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kexec: Use min() and min_t() to simplify logic 

Simplify the logic of variable assignments.

[akpm@linux-foundation.org: replace min_t with min, remove unneeded casts]
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Reviewed-by: Simon Horman <horms@verge.net.au>
Cc: Joe Perches <joe@perches.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 2013-04-30 15:28:23 -07:00 committed by Linus Torvalds
parent 310faaa9b2
commit 31c3a3fe07
1 changed files with 8 additions and 16 deletions
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24
kernel/kexec.c
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@ -819,13 +819,9 @@ static int kimage_load_normal_segment(struct kimage *image,
/* Start with a clear page */
clear_page(ptr);
ptr += maddr & ~PAGE_MASK;
mchunk = PAGE_SIZE - (maddr & ~PAGE_MASK);
if (mchunk > mbytes)
mchunk = mbytes;
uchunk = mchunk;
if (uchunk > ubytes)
uchunk = ubytes;
mchunk = min_t(size_t, mbytes,
PAGE_SIZE - (maddr & ~PAGE_MASK));
uchunk = min(ubytes, mchunk);
result = copy_from_user(ptr, buf, uchunk);
kunmap(page);
@ -871,13 +867,10 @@ static int kimage_load_crash_segment(struct kimage *image,
}
ptr = kmap(page);
ptr += maddr & ~PAGE_MASK;
mchunk = PAGE_SIZE - (maddr & ~PAGE_MASK);
if (mchunk > mbytes)
mchunk = mbytes;
uchunk = mchunk;
if (uchunk > ubytes) {
uchunk = ubytes;
mchunk = min_t(size_t, mbytes,
PAGE_SIZE - (maddr & ~PAGE_MASK));
uchunk = min(ubytes, mchunk);
if (mchunk > uchunk) {
/* Zero the trailing part of the page */
memset(ptr + uchunk, 0, mchunk - uchunk);
}
@ -1546,8 +1539,7 @@ void vmcoreinfo_append_str(const char *fmt, ...)
r = vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
if (r + vmcoreinfo_size > vmcoreinfo_max_size)
r = vmcoreinfo_max_size - vmcoreinfo_size;
r = min(r, vmcoreinfo_max_size - vmcoreinfo_size);
memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);