Use BOOTMEM_EXCLUSIVE for kdump

Use the BOOTMEM_EXCLUSIVE, introduced in the previous patch, to avoid conflicts while reserving the memory for the kdump capture kernel (crashkernel=). Signed-off-by: Bernhard Walle <bwalle@suse.de> Cc: <linux-arch@vger.kernel.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@in.ibm.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
git-mirror · Feb 7, 2008 · 18a01a3 · 18a01a3
1 parent 72a7fe3
commit 18a01a3
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Showing 2 changed files with 39 additions and 26 deletions.
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
@@ -140,19 +140,26 @@ static void __init reserve_crashkernel(void)
 	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

diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
@@ -220,29 +220,35 @@ static inline void copy_edd(void)
 #ifdef CONFIG_KEXEC
 static void __init reserve_crashkernel(void)
 {
-	unsigned long long free_mem;
+	unsigned long long total_mem;
 	unsigned long long crash_size, crash_base;
 	int ret;
 
-	free_mem =
-		((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
+	total_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
 
-	ret = parse_crashkernel(boot_command_line, free_mem,
+	ret = parse_crashkernel(boot_command_line, total_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)(total_mem >> 20));
+		crashk_res.start = crash_base;
+		crashk_res.end   = crash_base + crash_size - 1;
 	}
 }
 #else