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arm64: Remove CONFIG_VMAP_STACK conditionals from THREAD_SHIFT and THREAD_ALIGN

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Now that VMAP_STACK is always enabled on arm64, remove the
CONFIG_VMAP_STACK conditional logic from the definitions of THREAD_SHIFT
and THREAD_ALIGN in arch/arm64/include/asm/memory.h. This simplifies the
code by unconditionally setting THREAD_ALIGN to (2 * THREAD_SIZE) and
adjusting the THREAD_SHIFT definition to only depend on MIN_THREAD_SHIFT
and PAGE_SHIFT.

This change reflects the updated arm64 stack model, where all kernel
threads use virtually mapped stacks with guard pages, and ensures
alignment and stack sizing are consistently handled.

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-v1-3-8de98ca0f91c@debian.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Breno Leitao
2025-07-07 09:01:03 -07:00
committed by Will Deacon
parent 63829521a8
commit 0909c719c1
1 changed files with 1 additions and 5 deletions
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6
arch/arm64/include/asm/memory.h
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@@ -118,7 +118,7 @@
* VMAP'd stacks are allocated at page granularity, so we must ensure that such
* stacks are a multiple of page size.
*/
#if defined(CONFIG_VMAP_STACK) && (MIN_THREAD_SHIFT < PAGE_SHIFT)
#if (MIN_THREAD_SHIFT < PAGE_SHIFT)
#define THREAD_SHIFT PAGE_SHIFT
#else
#define THREAD_SHIFT MIN_THREAD_SHIFT
@@ -135,11 +135,7 @@
* checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry
* assembly.
*/
#ifdef CONFIG_VMAP_STACK
#define THREAD_ALIGN (2 * THREAD_SIZE)
#else
#define THREAD_ALIGN THREAD_SIZE
#endif
#define IRQ_STACK_SIZE THREAD_SIZE