Merge tag 'v3.10.56' into update

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm64 / kernel / sys_compat.c

diff --git a/arch/arm64/kernel/sys_compat.c b/arch/arm64/kernel/sys_compat.c
index de2b0226e06df34fd7aaa4bb55e014fc33f9cddf..dc47e53e9e28c15da99e62976a9ca29f71da8bc4 100644 (file)
--- a/arch/arm64/kernel/sys_compat.c
+++ b/arch/arm64/kernel/sys_compat.c
@@ -79,6 +79,12 @@ long compat_arm_syscall(struct pt_regs *regs)
 
        case __ARM_NR_compat_set_tls:
                current->thread.tp_value = regs->regs[0];
+
+               /*
+                * Protect against register corruption from context switch.
+                * See comment in tls_thread_flush.
+                */
+               barrier();
                asm ("msr tpidrro_el0, %0" : : "r" (regs->regs[0]));
                return 0;