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| author | David S. Miller <davem@davemloft.net> | 2010-04-12 22:21:52 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-04-12 22:21:52 -0700 |
| commit | 0c25e9e6cbe7b233bb91d14d0e2c258bf8e6ec83 (patch) | |
| tree | 5861eaf8ece8ad9bdd9b23c0f69f2d61c994961c /arch/sparc | |
| parent | cb256aa60409efd803806cfb0528a4b3f8397dba (diff) | |
| download | linux-0c25e9e6cbe7b233bb91d14d0e2c258bf8e6ec83.tar.bz2 | |
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 <davem@davemloft.net>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/include/asm/irqflags_64.h | 14 |
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 8b49bf920df3..a16e94c4b149 100644 --- a/arch/sparc/include/asm/irqflags_64.h +++ b/arch/sparc/include/asm/irqflags_64.h @@ -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; - raw_local_irq_disable(); + /* 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" + ); return flags; } |