[PATCH kexec-tools 05/32] arm: fix kdump to work on LPAE systems

Russell King rmk at arm.linux.org.uk
Tue May 3 03:21:28 PDT 2016

We need to use 64-bit file IO when mapping system memory and the core
dump file as we may be running on a LPAE system, otherwise we risk
mapping memory we shouldn't, and causing a kernel oops:

Unhandled fault: asynchronous external abort (0x211) at 0x00000000
pgd = edd2c740
[00000000] *pgd=82ec98003, *pmd=82dcd2003, *pte=00000000

Signed-off-by: Russell King <rmk at arm.linux.org.uk>
 kexec/arch/arm/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kexec/arch/arm/Makefile b/kexec/arch/arm/Makefile
index 38137d7..60e433a 100644
--- a/kexec/arch/arm/Makefile
+++ b/kexec/arch/arm/Makefile
@@ -18,6 +18,9 @@ libfdt_SRCS += $(LIBFDT_SRCS:%=kexec/libfdt/%)
 arm_CPPFLAGS = -I$(srcdir)/kexec/libfdt
+# We want 64-bit file IO for kdump to work correctly on LPAE systems
 arm_KEXEC_SRCS += $(libfdt_SRCS)
 arm_UIMAGE = kexec/kexec-uImage.c

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