[PATCH 05/12] ARM: kdump: advertise boot aliased crash kernel resource
From: Russell King <hidden>
Date: 2016-04-28 09:28:09
Also in:
kexec, linux-devicetree
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
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. Signed-off-by: Russell King <redacted> --- arch/arm/kernel/setup.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index d9317eec1eba..19b25ad61385 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c@@ -1003,9 +1003,25 @@ 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) {}
--
2.1.0