linux-kernel - Re: linux-next: [PATCH] infiniband/hw/ipath/ipath

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Date:	Thu, 22 May 2008 04:39:16 +0200
From:	"Gabriel C" <nix.or.die@...glemail.com>
To:	"Tony Breeds" <tony@...eyournoodle.com>
Cc:	rolandd@...co.com,
	"Linux Kernel list" <linux-kernel@...r.kernel.org>,
	general@...ts.openfabrics.org, sean.hefty@...el.com,
	hal.rosenstock@...il.com, linux-next@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: linux-next: [PATCH] infiniband/hw/ipath/ipath_sdma.c , fix compiler warnings

2008/5/22 Tony Breeds <tony@...eyournoodle.com>:
>
> On Wed, May 21, 2008 at 04:06:36PM +0200, Gabriel C wrote:
> > On linux-next from today , allmodconfig, I see the following warnings on 64bit:
>
> x86_64 right?
>
> <snip>
>
> > diff --git a/drivers/infiniband/hw/ipath/ipath_sdma.c b/drivers/infiniband/hw/ipath/ipath_sdma.c
> > index 3697449..5f80151 100644
> > --- a/drivers/infiniband/hw/ipath/ipath_sdma.c
> > +++ b/drivers/infiniband/hw/ipath/ipath_sdma.c
> > @@ -257,7 +257,7 @@ static void sdma_abort_task(unsigned long opaque)
> >       /* everything is stopped, time to clean up and restart */
> >       if (status == IPATH_SDMA_ABORT_ABORTED) {
> >               struct ipath_sdma_txreq *txp, *txpnext;
> > -             u64 hwstatus;
> > +             unsigned long hwstatus;
> >               int notify = 0;
> >
> >               hwstatus = ipath_read_kreg64(dd,
>
> This can't be right.  hwstatus needs to be u64, as that's what ipath_read_kreg64() retuns.
> and a little bit further down we see:
>
> ---
> if (/* ScoreBoardDrainInProg */
>    test_bit(63, &hwstatus) ||
>    /* AbortInProg */
>    test_bit(62, &hwstatus) ||
>    /* InternalSDmaEnable */
>    test_bit(61, &hwstatus) ||
> ---
>
> so hwstatus, clearly needs to be 64-bits.

Hmm , right it need be 64-bits.

I should drink my coffee first and read code more carefully
before sending out wrong patches , sorry.

> This brings up an interesting point.  test_bit() and co are
> essntally expecting to be passed the address
> of an unsigned long[], so is it correct to pass &u64?

I'm not sure about this one.

>
> Yours Tony
>

Gabriel
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