Commit e7229f7d authored Mar 26, 2018 by Anders Roxell Committed by Russell King May 19, 2018

ARM: 8752/1: Kconfig: default ARM_MODULE_PLTS to 'y'



While testing multi_v7_defconfig with config fragments that makes the
kernel size to grow. The kernel fails to load simple modules, as
reported by kselftest:

[   34.107620] test_printf: section 4 reloc 2 sym 'memset': relocation
28 out of range (0xbf046044 -> 0xc109f720)
selftests: printf.sh [FAIL]

The problem that is seen when enabling too much in the kernel without
enabling ARM_MODULE_PLTS, is that the top of the kernel gets out of
reach from the bottom of the module area.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

parent 60cc43fc

arch/arm/Kconfig

+3 −1

Original line number	Diff line number	Diff line
		@@ -1704,6 +1704,7 @@ config ARCH_WANT_GENERAL_HUGETLB
		config ARM_MODULE_PLTS
		bool "Use PLTs to allow module memory to spill over into vmalloc area"
		depends on MODULES
		default y
		help
		Allocate PLTs when loading modules so that jumps and calls whose
		targets are too far away for their relative offsets to be encoded
		@@ -1714,7 +1715,8 @@ config ARM_MODULE_PLTS
		rounding up to page size, the actual memory footprint is usually
		the same.

		Say y if you are getting out of memory errors while loading modules
		Disabling this is usually safe for small single-platform
		configurations. If unsure, say y.

		source "mm/Kconfig"