From: Mark Rutland <mark.rutland@arm.com>
To: linux-arm-kernel@lists.infradead.org, will@kernel.org,
catalin.marinas@arm.com
Cc: james.morse@arm.com, mark.rutland@arm.com, maz@kernel.org
Subject: [PATCH 01/14] arm64: remove redundant local_daif_mask() in bad_mode()
Date: Mon, 10 May 2021 16:56:08 +0100 [thread overview]
Message-ID: <20210510155621.52811-2-mark.rutland@arm.com> (raw)
In-Reply-To: <20210510155621.52811-1-mark.rutland@arm.com>
Upon taking an exception, the CPU sets all the DAIF bits. We never
clear any of these bits prior to calling bad_mode(), and bad_mode()
itself never clears any of these bits, so there's no need to call
local_daif_mask().
This patch removes the redundant call.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Will Deacon <will@kernel.org>
---
arch/arm64/kernel/traps.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index a05d34f0e82a..41f0aa92022a 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -765,7 +765,6 @@ asmlinkage void notrace bad_mode(struct pt_regs *regs, int reason, unsigned int
esr_get_class_string(esr));
__show_regs(regs);
- local_daif_mask();
panic("bad mode");
}
--
2.11.0
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next prev parent reply other threads:[~2021-05-10 15:58 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-10 15:56 [PATCH 00/14] arm64: entry: migrate more code to C Mark Rutland
2021-05-10 15:56 ` Mark Rutland [this message]
2021-05-10 15:56 ` [PATCH 02/14] arm64: entry: unmask IRQ+FIQ after EL0 handling Mark Rutland
2021-05-10 15:56 ` [PATCH 03/14] arm64: entry: convert SError handlers to C Mark Rutland
2021-05-10 15:56 ` [PATCH 04/14] arm64: entry: move arm64_preempt_schedule_irq to entry-common.c Mark Rutland
2021-05-10 15:56 ` [PATCH 05/14] arm64: entry: move preempt logic to C Mark Rutland
2021-05-10 15:56 ` [PATCH 06/14] arm64: entry: add a call_on_irq_stack helper Mark Rutland
2021-05-10 15:56 ` [PATCH 07/14] arm64: entry: convert IRQ+FIQ handlers to C Mark Rutland
2021-05-10 15:56 ` [PATCH 08/14] arm64: entry: organise entry handlers consistently Mark Rutland
2021-05-10 15:56 ` [PATCH 09/14] arm64: entry: organise entry vectors consistently Mark Rutland
2021-05-10 15:56 ` [PATCH 10/14] arm64: entry: consolidate EL1 exception returns Mark Rutland
2021-05-10 15:56 ` [PATCH 11/14] arm64: entry: move bad_mode() to entry-common.c Mark Rutland
2021-05-10 15:56 ` [PATCH 12/14] arm64: entry: improve bad_mode() Mark Rutland
2021-05-10 15:56 ` [PATCH 13/14] arm64: entry: template the entry asm functions Mark Rutland
2021-05-10 15:56 ` [PATCH 14/14] arm64: entry: handle all vectors with C Mark Rutland
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