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Date: Thu, 3 Jan 2002 15:17:20 -0700
From: Cort Dougan <cort@fsmlabs.com>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Who uses hdx=bswap or hdx=swapdata?
Message-ID: <20020103151720.E20821@ftsoj.fsmlabs.com>
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In-Reply-To: <3C34D6FC.9090207@colorfullife.com>; from manfred@colorfullife.com on Thu, Jan 03, 2002 at 11:11:08PM +0100
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It used to be necessary on the IBM 830 CDROM but I think those have fallen
into disrepair and have undergone many changes.  The 830's likely need that
still but probably can't boot for other reasons now, though.

} Is the hdx=bswap or hdx=swapdata option actually in use?
} When is it needed?
} The current implementation can cause data corruptions on SMP with PIO 
} transfers:
} It modifies the source buffer during disk writes, and these temporary
} modifications (within the irq handler) are visible with mmap on SMP.
} 
} Is it possible to remove the option entirely, or should it be fixed?
} 
} --
}     Manfred
} 
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