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| author | Zhang Yanfei <zhangyanfei@cn.fujitsu.com> | 2013-02-27 17:03:17 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-27 19:10:11 -0800 |
| commit | c2c1b089b44b783bd50fae4bccaa6f367f92e492 (patch) | |
| tree | 222677ea402d630ca50416dc76f9ae187d7f7acc /fs/proc/vmcore.c | |
| parent | 87ebdc00eeb474615496d5f10eed46709e25c707 (diff) | |
| download | lwn-c2c1b089b44b783bd50fae4bccaa6f367f92e492.tar.gz lwn-c2c1b089b44b783bd50fae4bccaa6f367f92e492.zip | |
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>
Diffstat (limited to 'fs/proc/vmcore.c')
| -rw-r--r-- | fs/proc/vmcore.c | 20 |
1 files changed, 7 insertions, 13 deletions
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c index 41dd018f72dd..b870f740ab5a 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; } |