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authorTejun Heo <tj@kernel.org>2009-02-09 22:17:40 +0900
committerIngo Molnar <mingo@elte.hu>2009-02-10 00:41:58 +0100
commitd9a89a26e02ef9ed03f74a755a8b4d8f3a066622 (patch)
tree35f3713bca4e6b815f6b9db92dc9d812ec7213ff /arch/x86/math-emu
parentf0d96110f9fd98a1a22e03b8adba69508843d910 (diff)
downloadblackbird-op-linux-d9a89a26e02ef9ed03f74a755a8b4d8f3a066622.tar.gz
blackbird-op-linux-d9a89a26e02ef9ed03f74a755a8b4d8f3a066622.zip
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 <tj@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/math-emu')
-rw-r--r--arch/x86/math-emu/get_address.c6
1 files changed, 2 insertions, 4 deletions
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);
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