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Commit f7f0b7dc authored by Russell King's avatar Russell King Committed by Linus Torvalds
Browse files

ARM: kdump: advertise boot aliased crash kernel resource 

Advertise a resource which describes where the crash kernel is located
in the boot view of RAM.  This allows kexec-tools to have this vital
information.

Link: http://lkml.kernel.org/r/E1b8knz-0004H4-Bd@rmk-PC.armlinux.org.uk


Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Cc: Baoquan He <bhe@redhat.com>
Cc: Keerthy <j-keerthy@ti.com>
Cc: Pratyush Anand <panand@redhat.com>
Cc: Vitaly Andrianov <vitalya@ti.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Simon Horman <horms@verge.net.au>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4caf9615

arch/arm/kernel/setup.c

+16 −0
Original line number Diff line number Diff line
@@ -1000,9 +1000,25 @@ static void __init reserve_crashkernel(void) 
		(unsigned long)(crash_base >> 20),

		(unsigned long)(total_mem >> 20));



	/* The crashk resource must always be located in normal mem */

	crashk_res.start = crash_base;

	crashk_res.end = crash_base + crash_size - 1;

	insert_resource(&iomem_resource, &crashk_res);



	if (arm_has_idmap_alias()) {

		/*

		 * If we have a special RAM alias for use at boot, we

		 * need to advertise to kexec tools where the alias is.

		 */

		static struct resource crashk_boot_res = {

			.name = "Crash kernel (boot alias)",

			.flags = IORESOURCE_BUSY | IORESOURCE_MEM,

		};



		crashk_boot_res.start = phys_to_idmap(crash_base);

		crashk_boot_res.end = crashk_boot_res.start + crash_size - 1;

		insert_resource(&iomem_resource, &crashk_boot_res);

	}

}

#else

static inline void reserve_crashkernel(void) {}