netdev - Re: [PATCH net-next 6/9] s390/qeth: fix various format strings

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Date:   Mon, 25 Oct 2021 17:32:18 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Julian Wiedmann <jwi@...ux.ibm.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-netdev <netdev@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Karsten Graul <kgraul@...ux.ibm.com>
Subject: Re: [PATCH net-next 6/9] s390/qeth: fix various format strings

On Mon, Oct 25, 2021 at 03:35:25PM +0200, Julian Wiedmann wrote:
> On 25.10.21 15:22, Vladimir Oltean wrote:
> > On Mon, Oct 25, 2021 at 11:56:55AM +0200, Julian Wiedmann wrote:
> >> From: Heiko Carstens <hca@...ux.ibm.com>
> >>
> >> Various format strings don't match with types of parameters.
> >> Fix all of them.
> >>
> >> Acked-by: Julian Wiedmann <jwi@...ux.ibm.com>
> >> Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
> >> Signed-off-by: Julian Wiedmann <jwi@...ux.ibm.com>
> >> ---
> >>  drivers/s390/net/qeth_l2_main.c | 14 +++++++-------
> >>  1 file changed, 7 insertions(+), 7 deletions(-)
> >>
> >> diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
> >> index adba52da9cab..0347fc184786 100644
> >> --- a/drivers/s390/net/qeth_l2_main.c
> >> +++ b/drivers/s390/net/qeth_l2_main.c
> >> @@ -661,13 +661,13 @@ static void qeth_l2_dev2br_fdb_notify(struct qeth_card *card, u8 code,
> >>  					 card->dev, &info.info, NULL);
> >>  		QETH_CARD_TEXT(card, 4, "andelmac");
> >>  		QETH_CARD_TEXT_(card, 4,
> >> -				"mc%012lx", ether_addr_to_u64(ntfy_mac));
> >> +				"mc%012llx", ether_addr_to_u64(ntfy_mac));
> >>  	} else {
> >>  		call_switchdev_notifiers(SWITCHDEV_FDB_ADD_TO_BRIDGE,
> >>  					 card->dev, &info.info, NULL);
> >>  		QETH_CARD_TEXT(card, 4, "anaddmac");
> >>  		QETH_CARD_TEXT_(card, 4,
> >> -				"mc%012lx", ether_addr_to_u64(ntfy_mac));
> >> +				"mc%012llx", ether_addr_to_u64(ntfy_mac));
> > 
> > You can print MAC addresses using the "%pM" printf format specifier, and
> > the ntfy_mac as argument.
> > 
> 
> Unfortunately not - no pointers allowed in such s390 dbf trace entries. See
> e19e5be8b4ca ("s390/qeth: sanitize strings in debug messages").

Is this because __debug_sprintf_event() saves just the printf-formatted
string and evaluates it only when the trace buffer is shown? Sorry for
my ignorance.