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| author | David S. Miller <davem@davemloft.net> | 2010-04-14 02:04:29 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-04-14 02:04:29 -0700 |
| commit | ec687886de00e1e63f3d821ccade9a61590408ed (patch) | |
| tree | 093e303475754d30b679bd35ae9cc5522832057e /arch/sparc/kernel/nmi.c | |
| parent | 035df35d968323f6f463c8789553e8589efcbcd4 (diff) | |
| download | linux-ec687886de00e1e63f3d821ccade9a61590408ed.tar.gz linux-ec687886de00e1e63f3d821ccade9a61590408ed.tar.bz2 linux-ec687886de00e1e63f3d821ccade9a61590408ed.zip | |
sparc64: Run NMIs on the hardirq stack.
Otherwise we can overflow the main stack with the function tracer
enabled.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel/nmi.c')
| -rw-r--r-- | arch/sparc/kernel/nmi.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/sparc/kernel/nmi.c b/arch/sparc/kernel/nmi.c index 75a3d1a25356..a4bd7ba74c89 100644 --- a/arch/sparc/kernel/nmi.c +++ b/arch/sparc/kernel/nmi.c @@ -23,6 +23,8 @@ #include <asm/ptrace.h> #include <asm/pcr.h> +#include "kstack.h" + /* We don't have a real NMI on sparc64, but we can fake one * up using profiling counter overflow interrupts and interrupt * levels. @@ -92,6 +94,7 @@ static void die_nmi(const char *str, struct pt_regs *regs, int do_panic) notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs) { unsigned int sum, touched = 0; + void *orig_sp; clear_softint(1 << irq); @@ -99,6 +102,8 @@ notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs) nmi_enter(); + orig_sp = set_hardirq_stack(); + if (notify_die(DIE_NMI, "nmi", regs, 0, pt_regs_trap_type(regs), SIGINT) == NOTIFY_STOP) touched = 1; @@ -124,6 +129,8 @@ notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs) pcr_ops->write(pcr_enable); } + restore_hardirq_stack(orig_sp); + nmi_exit(); } |