From mboxrd@z Thu Jan 1 00:00:00 1970 From: Amerigo Wang Date: Fri, 04 Sep 2009 10:08:35 +0000 Subject: [Patch 1/8] x86: add CONFIG_KEXEC_AUTO_RESERVE Message-Id: <20090904101102.5220.52114.sendpatchset@localhost.localdomain> List-Id: References: <20090904101047.5220.20618.sendpatchset@localhost.localdomain> In-Reply-To: <20090904101047.5220.20618.sendpatchset@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-kernel@vger.kernel.org Cc: Anton Vorontsov , tony.luck@intel.com, linux-ia64@vger.kernel.org, Neil Horman , "Eric W. Biederman" , Andi Kleen , Ingo Molnar , Michael Ellerman , "M. Mohan Kumar" , akpm@linux-foundation.org, bernhard.walle@gmx.de, Fenghua Yu , kamezawa.hiroyu@jp.fujitsu.com, Amerigo Wang Introduce a new config option KEXEC_AUTO_RESERVE for x86. Signed-off-by: WANG Cong Acked-by: Neil Horman --- Index: linux-2.6/arch/x86/Kconfig =================================--- linux-2.6.orig/arch/x86/Kconfig +++ linux-2.6/arch/x86/Kconfig @@ -1482,6 +1482,19 @@ config KEXEC support. As of this writing the exact hardware interface is strongly in flux, so no good recommendation can be made. +config KEXEC_AUTO_RESERVE + bool "automatically reserve memory for kexec kernel" + depends on KEXEC + default y + ---help--- + Automatically reserve memory for a kexec kernel, so that you don't + need to specify numbers for the "crashkernel=X@Y" boot option, + instead you can use "crashkernel=auto". To make this work, you need + to have more than 4G memory. + + On x86_32, 128M is reserved, on x86_64 1/32 of your memory is + reserved, but it will not exceed 4G. + config CRASH_DUMP bool "kernel crash dumps" depends on X86_64 || (X86_32 && HIGHMEM)