From: Roland McGrath <roland@redhat.com>
Date: Fri, 29 Sep 2006 09:00:39 +0000 (-0700)
Subject: [PATCH] kexec warning fix
X-Git-Tag: v2.6.19-rc1~737
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0b4a8a789a328af6aac613734c362cf6aad72201;p=linux-2.6

[PATCH] kexec warning fix

This fixes a couple of compiler warnings, and adds paranoia checks as well.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 37cad75cf4..fcdd5d2bc3 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -995,7 +995,8 @@ asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments,
 	image = xchg(dest_image, image);
 
 out:
-	xchg(&kexec_lock, 0); /* Release the mutex */
+	locked = xchg(&kexec_lock, 0); /* Release the mutex */
+	BUG_ON(!locked);
 	kimage_free(image);
 
 	return result;
@@ -1061,7 +1062,8 @@ void crash_kexec(struct pt_regs *regs)
 			machine_crash_shutdown(&fixed_regs);
 			machine_kexec(kexec_crash_image);
 		}
-		xchg(&kexec_lock, 0);
+		locked = xchg(&kexec_lock, 0);
+		BUG_ON(!locked);
 	}
 }