From: Shi Weihua <[EMAIL PROTECTED]>
This patch removes some redundant code in the function setup_sigcontext().
The registers ar.ccv,b7,r14,ar.csd,ar.ssd,r2-r3 and r16-r31 are not
restored in restore_sigcontext() when (flags & IA64_SC_FLAG_IN_SYSCALL) is
true. So we don't need to zero those variables in setup_sigcontext().
Signed-off-by: Shi Weihua <[EMAIL PROTECTED]>
Cc: "Luck, Tony" <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
arch/ia64/kernel/signal.c | 10 +---------
1 file changed, 1 insertion(+), 9 deletions(-)
diff -puN
arch/ia64/kernel/signal.c~ia64-signal-remove-redundant-code-in-setup_sigcontext
arch/ia64/kernel/signal.c
---
a/arch/ia64/kernel/signal.c~ia64-signal-remove-redundant-code-in-setup_sigcontext
+++ a/arch/ia64/kernel/signal.c
@@ -280,15 +280,7 @@ setup_sigcontext (struct sigcontext __us
err |= __copy_to_user(&sc->sc_gr[15], &scr->pt.r15, 8); /* r15
*/
err |= __put_user(scr->pt.cr_iip + ia64_psr(&scr->pt)->ri, &sc->sc_ip);
- if (flags & IA64_SC_FLAG_IN_SYSCALL) {
- /* Clear scratch registers if the signal interrupted a system
call. */
- err |= __put_user(0, &sc->sc_ar_ccv);
/* ar.ccv */
- err |= __put_user(0, &sc->sc_br[7]);
/* b7 */
- err |= __put_user(0, &sc->sc_gr[14]);
/* r14 */
- err |= __clear_user(&sc->sc_ar25, 2*8); /*
ar.csd & ar.ssd */
- err |= __clear_user(&sc->sc_gr[2], 2*8);
/* r2-r3 */
- err |= __clear_user(&sc->sc_gr[16], 16*8);
/* r16-r31 */
- } else {
+ if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) {
/* Copy scratch regs to sigcontext if the signal didn't
interrupt a syscall. */
err |= __put_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);
/* ar.ccv */
err |= __put_user(scr->pt.b7, &sc->sc_br[7]);
/* b7 */
_
-
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