The patch titled
Subject: lib: bitmap: eliminate branch in __bitmap_shift_right
has been removed from the -mm tree. Its filename was
lib-bitmap-eliminate-branch-in-__bitmap_shift_right.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Subject: lib: bitmap: eliminate branch in __bitmap_shift_right
We can shift the bits from lower and upper into place before assembling
dst[k]; moving the shift of upper into the branch where we already know
that rem is non-zero allows us to remove a conditional.
Signed-off-by: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/bitmap.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff -puN lib/bitmap.c~lib-bitmap-eliminate-branch-in-__bitmap_shift_right lib/bitmap.c
--- a/lib/bitmap.c~lib-bitmap-eliminate-branch-in-__bitmap_shift_right
+++ a/lib/bitmap.c
@@ -129,13 +129,13 @@ void __bitmap_shift_right(unsigned long
upper = src[off + k + 1];
if (off + k + 1 == lim - 1 && left)
upper &= mask;
+ upper <<= (BITS_PER_LONG - rem);
}
lower = src[off + k];
if (left && off + k == lim - 1)
lower &= mask;
- dst[k] = lower >> rem;
- if (rem)
- dst[k] |= upper << (BITS_PER_LONG - rem);
+ lower >>= rem;
+ dst[k] = lower | upper;
if (left && k == lim - 1)
dst[k] &= mask;
}
_
Patches currently in -mm which might be from linux@xxxxxxxxxxxxxxxxxx are
origin.patch
linux-next.patch
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