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From: Zhang Yanfei <zhangyanfei.yes@gmail.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Simon Horman <horms@verge.net.au>
Cc: "kexec@lists.infradead.org" <kexec@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH v2] kexec: Use min_t to simplify logic
Date: Sun, 24 Feb 2013 22:37:21 +0800	[thread overview]
Message-ID: <512A25A1.4040002@gmail.com> (raw)

From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>

This is just a tweak: using min_t to simplify logic of variable
assignments.

v2:
- Rewrite patch description as Simon suggested.
- Fix an inappropriate if test introduced by v1. Thanks Simon.

Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Simon Horman <horms@verge.net.au>
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
---
 kernel/kexec.c |   22 ++++++----------------
 1 files changed, 6 insertions(+), 16 deletions(-)

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 2436ffc..effd655 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -822,13 +822,8 @@ 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_t(size_t, ubytes, mchunk);
 
 		result = copy_from_user(ptr, buf, uchunk);
 		kunmap(page);
@@ -874,13 +869,9 @@ 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_t(size_t, ubytes, mchunk);
+		if (mchunk > uchunk) {
 			/* Zero the trailing part of the page */
 			memset(ptr + uchunk, 0, mchunk - uchunk);
 		}
@@ -1461,8 +1452,7 @@ 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);
 
-- 
1.7.1

_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

WARNING: multiple messages have this Message-ID (diff)
From: Zhang Yanfei <zhangyanfei.yes@gmail.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Simon Horman <horms@verge.net.au>
Cc: "kexec@lists.infradead.org" <kexec@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH v2] kexec: Use min_t to simplify logic
Date: Sun, 24 Feb 2013 22:37:21 +0800	[thread overview]
Message-ID: <512A25A1.4040002@gmail.com> (raw)

From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>

This is just a tweak: using min_t to simplify logic of variable
assignments.

v2:
- Rewrite patch description as Simon suggested.
- Fix an inappropriate if test introduced by v1. Thanks Simon.

Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Simon Horman <horms@verge.net.au>
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
---
 kernel/kexec.c |   22 ++++++----------------
 1 files changed, 6 insertions(+), 16 deletions(-)

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 2436ffc..effd655 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -822,13 +822,8 @@ 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_t(size_t, ubytes, mchunk);
 
 		result = copy_from_user(ptr, buf, uchunk);
 		kunmap(page);
@@ -874,13 +869,9 @@ 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_t(size_t, ubytes, mchunk);
+		if (mchunk > uchunk) {
 			/* Zero the trailing part of the page */
 			memset(ptr + uchunk, 0, mchunk - uchunk);
 		}
@@ -1461,8 +1452,7 @@ 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);
 
-- 
1.7.1

             reply	other threads:[~2013-02-24 14:37 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-24 14:37 Zhang Yanfei [this message]
2013-02-24 14:37 ` [PATCH v2] kexec: Use min_t to simplify logic Zhang Yanfei
2013-02-25  0:36 ` Simon Horman
2013-02-25  0:36   ` Simon Horman
2013-02-25 23:35   ` Andrew Morton
2013-02-25 23:35     ` Andrew Morton
2013-02-25 23:59     ` Simon Horman
2013-02-25 23:59       ` Simon Horman
2013-02-26  4:44     ` Zhang Yanfei
2013-02-26  4:44       ` Zhang Yanfei

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