Re: linux-next: build failure after merge of the md tree

[Stephen Rothwell]

Hi Neil,

On Mon, 2 Mar 2015 17:11:49 +1100 Stephen Rothwell <s...@canb.auug.org.au> 
wrote:
>
> On Mon, 2 Mar 2015 17:03:45 +1100 NeilBrown <ne...@suse.de> wrote:
> >
> > I think
> > +               bm_blocks = DIV_ROUND_UP(bm_blocks, 4096);
> > 
> > needs DIV_ROUND_UP_SECTOR_T()
> 
> I tried that and it was not sufficient.
> 
> > The first patch you identified adds that line.  The second relocates it.
> 
> The second also changes this:
> 
> bm_blocks = sector_div(bitmap->mddev->resync_max_sectors, (chunksize >> 9));
> 
> (added by the first) to this:
> 
> bm_blocks = bitmap->mddev->resync_max_sectors / 
> (bitmap->mddev->bitmap_info.chunksize >> 9);
> 
> where bitmap->mddev->resync_max_sectors is a sector_t ...

So I applied this patch for today:

From: Stephen Rothwell <s...@canb.auug.org.au>
Date: Tue, 3 Mar 2015 13:30:26 +1100
Subject: [PATCH] md/bitmap: use sector_div for sector_t divisions

Signed-off-by: Stephen Rothwell <s...@canb.auug.org.au>
---
 drivers/md/bitmap.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 23f575f0cd92..d40398404ab6 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -573,7 +573,8 @@ re_read:
        if (bitmap->cluster_slot >= 0) {
                long long bm_blocks;
 
-               bm_blocks = bitmap->mddev->resync_max_sectors / 
(bitmap->mddev->bitmap_info.chunksize >> 9);
+               bm_blocks = sector_div(bitmap->mddev->resync_max_sectors,
+                                      bitmap->mddev->bitmap_info.chunksize >> 
9);
                bm_blocks = bm_blocks << 3;
                bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096);
                bitmap->mddev->bitmap_info.offset += bitmap->cluster_slot * 
(bm_blocks << 3);
-- 
2.1.4

-- 
Cheers,
Stephen Rothwell                    s...@canb.auug.org.au

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