linux-kernel - [PATCHv2] arch/arm/Kconfig: default ARM_MODULE

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Date:   Wed, 31 Jan 2018 21:19:11 +0100
From:   Anders Roxell <anders.roxell@...aro.org>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     linux@...linux.org.uk, arnd@...db.de,
        Anders Roxell <anders.roxell@...aro.org>
Subject: [PATCHv2] arch/arm/Kconfig: default ARM_MODULE_PLTS to 'y'

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.

Suggested-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
---
 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