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Commit 58557e48 authored by Florian Fainelli's avatar Florian Fainelli Committed by Catalin Marinas
Browse files

arm64: Allow user selection of ARM64_MODULE_PLTS 



Make ARM64_MODULE_PLTS a selectable Kconfig symbol, since some people
might have very big modules spilling out of the dedicated module area
into vmalloc. Help text is copied from the ARM 32-bit counterpart and
modified to a mention of KASLR and specific ARM errata workaround(s).

Acked-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 2af22f3e

arch/arm64/Kconfig

+16 −1
Original line number Diff line number Diff line
@@ -1418,8 +1418,23 @@ config ARM64_SVE 
	  KVM in the same kernel image.



config ARM64_MODULE_PLTS

	bool

	bool "Use PLTs to allow module memory to spill over into vmalloc area"

	select HAVE_MOD_ARCH_SPECIFIC

	help

	  Allocate PLTs when loading modules so that jumps and calls whose

	  targets are too far away for their relative offsets to be encoded

	  in the instructions themselves can be bounced via veneers in the

	  module's PLT. This allows modules to be allocated in the generic

	  vmalloc area after the dedicated module memory area has been

	  exhausted.



	  When running with address space randomization (KASLR), the module

	  region itself may be too far away for ordinary relative jumps and

	  calls, and so in that case, module PLTs are required and cannot be

	  disabled.



	  Specific errata workaround(s) might also force module PLTs to be

	  enabled (ARM64_ERRATUM_843419).



config ARM64_PSEUDO_NMI

	bool "Support for NMI-like interrupts"