From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
To: linux-kernel@vger.kernel.org,
Linux ARM Kernel list <linux-arm-kernel@lists.arm.linux.org.uk>
Subject: [2.6.7.11, BUG] spin_lock_irqsave() unsafe for use with FIQ and no spin_lock_localsave() exists
Date: Tue, 26 Apr 2005 17:24:48 +0100 [thread overview]
Message-ID: <20050426162448.GD8817@lkcl.net> (raw)
like the subject says.
i utilised spin_lock_irqsave() with a FIQ handler, expecting to be able
to do this:
spin_lock_irqsave(...)
local_fiq_disable()
spin_lock_restoreflags(...)
aaaannnd it caused some weirdo behaviour - not surprisingly because
spin_lock_irqsave() calls local_irq_save() which ONLY saves the
interrupt handler flags - NOT the FIQ handler flags.
a spin_lock_saveflags() which does exactly what spin_lock_irqsave() does
except it calls local_irq_save would be _greatly_ appreciated.
in linux/spinlock.h.
because i'm having to #define one anyway.
tia.
l.
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reply other threads:[~2005-04-26 16:19 UTC|newest]
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