|author||David S. Miller <email@example.com>||2010-04-12 22:21:52 -0700|
|committer||David S. Miller <firstname.lastname@example.org>||2010-04-12 22:21:52 -0700|
sparc64: Adjust __raw_local_irq_save() to cooperate in NMIs.
If we are in an NMI then doing a plain raw_local_irq_disable() will write PIL_NORMAL_MAX into %pil, which is lower than PIL_NMI, and thus we'll re-enable NMIs and recurse. Doing a simple: %pil = %pil | PIL_NORMAL_MAX does what we want, if we're already at PIL_NMI (15) we leave it at that setting, else we set it to PIL_NORMAL_MAX (14). This should get the function tracer working on sparc64. Signed-off-by: David S. Miller <email@example.com>
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/sparc/include/asm/irqflags_64.h b/arch/sparc/include/asm/irqflags_64.h
index 8b49bf920df..a16e94c4b14 100644
@@ -76,9 +76,19 @@ static inline int raw_irqs_disabled(void)
static inline unsigned long __raw_local_irq_save(void)
- unsigned long flags = __raw_local_save_flags();
+ unsigned long flags, tmp;
+ /* Disable interrupts to PIL_NORMAL_MAX unless we already
+ * are using PIL_NMI, in which case PIL_NMI is retained.
+ __asm__ __volatile__(
+ "rdpr %%pil, %0\n\t"
+ "or %0, %2, %1\n\t"
+ "wrpr %1, 0x0, %%pil"
+ : "=r" (flags), "=r" (tmp)
+ : "i" (PIL_NORMAL_MAX)
+ : "memory"