From: Shi Weihua Date: Thu, 13 Dec 2007 23:58:26 +0000 (-0800) Subject: [IA64] signal: remove redundant code in setup_sigcontext() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2018df76d276bb4fe97b175bd5db0cdd128dfeb4;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [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 Signed-off-by: Andrew Morton Signed-off-by: Tony Luck --- diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c index 4c730099d58f..309da3567bc8 100644 --- a/arch/ia64/kernel/signal.c +++ b/arch/ia64/kernel/signal.c @@ -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 */