90d7b5796692e8da78c7b64cf42d5e4c1b09 (diff)
downloadlinux-e4acfbc18fc9e0d75ad15a652864b3971892e423.tar.xz
MIPS: Check Loongson3 LL/SC errata workaround correctness
When Loongson3 LL/SC errata workarounds are enabled (ie. CONFIG_CPU_LOONGSON3_WORKAROUNDS=y) run a tool to scan through the compiled kernel & ensure that the workaround is applied correctly. That is, ensure that: - Every LL or LLD instruction is preceded by a sync instruction. - Any branches from within an LL/SC loop to outside of that loop target a sync instruction. Reasoning for these conditions can be found by reading the comment above the definition of __SYNC_loongson3_war in arch/mips/include/asm/sync.h. This tool will help ensure that we don't inadvertently introduce code paths that miss the required workarounds. Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: linux-mips@vger.kernel.org Cc: Huacai Chen <chenhc@lemote.com> Cc: Jiaxun Yang <jiaxun.yang@flygoat.com> Cc: linux-kernel@vger.kernel.org
Diffstat (limited to 'arch/mips/Makefile')
-rw-r--r--arch/mips/Makefile3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index cdc09b71febe..0a5eab626260 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -14,6 +14,9 @@
archscripts: scripts_basic
$(Q)$(MAKE) $(build)=arch/mips/tools elf-entry
+ifeq ($(CONFIG_CPU_LOONGSON3_WORKAROUNDS),y)
+ $(Q)$(MAKE) $(build)=arch/mips/tools loongson3-llsc-check
+endif
$(Q)$(MAKE) $(build)=arch/mips/boot/tools relocs
KBUILD_DEFCONFIG := 32r2el_defconfig