mm/percpu.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-)
In the logic for hiding the end of the bitmap, there are several places
where the same value 'region_bits - offset_bits' is calculated over and
over again using different methods. Eliminate these redundant calculations
to improve code readability.
Signed-off-by: Yuntao Wang <ytcoode@gmail.com>
---
mm/percpu.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
diff --git a/mm/percpu.c b/mm/percpu.c
index 4e11fc1e6def..2a051f00f68d 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1421,15 +1421,13 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr,
if (chunk->end_offset) {
/* hide the end of the bitmap */
offset_bits = chunk->end_offset / PCPU_MIN_ALLOC_SIZE;
- bitmap_set(chunk->alloc_map,
- pcpu_chunk_map_bits(chunk) - offset_bits,
- offset_bits);
- set_bit((start_offset + map_size) / PCPU_MIN_ALLOC_SIZE,
- chunk->bound_map);
+ start_offset = region_bits - offset_bits;
+
+ bitmap_set(chunk->alloc_map, start_offset, offset_bits);
+ set_bit(start_offset, chunk->bound_map);
set_bit(region_bits, chunk->bound_map);
- pcpu_block_update_hint_alloc(chunk, pcpu_chunk_map_bits(chunk)
- - offset_bits, offset_bits);
+ pcpu_block_update_hint_alloc(chunk, start_offset, offset_bits);
}
return chunk;
--
2.44.0
Hi Yuntao, On Tue, Apr 23, 2024 at 09:55:25PM +0800, Yuntao Wang wrote: > In the logic for hiding the end of the bitmap, there are several places > where the same value 'region_bits - offset_bits' is calculated over and > over again using different methods. Eliminate these redundant calculations > to improve code readability. > > Signed-off-by: Yuntao Wang <ytcoode@gmail.com> > --- > mm/percpu.c | 12 +++++------- > 1 file changed, 5 insertions(+), 7 deletions(-) > > diff --git a/mm/percpu.c b/mm/percpu.c > index 4e11fc1e6def..2a051f00f68d 100644 > --- a/mm/percpu.c > +++ b/mm/percpu.c > @@ -1421,15 +1421,13 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr, > if (chunk->end_offset) { > /* hide the end of the bitmap */ > offset_bits = chunk->end_offset / PCPU_MIN_ALLOC_SIZE; > - bitmap_set(chunk->alloc_map, > - pcpu_chunk_map_bits(chunk) - offset_bits, > - offset_bits); > - set_bit((start_offset + map_size) / PCPU_MIN_ALLOC_SIZE, > - chunk->bound_map); > + start_offset = region_bits - offset_bits; Generally I think this makes sense, but I'm less inclined to mix the start_offset variable name in here. A helper function might make this cleaner, consolidating the start_offset and end_offset logic. static void pcpu_chunk_hide_region(chunk, bit_off, bits); Thanks, Dennis > + > + bitmap_set(chunk->alloc_map, start_offset, offset_bits); > + set_bit(start_offset, chunk->bound_map); > set_bit(region_bits, chunk->bound_map); > > - pcpu_block_update_hint_alloc(chunk, pcpu_chunk_map_bits(chunk) > - - offset_bits, offset_bits); > + pcpu_block_update_hint_alloc(chunk, start_offset, offset_bits); > } > > return chunk; > -- > 2.44.0 >
In the logic for hiding the end region of the chunk, there are several
places where the same value 'region_bits - offset_bits' is calculated
over and over again using different methods. Eliminating these redundant
calculations can improve code readability.
Additionally, there is a lot of repetitive code when hiding the start and
end regions of the chunk. We can consolidate this logic into a function,
making the final code cleaner and more concise.
Signed-off-by: Yuntao Wang <ytcoode@gmail.com>
---
v1 -> v2: Optimize the code based on Dennis's suggestion
mm/percpu.c | 27 ++++++++++++---------------
1 file changed, 12 insertions(+), 15 deletions(-)
diff --git a/mm/percpu.c b/mm/percpu.c
index 4e11fc1e6def..d22b317f3d41 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1329,6 +1329,15 @@ static void pcpu_init_md_blocks(struct pcpu_chunk *chunk)
pcpu_init_md_block(md_block, PCPU_BITMAP_BLOCK_BITS);
}
+static void pcpu_chunk_hide_region(struct pcpu_chunk *chunk, int bit_off,
+ int bits)
+{
+ bitmap_set(chunk->alloc_map, bit_off, bits);
+ set_bit(bit_off, chunk->bound_map);
+ set_bit(bit_off + bits, chunk->bound_map);
+ pcpu_block_update_hint_alloc(chunk, bit_off, bits);
+}
+
/**
* pcpu_alloc_first_chunk - creates chunks that serve the first chunk
* @tmp_addr: the start of the region served
@@ -1409,27 +1418,15 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr,
if (chunk->start_offset) {
/* hide the beginning of the bitmap */
offset_bits = chunk->start_offset / PCPU_MIN_ALLOC_SIZE;
- bitmap_set(chunk->alloc_map, 0, offset_bits);
- set_bit(0, chunk->bound_map);
- set_bit(offset_bits, chunk->bound_map);
-
chunk->chunk_md.first_free = offset_bits;
-
- pcpu_block_update_hint_alloc(chunk, 0, offset_bits);
+ pcpu_chunk_hide_region(chunk, 0, offset_bits);
}
if (chunk->end_offset) {
/* hide the end of the bitmap */
offset_bits = chunk->end_offset / PCPU_MIN_ALLOC_SIZE;
- bitmap_set(chunk->alloc_map,
- pcpu_chunk_map_bits(chunk) - offset_bits,
- offset_bits);
- set_bit((start_offset + map_size) / PCPU_MIN_ALLOC_SIZE,
- chunk->bound_map);
- set_bit(region_bits, chunk->bound_map);
-
- pcpu_block_update_hint_alloc(chunk, pcpu_chunk_map_bits(chunk)
- - offset_bits, offset_bits);
+ pcpu_chunk_hide_region(chunk, region_bits - offset_bits,
+ offset_bits);
}
return chunk;
--
2.44.0
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