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| author |   John David Anglin <dave.anglin@bell.net> | 2020-10-02 21:21:41 +0200 |
|---|---|---|
| committer |   Helge Deller <deller@gmx.de> | 2020-10-15 08:10:39 +0200 |
| commit | 53a42b6324b8ddce1e9d2f34da2ca68ef21c2084 (patch) | |
| tree | e56e6b487f238312f4c01b526a65aad48de475aa /arch/parisc/include/asm/futex.h | |
| parent | parisc: Mark pointers volatile in __xchg8(), __xchg32() and __xchg64() (diff) | |
| download | linux-dev-53a42b6324b8ddce1e9d2f34da2ca68ef21c2084.tar.xz linux-dev-53a42b6324b8ddce1e9d2f34da2ca68ef21c2084.zip | |
parisc: Switch to more fine grained lws locks
Increase the number of lws locks to 256 entries (instead of 16) and
choose lock entry based on bits 3-11 (instead of 4-7) of the relevant
address. With this change we archieve more fine-grained locking in
futex syscalls and thus reduce the number of possible stalls.
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/include/asm/futex.h')
| -rw-r--r-- | arch/parisc/include/asm/futex.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/parisc/include/asm/futex.h b/arch/parisc/include/asm/futex.h index c459f656c8c3..fceb9cf02fb3 100644 --- a/arch/parisc/include/asm/futex.h +++ b/arch/parisc/include/asm/futex.h @@ -16,7 +16,7 @@ static inline void _futex_spin_lock_irqsave(u32 __user *uaddr, unsigned long int *flags) { extern u32 lws_lock_start[]; - long index = ((long)uaddr & 0xf0) >> 2; + long index = ((long)uaddr & 0x3f8) >> 1; arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index]; local_irq_save(*flags); arch_spin_lock(s); @@ -26,7 +26,7 @@ static inline void _futex_spin_unlock_irqrestore(u32 __user *uaddr, unsigned long int *flags) { extern u32 lws_lock_start[]; - long index = ((long)uaddr & 0xf0) >> 2; + long index = ((long)uaddr & 0x3f8) >> 1; arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index]; arch_spin_unlock(s); local_irq_restore(*flags); |