On Tue, Sep 13, 2016 at 09:39:59AM -0400, Mike Snitzer wrote:
> So I'm not sure how this dm-bufio local cond_resched() wrapper still got
> in... happy to take your patch.
> 
> Please respond with whatever SOB you'd like applied to the patch header.

Sorry, for the delay, here goes.

---
Subject: dm: Remove dm_bufio_cond_resched()
From: Peter Zijlstra <pet...@infradead.org>
Date: Tue, 13 Sep 2016 10:45:20 +0200

Remove pointless local wrappery. Use cond_resched() like everybody else.

Cc: Ingo Molnar <mi...@kernel.org>
Cc: Mikulas Patocka <mpato...@redhat.com>
Cc: Mike Snitzer <snit...@redhat.com>
Cc: Alasdair Kergon <a...@redhat.com>
Acked-by: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
---
 drivers/md/dm-bufio.c |   31 +++++++++----------------------
 1 file changed, 9 insertions(+), 22 deletions(-)

--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -191,19 +191,6 @@ static void dm_bufio_unlock(struct dm_bu
        mutex_unlock(&c->lock);
 }
 
-/*
- * FIXME Move to sched.h?
- */
-#ifdef CONFIG_PREEMPT_VOLUNTARY
-#  define dm_bufio_cond_resched()              \
-do {                                           \
-       if (unlikely(need_resched()))           \
-               _cond_resched();                \
-} while (0)
-#else
-#  define dm_bufio_cond_resched()                do { } while (0)
-#endif
-
 /*----------------------------------------------------------------*/
 
 /*
@@ -741,7 +728,7 @@ static void __flush_write_list(struct li
                        list_entry(write_list->next, struct dm_buffer, 
write_list);
                list_del(&b->write_list);
                submit_io(b, WRITE, b->block, write_endio);
-               dm_bufio_cond_resched();
+               cond_resched();
        }
        blk_finish_plug(&plug);
 }
@@ -780,7 +767,7 @@ static struct dm_buffer *__get_unclaimed
                        __unlink_buffer(b);
                        return b;
                }
-               dm_bufio_cond_resched();
+               cond_resched();
        }
 
        list_for_each_entry_reverse(b, &c->lru[LIST_DIRTY], lru_list) {
@@ -791,7 +778,7 @@ static struct dm_buffer *__get_unclaimed
                        __unlink_buffer(b);
                        return b;
                }
-               dm_bufio_cond_resched();
+               cond_resched();
        }
 
        return NULL;
@@ -923,7 +910,7 @@ static void __write_dirty_buffers_async(
                        return;
 
                __write_dirty_buffer(b, write_list);
-               dm_bufio_cond_resched();
+               cond_resched();
        }
 }
 
@@ -973,7 +960,7 @@ static void __check_watermark(struct dm_
                        return;
 
                __free_buffer_wake(b);
-               dm_bufio_cond_resched();
+               cond_resched();
        }
 
        if (c->n_buffers[LIST_DIRTY] > threshold_buffers)
@@ -1170,7 +1157,7 @@ void dm_bufio_prefetch(struct dm_bufio_c
                                submit_io(b, READ, b->block, read_endio);
                        dm_bufio_release(b);
 
-                       dm_bufio_cond_resched();
+                       cond_resched();
 
                        if (!n_blocks)
                                goto flush_plug;
@@ -1291,7 +1278,7 @@ int dm_bufio_write_dirty_buffers(struct
                    !test_bit(B_WRITING, &b->state))
                        __relink_lru(b, LIST_CLEAN);
 
-               dm_bufio_cond_resched();
+               cond_resched();
 
                /*
                 * If we dropped the lock, the list is no longer consistent,
@@ -1574,7 +1561,7 @@ static unsigned long __scan(struct dm_bu
                                freed++;
                        if (!--nr_to_scan || ((count - freed) <= retain_target))
                                return freed;
-                       dm_bufio_cond_resched();
+                       cond_resched();
                }
        }
        return freed;
@@ -1808,7 +1795,7 @@ static void __evict_old_buffers(struct d
                if (__try_evict_buffer(b, 0))
                        count--;
 
-               dm_bufio_cond_resched();
+               cond_resched();
        }
 
        dm_bufio_unlock(c);

--
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