Re: [PATCH]: fixing gcc 4.4 compiler warning: suggest parentheses around operand of ‘!’

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On Thu, 2009-04-30 at 09:04 +0300, Sergey Senozhatsky wrote:
> Trivial: fixing gcc 4.4 compiler warning:
> drivers/scsi/st.c: In function ‘st_int_ioctl’:
> drivers/scsi/st.c:2967: warning: suggest parentheses around operand of ‘!’ or change ‘|’ to ‘||’ or ‘!’ to ‘~’
> 
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxx>
> 
> ---
> 
> diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
> index eb24efe..2bde8a5 100644
> --- a/drivers/scsi/st.c
> +++ b/drivers/scsi/st.c
> @@ -2964,7 +2964,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
>  			    !(STp->use_pf & PF_TESTED)) {
>  				/* Try the other possible state of Page Format if not
>  				   already tried */
> -				STp->use_pf = !STp->use_pf | PF_TESTED;
> +				STp->use_pf = (!STp->use_pf) | PF_TESTED;

This just doesn't look right.  As I said to the warning reporter, I
think STp->use_pf |= PF_TESTED; is the correct fix, but I need Kai to
check this.

James


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