linux-kernel - [PATCH] Use BOOTMEM_EXCLUSIVE for crashkernel reservation

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Message-ID: <20071019145220.GA14691@suse.de>
Date:	Fri, 19 Oct 2007 16:52:20 +0200
From:	Bernhard Walle <bwalle@...e.de>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linuxsh-dev@...ts.sourceforge.net,
	kexec@...ts.infradead.org
Subject: [PATCH] Use BOOTMEM_EXCLUSIVE for crashkernel reservation

This patch implements the usage of BOOTMEM_EXCLUSIVE for crashkernel
reservation on other architectures. The only architecture that applies
is sh.

The patch is based on current git tree plus
kexec-introduce-bootmem_exclusive.patch from -mm tree.


Signed-off-by: Bernhard Walle <bwalle@...e.de>

---
 arch/sh/kernel/setup.c |   29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -140,19 +140,26 @@ static void __init reserve_crashkernel(v
 	ret = parse_crashkernel(boot_command_line, free_mem,
 			&crash_size, &crash_base);
 	if (ret == 0 && crash_size) {
-		if (crash_base > 0) {
-			printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
-					"for crashkernel (System RAM: %ldMB)\n",
-					(unsigned long)(crash_size >> 20),
-					(unsigned long)(crash_base >> 20),
-					(unsigned long)(free_mem >> 20));
-			crashk_res.start = crash_base;
-			crashk_res.end   = crash_base + crash_size - 1;
-			reserve_bootmem(crash_base, crash_size,
-					BOOTMEM_DEFAULT);
-		} else
+		if (crash_base <= 0) {
 			printk(KERN_INFO "crashkernel reservation failed - "
 					"you have to specify a base address\n");
+			return;
+		}
+
+		if (reserve_bootmem(crash_base, crash_size,
+					BOOTMEM_EXCLUSIVE) < 0) {
+			printk(KERN_INFO "crashkernel reservation failed - "
+					"memory is in use\n");
+			return;
+		}
+
+		printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
+				"for crashkernel (System RAM: %ldMB)\n",
+				(unsigned long)(crash_size >> 20),
+				(unsigned long)(crash_base >> 20),
+				(unsigned long)(free_mem >> 20));
+		crashk_res.start = crash_base;
+		crashk_res.end   = crash_base + crash_size - 1;
 	}
 }
 #else
-
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