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[IA64] signal: remove redundant code in setup_sigcontext() 

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 <shiwh@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Shi Weihua 2007-12-13 15:58:26 -08:00 committed by Tony Luck
parent a3ebdb6c42
commit 2018df76d2
1 changed files with 1 additions and 9 deletions
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10
arch/ia64/kernel/signal.c
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@ -280,15 +280,7 @@ setup_sigcontext (struct sigcontext __user *sc, sigset_t *mask, struct sigscratc
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 */