linux-kernel - Re: [patch 1/7] libata: check for AN support

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Date:	Tue, 24 Apr 2007 12:23:04 +0200
From:	Olivier Galibert <galibert@...ox.com>
To:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, jeff@...zik.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org, htejun@...il.com
Subject: Re: [patch 1/7] libata: check for AN support

Sorry for replying to Alan's reply, I missed the original mail.

> > +#define ata_id_has_AN(id)	\
> > +	((id[76] && (~id[76])) & ((id)[78] & (1 << 5)))

(a && ~a) & (b & 32)

I don't think that does what you think it does, because at that point
it's a funny way to write 0 ((0 or 1) binary-and (0 or 32)).

I'm not even sure what it is you want.  If for the first part you
wanted (id[76] != 0x00 && id[76] != 0xff), please write just that,
thanks :-)

  OG.
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