From c2c1b089b44b783bd50fae4bccaa6f367f92e492 Mon Sep 17 00:00:00 2001
From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Date: Wed, 27 Feb 2013 17:03:17 -0800
Subject: [PATCH] fs/proc/vmcore.c: put if tests in the top of the while loop
to reduce duplication
In read_vmcore() two `if' tests are duplicated. Change the position of
them could reduce the duplication. This change does not affect the
behaviour of the function.
[akpm@linux-foundation.org: avoid `if (foo = bar)' thing, use min_t()]
[akpm@linux-foundation.org: s/max_t/min_t/]
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
fs/proc/vmcore.c | 20 +++++++-------------
1 file changed, 7 insertions(+), 13 deletions(-)
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 41dd018f72dd0..b870f740ab5a5 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -176,15 +176,15 @@ 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) {
+ tsz = min_t(size_t, buflen, PAGE_SIZE - (start & ~PAGE_MASK));
+
+ /* 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;
@@ -199,12 +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;
}
--
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