[PATCH 0/8] arm64: set VMAP_STACK by default

[Breno Leitao]

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>
---
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>