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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>
This commit is contained in:
Zhang Yanfei 2013-02-27 17:03:17 -08:00 committed by Linus Torvalds
parent 87ebdc00ee
commit c2c1b089b4
1 changed files with 7 additions and 13 deletions
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20
fs/proc/vmcore.c
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@ -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;
}