summaryrefslogtreecommitdiff
path: root/arch/mips/kernel
diff options
context:
space:
mode:
authorPaul Burton <paul.burton@mips.com>2019-10-01 21:53:39 +0000
committerPaul Burton <paul.burton@mips.com>2019-10-07 09:43:05 -0700
commite84957e6ae043bb83ad6ae7e949a1ce97b6bbfef (patch)
tree362a1ddeb8bf9224c737e9c5f21284595a9abaf8 /arch/mips/kernel
parent3c1d3f0979721a39dd2980c97466127ce65aa130 (diff)
MIPS: syscall: Emit Loongson3 sync workarounds within asm
Generate the sync instructions required to workaround Loongson3 LL/SC errata within inline asm blocks, which feels a little safer than doing it from C where strictly speaking the compiler would be well within its rights to insert a memory access between the separate asm statements we previously had, containing sync & ll instructions respectively. 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/kernel')
-rw-r--r--arch/mips/kernel/syscall.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c
index 3f16f3823031..c333e5788664 100644
--- a/arch/mips/kernel/syscall.c
+++ b/arch/mips/kernel/syscall.c
@@ -37,6 +37,7 @@
#include <asm/signal.h>
#include <asm/sim.h>
#include <asm/shmparam.h>
+#include <asm/sync.h>
#include <asm/sysmips.h>
#include <asm/switch_to.h>
@@ -133,12 +134,12 @@ static inline int mips_atomic_set(unsigned long addr, unsigned long new)
[efault] "i" (-EFAULT)
: "memory");
} else if (cpu_has_llsc) {
- loongson_llsc_mb();
__asm__ __volatile__ (
" .set push \n"
" .set "MIPS_ISA_ARCH_LEVEL" \n"
" li %[err], 0 \n"
"1: \n"
+ " " __SYNC(full, loongson3_war) " \n"
user_ll("%[old]", "(%[addr])")
" move %[tmp], %[new] \n"
"2: \n"