From d9a89a26e02ef9ed03f74a755a8b4d8f3a066622 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 9 Feb 2009 22:17:40 +0900 Subject: x86: add %gs accessors for x86_32 Impact: cleanup On x86_32, %gs is handled lazily. It's not saved and restored on kernel entry/exit but only when necessary which usually is during task switch but there are few other places. Currently, it's done by calling savesegment() and loadsegment() explicitly. Define get_user_gs(), set_user_gs() and task_user_gs() and use them instead. While at it, clean up register access macros in signal.c. This cleans up code a bit and will help future changes. Signed-off-by: Tejun Heo Signed-off-by: Ingo Molnar --- arch/x86/math-emu/get_address.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'arch/x86/math-emu') diff --git a/arch/x86/math-emu/get_address.c b/arch/x86/math-emu/get_address.c index 420b3b6e3915..6ef5e99380f9 100644 --- a/arch/x86/math-emu/get_address.c +++ b/arch/x86/math-emu/get_address.c @@ -150,11 +150,9 @@ static long pm_address(u_char FPU_modrm, u_char segment, #endif /* PARANOID */ switch (segment) { - /* gs isn't used by the kernel, so it still has its - user-space value. */ case PREFIX_GS_ - 1: - /* N.B. - movl %seg, mem is a 2 byte write regardless of prefix */ - savesegment(gs, addr->selector); + /* user gs handling can be lazy, use special accessors */ + addr->selector = get_user_gs(FPU_info->regs); break; default: addr->selector = PM_REG_(segment); -- cgit v1.2.3-58-ga151