[PATCH 3/6] C-language equivalents of include/asm-*/bitops.h
mita at miraclelinux.com
Thu Jan 26 13:13:18 EST 2006
On Wed, Jan 25, 2006 at 10:54:43PM +1100, Keith Owens wrote:
> Be very, very careful about using these generic *_bit() routines if the
> architecture supports non-maskable interrupts.
> NMI events can occur at any time, including when interrupts have been
> disabled by *_irqsave(). So you can get NMI events occurring while a
> *_bit fucntion is holding a spin lock. If the NMI handler also wants
> to do bit manipulation (and they do) then you can get a deadlock
> between the original caller of *_bit() and the NMI handler.
> Doing any work that requires spinlocks in an NMI handler is just asking
> for deadlock problems. The generic *_bit() routines add a hidden
> spinlock behind what was previously a safe operation. I would even say
> that any arch that supports any type of NMI event _must_ define its own
> bit routines that do not rely on your _atomic_spin_lock_irqsave() and
> its hash of spinlocks.
At least cris and parisc are using similar *_bit function on SMP.
I will add your advise in comment.
--- ./include/asm-generic/bitops.h.orig 2006-01-26 10:56:00.000000000 +0900
+++ ./include/asm-generic/bitops.h 2006-01-26 11:01:28.000000000 +0900
@@ -50,6 +50,16 @@ extern raw_spinlock_t __atomic_hash[ATOM
* C language equivalents written by Theodore Ts'o, 9/26/92
+ * NMI events can occur at any time, including when interrupts have been
+ * disabled by *_irqsave(). So you can get NMI events occurring while a
+ * *_bit fucntion is holding a spin lock. If the NMI handler also wants
+ * to do bit manipulation (and they do) then you can get a deadlock
+ * between the original caller of *_bit() and the NMI handler.
+ * by Keith Owens
static __inline__ void set_bit(int nr, volatile unsigned long *addr)
unsigned long mask = BITOP_MASK(nr);
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