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smp: Iterate functions through llist_for_each_entry_safe() 

The IPI function llist iteration is open coded. Lets simplify this
with using an llist iterator.

Also we want to keep the iteration safe against possible
csd.llist->next value reuse from the IPI handler. At least the block
subsystem used to do such things so lets stay careful and use
llist_for_each_entry_safe().

Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jens Axboe <axboe@fb.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jan Kara 2014-02-24 16:39:55 +01:00 committed by Jens Axboe
parent 6d113398dc
commit 5fd77595ec
1 changed files with 3 additions and 9 deletions
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12
kernel/smp.c
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@ -151,7 +151,8 @@ static void generic_exec_single(int cpu, struct call_single_data *csd, int wait)
*/ */
void generic_smp_call_function_single_interrupt(void) void generic_smp_call_function_single_interrupt(void)
{ {
struct llist_node *entry, *next; struct llist_node *entry;
struct call_single_data *csd, *csd_next;
/* /*
* Shouldn't receive this interrupt on a cpu that is not yet online. * Shouldn't receive this interrupt on a cpu that is not yet online.
@ -161,16 +162,9 @@ void generic_smp_call_function_single_interrupt(void)
entry = llist_del_all(&__get_cpu_var(call_single_queue)); entry = llist_del_all(&__get_cpu_var(call_single_queue));
entry = llist_reverse_order(entry); entry = llist_reverse_order(entry);
while (entry) { llist_for_each_entry_safe(csd, csd_next, entry, llist) {
struct call_single_data *csd;
next = entry->next;
csd = llist_entry(entry, struct call_single_data, llist);
csd->func(csd->info); csd->func(csd->info);
csd_unlock(csd); csd_unlock(csd);
entry = next;
} }
} }