linux-arm-kernel.lists.infradead.org archive mirror
 help / color / mirror / Atom feed
From: Ard Biesheuvel <ardb@kernel.org>
To: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com,
	 james.morse@arm.com, joey.gouly@arm.com, maz@kernel.org,
	will@kernel.org
Subject: Re: [PATCH 5/9] arm64: alternatives: make alt_region const
Date: Mon, 12 Sep 2022 11:13:12 +0100	[thread overview]
Message-ID: <CAMj1kXEOx5MRkiafLyd+kOesrK125tt3CFBofq30NqVGLp_2JQ@mail.gmail.com> (raw)
In-Reply-To: <Yx78izHqzRZLlCeA@FVFF77S0Q05N>

On Mon, 12 Sept 2022 at 10:32, Mark Rutland <mark.rutland@arm.com> wrote:
>
> On Tue, Sep 06, 2022 at 05:18:54PM +0200, Ard Biesheuvel wrote:
> > Hi Mark,
> >
> > On Thu, 1 Sept 2022 at 17:14, Mark Rutland <mark.rutland@arm.com> wrote:
> > >
> > > We never alter a struct alt_region after creation, and we open-code the
> > > bounds of the kernel alternatives region in two functions.
> > >
> > > This patch adds a shared struct alt_region, and marks the alt regions as
> > > const to prevent unintentional modification.
> > >
> >
> > What is the point of struct alt_region? Can we just get rid of it
> > entirely? It seems its only purpose is to carry a <start, end> tuple
> > that could easily be converted into start and end arguments to
> > __apply_alternatives().
>
> We could right now, but I'm intending to fix some noinstr issues (and make
> debugging easier) by splitting the alternatives sanity-checking & patching into
> distinct initcalls (alnog with some extra debug), and having the structure for
> the common definition is quite nice to avoid open-coding the start and end
> value in a bunch of places.
>
> So I'd prefer to keep it for now, but I can follow up and delete it if the
> above doesn't turn out to need it, if that's ok?
>

Yeah, that's fine. The above wasn't really clear to me from the
context you provided.

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2022-09-12 10:27 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-01 15:13 [PATCH 0/9] arm64: alternatives: improvements Mark Rutland
2022-09-01 15:13 ` [PATCH 1/9] arm64: cpufeature: make cpus_have_cap() noinstr-safe Mark Rutland
2022-09-01 15:13 ` [PATCH 2/9] arm64: alternatives: kvm: prepare for cap changes Mark Rutland
2022-09-01 15:13 ` [PATCH 3/9] arm64: alternatives: proton-pack: " Mark Rutland
2022-09-02 16:19   ` Joey Gouly
2022-09-05  8:46     ` Mark Rutland
2022-09-01 15:13 ` [PATCH 4/9] arm64: alternatives: hoist print out of __apply_alternatives() Mark Rutland
2022-09-01 15:13 ` [PATCH 5/9] arm64: alternatives: make alt_region const Mark Rutland
2022-09-06 15:18   ` Ard Biesheuvel
2022-09-12  9:31     ` Mark Rutland
2022-09-12 10:13       ` Ard Biesheuvel [this message]
2022-09-12 12:13         ` Mark Rutland
2022-09-01 15:14 ` [PATCH 6/9] arm64: alternatives: have callbacks take a cap Mark Rutland
2022-09-02 15:54   ` Joey Gouly
2022-09-05  8:48     ` Mark Rutland
2022-09-01 15:14 ` [PATCH 7/9] arm64: alternatives: add alternative_has_feature_*() Mark Rutland
2022-09-01 15:14 ` [PATCH 8/9] arm64: alternatives: add shared NOP callback Mark Rutland
2022-09-01 15:14 ` [PATCH 9/9] HACK: arm64: alternatives: dump summary of alternatives Mark Rutland
2022-09-12 12:36   ` Mark Brown
2022-09-12 16:14     ` Mark Rutland

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CAMj1kXEOx5MRkiafLyd+kOesrK125tt3CFBofq30NqVGLp_2JQ@mail.gmail.com \
    --to=ardb@kernel.org \
    --cc=catalin.marinas@arm.com \
    --cc=james.morse@arm.com \
    --cc=joey.gouly@arm.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=mark.rutland@arm.com \
    --cc=maz@kernel.org \
    --cc=will@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).