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arm64: remove CONFIG_VMAP_STACK checks from SDEI stack handling

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With VMAP_STACK now always enabled on arm64, remove all
CONFIG_VMAP_STACK conditionals from SDEI stack allocation and
initialization in arch/arm64/kernel/sdei.c.

This change unconditionally defines the SDEI stack pointers and replaces
runtime checks with BUILD_BUG_ON() assertions, ensuring that the code is
only built when VMAP_STACK is enabled. This simplifies the logic and
reflects the mandatory use of VMAP_STACK for all arm64 kernel builds.

Signed-off-by: Breno Leitao <leitao@debian.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20250707-arm64_vmap-v1-7-8de98ca0f91c@debian.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Breno Leitao 2025-07-07 09:01:07 -07:00 committed by Will Deacon
parent 907cb5cd8e
commit 3e72b9e9f0
1 changed files with 2 additions and 6 deletions
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8
arch/arm64/kernel/sdei.c
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@ -34,10 +34,8 @@ unsigned long sdei_exit_mode;
DECLARE_PER_CPU(unsigned long *, sdei_stack_normal_ptr);
DECLARE_PER_CPU(unsigned long *, sdei_stack_critical_ptr);
#ifdef CONFIG_VMAP_STACK
DEFINE_PER_CPU(unsigned long *, sdei_stack_normal_ptr);
DEFINE_PER_CPU(unsigned long *, sdei_stack_critical_ptr);
#endif
DECLARE_PER_CPU(unsigned long *, sdei_shadow_call_stack_normal_ptr);
DECLARE_PER_CPU(unsigned long *, sdei_shadow_call_stack_critical_ptr);
@ -65,8 +63,7 @@ static void free_sdei_stacks(void)
{
int cpu;
if (!IS_ENABLED(CONFIG_VMAP_STACK))
return;
BUILD_BUG_ON(!IS_ENABLED(CONFIG_VMAP_STACK));
for_each_possible_cpu(cpu) {
_free_sdei_stack(&sdei_stack_normal_ptr, cpu);
@ -91,8 +88,7 @@ static int init_sdei_stacks(void)
int cpu;
int err = 0;
if (!IS_ENABLED(CONFIG_VMAP_STACK))
return 0;
BUILD_BUG_ON(!IS_ENABLED(CONFIG_VMAP_STACK));
for_each_possible_cpu(cpu) {
err = _init_sdei_stack(&sdei_stack_normal_ptr, cpu);