Re: [PATCH v4] ARM: Implement SLS mitigation

On Wed, Mar 3, 2021 at 4:29 PM David Laight [off-list ref] wrote:

quoted

On Tue, Feb 23, 2021 at 11:05 AM Will Deacon [off-list ref] wrote:

quoted

I wrote some suggestions on follow-ups in my reply, and I can
help out doing some of the patches, I think.

Since ARM32 RET is mov pc, <>
git grep 'mov.*pc,' | wc -l gives 93 sites in arch/arm.
I suppose these need to come out:

mov pc, lr
dsb(nsh);
isb();

Won't that go horribly wrong for conditional returns?

It will so I would not insert it after those. It has to be
on a case-by-base basis, I am not planning any
search and replace operations.

Yours,
Linus Walleij