Re: [PATCH 7/8 v1.5] arm64: Always keep DAIF.[IF] in sync

On Tue, Feb 23, 2021 at 02:39:11AM +0900, Hector Martin wrote:

On 20/02/2021 03.26, Mark Rutland wrote:

quoted

On Sat, Feb 20, 2021 at 02:25:30AM +0900, Hector Martin wrote:

quoted

Apple SoCs (A11 and newer) have some interrupt sources hardwired to the
FIQ line. We implement support for this by simply treating IRQs and FIQs
the same way in the interrupt vectors.

To support these systems, the FIQ mask bit needs to be kept in sync with
the IRQ mask bit, so both kinds of exceptions are masked together. No
other platforms should be delivering FIQ exceptions right now, and we
already unmask FIQ in normal process context, so this should not have an
effect on other systems - if spurious FIQs were arriving, they would
already panic the kernel.

This looks good to me; I've picked this up and pushed out my arm64/fiq
branch [1,2] incorporating this, tagged as arm64-fiq-20210219.

I'll give this version a few days to gather comments before I post a v2.

[1] git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/fiq
[2] https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/log/?h=arm64/fiqA

Thanks! Any chance you can do a rebase on top of torvalds/master? Since
Marc's nVHE changes went in, we're going to need to add a workaround patch
for the M1's lack of nVHE mode, which is going to be in the next version of
my M1 bringup series - but right now that would involve telling people to
merge two trees to build a base to apply it on, which is sub-optimal.

I generally try to base on a stable tag/commit, so I'd prefer to avoid
rebasing the development branch until rc1 if possible. I've pushed out a
new arm64-fiq-mainline-20210222 tag rebased atop torvalds/master:

git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64-fiq-mainline-20210222
https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/tag/?h=arm64-fiq-mainline-20210222

... leaving the main branch atop v5.11. Is that good enough for now? If
that's painful for development I can shuffle the main branch along too.

Thanks,
Mark.

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