[PATCH 0/8] arm64: set VMAP_STACK by default
Mark Rutland
mark.rutland at arm.com
Mon Jul 7 10:25:57 PDT 2025
On Mon, Jul 07, 2025 at 09:01:00AM -0700, Breno Leitao 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 at debian.org>
Nice!
Aside from a minor comment on the first patch, this all looks good to
me. For the series:
Acked-by: Mark Rutland <mark.rutland at arm.com>
Mark.
> ---
> 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
>
> arch/arm64/Kconfig | 1 +
> arch/arm64/include/asm/memory.h | 6 +-----
> arch/arm64/include/asm/stacktrace.h | 6 +-----
> arch/arm64/kernel/efi.c | 5 -----
> arch/arm64/kernel/entry-common.c | 2 --
> arch/arm64/kernel/entry.S | 6 ------
> arch/arm64/kernel/irq.c | 13 -------------
> arch/arm64/kernel/sdei.c | 8 ++------
> arch/arm64/kernel/stacktrace.c | 4 +---
> arch/arm64/kernel/traps.c | 3 ---
> 10 files changed, 6 insertions(+), 48 deletions(-)
> ---
> base-commit: 9dd1757493416310a5e71146a08bc228869f8dae
> change-id: 20250707-arm64_vmap-fa70ba3c9cfb
>
> Best regards,
> --
> Breno Leitao <leitao at debian.org>
>
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