Back in January 2005, Ingo wrote:
NOTE to architecture maintainers: generic_raw_read_trylock() is a crude
version that should be replaced with the proper arch-optimized version
ASAP.
He didn't really phrase that strongly enough. It should have read:
NOTE to architecture maintainers: generic_raw_read_trylock() is
completely unfit for use and will cause lockups if used in interrupt
context.
I propose we delete this from the tree, turning a rather nasty and hard
to track down runtime failure into a simple to fix buildtime failure on
the following architectures:
include/asm-arm/spinlock.h:#define __raw_read_trylock(lock)
generic__raw_read_trylock(lock)
include/asm-m32r/spinlock.h:#define __raw_read_trylock(lock)
generic__raw_read_trylock(lock)
include/asm-mips/spinlock.h:#define __raw_read_trylock(lock)
generic__raw_read_trylock(lock)
include/asm-parisc/spinlock.h:#define __raw_read_trylock(lock)
generic__raw_read_trylock(lock)
include/asm-sh/spinlock.h:#define __raw_read_trylock(lock)
generic__raw_read_trylock(lock)
include/asm-sparc/spinlock.h:#define __raw_read_trylock(lock)
generic__raw_read_trylock(lock)
MIPS is already fixed out of tree. ARM, M32R, SH and SPARC need to
be fixed. We're redoing the PA-RISC implementation right now, which is
how I noticed this, er, minor problem.
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 31473db..6ed1e54 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -77,8 +77,6 @@ #define __lockfunc fastcall __attribute_
*/
#include <linux/spinlock_types.h>
-extern int __lockfunc generic__raw_read_trylock(raw_rwlock_t *lock);
-
/*
* Pull the __raw*() functions/declarations (UP-nondebug doesnt need them):
*/
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index bfd6ad9..c9f1541 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -16,17 +16,6 @@ #include <linux/interrupt.h>
#include <linux/debug_locks.h>
#include <linux/module.h>
-/*
- * Generic declaration of the raw read_trylock() function,
- * architectures are supposed to optimize this:
- */
-int __lockfunc generic__raw_read_trylock(raw_rwlock_t *lock)
-{
- __raw_read_lock(lock);
- return 1;
-}
-EXPORT_SYMBOL(generic__raw_read_trylock);
-
int __lockfunc _spin_trylock(spinlock_t *lock)
{
preempt_disable();
-
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