linux-kernel - Re: [PATCH] vmlinux.lds.h: CFI: Reduce alignment of jump-table to function alignment

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Date:   Fri, 23 Sep 2022 16:40:48 +0100
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Mark Rutland <mark.rutland@....com>,
        Nathan Chancellor <nathan@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        "Mohan Rao .vanimina" <mailtoc.mohanrao@...il.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] vmlinux.lds.h: CFI: Reduce alignment of jump-table to function alignment

On Thu, 22 Sep 2022 22:57:15 +0100, Will Deacon wrote:
> Due to undocumented, hysterical raisins on x86, the CFI jump-table
> sections in .text are needlessly aligned to PMD_SIZE in the vmlinux
> linker script. When compiling a CFI-enabled arm64 kernel with a 64KiB
> page-size, a PMD maps 512MiB of virtual memory and so the .text section
> increases to a whopping 940MiB and blows the final Image up to 960MiB.
> Others report a link failure.
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] vmlinux.lds.h: CFI: Reduce alignment of jump-table to function alignment
      https://git.kernel.org/arm64/c/13b056696291

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev