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authorKent Overstreet <kmo@daterainc.com>2014-01-19 08:26:37 +0000
committerNicholas Bellinger <nab@linux-iscsi.org>2014-01-23 20:17:18 +0000
commit6f6b5d1ec56acdeab0503d2b823f6f88a0af493e (patch)
tree7a95dca01cc9ddd652ccbfba4df9d5c30abda549 /include/linux/percpu_ida.h
parentiscsi-target: Pre-allocate more tags to avoid ack starvation (diff)
downloadlinux-dev-6f6b5d1ec56acdeab0503d2b823f6f88a0af493e.tar.xz
linux-dev-6f6b5d1ec56acdeab0503d2b823f6f88a0af493e.zip
percpu_ida: Make percpu_ida_alloc + callers accept task state bitmask
This patch changes percpu_ida_alloc() + callers to accept task state bitmask for prepare_to_wait() for code like target/iscsi that needs it for interruptible sleep, that is provided in a subsequent patch. It now expects TASK_UNINTERRUPTIBLE when the caller is able to sleep waiting for a new tag, or TASK_RUNNING when the caller cannot sleep, and is forced to return a negative value when no tags are available. v2 changes: - Include blk-mq + tcm_fc + vhost/scsi + target/iscsi changes - Drop signal_pending_state() call v3 changes: - Only call prepare_to_wait() + finish_wait() when != TASK_RUNNING (PeterZ) Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Kent Overstreet <kmo@daterainc.com> Cc: <stable@vger.kernel.org> #3.12+ Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'include/linux/percpu_ida.h')
-rw-r--r--include/linux/percpu_ida.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/percpu_ida.h b/include/linux/percpu_ida.h
index 1900bd0fa639..f5cfdd6a5539 100644
--- a/include/linux/percpu_ida.h
+++ b/include/linux/percpu_ida.h
@@ -4,6 +4,7 @@
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/init.h>
+#include <linux/sched.h>
#include <linux/spinlock_types.h>
#include <linux/wait.h>
#include <linux/cpumask.h>
@@ -61,7 +62,7 @@ struct percpu_ida {
/* Max size of percpu freelist, */
#define IDA_DEFAULT_PCPU_SIZE ((IDA_DEFAULT_PCPU_BATCH_MOVE * 3) / 2)
-int percpu_ida_alloc(struct percpu_ida *pool, gfp_t gfp);
+int percpu_ida_alloc(struct percpu_ida *pool, int state);
void percpu_ida_free(struct percpu_ida *pool, unsigned tag);
void percpu_ida_destroy(struct percpu_ida *pool);