Re: [PATCH v2 08/18] arm64: don't disable ADR_PREL_PG_HI21* with ARM64_ERRATUM_843419

From: Sami Tolvanen
Date: Thu Nov 16 2017 - 11:33:07 EST

On Thu, Nov 16, 2017 at 11:44:06AM +0000, Will Deacon wrote:
> Right, and this would also mean that we silently load vulnerable
> modules that are linked with either LD that doesn't support
> --fix-cortex-a53-843419 or simply wasn't passed.

You'll see a warning at least if the linker doesn't support the flag,
but yes, you're correct. In v1 of this patch set, LTO depended on this
erratum not being selected, but I changed it in v2 based on Ard's

I'm fine with not being able to use LTO on devices that are affected
by this erratum, so either option works for me. I can even change
this so the user must explicitly disable the erratum in order to use
LTO. Thoughts?