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authorNathan Chancellor <natechancellor@gmail.com>2020-04-21 14:47:04 -0700
committerHerbert Xu <herbert@gondor.apana.org.au>2020-04-30 15:19:33 +1000
commit18f1ca46858eac22437819937ae44aa9a8f9f2fa (patch)
tree9d017c457cfe1c64ecad44d59b3375fa1142a9bb /lib/mpi
parent97f9ac3db6612f14ac0c509e1a63ce14fd4cc0eb (diff)
downloadlinux-18f1ca46858eac22437819937ae44aa9a8f9f2fa.tar.bz2
lib/mpi: Fix 64-bit MIPS build with Clang
When building 64r6_defconfig with CONFIG_MIPS32_O32 disabled and CONFIG_CRYPTO_RSA enabled: lib/mpi/generic_mpih-mul1.c:37:24: error: invalid use of a cast in a inline asm context requiring an l-value: remove the cast or build with -fheinous-gnu-extensions umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb); ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ lib/mpi/longlong.h:664:22: note: expanded from macro 'umul_ppmm' : "=d" ((UDItype)(w0)) ~~~~~~~~~~^~~ lib/mpi/generic_mpih-mul1.c:37:13: error: invalid use of a cast in a inline asm context requiring an l-value: remove the cast or build with -fheinous-gnu-extensions umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb); ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ lib/mpi/longlong.h:668:22: note: expanded from macro 'umul_ppmm' : "=d" ((UDItype)(w1)) ~~~~~~~~~~^~~ 2 errors generated. This special case for umul_ppmm for MIPS64r6 was added in commit bbc25bee37d2b ("lib/mpi: Fix umul_ppmm() for MIPS64r6"), due to GCC being inefficient and emitting a __multi3 intrinsic. There is no such issue with clang; with this patch applied, I can build this configuration without any problems and there are no link errors like mentioned in the commit above (which I can still reproduce with GCC 9.3.0 when that commit is reverted). Only use this definition when GCC is being used. This really should have been caught by commit b0c091ae04f67 ("lib/mpi: Eliminate unused umul_ppmm definitions for MIPS") when I was messing around in this area but I was not testing 64-bit MIPS at the time. Link: https://github.com/ClangBuiltLinux/linux/issues/885 Reported-by: Dmitry Golovin <dima@golovin.in> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'lib/mpi')
-rw-r--r--lib/mpi/longlong.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/mpi/longlong.h b/lib/mpi/longlong.h
index 2dceaca27489..bfff2e398ffe 100644
--- a/lib/mpi/longlong.h
+++ b/lib/mpi/longlong.h
@@ -653,7 +653,7 @@ do { \
************** MIPS/64 **************
***************************************/
#if (defined(__mips) && __mips >= 3) && W_TYPE_SIZE == 64
-#if defined(__mips_isa_rev) && __mips_isa_rev >= 6
+#if defined(__mips_isa_rev) && __mips_isa_rev >= 6 && defined(CONFIG_CC_IS_GCC)
/*
* GCC ends up emitting a __multi3 intrinsic call for MIPS64r6 with the plain C
* code below, so we special case MIPS64r6 until the compiler can do better.