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Message-ID: <BD79186B4FD85F4B8E60E381CAEE1909015F91A0@mi8nycmail19.Mi8.com>
Date: Fri, 17 Apr 2009 14:13:39 -0400
From: "H Hartley Sweeten" <hartleys@...ionengravers.com>
To: "Johannes Weiner" <hannes@...xchg.org>
Cc: <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] mm/page-writeback.c: fix sparse warnings
mm: dirty limit type specifies should be unsigned long
get_dirty_limits() calls clip_bdi_dirty_limit() and task_dirty_limit()
with variable pbdi_dirty as one of the arguments. This variable is
an unsigned long * but both functions expect it to be a long *. This
causes the following sparse warnings:
warning: incorrect type in argument 3 (different signedness)
expected long *pbdi_dirty
got unsigned long *pbdi_dirty
warning: incorrect type in argument 2 (different signedness)
expected long *pdirty
got unsigned long *pbdi_dirty
Fix the warnings by changing the long * to unsigned long * in both
functions.
Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
---
Patch is also attached due to line wrapping in email.
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 30351f0..ad2a414 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -265,18 +265,19 @@ static void bdi_writeout_fraction(struct
backing_dev_info *bdi,
* This avoids exceeding the total dirty_limit when the floating
averages
* fluctuate too quickly.
*/
-static void
-clip_bdi_dirty_limit(struct backing_dev_info *bdi, long dirty, long
*pbdi_dirty)
+static void clip_bdi_dirty_limit(struct backing_dev_info *bdi,
+ unsigned long dirty, unsigned long *pbdi_dirty)
{
- long avail_dirty;
+ unsigned long avail_dirty;
- avail_dirty = dirty -
- (global_page_state(NR_FILE_DIRTY) +
+ avail_dirty = global_page_state(NR_FILE_DIRTY) +
global_page_state(NR_WRITEBACK) +
global_page_state(NR_UNSTABLE_NFS) +
- global_page_state(NR_WRITEBACK_TEMP));
+ global_page_state(NR_WRITEBACK_TEMP);
- if (avail_dirty < 0)
+ if (avail_dirty < dirty)
+ avail_dirty = dirty - avail_dirty;
+ else
avail_dirty = 0;
avail_dirty += bdi_stat(bdi, BDI_RECLAIMABLE) +
@@ -299,10 +300,10 @@ static inline void task_dirties_fraction(struct
task_struct *tsk,
*
* dirty -= (dirty/8) * p_{t}
*/
-static void task_dirty_limit(struct task_struct *tsk, long *pdirty)
+static void task_dirty_limit(struct task_struct *tsk, unsigned long
*pdirty)
{
long numerator, denominator;
- long dirty = *pdirty;
+ unsigned long dirty = *pdirty;
u64 inv = dirty >> 3;
task_dirties_fraction(tsk, &numerator, &denominator);
Download attachment "mm_page-writeback_sparse.patch" of type "application/octet-stream" (1491 bytes)
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