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: Will Deacon <will.deacon@arm.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 57b02d4..22f8e6b 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -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"