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From:   Will Deacon <will@kernel.org>
To:     linux-kernel@vger.kernel.org, Will Deacon <will@kernel.org>
Cc:     catalin.marinas@arm.com, kernel-team@android.com,
        Mark Rutland <mark.rutland@arm.com>,
        Nathan Chancellor <nathan@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        "Mohan Rao .vanimina" <mailtoc.mohanrao@gmail.com>,
        Sami Tolvanen <samitolvanen@google.com>,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] vmlinux.lds.h: CFI: Reduce alignment of jump-table to function alignment
Date:   Fri, 23 Sep 2022 16:40:48 +0100
Message-Id: <166393672765.2853144.1045935840794664678.b4-ty@kernel.org>
In-Reply-To: <20220922215715.13345-1-will@kernel.org>
References: <20220922215715.13345-1-will@kernel.org>
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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