linux-kernel - [PATCH 2/5] kexec: Simplify conditional

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Message-Id: <5a3bbdeb26cd8891f2b9de1ce05dbacfc282f7d1.1408731991.git.geoff@infradead.org>
Date:	Fri, 22 Aug 2014 18:39:47 +0000
From:	Geoff Levand <geoff@...radead.org>
To:	Eric Biederman <ebiederm@...ssion.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	kexec@...ts.infradead.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] kexec: Simplify conditional

Simplify the code around one of the conditionals in the kexec_load
syscall routine.

The original code was confusing with a redundant check on KEXEC_ON_CRASH
and comments outside of the conditional block.  This change switches the
order of the conditional check, and cleans up the comments for the
conditional.  There is no functional change to the code.

Signed-off-by: Geoff Levand <geoff@...radead.org>
---
 kernel/kexec.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 0b49a0a..d04b56e 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1282,19 +1282,22 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
 	if (nr_segments > 0) {
 		unsigned long i;
 
-		/* Loading another kernel to reboot into */
-		if ((flags & KEXEC_ON_CRASH) == 0)
-			result = kimage_alloc_init(&image, entry, nr_segments,
-						   segments, flags);
-		/* Loading another kernel to switch to if this one crashes */
-		else if (flags & KEXEC_ON_CRASH) {
-			/* Free any current crash dump kernel before
+		if (flags & KEXEC_ON_CRASH) {
+			/*
+			 * Loading another kernel to switch to if this one
+			 * crashes.  Free any current crash dump kernel before
 			 * we corrupt it.
 			 */
+
 			kimage_free(xchg(&kexec_crash_image, NULL));
 			result = kimage_alloc_init(&image, entry, nr_segments,
 						   segments, flags);
 			crash_map_reserved_pages();
+		} else {
+			/* Loading another kernel to reboot into. */
+
+			result = kimage_alloc_init(&image, entry, nr_segments,
+						   segments, flags);
 		}
 		if (result)
 			goto out;
-- 
1.9.1


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