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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-04-24 11:18:49 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-05-07 21:12:42 +0200 |
| commit | 9f18fff63cfd6f559daa1eaae60640372c65f84b (patch) | |
| tree | b16f137dfd05c94d56c7cd75b9828bea806ced7b /arch/s390 | |
| parent | s390: move spectre sysfs attribute code (diff) | |
| download | linux-9f18fff63cfd6f559daa1eaae60640372c65f84b.tar.xz linux-9f18fff63cfd6f559daa1eaae60640372c65f84b.zip | |
s390: remove indirect branch from do_softirq_own_stack
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 <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kernel/irq.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c index 94f2099bceb0..3d17c41074ca 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 { |