Oct 08 2014

staging: lustre: lustre: llite: use DIV_ROUND_UP 

Author: Tapasweni Pathak <tapaswenipathak@gmail.com>

The kernel.h macro DIV_ROUND_UP performs the computation (((n) + (d) - 1) /
(d)) but is perhaps more readable.

Coccinelle script used :

// 
@haskernel@
@@
@depends on haskernel@
expression n,d;
@@
(
- (n + d - 1) / d
+ DIV_ROUND_UP(n,d)
|
- (n + (d - 1)) / d
+ DIV_ROUND_UP(n,d)
)
@depends on haskernel@
expression n,d;
@@
- DIV_ROUND_UP((n),d)
+ DIV_ROUND_UP(n,d)
@depends on haskernel@
expression n,d;
@@
- DIV_ROUND_UP(n,(d))
+ DIV_ROUND_UP(n,d)
// 

Signed-off-by: Tapasweni Pathak 
Signed-off-by: Greg Kroah-Hartman 

---
 drivers/staging/lustre/lustre/llite/rw26.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/drivers/staging/lustre/lustre/llite/rw26.c b/drivers/staging/lustre/lustre/llite/rw26.c
index 4c77ae8..eac2131 100644
--- a/drivers/staging/lustre/lustre/llite/rw26.c
+++ b/drivers/staging/lustre/lustre/llite/rw26.c
@@ -417,7 +417,7 @@ static ssize_t ll_direct_IO_26(int rw, struct kiocb *iocb,
 
 		result = iov_iter_get_pages_alloc(iter, &pages, count, &offs);
 		if (likely(result > 0)) {
-			int n = (result + offs + PAGE_SIZE - 1) / PAGE_SIZE;
+			int n = DIV_ROUND_UP(result + offs, PAGE_SIZE);
 			result = ll_direct_IO_26_seg(env, io, rw, inode,
 						     file->f_mapping,
 						     result, file_offset,

qlambert