From: Martin Schwidefsky Date: Tue, 24 Apr 2018 09:18:49 +0000 (+0200) Subject: s390: remove indirect branch from do_softirq_own_stack X-Git-Tag: v4.14.43~65 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a6565fdd90cbe63e60bf8edc447992bf47f4791c;p=platform%2Fkernel%2Flinux-exynos.git s390: remove indirect branch from do_softirq_own_stack commit 9f18fff63cfd6f559daa1eaae60640372c65f84b upstream. The inline assembly to call __do_softirq on the irq stack uses an indirect branch. This can be replaced with a normal relative branch. Cc: stable@vger.kernel.org # 4.16 Fixes: f19fbd5ed6 ("s390: introduce execute-trampolines for branches") Reviewed-by: Hendrik Brueckner Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c index 94f2099..3d17c41 100644 --- a/arch/s390/kernel/irq.c +++ b/arch/s390/kernel/irq.c @@ -176,10 +176,9 @@ void do_softirq_own_stack(void) new -= STACK_FRAME_OVERHEAD; ((struct stack_frame *) new)->back_chain = old; asm volatile(" la 15,0(%0)\n" - " basr 14,%2\n" + " brasl 14,__do_softirq\n" " la 15,0(%1)\n" - : : "a" (new), "a" (old), - "a" (__do_softirq) + : : "a" (new), "a" (old) : "0", "1", "2", "3", "4", "5", "14", "cc", "memory" ); } else {