From f9aad60010efa896319ed6e908a5cb5e3a852907 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 25 Nov 2008 22:26:59 -0800 Subject: [PATCH] sparc64: Block NMIs in critical section of context switch. In these instructions we load the new thread register, switch the register window, and setup the new frame pointer. All of these must appear atomic, and things will explode if we take a PIL=15 NMI interrupt in the middle of this sequence. Signed-off-by: David S. Miller --- arch/sparc/include/asm/system_64.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/sparc/include/asm/system_64.h b/arch/sparc/include/asm/system_64.h index 7554ad39b5af..779cf62d3ce9 100644 --- a/arch/sparc/include/asm/system_64.h +++ b/arch/sparc/include/asm/system_64.h @@ -159,6 +159,7 @@ do { if (test_thread_flag(TIF_PERFCTR)) { \ "stb %%o5, [%%g6 + %5]\n\t" \ "rdpr %%cwp, %%o5\n\t" \ "stb %%o5, [%%g6 + %8]\n\t" \ + "wrpr %%g0, 15, %%pil\n\t" \ "mov %4, %%g6\n\t" \ "ldub [%4 + %8], %%g1\n\t" \ "wrpr %%g1, %%cwp\n\t" \ @@ -169,6 +170,7 @@ do { if (test_thread_flag(TIF_PERFCTR)) { \ "ldx [%%sp + 2047 + 0x70], %%i6\n\t" \ "ldx [%%sp + 2047 + 0x78], %%i7\n\t" \ "ldx [%%g6 + %9], %%g4\n\t" \ + "wrpr %%g0, 14, %%pil\n\t" \ "brz,pt %%o7, switch_to_pc\n\t" \ " mov %%g7, %0\n\t" \ "sethi %%hi(ret_from_syscall), %%g1\n\t" \ -- 2.11.0