linux-kernel - Re: [RESEND PATCH v5] arm64: Enable vmalloc-huge with ptdump

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Message-ID: <aM0F8U-cW6sh62H-@willie-the-truck>
Date: Fri, 19 Sep 2025 08:27:45 +0100
From: Will Deacon <will@...nel.org>
To: Dev Jain <dev.jain@....com>
Cc: catalin.marinas@....com, anshuman.khandual@....com,
	quic_zhenhuah@...cinc.com, ryan.roberts@....com,
	kevin.brodsky@....com, yangyicong@...ilicon.com, joey.gouly@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	david@...hat.com, mark.rutland@....com, urezki@...il.com,
	jthoughton@...gle.com
Subject: Re: [RESEND PATCH v5] arm64: Enable vmalloc-huge with ptdump

Dev,

On Wed, Sep 17, 2025 at 04:43:00PM +0100, Will Deacon wrote:
> On Tue, Sep 16, 2025 at 11:30:26AM +0100, Will Deacon wrote:
> > I'm currently trying to put together a litmus test with James (cc'd) so
> > maybe we can help you out with that part.
> 
> Here's what we came up with. There's not a good way to express the IPI
> from kick_all_cpus_sync() but it turns out that the ISB from the TLB
> invalidation is sufficient anyway. Does it make sense to you?

Any comments on the litmus test and/or my question about serialisation
of the static key? I'll be moving the arm64 tree to "fixes only" soon
as far as 6.18 is concerned.

Will