The patch titled
Subject: zram: introduce zram data accessor
has been added to the -mm tree. Its filename is
zram-introduce-zram-data-accessor.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/zram-introduce-zram-data-accessor.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/zram-introduce-zram-data-accessor.patch
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: zram: introduce zram data accessor
With element, sometime I got confused handle and element access. It might
be my bad but I think it's time to introduce accessor to prevent future
idiot like me. This patch is just clean-up patch so it shouldn't change
any behavior.
Link: http://lkml.kernel.org/r/1491196653-7388-6-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 | 33 +++++++++++++++++++++-----------
1 file changed, 22 insertions(+), 11 deletions(-)
diff -puN drivers/block/zram/zram_drv.c~zram-introduce-zram-data-accessor drivers/block/zram/zram_drv.c
--- a/drivers/block/zram/zram_drv.c~zram-introduce-zram-data-accessor
+++ a/drivers/block/zram/zram_drv.c
@@ -57,6 +57,16 @@ static inline struct zram *dev_to_zram(s
return (struct zram *)dev_to_disk(dev)->private_data;
}
+static unsigned long zram_get_handle(struct zram *zram, u32 index)
+{
+ return zram->table[index].handle;
+}
+
+static void zram_set_handle(struct zram *zram, u32 index, unsigned long handle)
+{
+ zram->table[index].handle = handle;
+}
+
/* flag operations require table entry bit_spin_lock() being held */
static int zram_test_flag(struct zram *zram, u32 index,
enum zram_pageflags flag)
@@ -82,9 +92,9 @@ static inline void zram_set_element(stru
zram->table[index].element = element;
}
-static inline void zram_clear_element(struct zram *zram, u32 index)
+static unsigned long zram_get_element(struct zram *zram, u32 index)
{
- zram->table[index].element = 0;
+ return zram->table[index].element;
}
static size_t zram_get_obj_size(struct zram *zram, u32 index)
@@ -428,13 +438,14 @@ static bool zram_special_page_read(struc
unsigned int offset, unsigned int len)
{
zram_slot_lock(zram, index);
- if (unlikely(!zram->table[index].handle) ||
- zram_test_flag(zram, index, ZRAM_SAME)) {
+ if (unlikely(!zram_get_handle(zram, index) ||
+ zram_test_flag(zram, index, ZRAM_SAME))) {
void *mem;
zram_slot_unlock(zram, index);
mem = kmap_atomic(page);
- zram_fill_page(mem + offset, len, zram->table[index].element);
+ zram_fill_page(mem + offset, len,
+ zram_get_element(zram, index));
kunmap_atomic(mem);
return true;
}
@@ -473,7 +484,7 @@ static void zram_meta_free(struct zram *
/* Free all pages that are still in this zram device */
for (index = 0; index < num_pages; index++) {
- unsigned long handle = zram->table[index].handle;
+ unsigned long handle = zram_get_handle(zram, index);
/*
* No memory is allocated for same element filled pages.
* Simply clear same page flag.
@@ -513,7 +524,7 @@ static bool zram_meta_alloc(struct zram
*/
static void zram_free_page(struct zram *zram, size_t index)
{
- unsigned long handle = zram->table[index].handle;
+ unsigned long handle = zram_get_handle(zram, index);
/*
* No memory is allocated for same element filled pages.
@@ -521,7 +532,7 @@ static void zram_free_page(struct zram *
*/
if (zram_test_flag(zram, index, ZRAM_SAME)) {
zram_clear_flag(zram, index, ZRAM_SAME);
- zram_clear_element(zram, index);
+ zram_set_element(zram, index, 0);
atomic64_dec(&zram->stats.same_pages);
return;
}
@@ -535,7 +546,7 @@ static void zram_free_page(struct zram *
&zram->stats.compr_data_size);
atomic64_dec(&zram->stats.pages_stored);
- zram->table[index].handle = 0;
+ zram_set_handle(zram, index, 0);
zram_set_obj_size(zram, index, 0);
}
@@ -550,7 +561,7 @@ static int zram_decompress_page(struct z
return 0;
zram_slot_lock(zram, index);
- handle = zram->table[index].handle;
+ handle = zram_get_handle(zram, index);
size = zram_get_obj_size(zram, index);
src = zs_map_object(zram->mem_pool, handle, ZS_MM_RO);
@@ -721,7 +732,7 @@ static int __zram_bvec_write(struct zram
*/
zram_slot_lock(zram, index);
zram_free_page(zram, index);
- zram->table[index].handle = handle;
+ zram_set_handle(zram, index, handle);
zram_set_obj_size(zram, index, comp_len);
zram_slot_unlock(zram, index);
_
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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