Rik van Riel <[email protected]> wrote:
> Here is an incremental fix to the add-sem_is_read-write_locked
> patch in -mm. Also attached is a full version of that file,
> which can just be dropped into place - I've verified that none
> of the patches in your stack get rejects.
The comment attached to the drop-in replacement patch is wrong:
| [1. text/plain; add-sem_is_read-write_locked.patch]
|
| From: Rik Van Riel <[email protected]>
|
| Add sem_is_read/write_locked functions to the read/write semaphores, along the
| same lines of the *_is_locked spinlock functions. The swap token tuning patch
| uses sem_is_read_locked; sem_is_write_locked is added for completeness.
The function names you've used are incorrect.
Furthermore, the substance of the patch is wrong in a number of ways:
| Index: linux-2.6.13/include/asm-ppc64/rwsem.h
| ===================================================================
| --- linux-2.6.13.orig/include/asm-ppc64/rwsem.h
| +++ linux-2.6.13/include/asm-ppc64/rwsem.h
| @@ -163,5 +163,10 @@ static inline int rwsem_atomic_update(in
| return atomic_add_return(delta, (atomic_t *)(&sem->count));
| }
|
| +static inline int sem_is_read_locked(struct rw_semaphore *sem)
| +{
| + return (sem->count != 0);
| +}
| +
This uses the function wrong name. And:
| Index: linux-2.6.13/include/linux/rwsem-spinlock.h
| ===================================================================
| --- linux-2.6.13.orig/include/linux/rwsem-spinlock.h
| +++ linux-2.6.13/include/linux/rwsem-spinlock.h
| @@ -61,5 +61,15 @@ extern void FASTCALL(__up_read(struct rw
| extern void FASTCALL(__up_write(struct rw_semaphore *sem));
| extern void FASTCALL(__downgrade_write(struct rw_semaphore *sem));
|
| +static inline int sem_is_read_locked(struct rw_semaphore *sem)
| +{
| + return (sem->activity > 0);
| +}
| +
| +static inline int sem_is_write_locked(struct rw_semaphore *sem)
| +{
| + return (sem->activity < 0);
| +}
| +
Is inconsistent, though the tests are valid.
Also, you don't need to bracket the expression handed to the return directive,
but that's a minor matter.
David
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