[PATCH RFC 3/8] powerpc/64: Use barrier_nospec in syscall entry
From: Michal Suchanek <hidden>
Date: 2018-03-13 18:33:01
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
Signed-off-by: Michal Suchanek <redacted> --- arch/powerpc/kernel/entry_64.S | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 2cb5109a7ea3..7bfc4cf48af2 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S@@ -36,6 +36,7 @@ #include <asm/context_tracking.h> #include <asm/tm.h> #include <asm/ppc-opcode.h> +#include <asm/barrier.h> #include <asm/export.h> #ifdef CONFIG_PPC_BOOK3S #include <asm/exception-64s.h>
@@ -159,6 +160,7 @@ system_call: /* label this so stack traces look sane */ andi. r11,r10,_TIF_SYSCALL_DOTRACE bne .Lsyscall_dotrace /* does not return */ cmpldi 0,r0,NR_syscalls + barrier_nospec bge- .Lsyscall_enosys .Lsyscall:
@@ -319,6 +321,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) ld r10,TI_FLAGS(r10) cmpldi r0,NR_syscalls + barrier_nospec blt+ .Lsyscall /* Return code is already in r3 thanks to do_syscall_trace_enter() */
--
2.13.6