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

On 16 November 2017 at 16:32, Sami Tolvanen [off-list ref] wrote:

On Thu, Nov 16, 2017 at 11:44:06AM +0000, Will Deacon wrote:

quoted

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
suggestion.

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?

You still have not explained to us how GOLD avoids the erratum.