[PATCH] arm: add an option for erratum 657417

[Russell King - ARM Linux]

On Fri, Aug 12, 2016 at 03:49:15PM +0200, Ard Biesheuvel wrote:
> We could enable CONFIG_ARM_MODULE_PLTS in this case, and force a
> branch via a PLT entry if an affected instruction is encountered.
> However, this only covers branch instructions that are covered by
> relocations, so we'd still need to scan the module .text to look for
> affected instructions whose targets has been resolved at compile time.

Only if it's combined with detecting which regions of the .text section
are really instructions - just looking for something that appears to be
a branch instruction will be unreliable as the .text contains literal
data, and literal data could look like a branch instruction.

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