From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Date: Tue, 26 Mar 2013 23:25:57 +0000 (+1100)
Subject: kexec: Use min() and min_t() to simplify logic
X-Git-Tag: next-20130404~3^2~120
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=24c2cff1165227c203bf312ded4d11049400a01a;p=karo-tx-linux.git

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

Simplify the logic of variable assignments.

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>
---

diff --git a/kernel/kexec.c b/kernel/kexec.c
index e1e5ce9bf53e..97096351de18 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -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,
+			       (size_t)(PAGE_SIZE - (maddr & ~PAGE_MASK)));
+		uchunk = min_t(size_t, 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,
+			       (size_t)(PAGE_SIZE - (maddr & ~PAGE_MASK)));
+		uchunk = min_t(size_t, ubytes, mchunk);
+		if (mchunk > uchunk) {
 			/* Zero the trailing part of the page */
 			memset(ptr + uchunk, 0, mchunk - uchunk);
 		}
@@ -1454,8 +1447,7 @@ 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_t(size_t, r, vmcoreinfo_max_size - vmcoreinfo_size);
 
 	memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);