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| author | Yinghai Lu <yinghai@kernel.org> | 2009-04-27 17:59:53 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-28 12:21:16 +0200 |
| commit | 57b150cce8e004ddd36330490a68bfb59b7271e9 (patch) | |
| tree | f337b08b6cd9bbe165c709a7e5159b0d6d779238 /kernel/irq/internals.h | |
| parent | d5dedd4507d307eb3f35f21b6e16f336fdc0d82a (diff) | |
| download | linux-57b150cce8e004ddd36330490a68bfb59b7271e9.tar.gz linux-57b150cce8e004ddd36330490a68bfb59b7271e9.tar.bz2 linux-57b150cce8e004ddd36330490a68bfb59b7271e9.zip | |
irq: only update affinity if ->set_affinity() is sucessfull
irq_set_affinity() and move_masked_irq() try to assign affinity
before calling chip set_affinity(). Some archs are assigning it
in ->set_affinity() again.
We do something like:
cpumask_cpy(desc->affinity, mask);
desc->chip->set_affinity(mask);
But in the failure path, affinity should not be touched - otherwise
we'll end up with a different affinity mask despite the failure to
migrate the IRQ.
So try to update the afffinity only if set_affinity returns with 0.
Also call irq_set_thread_affinity accordingly.
v2: update after "irq, x86: Remove IRQ_DISABLED check in process context IRQ move"
v3: according to Ingo, change set_affinity() in irq_chip should return int.
v4: update comments by removing moving irq_desc code.
[ Impact: fix /proc/irq/*/smp_affinity setting corner case bug ]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
LKML-Reference: <49F65509.60307@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/irq/internals.h')
| -rw-r--r-- | kernel/irq/internals.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index 01ce20eab38f..de5f412f6a92 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -42,6 +42,9 @@ static inline void unregister_handler_proc(unsigned int irq, extern int irq_select_affinity_usr(unsigned int irq); +extern void +irq_set_thread_affinity(struct irq_desc *desc, const struct cpumask *cpumask); + /* * Debugging printout: */ |