linux-kernel - [PATCH v7u1 27/31] x86, kdump: remove crashkernel range find limit for 64bit

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Message-Id: <1357260531-11115-28-git-send-email-yinghai@kernel.org>
Date:	Thu,  3 Jan 2013 16:48:47 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>, Jan Kiszka <jan.kiszka@....de>,
	Jason Wessel <jason.wessel@...driver.com>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH v7u1 27/31] x86, kdump: remove crashkernel range find limit for 64bit

Now kexeced kernel/ramdisk could be above 4g, so remove 896 limit for
64bit.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 arch/x86/kernel/setup.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index c58497e..6adbc45 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -501,13 +501,11 @@ static void __init memblock_x86_reserve_range_setup_data(void)
 /*
  * Keep the crash kernel below this limit.  On 32 bits earlier kernels
  * would limit the kernel to the low 512 MiB due to mapping restrictions.
- * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this
- * limit once kexec-tools are fixed.
  */
 #ifdef CONFIG_X86_32
 # define CRASH_KERNEL_ADDR_MAX	(512 << 20)
 #else
-# define CRASH_KERNEL_ADDR_MAX	(896 << 20)
+# define CRASH_KERNEL_ADDR_MAX	MAXMEM
 #endif
 
 static void __init reserve_crashkernel(void)
-- 
1.7.10.4

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