From: rabin@rab.in (Rabin Vincent)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC] ARM: Make CPU_DCACHE_DISABLE depend on !SMP
Date: Fri, 9 Jan 2015 18:57:38 +0100 [thread overview]
Message-ID: <20150109175738.GA4057@debian> (raw)
In-Reply-To: <1420683088-1856-1-git-send-email-f.fainelli@gmail.com>
On Wed, Jan 07, 2015 at 06:11:28PM -0800, Florian Fainelli wrote:
> Enabling CPU_DCACHE_DISABLE on a SMP capable system will prevent the
> kernel from booting because of the following ldrex instruction in
> arch_spin_lock:
BTW, it's not just SMP spin_lock which uses ldrex/strex. The atomic
ops, set_bit() and friends, and cmpxchg() and related functions all use
ldrex/strex on ARMv6+ processors, even if you disable SMP.
prev parent reply other threads:[~2015-01-09 17:57 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-08 2:11 [RFC] ARM: Make CPU_DCACHE_DISABLE depend on !SMP Florian Fainelli
2015-01-08 8:33 ` Arnd Bergmann
2015-01-08 11:52 ` Russell King - ARM Linux
2015-01-08 15:53 ` Florian Fainelli
2015-01-08 21:54 ` Gregory Fong
2015-01-08 22:10 ` Arnd Bergmann
2015-01-08 22:13 ` Russell King - ARM Linux
2015-01-08 22:25 ` Florian Fainelli
2015-01-09 16:16 ` Russell King - ARM Linux
2015-01-09 18:35 ` Florian Fainelli
2015-01-08 22:11 ` Gregory Fong
2015-01-09 17:57 ` Rabin Vincent [this message]
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