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Subject[PATCH] fs/proc/vmcore.c: Put if tests in the top of the while loop to reduce duplication
From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>

In function read_vmcore, two if tests are duplicate. Change the position
of them could reduce the duplication. This change does not affect
the behaviour of the function.

Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
---
fs/proc/vmcore.c | 21 ++++++++-------------
1 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 0d5071d..c74a901 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -175,15 +175,16 @@ static ssize_t read_vmcore(struct file *file, char __user *buffer,
start = map_offset_to_paddr(*fpos, &vmcore_list, &curr_m);
if (!curr_m)
return -EINVAL;
- if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
- tsz = buflen;
-
- /* Calculate left bytes in current memory segment. */
- nr_bytes = (curr_m->size - (start - curr_m->paddr));
- if (tsz > nr_bytes)
- tsz = nr_bytes;

while (buflen) {
+ if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
+ tsz = buflen;
+
+ /* Calculate left bytes in current memory segment. */
+ nr_bytes = (curr_m->size - (start - curr_m->paddr));
+ if (tsz > nr_bytes)
+ tsz = nr_bytes;
+
tmp = read_from_oldmem(buffer, tsz, &start, 1);
if (tmp < 0)
return tmp;
@@ -198,12 +199,6 @@ static ssize_t read_vmcore(struct file *file, char __user *buffer,
struct vmcore, list);
start = curr_m->paddr;
}
- if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
- tsz = buflen;
- /* Calculate left bytes in current memory segment. */
- nr_bytes = (curr_m->size - (start - curr_m->paddr));
- if (tsz > nr_bytes)
- tsz = nr_bytes;
}
return acc;
}
--
1.7.1

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