[PATCHv2] arch/arm/Kconfig: default ARM_MODULE_PLTS to 'y'
From: arnd@arndb.de (Arnd Bergmann)
Date: 2018-01-31 20:24:30
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lkml
On Wed, Jan 31, 2018 at 9:19 PM, Anders Roxell [off-list ref] wrote:
While testing multi_v7_defconfig with LOCKDEP enabled, 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 LOCKDEP is enabled without ARM_MODULE_PLTS, is that LOCKDEP eats so much memory that the top of the kernel gets out of reach from the bottom of the module area.
I think we could still use a better explanation here, as Russell said anything
could cause the size to grow too much, it's just that you happened to run into
it through lockdep, which can cause a very significant growth.
Arnd
quoted hunk ↗ jump to hunk
Suggested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Anders Roxell <redacted> --- arch/arm/Kconfig | 1 + 1 file changed, 1 insertion(+)diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 51c8df561077..8014c8c322df 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig@@ -1702,6 +1702,7 @@ 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 --2.11.0