[PATCH 5.4 297/344] ARM: 8951/1: Fix Kexec compilation issue.

From: Greg Kroah-Hartman
Date: Fri Feb 21 2020 - 03:15:50 EST


From: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>

[ 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 âreserve_crashkernelâ:
linux/arch/arm/kernel/setup.c:1016:25: error: âSECTION_SIZEâ undeclared
(first use in this function); did you mean âSECTIONS_WIDTHâ?
crash_size, SECTION_SIZE);
^~~~~~~~~~~~
SECTIONS_WIDTH
linux/arch/arm/kernel/setup.c:1016:25: note: each undeclared identifier
is reported only once for each function it appears in
linux/scripts/Makefile.build:265: recipe for target 'arch/arm/kernel/setup.o'
failed

Make KEXEC depend on MMU to fix the compilation issue.

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
arch/arm/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 9fadf322a2b76..05c9bbfe444df 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1907,7 +1907,7 @@ config XIP_DEFLATED_DATA
config KEXEC
bool "Kexec system call (EXPERIMENTAL)"
depends on (!SMP || PM_SLEEP_SMP)
- depends on !CPU_V7M
+ depends on MMU
select KEXEC_CORE
help
kexec is a system call that implements the ability to shutdown your
--
2.20.1