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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , netfilter-devel@vger.kernel.org, coreteam@netfilter.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Masami Hiramatsu , Rasmus Villemoes , Andy Shevchenko , Steven Rostedt , Sergey Senozhatsky , Andrew Morton Subject: Re: [PATCH next] netfilter: nf_conntrack_h323: Correct indentation when H323_TRACE defined Message-ID: References: <20260326201819.3900-1-david.laight.linux@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260326201819.3900-1-david.laight.linux@gmail.com> On Thu 2026-03-26 20:18:19, david.laight.linux@gmail.com wrote: > From: David Laight > > The trace lines are indented using PRINT("%*.s", xx, " "). > Userspace will treat this as "%*.0s" and will output no characters > when 'xx' is zero, the kernel treats it as "%*s" and will output > a single ' ' - which is probably what is intended. > > Change all the formats to "%*s" removing the default precision. > This gives a single space indent when level is zero. > > Signed-off-by: David Laight > --- > net/netfilter/nf_conntrack_h323_asn1.c | 38 +++++++++++++------------- > 1 file changed, 19 insertions(+), 19 deletions(-) > > diff --git a/net/netfilter/nf_conntrack_h323_asn1.c b/net/netfilter/nf_conntrack_h323_asn1.c > index 7b1497ed97d2..287402428975 100644 > --- a/net/netfilter/nf_conntrack_h323_asn1.c > +++ b/net/netfilter/nf_conntrack_h323_asn1.c > @@ -276,7 +276,7 @@ static unsigned int get_uint(struct bitstr *bs, int b) > static int decode_nul(struct bitstr *bs, const struct field_t *f, > char *base, int level) > { > - PRINT("%*.s%s\n", level * TAB_SIZE, " ", f->name); > + PRINT("%*s%s\n", level * TAB_SIZE, " ", f->name); > > return H323_ERROR_NONE; > } The change is important for making the kernel %*.s handling POSIX compliant. The dot '.' without any following number is handled a zero precision by POSIX. It would print no space "" when also the field width was zero, aka when level == 0. It has no efect if the field width (@level) is always > 0 because vsprintf() would add the required emptry spaces ' ' anyway. Reviewed-by: Petr Mladek Best Regards, Petr