linux-kernel - Re: idio{,ma}tic typos (was Re: + fix-vm_can_nonlinear-check-in-sys_remap_file

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Message-ID: <20071011073537.GA6697@localhost.sw.ru>
Date:	Thu, 11 Oct 2007 11:35:37 +0400
From:	Alexey Dobriyan <adobriyan@...ru>
To:	Josh Triplett <josh@...edesktop.org>
Cc:	Al Viro <viro@....linux.org.uk>, linux-kernel@...r.kernel.org,
	davej@...emonkey.org.uk, Pierre Ossman <drzeus@...eus.cx>,
	akpm@...l.org, linux-sparse@...r.kernel.org
Subject: Re: idio{,ma}tic typos (was Re: + fix-vm_can_nonlinear-check-in-sys_remap_file_pages.patch added to -mm tree)

On Wed, Oct 10, 2007 at 04:45:46AM -0700, Josh Triplett wrote:
> Alexey Dobriyan wrote:
> > ["if (!x & y)" patch from yanzheng@]
> > ["if (!x & y)" patch from adobriyan@]
> > ["if (!x & y)" patches from viro@]
> > 
> > While we're at it, below is somewhat ugly sparse patch for detecting
> > "&& 0x" typos.
> 
> Excellent idea!  I think it applies to || as well.

Sadly, yes.

[PATCH] smctr: fix "|| 0x" typo

IBM_PASS_SOURCE_ADDR is 1, so logically ORing it with status bits is
pretty useless. Do bitwise OR, instead.

Signed-off-by: Alexey Dobriyan <adobriyan@...ru>
---

 drivers/net/tokenring/smctr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/tokenring/smctr.c
+++ b/drivers/net/tokenring/smctr.c
@@ -3413,7 +3413,7 @@ static int smctr_make_tx_status_code(struct net_device *dev,
         tsv->svi = TRANSMIT_STATUS_CODE;
         tsv->svl = S_TRANSMIT_STATUS_CODE;
 
-        tsv->svv[0] = ((tx_fstatus & 0x0100 >> 6) || IBM_PASS_SOURCE_ADDR);
+        tsv->svv[0] = ((tx_fstatus & 0x0100 >> 6) | IBM_PASS_SOURCE_ADDR);
 
         /* Stripped frame status of Transmitted Frame */
         tsv->svv[1] = tx_fstatus & 0xff;

> I'll most likely
> add a -Wboolean-logic-on-bit-constant to turn this warning on.

Ewww, more options. :-(

> Any reason why this wouldn't apply to octal constants or to GCC's new
> binary constants?  I can trivially modify this patch to handle those
> as well, just by dropping the check for an 'x' or 'X', and renaming the
> flag.

OK, let me try too.

-
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