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[IA64] SN: validate smp_affinity mask on intr redirect

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On SN, only allow one bit to be set in the smp_affinty mask when
redirecting an interrupt.  Currently setting multiple bits is allowed, but
only the first bit is used in determining the CPU to redirect to.  This has
caused confusion among some customers.

[akpm@linux-foundation.org: fixes]
Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
John Keller 2007-05-10 22:42:44 -07:00 • committed by Tony Luck
parent 3e3d327702
commit 25d61578da
3 changed files with 24 additions and 0 deletions
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7
kernel/irq/proc.c
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@ -27,6 +27,10 @@ static int irq_affinity_read_proc(char *page, char **start, off_t off,
return len;
}
#ifndef is_affinity_mask_valid
#define is_affinity_mask_valid(val) 1
#endif
int no_irq_affinity;
static int irq_affinity_write_proc(struct file *file, const char __user *buffer,
unsigned long count, void *data)
@ -42,6 +46,9 @@ static int irq_affinity_write_proc(struct file *file, const char __user *buffer,
if (err)
return err;
if (!is_affinity_mask_valid(new_value))
return -EINVAL;
/*
* Do not allow disabling IRQs completely - it's a too easy
* way to make the system unusable accidentally :-) At least