[RFC PATCH 1/3] arm64: entry: Remove unnecessary calculation for S_SP in EL1h

[Jungseok Lee]

Under EL1h, S_SP data is not seen in kernel_exit. Thus, x21 calculation
is not needed in kernel_entry. Currently, S_SP information is vaild only
when sp_el0 is used.

Signed-off-by: Jungseok Lee <jungseoklee85 at gmail.com>
---
 arch/arm64/kernel/entry.S | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index e163518..d23ca0d 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -91,8 +91,6 @@
 	get_thread_info tsk			// Ensure MDSCR_EL1.SS is clear,
 	ldr	x19, [tsk, #TI_FLAGS]		// since we can unmask debug
 	disable_step_tsk x19, x20		// exceptions when scheduling.
-	.else
-	add	x21, sp, #S_FRAME_SIZE
 	.endif
 	mrs	x22, elr_el1
 	mrs	x23, spsr_el1
-- 
1.9.1