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Subject[PATCH 4.9 097/165] ARM: 8951/1: Fix Kexec compilation issue.
From: Vincenzo Frascino <>

[ Upstream commit 76950f7162cad51d2200ebd22c620c14af38f718 ]

To perform the reserve_crashkernel() operation kexec uses SECTION_SIZE to
find a memblock in a range.
SECTION_SIZE is not defined for nommu systems. Trying to compile kexec in
these conditions results in a build error:

linux/arch/arm/kernel/setup.c: In function ‘reserve_crashkernel’:
linux/arch/arm/kernel/setup.c:1016:25: error: ‘SECTION_SIZE’ undeclared
(first use in this function); did you mean ‘SECTIONS_WIDTH’?
crash_size, SECTION_SIZE);
linux/arch/arm/kernel/setup.c:1016:25: note: each undeclared identifier
is reported only once for each function it appears in
linux/scripts/ recipe for target 'arch/arm/kernel/setup.o'

Make KEXEC depend on MMU to fix the compilation issue.

Signed-off-by: Vincenzo Frascino <>
Signed-off-by: Russell King <>
Signed-off-by: Sasha Levin <>
arch/arm/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 74a70f91b01a4..56bd9beb6a35c 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -2020,7 +2020,7 @@ config XIP_PHYS_ADDR
config KEXEC
bool "Kexec system call (EXPERIMENTAL)"
depends on (!SMP || PM_SLEEP_SMP)
- depends on !CPU_V7M
+ depends on MMU
kexec is a system call that implements the ability to shutdown your

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