The patch titled
Subject: zram: use zram_slot_lock instead of raw bit_spin_lock op
has been added to the -mm tree. Its filename is
zram-use-zram_slot_lock-instead-of-raw-bit_spin_lock-op.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/zram-use-zram_slot_lock-instead-of-raw-bit_spin_lock-op.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/zram-use-zram_slot_lock-instead-of-raw-bit_spin_lock-op.patch
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: zram: use zram_slot_lock instead of raw bit_spin_lock op
With this cleanup phase, I want to use zram's wrapper function to lock
table access which is more consistent with other zram's functions.
Link: http://lkml.kernel.org/r/1491196653-7388-4-git-send-email-minchan@xxxxxxxxxx
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Johannes Thumshirn <jthumshirn@xxxxxxx>
Cc: Mika Penttil <mika.penttila@xxxxxxxxxxxx>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/zram/zram_drv.c | 42 +++++++++++++++++++++-----------
1 file changed, 28 insertions(+), 14 deletions(-)
diff -puN drivers/block/zram/zram_drv.c~zram-use-zram_slot_lock-instead-of-raw-bit_spin_lock-op drivers/block/zram/zram_drv.c
--- a/drivers/block/zram/zram_drv.c~zram-use-zram_slot_lock-instead-of-raw-bit_spin_lock-op
+++ a/drivers/block/zram/zram_drv.c
@@ -415,24 +415,39 @@ static DEVICE_ATTR_RO(io_stat);
static DEVICE_ATTR_RO(mm_stat);
static DEVICE_ATTR_RO(debug_stat);
+
+static void zram_slot_lock(struct zram *zram, u32 index)
+{
+ struct zram_meta *meta = zram->meta;
+
+ bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+}
+
+static void zram_slot_unlock(struct zram *zram, u32 index)
+{
+ struct zram_meta *meta = zram->meta;
+
+ bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+}
+
static bool zram_special_page_read(struct zram *zram, u32 index,
struct page *page,
unsigned int offset, unsigned int len)
{
struct zram_meta *meta = zram->meta;
- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_lock(zram, index);
if (unlikely(!meta->table[index].handle) ||
zram_test_flag(meta, index, ZRAM_SAME)) {
void *mem;
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);
mem = kmap_atomic(page);
zram_fill_page(mem + offset, len, meta->table[index].element);
kunmap_atomic(mem);
return true;
}
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);
return false;
}
@@ -448,11 +463,11 @@ static bool zram_special_page_write(stru
kunmap_atomic(mem);
/* Free memory associated with this sector now. */
- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_lock(zram, index);
zram_free_page(zram, index);
zram_set_flag(meta, index, ZRAM_SAME);
zram_set_element(meta, index, element);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);
atomic64_inc(&zram->stats.same_pages);
return true;
@@ -559,7 +574,7 @@ static int zram_decompress_page(struct z
if (zram_special_page_read(zram, index, page, 0, PAGE_SIZE))
return 0;
- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_lock(zram, index);
handle = meta->table[index].handle;
size = zram_get_obj_size(meta, index);
@@ -578,7 +593,7 @@ static int zram_decompress_page(struct z
zcomp_stream_put(zram->comp);
}
zs_unmap_object(meta->mem_pool, handle);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);
/* Should NEVER happen. Return bio error if it does. */
if (unlikely(ret))
@@ -731,11 +746,11 @@ static int __zram_bvec_write(struct zram
* Free memory associated with this sector
* before overwriting unused sectors.
*/
- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_lock(zram, index);
zram_free_page(zram, index);
meta->table[index].handle = handle;
zram_set_obj_size(meta, index, comp_len);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);
/* Update stats */
atomic64_add(comp_len, &zram->stats.compr_data_size);
@@ -793,7 +808,6 @@ static void zram_bio_discard(struct zram
int offset, struct bio *bio)
{
size_t n = bio->bi_iter.bi_size;
- struct zram_meta *meta = zram->meta;
/*
* zram manages data in physical block size units. Because logical block
@@ -814,9 +828,9 @@ static void zram_bio_discard(struct zram
}
while (n >= PAGE_SIZE) {
- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_lock(zram, index);
zram_free_page(zram, index);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);
atomic64_inc(&zram->stats.notify_free);
index++;
n -= PAGE_SIZE;
@@ -925,9 +939,9 @@ static void zram_slot_free_notify(struct
zram = bdev->bd_disk->private_data;
meta = zram->meta;
- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_lock(zram, index);
zram_free_page(zram, index);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);
atomic64_inc(&zram->stats.notify_free);
}
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
mm-reclaim-madv_free-pages-fix.patch
mm-fix-lazyfree-bug-on-check-in-try_to_unmap_one.patch
mm-fix-lazyfree-bug-on-check-in-try_to_unmap_one-fix.patch
mm-do-not-use-double-negation-for-testing-page-flags.patch
mm-remove-unncessary-ret-in-page_referenced.patch
mm-remove-swap_dirty-in-ttu.patch
mm-remove-swap_mlock-check-for-swap_success-in-ttu.patch
mm-make-the-try_to_munlock-void-function.patch
mm-remove-swap_mlock-in-ttu.patch
mm-remove-swap_again-in-ttu.patch
mm-make-ttus-return-boolean.patch
mm-make-rmap_walk-void-function.patch
mm-make-rmap_one-boolean-function.patch
mm-remove-swap_.patch
mm-remove-swap_-fix.patch
zram-handle-multiple-pages-attached-bios-bvec.patch
zram-partial-io-refactoring.patch
zram-use-zram_slot_lock-instead-of-raw-bit_spin_lock-op.patch
zram-remove-zram_meta-structure.patch
zram-introduce-zram-data-accessor.patch
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