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From: Sami Tolvanen <>
To: Mark Rutland <>
Cc: "Mohan Rao .vanimina" <>,
	Robin Murphy <>,
	 linux-arm-kernel <>,
	Kees Cook <>,
	 Nathan Chancellor <>,
	Will Deacon <>
Subject: Re: linker script /arch/arm64/kernel/ build error
Date: Tue, 20 Sep 2022 08:06:12 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <YymwCxtUNclGDxyZ@FVFF77S0Q05N>

On Tue, Sep 20, 2022 at 5:20 AM Mark Rutland <> wrote:
> On Thu, Sep 15, 2022 at 09:10:45PM +0530, Mohan Rao .vanimina wrote:
> > Thanks for the info. Sorry for this delay in the response.
> > As suggested I have modified the PAGE SIZE granularity from
> > ARM64_4K_PAGES to ARM64_64K_PAGES in the applicable config file but
> > still the build is failing with the same linker error.
> > Kindly note that the build compilation is successful for the case of
> > when configuring PAGE size to ARM64_16K_PAGES. Though there is some
> > issue that the device is crashing at bootup itself, compilation was
> > getting through without any issues for ARM64_16K_PAGES.
> > I wonder why the ARM64_64K_PAGES scenario is failing, there must be
> > some sanity checks at the build integration(kernel build tests) that
> > would have been caught this linker build issue if indeed it's really a
> > bug or failed due to some in-complete change.
> Since you're using LTO, your config is clearly divergent from defconfig; if you
> could share your config it would help a lot.
> I suspect what's happening here is exactly what the linker error describes:
> you're building a config without a PMD level (e.g. 64K pages with 42-bit VAs),
> but there's some code that blindly assumes the PMD level exists and depends on
> the non-existent PMD_SIZE definition.
> I suspect you've enabled CFI_CLANG, and the TEXT_CFI_JT section in the linker
> script, which would explain the problem.
> I don't understand why that's aligned to anything more than an instruction
> boundary to begin with. I don't see why it would need to be aligned to 2MB with
> 4K pages, nor with 512MB with 64K pages.
> Sami, Kees, Nathan, any idea on where this alignment came from?
> Will had mentioned this in passing before as bloating the kernel Image size,
> but I hadn't realsied this also caused a build failure until now.

This was a leftover from an old x86 series, which was included here by
mistake. Will also asked me about this a couple of weeks ago, I think,
and said he'd send a patch to remove it.


linux-arm-kernel mailing list

      reply	other threads:[~2022-09-20 15:08 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-06 18:13 linker script /arch/arm64/kernel/ build error Mohan Rao .vanimina
2022-09-07 10:30 ` Robin Murphy
2022-09-15 15:40   ` Mohan Rao .vanimina
2022-09-20 12:20     ` Mark Rutland
2022-09-20 15:06       ` Sami Tolvanen [this message]

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