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authorLinus Torvalds <torvalds@linux-foundation.org>2012-02-10 09:05:52 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-02-10 09:05:52 -0800
commitaf5feae3d7e821d8c4d38103a7f53146f2590892 (patch)
tree9017bb0661fb617177534f0617c3771d89e31afc /include
parentce2814f227d3adae8456f7cbd0bd5f922fd284f0 (diff)
parent977b7e3a52a7421ad33a393a38ece59f3d41c2fa (diff)
Merge tag 'writeback-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux
fix 1 mysterious divide error fix 3 NULL dereference bugs in writeback tracing, on SD card removal w/o umount * tag 'writeback-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux: writeback: fix dereferencing NULL bdi->dev on trace_writeback_queue lib: proportion: lower PROP_MAX_SHIFT to 32 on 64-bit kernel writeback: fix NULL bdi->dev in trace writeback_single_inode backing-dev: fix wakeup timer races with bdi_unregister()
Diffstat (limited to 'include')
-rw-r--r--include/linux/proportions.h4
-rw-r--r--include/trace/events/writeback.h7
2 files changed, 9 insertions, 2 deletions
diff --git a/include/linux/proportions.h b/include/linux/proportions.h
index ef35bb73f69..26a8a4ed9b0 100644
--- a/include/linux/proportions.h
+++ b/include/linux/proportions.h
@@ -81,7 +81,11 @@ void prop_inc_percpu(struct prop_descriptor *pd, struct prop_local_percpu *pl)
* Limit the time part in order to ensure there are some bits left for the
* cycle counter and fraction multiply.
*/
+#if BITS_PER_LONG == 32
#define PROP_MAX_SHIFT (3*BITS_PER_LONG/4)
+#else
+#define PROP_MAX_SHIFT (BITS_PER_LONG/2)
+#endif
#define PROP_FRAC_SHIFT (BITS_PER_LONG - PROP_MAX_SHIFT - 1)
#define PROP_FRAC_BASE (1UL << PROP_FRAC_SHIFT)
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index 8588a891802..5973410e8f8 100644
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -47,7 +47,10 @@ DECLARE_EVENT_CLASS(writeback_work_class,
__field(int, reason)
),
TP_fast_assign(
- strncpy(__entry->name, dev_name(bdi->dev), 32);
+ struct device *dev = bdi->dev;
+ if (!dev)
+ dev = default_backing_dev_info.dev;
+ strncpy(__entry->name, dev_name(dev), 32);
__entry->nr_pages = work->nr_pages;
__entry->sb_dev = work->sb ? work->sb->s_dev : 0;
__entry->sync_mode = work->sync_mode;
@@ -426,7 +429,7 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
TP_fast_assign(
strncpy(__entry->name,
- dev_name(inode->i_mapping->backing_dev_info->dev), 32);
+ dev_name(inode_to_bdi(inode)->dev), 32);
__entry->ino = inode->i_ino;
__entry->state = inode->i_state;
__entry->dirtied_when = inode->dirtied_when;