From: Jungseok Lee <jungseoklee85@gmail.com>
To: catalin.marinas@arm.com, will.deacon@arm.com,
linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Subject: [RFC PATCH 1/3] arm64: entry: Remove unnecessary calculation for S_SP in EL1h
Date: Fri, 4 Sep 2015 14:23:05 +0000 [thread overview]
Message-ID: <1441376587-12979-2-git-send-email-jungseoklee85@gmail.com> (raw)
In-Reply-To: <1441376587-12979-1-git-send-email-jungseoklee85@gmail.com>
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@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
next prev parent reply other threads:[~2015-09-04 14:24 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-04 14:23 [RFC PATCH 0/3] Implement IRQ stack on ARM64 Jungseok Lee
2015-09-04 14:23 ` Jungseok Lee [this message]
2015-09-07 14:48 ` [RFC PATCH 1/3] arm64: entry: Remove unnecessary calculation for S_SP in EL1h James Morse
2015-09-07 14:56 ` Mark Rutland
2015-09-07 15:51 ` Jungseok Lee
2015-09-04 14:23 ` [RFC PATCH 2/3] arm64: Introduce IRQ stack Jungseok Lee
2015-09-04 17:12 ` Alexnader Kuleshov
2015-09-07 14:08 ` Jungseok Lee
2015-09-07 14:48 ` James Morse
2015-09-08 14:28 ` Jungseok Lee
2015-09-04 14:23 ` [RFC PATCH 3/3] arm64: Reduce kernel stack size when using " Jungseok Lee
2015-09-07 14:33 ` [RFC PATCH 0/3] Implement IRQ stack on ARM64 James Morse
2015-09-07 14:36 ` [PATCH] arm64: kernel: Use a separate stack for irq interrupts James Morse
2015-09-07 15:48 ` Jungseok Lee
2015-09-07 16:06 ` James Morse
2015-09-07 16:34 ` Jungseok Lee
2015-09-08 1:45 ` AKASHI Takahiro
2015-09-08 6:44 ` AKASHI Takahiro
2015-09-08 14:59 ` Jungseok Lee
2015-09-08 7:51 ` AKASHI Takahiro
2015-09-08 14:54 ` Jungseok Lee
2015-09-08 16:47 ` James Morse
2015-09-09 13:22 ` Jungseok Lee
2015-09-09 18:13 ` James Morse
2015-09-10 23:30 ` Jungseok Lee
2015-09-07 15:42 ` [RFC PATCH 0/3] Implement IRQ stack on ARM64 Jungseok Lee
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