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| author | Helge Deller <deller@gmx.de> | 2020-04-05 23:08:07 +0300 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2020-04-05 23:16:38 +0300 |
| commit | 2772f0efd5bbd5413db3d22e363b779ca0fa5310 (patch) | |
| tree | f45c9fbcc4d43af0290ab167579ab8ea6d00a409 /arch | |
| parent | 997ba6573685451c37005a5b74a4baa3c16b5231 (diff) | |
| download | linux-2772f0efd5bbd5413db3d22e363b779ca0fa5310.tar.xz | |
parisc: Improve interrupt handling in arch_spin_lock_flags()
Rewrite arch_spin_lock() and arch_spin_lock_flags() to not re-enable and
disable the PSW_SM_I interrupt flag too often.
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/parisc/include/asm/spinlock.h | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/arch/parisc/include/asm/spinlock.h b/arch/parisc/include/asm/spinlock.h index 197d2247e4db..51582eacb7ec 100644 --- a/arch/parisc/include/asm/spinlock.h +++ b/arch/parisc/include/asm/spinlock.h @@ -10,25 +10,34 @@ static inline int arch_spin_is_locked(arch_spinlock_t *x) { volatile unsigned int *a = __ldcw_align(x); + smp_mb(); return *a == 0; } -#define arch_spin_lock(lock) arch_spin_lock_flags(lock, 0) +static inline void arch_spin_lock(arch_spinlock_t *x) +{ + volatile unsigned int *a; + + a = __ldcw_align(x); + while (__ldcw(a) == 0) + while (*a == 0) + cpu_relax(); +} static inline void arch_spin_lock_flags(arch_spinlock_t *x, unsigned long flags) { volatile unsigned int *a; + unsigned long flags_dis; a = __ldcw_align(x); - while (__ldcw(a) == 0) + while (__ldcw(a) == 0) { + local_save_flags(flags_dis); + local_irq_restore(flags); while (*a == 0) - if (flags & PSW_SM_I) { - local_irq_enable(); - cpu_relax(); - local_irq_disable(); - } else - cpu_relax(); + cpu_relax(); + local_irq_restore(flags_dis); + } } #define arch_spin_lock_flags arch_spin_lock_flags |