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-rw-r--r--arch/arm64/kernel/entry.S3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 583f71abbe98..7c6a0a41676f 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -76,7 +76,8 @@ alternative_else_nop_endif
#ifdef CONFIG_VMAP_STACK
/*
* Test whether the SP has overflowed, without corrupting a GPR.
- * Task and IRQ stacks are aligned to (1 << THREAD_SHIFT).
+ * Task and IRQ stacks are aligned so that SP & (1 << THREAD_SHIFT)
+ * should always be zero.
*/
add sp, sp, x0 // sp' = sp + x0
sub x0, sp, x0 // x0' = sp' - x0 = (sp + x0) - x0 = sp