diff options
| author |   Helge Deller <deller@gmx.de> | 2020-04-05 22:29:55 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2020-04-05 22:29:55 +0200 |
| commit | fbdc8f0f4891df7b5eb643ec0a509a4ac7dcfc2e (patch) | |
| tree | 2b9f24d527be8924201713392c8a0f235b56e032 /arch/parisc/include/asm/spinlock_types.h | |
| parent | parisc: Improve interrupt handling in arch_spin_lock_flags() (diff) | |
| download | linux-dev-fbdc8f0f4891df7b5eb643ec0a509a4ac7dcfc2e.tar.xz linux-dev-fbdc8f0f4891df7b5eb643ec0a509a4ac7dcfc2e.zip | |
parisc: Rework arch_rw locking functions
Clean up the arch read/write locking functions based on the arc
implemenation. This improves readability of those functions.
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/include/asm/spinlock_types.h')
| -rw-r--r-- | arch/parisc/include/asm/spinlock_types.h | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/arch/parisc/include/asm/spinlock_types.h b/arch/parisc/include/asm/spinlock_types.h index 42979c5704dc..ca39ee350c3f 100644 --- a/arch/parisc/include/asm/spinlock_types.h +++ b/arch/parisc/include/asm/spinlock_types.h @@ -12,11 +12,19 @@ typedef struct { #endif } arch_spinlock_t; + +/* counter: + * Unlocked : 0x0100_0000 + * Read lock(s) : 0x00FF_FFFF to 0x01 (Multiple Readers decrement it) + * Write lock : 0x0, but only if prior value is "unlocked" 0x0100_0000 + */ typedef struct { - arch_spinlock_t lock; - volatile int counter; + arch_spinlock_t lock_mutex; + volatile unsigned int counter; } arch_rwlock_t; -#define __ARCH_RW_LOCK_UNLOCKED { __ARCH_SPIN_LOCK_UNLOCKED, 0 } +#define __ARCH_RW_LOCK_UNLOCKED__ 0x01000000 +#define __ARCH_RW_LOCK_UNLOCKED { .lock_mutex = __ARCH_SPIN_LOCK_UNLOCKED, \ + .counter = __ARCH_RW_LOCK_UNLOCKED__ } #endif |