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| author | Vasily Gorbik <gor@linux.vnet.ibm.com> | 2017-10-12 14:01:47 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-10-18 15:11:33 +0300 |
| commit | f554be42fd0fd8dd14680c67f2db26b3e7de9670 (patch) | |
| tree | 68d1e054f9a40bbe29d3d5b3c2ef79437d6e71ee /arch/s390/lib | |
| parent | 686140a1a9c41d85a4212a1c26d671139b76404b (diff) | |
| download | linux-f554be42fd0fd8dd14680c67f2db26b3e7de9670.tar.xz | |
s390/spinlock: use cpu alternatives to enable niai instruction
Enable niai instruction in the spinlock code at run-time for machines
on which facility 49 is available (zEC12 and newer).
Signed-off-by: Vasily Gorbik <gor@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/lib')
| -rw-r--r-- | arch/s390/lib/spinlock.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c index 43b0d46c3786..920503174252 100644 --- a/arch/s390/lib/spinlock.c +++ b/arch/s390/lib/spinlock.c @@ -12,6 +12,7 @@ #include <linux/init.h> #include <linux/smp.h> #include <linux/percpu.h> +#include <asm/alternative.h> #include <asm/io.h> int spin_retry = -1; @@ -73,9 +74,7 @@ static inline int arch_load_niai4(int *lock) int owner; asm volatile( -#ifdef CONFIG_HAVE_MARCH_ZEC12_FEATURES - " .long 0xb2fa0040\n" /* NIAI 4 */ -#endif + ALTERNATIVE("", ".long 0xb2fa0040", 49) /* NIAI 4 */ " l %0,%1\n" : "=d" (owner) : "Q" (*lock) : "memory"); return owner; @@ -86,9 +85,7 @@ static inline int arch_cmpxchg_niai8(int *lock, int old, int new) int expected = old; asm volatile( -#ifdef CONFIG_HAVE_MARCH_ZEC12_FEATURES - " .long 0xb2fa0080\n" /* NIAI 8 */ -#endif + ALTERNATIVE("", ".long 0xb2fa0080", 49) /* NIAI 8 */ " cs %0,%3,%1\n" : "=d" (old), "=Q" (*lock) : "0" (old), "d" (new), "Q" (*lock) |