[PATCH v1] bitmap: Drop unnecessary 0 check for u32 array operations

[PATCH v1] bitmap: Drop unnecessary 0 check for u32 array operations

[Andy Shevchenko]

The nbits == 0 is safe to be supplied to the function body, so,
remove unnecessary checks in bitmap_to_arr32() and bitmap_from_arr32().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 lib/bitmap.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/lib/bitmap.c b/lib/bitmap.c
index 58f9750e49c6..33e95cd359a2 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -1132,14 +1132,10 @@ EXPORT_SYMBOL(bitmap_copy_le);
  *	@buf: array of u32 (in host byte order), the source bitmap
  *	@nbits: number of bits in @bitmap
  */
-void bitmap_from_arr32(unsigned long *bitmap, const u32 *buf,
-						unsigned int nbits)
+void bitmap_from_arr32(unsigned long *bitmap, const u32 *buf, unsigned int nbits)
 {
 	unsigned int i, halfwords;
 
-	if (!nbits)
-		return;
-
 	halfwords = DIV_ROUND_UP(nbits, 32);
 	for (i = 0; i < halfwords; i++) {
 		bitmap[i/2] = (unsigned long) buf[i];
@@ -1163,9 +1159,6 @@ void bitmap_to_arr32(u32 *buf, const unsigned long *bitmap, unsigned int nbits)
 {
 	unsigned int i, halfwords;
 
-	if (!nbits)
-		return;
-
 	halfwords = DIV_ROUND_UP(nbits, 32);
 	for (i = 0; i < halfwords; i++) {
 		buf[i] = (u32) (bitmap[i/2] & UINT_MAX);
-- 
2.17.0

Re: [PATCH v1] bitmap: Drop unnecessary 0 check for u32 array operations

[Yury Norov]

On Thu, May 31, 2018 at 04:19:14PM +0300, Andy Shevchenko wrote:
> The nbits == 0 is safe to be supplied to the function body, so,
> remove unnecessary checks in bitmap_to_arr32() and bitmap_from_arr32().
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Indeed. Thanks for the catch.

> ---
>  lib/bitmap.c | 9 +--------
>  1 file changed, 1 insertion(+), 8 deletions(-)
> 
> diff --git a/lib/bitmap.c b/lib/bitmap.c
> index 58f9750e49c6..33e95cd359a2 100644
> --- a/lib/bitmap.c
> +++ b/lib/bitmap.c
> @@ -1132,14 +1132,10 @@ EXPORT_SYMBOL(bitmap_copy_le);
>   *	@buf: array of u32 (in host byte order), the source bitmap
>   *	@nbits: number of bits in @bitmap
>   */
> -void bitmap_from_arr32(unsigned long *bitmap, const u32 *buf,
> -						unsigned int nbits)
> +void bitmap_from_arr32(unsigned long *bitmap, const u32 *buf, unsigned int nbits)

This line is 81 characters length, and it will trigger checkpatch warning.
(But I'm OK with it.)

>  {
>  	unsigned int i, halfwords;
>  
> -	if (!nbits)
> -		return;
> -
>  	halfwords = DIV_ROUND_UP(nbits, 32);
>  	for (i = 0; i < halfwords; i++) {
>  		bitmap[i/2] = (unsigned long) buf[i];
> @@ -1163,9 +1159,6 @@ void bitmap_to_arr32(u32 *buf, const unsigned long *bitmap, unsigned int nbits)
>  {
>  	unsigned int i, halfwords;
>  
> -	if (!nbits)
> -		return;
> -
>  	halfwords = DIV_ROUND_UP(nbits, 32);
>  	for (i = 0; i < halfwords; i++) {
>  		buf[i] = (u32) (bitmap[i/2] & UINT_MAX);
> -- 
> 2.17.0

Acked-by: Yury Norov <ynorov@caviumnetworks.com>

Re: [PATCH v1] bitmap: Drop unnecessary 0 check for u32 array operations

[Andy Shevchenko]

On Thu, May 31, 2018 at 5:47 PM, Yury Norov <ynorov@caviumnetworks.com> wrote:
> On Thu, May 31, 2018 at 04:19:14PM +0300, Andy Shevchenko wrote:
>> The nbits == 0 is safe to be supplied to the function body, so,
>> remove unnecessary checks in bitmap_to_arr32() and bitmap_from_arr32().

>> +void bitmap_from_arr32(unsigned long *bitmap, const u32 *buf, unsigned int nbits)
>
> This line is 81 characters length, and it will trigger checkpatch warning.
> (But I'm OK with it.)

I really don't care about ) at the end potentially not visible on the
screen (who is using nice old hardware terminals? :-) ).

> Acked-by: Yury Norov <ynorov@caviumnetworks.com>

Thanks.

-- 
With Best Regards,
Andy Shevchenko