From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 6/8] ARM: soft_restart: disable the outer L2 when the last CPU is going down
Date: Tue, 8 Nov 2011 15:53:01 +0000 [thread overview]
Message-ID: <1320767583-21162-7-git-send-email-will.deacon@arm.com> (raw)
In-Reply-To: <1320767583-21162-1-git-send-email-will.deacon@arm.com>
Soft-restarting a system with an outer, shared L2 requires us to disable
it when no other CPUs are running.
This patch adds an outer_disable call to soft_restart so that the last
CPU going down will disable the L2 cache.
Signed-off-by: Will Deacon <will.deacon@arm.com>
---
arch/arm/kernel/process.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 577d092..664d351 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -137,6 +137,10 @@ void soft_restart(unsigned long addr)
local_irq_disable();
local_fiq_disable();
+ /* Disable the L2 if we're the last man standing. */
+ if (num_online_cpus() == 1)
+ outer_disable();
+
/* Change to the new stack and continue with the reset. */
call_with_stack(__soft_restart, (void *)addr, (void *)stack);
--
1.7.4.1
next prev parent reply other threads:[~2011-11-08 15:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-08 15:52 [PATCH v5 0/8] kexec fixes and soft restart code Will Deacon
2011-11-08 15:52 ` [PATCH v5 1/8] Revert "ARM: 7098/1: kdump: copy kernel relocation code at the kexec prepare stage" Will Deacon
2011-11-08 15:52 ` [PATCH v5 2/8] ARM: lib: add call_with_stack function for safely changing stack Will Deacon
2011-11-08 15:52 ` [PATCH v5 3/8] ARM: idmap: populate identity map pgd at init time Will Deacon
2011-11-12 11:14 ` Russell King - ARM Linux
2011-11-13 12:20 ` Will Deacon
2011-11-08 15:52 ` [PATCH v5 4/8] ARM: reset: allow kernelspace mappings to be flat mapped during reset Will Deacon
2011-11-08 15:53 ` [PATCH v5 5/8] ARM: reset: implement soft_restart for jumping to a physical address Will Deacon
2011-11-08 15:53 ` Will Deacon [this message]
2011-11-08 15:53 ` [PATCH v5 7/8] ARM: stop: execute platform callback from cpu_stop code Will Deacon
2011-11-08 15:53 ` [PATCH v5 8/8] ARM: kexec: use soft_restart for branching to the reboot buffer Will Deacon
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