2015-11-25 13:50:18

by Geliang Tang

Subject: [PATCH] target: use offset_in_page macro

Use offset_in_page macro instead of (addr & ~PAGE_MASK).

Signed-off-by: Geliang Tang <[email protected]>
---
drivers/target/target_core_user.c | 2 +-
drivers/target/tcm_fc/tfc_io.c | 8 ++++----
2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 937cebf..d5477c0 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -194,7 +194,7 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd)

static inline void tcmu_flush_dcache_range(void *vaddr, size_t size)
{
- unsigned long offset = (unsigned long) vaddr & ~PAGE_MASK;
+ unsigned long offset = offset_in_page(vaddr);

size = round_up(size+offset, PAGE_SIZE);
vaddr -= offset;
diff --git a/drivers/target/tcm_fc/tfc_io.c b/drivers/target/tcm_fc/tfc_io.c
index 847c1aa..6f7c65a 100644
--- a/drivers/target/tcm_fc/tfc_io.c
+++ b/drivers/target/tcm_fc/tfc_io.c
@@ -154,9 +154,9 @@ int ft_queue_data_in(struct se_cmd *se_cmd)
BUG_ON(!page);
from = kmap_atomic(page + (mem_off >> PAGE_SHIFT));
page_addr = from;
- from += mem_off & ~PAGE_MASK;
+ from += offset_in_page(mem_off);
tlen = min(tlen, (size_t)(PAGE_SIZE -
- (mem_off & ~PAGE_MASK)));
+ offset_in_page(mem_off)));
memcpy(to, from, tlen);
kunmap_atomic(page_addr);
to += tlen;
@@ -314,9 +314,9 @@ void ft_recv_write_data(struct ft_cmd *cmd, struct fc_frame *fp)

to = kmap_atomic(page + (mem_off >> PAGE_SHIFT));
page_addr = to;
- to += mem_off & ~PAGE_MASK;
+ to += offset_in_page(mem_off);
tlen = min(tlen, (size_t)(PAGE_SIZE -
- (mem_off & ~PAGE_MASK)));
+ offset_in_page(mem_off)));
memcpy(to, from, tlen);
kunmap_atomic(page_addr);

--
2.5.0

2015-11-25 13:59:14

by Sagi Grimberg

Subject: Re: [PATCH] target: use offset_in_page macro

Looks fine,

Reviewed-by: Sagi Grimberg <[email protected]>

2015-11-25 14:00:40

by Johannes Thumshirn

Subject: Re: [PATCH] target: use offset_in_page macro

On Wed, 2015-11-25 at 21:49 +0800, Geliang Tang wrote:
> Use offset_in_page macro instead of (addr & ~PAGE_MASK).
>
> Signed-off-by: Geliang Tang <[email protected]>
> ---
>  drivers/target/target_core_user.c | 2 +-
>  drivers/target/tcm_fc/tfc_io.c    | 8 ++++----
>  2 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/target/target_core_user.c
> b/drivers/target/target_core_user.c
> index 937cebf..d5477c0 100644
> --- a/drivers/target/target_core_user.c
> +++ b/drivers/target/target_core_user.c
> @@ -194,7 +194,7 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd
> *se_cmd)
>  
>  static inline void tcmu_flush_dcache_range(void *vaddr, size_t size)
>  {
> - unsigned long offset = (unsigned long) vaddr & ~PAGE_MASK;
> + unsigned long offset = offset_in_page(vaddr);
>  
>   size = round_up(size+offset, PAGE_SIZE);
>   vaddr -= offset;
> diff --git a/drivers/target/tcm_fc/tfc_io.c b/drivers/target/tcm_fc/tfc_io.c
> index 847c1aa..6f7c65a 100644
> --- a/drivers/target/tcm_fc/tfc_io.c
> +++ b/drivers/target/tcm_fc/tfc_io.c
> @@ -154,9 +154,9 @@ int ft_queue_data_in(struct se_cmd *se_cmd)
>   BUG_ON(!page);
>   from = kmap_atomic(page + (mem_off >> PAGE_SHIFT));
>   page_addr = from;
> - from += mem_off & ~PAGE_MASK;
> + from += offset_in_page(mem_off);
>   tlen = min(tlen, (size_t)(PAGE_SIZE -
> - (mem_off & ~PAGE_MASK)));
> + offset_in_page(mem_off)));
>   memcpy(to, from, tlen);
>   kunmap_atomic(page_addr);
>   to += tlen;
> @@ -314,9 +314,9 @@ void ft_recv_write_data(struct ft_cmd *cmd, struct
> fc_frame *fp)
>  
>   to = kmap_atomic(page + (mem_off >> PAGE_SHIFT));
>   page_addr = to;
> - to += mem_off & ~PAGE_MASK;
> + to += offset_in_page(mem_off);
>   tlen = min(tlen, (size_t)(PAGE_SIZE -
> -   (mem_off & ~PAGE_MASK)));
> +   offset_in_page(mem_off)));
>   memcpy(to, from, tlen);
>   kunmap_atomic(page_addr);
>  

Reviewed-by: Johannes Thumshirn <[email protected]>

2015-11-30 00:27:52

by Nicholas A. Bellinger

Subject: Re: [PATCH] target: use offset_in_page macro

Hi Geliang,

On Wed, 2015-11-25 at 21:49 +0800, Geliang Tang wrote:
> Use offset_in_page macro instead of (addr & ~PAGE_MASK).
>
> Signed-off-by: Geliang Tang <[email protected]>
> ---
> drivers/target/target_core_user.c | 2 +-
> drivers/target/tcm_fc/tfc_io.c | 8 ++++----
> 2 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
> index 937cebf..d5477c0 100644
> --- a/drivers/target/target_core_user.c
> +++ b/drivers/target/target_core_user.c
> @@ -194,7 +194,7 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd)
>
> static inline void tcmu_flush_dcache_range(void *vaddr, size_t size)
> {
> - unsigned long offset = (unsigned long) vaddr & ~PAGE_MASK;
> + unsigned long offset = offset_in_page(vaddr);
>
> size = round_up(size+offset, PAGE_SIZE);
> vaddr -= offset;
> diff --git a/drivers/target/tcm_fc/tfc_io.c b/drivers/target/tcm_fc/tfc_io.c
> index 847c1aa..6f7c65a 100644
> --- a/drivers/target/tcm_fc/tfc_io.c
> +++ b/drivers/target/tcm_fc/tfc_io.c
> @@ -154,9 +154,9 @@ int ft_queue_data_in(struct se_cmd *se_cmd)
> BUG_ON(!page);
> from = kmap_atomic(page + (mem_off >> PAGE_SHIFT));
> page_addr = from;
> - from += mem_off & ~PAGE_MASK;
> + from += offset_in_page(mem_off);
> tlen = min(tlen, (size_t)(PAGE_SIZE -
> - (mem_off & ~PAGE_MASK)));
> + offset_in_page(mem_off)));
> memcpy(to, from, tlen);
> kunmap_atomic(page_addr);
> to += tlen;
> @@ -314,9 +314,9 @@ void ft_recv_write_data(struct ft_cmd *cmd, struct fc_frame *fp)
>
> to = kmap_atomic(page + (mem_off >> PAGE_SHIFT));
> page_addr = to;
> - to += mem_off & ~PAGE_MASK;
> + to += offset_in_page(mem_off);
> tlen = min(tlen, (size_t)(PAGE_SIZE -
> - (mem_off & ~PAGE_MASK)));
> + offset_in_page(mem_off)));
> memcpy(to, from, tlen);
> kunmap_atomic(page_addr);
>

Applied to target-pending/for-next.

Thank you,

--nab