On Tue, 03 Jan 2012 23:26:24 +0100, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
On Mon, 2 Jan 2012 12:24:12 +0200
Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx> wrote:
on_each_cpu_mask calls a function on processors specified my cpumask,
which may include the local processor.
@@ -132,6 +139,15 @@ static inline int up_smp_call_function(smp_call_func_t func, void *info)
local_irq_enable(); \
0; \
})
+#define on_each_cpu_mask(mask, func, info, wait) \
+ do { \
+ if (cpumask_test_cpu(0, (mask))) { \
+ local_irq_disable(); \
+ (func)(info); \
+ local_irq_enable(); \
+ } \
+ } while (0)
Why is the cpumask_test_cpu() call there? It's hard to think of a
reason why "mask" would specify any CPU other than "0" in a
uniprocessor kernel.
It may specify none. For instance, in drain_all_pages() case, if the
CPU has no pages on PCP lists, the mask will be empty and so the
cpumask_test_cpu() will return zero.
--
Best regards, _ _
.o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o
..o | Computer Science, Michał “mina86” Nazarewicz (o o)
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