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x86: signal: use 16 bytes boundary for rt_sigframe 

Impact: cleanup

Supporting xsave/xrestore introduces 64 bytes boundary for save_i387_xstate().
16 bytes boundary is OK for rt_sigframe.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Hiroshi Shimamoto 2009-02-27 10:29:09 -08:00 committed by Ingo Molnar
parent 97286a2b64
commit 36a4526583
1 changed files with 2 additions and 4 deletions
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6
arch/x86/kernel/signal.c
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@ -409,15 +409,13 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
if (used_math()) { if (used_math()) {
sp -= sig_xstate_size; sp -= sig_xstate_size;
*fpstate = (void __user *)round_down(sp, 64); *fpstate = (void __user *)round_down(sp, 64);
if (save_i387_xstate(*fpstate) < 0) if (save_i387_xstate(*fpstate) < 0)
return (void __user *) -1L; return (void __user *) -1L;
sp -= frame_size;
return (void __user *)round_down(sp, 16) - 8;
} }
sp -= frame_size; sp -= frame_size;
return (void __user *)round_down(sp, 64) - 8; return (void __user *)round_down(sp, 16) - 8;
} }
static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,