linux-kernel - Re: [PATCH 0/8] arm64: set VMAP

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Message-ID: <CAMj1kXEjgFarhn4FNOMfCfrh1_DR9L-MNZBiZq83pg2i=RE08A@mail.gmail.com>
Date: Tue, 8 Jul 2025 11:13:16 +1000
From: Ard Biesheuvel <ardb@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-efi@...r.kernel.org, leo.yan@....com, kernel-team@...a.com, 
	mark.rutland@....com
Subject: Re: [PATCH 0/8] arm64: set VMAP_STACK by default

On Tue, 8 Jul 2025 at 02:01, Breno Leitao <leitao@...ian.org> wrote:
>
> Hi all,
>
> This patchset select VMAP_STACK on arm64 by default, and cleans up the
> code by removing all associated CONFIG_VMAP_STACK conditionals.
>
> This is a suggestion from Will Deacon from another discussion[1].
>
> With VMAP_STACK now always enabled on arm64, the code can be
> significantly simplified, reducing complexity and potential for
> misconfiguration.
>
> Overview of Changes
>
>     * Remove all #ifdef CONFIG_VMAP_STACK and related runtime checks
>       throughout the architecture codebase.
>     * Replace runtime checks with build-time assertions where
>       appropriate.
>
> Link: https://lore.kernel.org/all/aGfYL8eXjTA9puQr@willie-the-truck/ [1]
>
> Signed-off-by: Breno Leitao <leitao@...ian.org>
> ---
> Breno Leitao (8):
>       arm64: Enable VMAP_STACK support
>       arm64: efi: Remove CONFIG_VMAP_STACK check
>       arm64: Remove CONFIG_VMAP_STACK conditionals from THREAD_SHIFT and THREAD_ALIGN
>       arm64: remove CONFIG_VMAP_STACK conditionals from irq stack setup
>       arm64: remove CONFIG_VMAP_STACK conditionals from traps overflow stack
>       arm64: remove CONFIG_VMAP_STACK checks from stacktrace overflow logic
>       arm64: remove CONFIG_VMAP_STACK checks from SDEI stack handling
>       arm64: remove CONFIG_VMAP_STACK checks from entry code
>

For the series,

Acked-by: Ard Biesheuvel <ardb@...nel.org>