On 2019/7/29 14:51, Gao Xiang wrote:
> remove duplicated code in decompressor by introducing
> failable erofs_allocpage().
>
> Signed-off-by: Gao Xiang <gaoxian...@huawei.com>
> ---
> drivers/staging/erofs/decompressor.c | 12 +++---------
> drivers/staging/erofs/internal.h | 2 +-
> drivers/staging/erofs/utils.c | 5 +++--
> drivers/staging/erofs/zdata.c | 2 +-
> 4 files changed, 8 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/staging/erofs/decompressor.c
> b/drivers/staging/erofs/decompressor.c
> index ee5762351f80..744c43a456e9 100644
> --- a/drivers/staging/erofs/decompressor.c
> +++ b/drivers/staging/erofs/decompressor.c
> @@ -74,15 +74,9 @@ static int lz4_prepare_destpages(struct
> z_erofs_decompress_req *rq,
> victim = availables[--top];
> get_page(victim);
> } else {
> - if (!list_empty(pagepool)) {
> - victim = lru_to_page(pagepool);
> - list_del(&victim->lru);
> - DBG_BUGON(page_ref_count(victim) != 1);
> - } else {
> - victim = alloc_pages(GFP_KERNEL, 0);
> - if (!victim)
> - return -ENOMEM;
> - }
> + victim = erofs_allocpage(pagepool, GFP_KERNEL, false);
> + if (unlikely(!victim))
> + return -ENOMEM;
> victim->mapping = Z_EROFS_MAPPING_STAGING;
> }
> rq->out[i] = victim;
> diff --git a/drivers/staging/erofs/internal.h
> b/drivers/staging/erofs/internal.h
> index b206a85776b4..e35c7d8f75d2 100644
> --- a/drivers/staging/erofs/internal.h
> +++ b/drivers/staging/erofs/internal.h
> @@ -517,7 +517,7 @@ int erofs_namei(struct inode *dir, struct qstr *name,
> extern const struct file_operations erofs_dir_fops;
>
> /* utils.c / zdata.c */
> -struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp);
> +struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp, bool nofail);
>
> #if (EROFS_PCPUBUF_NR_PAGES > 0)
> void *erofs_get_pcpubuf(unsigned int pagenr);
> diff --git a/drivers/staging/erofs/utils.c b/drivers/staging/erofs/utils.c
> index 0e86e44d60d0..260ea2970b4b 100644
> --- a/drivers/staging/erofs/utils.c
> +++ b/drivers/staging/erofs/utils.c
> @@ -9,15 +9,16 @@
> #include "internal.h"
> #include <linux/pagevec.h>
>
> -struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp)
> +struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp, bool nofail)
> {
> struct page *page;
>
> if (!list_empty(pool)) {
> page = lru_to_page(pool);
> + DBG_BUGON(page_ref_count(page) != 1);
> list_del(&page->lru);
> } else {
> - page = alloc_pages(gfp | __GFP_NOFAIL, 0);
> + page = alloc_pages(gfp | (nofail ? __GFP_NOFAIL : 0), 0);
> }
> return page;
> }
> diff --git a/drivers/staging/erofs/zdata.c b/drivers/staging/erofs/zdata.c
> index bc478eebf509..02560b940558 100644
> --- a/drivers/staging/erofs/zdata.c
> +++ b/drivers/staging/erofs/zdata.c
> @@ -634,7 +634,7 @@ z_erofs_vle_work_iter_end(struct z_erofs_vle_work_builder
> *builder)
> static inline struct page *__stagingpage_alloc(struct list_head *pagepool,
> gfp_t gfp)
> {
> - struct page *page = erofs_allocpage(pagepool, gfp);
> + struct page *page = erofs_allocpage(pagepool, gfp, true);
>
> if (unlikely(!page))
> return NULL;
Should remove it.
Otherwise, it looks good to me.
Reviewed-by: Chao Yu <yuch...@huawei.com>
Thanks,
>
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