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powerpc/mm/slice: Remove intermediate bitmap copy 

bitmap_or() and bitmap_andnot() can work properly with dst identical
to src1 or src2. There is no need of an intermediate result bitmap
that is copied back to dst in a second step.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2018-02-22 15:27:20 +01:00 committed by Michael Ellerman
parent 51d42f0f5f
commit 326691ad4f
1 changed files with 4 additions and 8 deletions
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12
arch/powerpc/mm/slice.c
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@ -388,21 +388,17 @@ static unsigned long slice_find_area(struct mm_struct *mm, unsigned long len,
static inline void slice_or_mask(struct slice_mask *dst, struct slice_mask *src)
{
DECLARE_BITMAP(result, SLICE_NUM_HIGH);
dst->low_slices |= src->low_slices;
bitmap_or(result, dst->high_slices, src->high_slices, SLICE_NUM_HIGH);
bitmap_copy(dst->high_slices, result, SLICE_NUM_HIGH);
bitmap_or(dst->high_slices, dst->high_slices, src->high_slices,
SLICE_NUM_HIGH);
}
static inline void slice_andnot_mask(struct slice_mask *dst, struct slice_mask *src)
{
DECLARE_BITMAP(result, SLICE_NUM_HIGH);
dst->low_slices &= ~src->low_slices;
bitmap_andnot(result, dst->high_slices, src->high_slices, SLICE_NUM_HIGH);
bitmap_copy(dst->high_slices, result, SLICE_NUM_HIGH);
bitmap_andnot(dst->high_slices, dst->high_slices, src->high_slices,
SLICE_NUM_HIGH);
}
#ifdef CONFIG_PPC_64K_PAGES