[PATCH 00/16] ARM: mostly harmless gcc warnings

[PATCH 00/16] ARM: mostly harmless gcc warnings

[Arnd Bergmann]

In my attempt to weed out all warnings in ARM defconfigs, this
is the latest installment of patches. Ideally these could all
go through the respective subsystem maintainer trees, but
for any patches I don't hear anything back on, I will just
merge them through the arm-soc tree.

	Arnd

Arnd Bergmann (16):
  ARM: warnings in arch/arm/include/asm/uaccess.h
  ARM: binfmt_flat: unused variable 'persistent'
  SCSI: ARM: ncr5380/oak uses no interrupts
  SCSI: ARM: make fas216_dumpinfo function conditional
  vfs: bogus warnings in fs/namei.c
  mm/slob: use min_t() to compare ARCH_SLAB_MINALIGN
  cgroup: fix warning when building without any subsys
  ipvs: fix ip_vs_set_timeout debug messages
  USB: EHCI: mark ehci_orion_conf_mbus_windows __devinit
  clk: don't mark clkdev_add_table as init
  pcmcia: sharpsl: don't discard sharpsl_pcmcia_ops
  video: mark nuc900fb_map_video_memory as __devinit
  ARM: be really quiet when building with 'make -s'
  ARM: pxa: armcore: fix PCI PIO warnings
  spi/s3c64xx: use correct dma_transfer_direction type
  ARM: pass -marm to gcc by default for both C and assembler

 arch/arm/Makefile               |   13 +++++++------
 arch/arm/boot/Makefile          |   10 +++++-----
 arch/arm/common/it8152.c        |   12 +++++++++---
 arch/arm/include/asm/flat.h     |    2 +-
 arch/arm/include/asm/uaccess.h  |    4 ++--
 arch/arm/tools/Makefile         |    2 +-
 drivers/clk/clkdev.c            |    2 +-
 drivers/pcmcia/pxa2xx_sharpsl.c |    2 +-
 drivers/scsi/arm/fas216.c       |    2 +-
 drivers/scsi/arm/oak.c          |    1 +
 drivers/spi/spi-s3c64xx.c       |    2 +-
 drivers/usb/host/ehci-orion.c   |    2 +-
 drivers/video/nuc900fb.c        |    2 +-
 fs/namei.c                      |    6 +++---
 include/linux/cgroup.h          |    2 +-
 mm/slob.c                       |    6 +++---
 net/netfilter/ipvs/ip_vs_ctl.c  |   10 ++++++----
 17 files changed, 45 insertions(+), 35 deletions(-)

Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Ben Blum <bblum@andrew.cmu.edu>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Bryan Wu <bryan.wu@canonical.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dave Martin <dave.martin@linaro.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Eric Miao <eric.y.miao@gmail.com>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Greg Ungerer <gerg@uclinux.org>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Jan Kara <jack@suse.cz>
Cc: Jochen Friedrich <jochen@scram.de>
Cc: Julian Anastasov <ja@ssi.bg>
Cc: Krzysztof Halasa <khc@pm.waw.pl>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Mike Rapoport <mike@compulab.co.il>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Pavel Machek <pavel@suse.cz>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Simon Horman <horms@verge.net.au>
Cc: Tejun Heo <tj@kernel.org>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Cc: coreteam@netfilter.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-fbdev@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-pcmcia@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-scsi@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: netfilter-devel@vger.kernel.org
Cc: netfilter@vger.kernel.org
Cc: spi-devel-general@lists.sourceforge.net


-- 
1.7.10

[PATCH 08/16] ipvs: fix ip_vs_set_timeout debug messages

[Arnd Bergmann]

The ip_vs_set_timeout function sets timeouts for TCP and UDP, which
can be enabled independently at compile time. The debug message
always prints both timeouts that are passed into the function,
but if one is disabled, the message will show uninitialized data.

This splits the debug message into two separte IP_VS_DBG statements
that are in the same #ifdef section to ensure we only print the
text about what is actually going on.

Without this patch, building ARM ixp4xx_defconfig results in:

net/netfilter/ipvs/ip_vs_ctl.c: In function 'ip_vs_genl_set_cmd':
net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.udp_timeout' may be used uninitialized in this function [-Wuninitialized]
net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.udp_timeout' was declared here
net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_fin_timeout' may be used uninitialized in this function [-Wuninitialized]
net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_fin_timeout' was declared here
net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_timeout' may be used uninitialized in this function [-Wuninitialized]
net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_timeout' was declared here

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Cc: Simon Horman <horms@verge.net.au>
Cc: Julian Anastasov <ja@ssi.bg>
Cc: netfilter-devel@vger.kernel.org
Cc: netfilter@vger.kernel.org
Cc: coreteam@netfilter.org
---
 net/netfilter/ipvs/ip_vs_ctl.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index f51013c..f3a66c3 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -2237,12 +2237,11 @@ static int ip_vs_set_timeout(struct net *net, struct ip_vs_timeout_user *u)
 	struct ip_vs_proto_data *pd;
 #endif
 
-	IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
+#ifdef CONFIG_IP_VS_PROTO_TCP
+	IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d\n",
 		  u->tcp_timeout,
-		  u->tcp_fin_timeout,
-		  u->udp_timeout);
+		  u->tcp_fin_timeout);
 
-#ifdef CONFIG_IP_VS_PROTO_TCP
 	if (u->tcp_timeout) {
 		pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
 		pd->timeout_table[IP_VS_TCP_S_ESTABLISHED]
@@ -2257,6 +2256,9 @@ static int ip_vs_set_timeout(struct net *net, struct ip_vs_timeout_user *u)
 #endif
 
 #ifdef CONFIG_IP_VS_PROTO_UDP
+	IP_VS_DBG(2, "Setting timeout udp:%d\n",
+		  u->udp_timeout);
+
 	if (u->udp_timeout) {
 		pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
 		pd->timeout_table[IP_VS_UDP_S_NORMAL]
-- 
1.7.10

Re: [PATCH 08/16] ipvs: fix ip_vs_set_timeout debug messages

[Julian Anastasov]

	Hello,

On Fri, 5 Oct 2012, Arnd Bergmann wrote:

> The ip_vs_set_timeout function sets timeouts for TCP and UDP, which
> can be enabled independently at compile time. The debug message
> always prints both timeouts that are passed into the function,
> but if one is disabled, the message will show uninitialized data.
> 
> This splits the debug message into two separte IP_VS_DBG statements
> that are in the same #ifdef section to ensure we only print the
> text about what is actually going on.
> 
> Without this patch, building ARM ixp4xx_defconfig results in:

	Are there any CONFIG_IP_VS_PROTO_xxx options in this
default config? It is a waste of memory if IPVS is compiled
without any protocols.

> net/netfilter/ipvs/ip_vs_ctl.c: In function 'ip_vs_genl_set_cmd':
> net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.udp_timeout' may be used uninitialized in this function [-Wuninitialized]
> net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.udp_timeout' was declared here
> net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_fin_timeout' may be used uninitialized in this function [-Wuninitialized]
> net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_fin_timeout' was declared here
> net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_timeout' may be used uninitialized in this function [-Wuninitialized]
> net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_timeout' was declared here

	There are many __ip_vs_get_timeouts callers but
just one calls memset(&t, 0, sizeof(t)) before that,
problem only for ip_vs_genl_set_config and ip_vs_set_timeout.

	To be safe, can we move this memset into
__ip_vs_get_timeouts instead of playing games with defines?:

	memset(t, 0, sizeof(*t));

	This debug message will be more precise in showing the
changed values if we replace the __ip_vs_get_timeouts 
call in ip_vs_genl_set_config with memset(&t, 0, sizeof(t)).
Then we will see 0 for values that are not changed/supported.

> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: netdev@vger.kernel.org
> Cc: Simon Horman <horms@verge.net.au>
> Cc: Julian Anastasov <ja@ssi.bg>
> Cc: netfilter-devel@vger.kernel.org
> Cc: netfilter@vger.kernel.org
> Cc: coreteam@netfilter.org
> ---
>  net/netfilter/ipvs/ip_vs_ctl.c |   10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
> index f51013c..f3a66c3 100644
> --- a/net/netfilter/ipvs/ip_vs_ctl.c
> +++ b/net/netfilter/ipvs/ip_vs_ctl.c
> @@ -2237,12 +2237,11 @@ static int ip_vs_set_timeout(struct net *net, struct ip_vs_timeout_user *u)
>  	struct ip_vs_proto_data *pd;
>  #endif
>  
> -	IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
> +#ifdef CONFIG_IP_VS_PROTO_TCP
> +	IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d\n",
>  		  u->tcp_timeout,
> -		  u->tcp_fin_timeout,
> -		  u->udp_timeout);
> +		  u->tcp_fin_timeout);
>  
> -#ifdef CONFIG_IP_VS_PROTO_TCP
>  	if (u->tcp_timeout) {
>  		pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
>  		pd->timeout_table[IP_VS_TCP_S_ESTABLISHED]
> @@ -2257,6 +2256,9 @@ static int ip_vs_set_timeout(struct net *net, struct ip_vs_timeout_user *u)
>  #endif
>  
>  #ifdef CONFIG_IP_VS_PROTO_UDP
> +	IP_VS_DBG(2, "Setting timeout udp:%d\n",
> +		  u->udp_timeout);
> +
>  	if (u->udp_timeout) {
>  		pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
>  		pd->timeout_table[IP_VS_UDP_S_NORMAL]
> -- 
> 1.7.10

Regards

--
Julian Anastasov <ja@ssi.bg>

Re: [PATCH 08/16] ipvs: fix ip_vs_set_timeout debug messages

[Arnd Bergmann]

On Friday 05 October 2012, Julian Anastasov wrote:
> 
> 	Hello,
> 
> On Fri, 5 Oct 2012, Arnd Bergmann wrote:
> 
> > The ip_vs_set_timeout function sets timeouts for TCP and UDP, which
> > can be enabled independently at compile time. The debug message
> > always prints both timeouts that are passed into the function,
> > but if one is disabled, the message will show uninitialized data.
> > 
> > This splits the debug message into two separte IP_VS_DBG statements
> > that are in the same #ifdef section to ensure we only print the
> > text about what is actually going on.
> > 
> > Without this patch, building ARM ixp4xx_defconfig results in:
> 
> 	Are there any CONFIG_IP_VS_PROTO_xxx options in this
> default config? It is a waste of memory if IPVS is compiled
> without any protocols.

They all appear to be turned off:

$ grep CONFIG_IP_VS obj-tmp/.config
CONFIG_IP_VS=m
CONFIG_IP_VS_DEBUG=y
CONFIG_IP_VS_TAB_BITS=12
# CONFIG_IP_VS_PROTO_TCP is not set
# CONFIG_IP_VS_PROTO_UDP is not set
# CONFIG_IP_VS_PROTO_AH_ESP is not set
# CONFIG_IP_VS_PROTO_ESP is not set
# CONFIG_IP_VS_PROTO_AH is not set
# CONFIG_IP_VS_PROTO_SCTP is not set
CONFIG_IP_VS_RR=m
CONFIG_IP_VS_WRR=m
CONFIG_IP_VS_LC=m
CONFIG_IP_VS_WLC=m
CONFIG_IP_VS_LBLC=m
CONFIG_IP_VS_LBLCR=m
CONFIG_IP_VS_DH=m
CONFIG_IP_VS_SH=m
# CONFIG_IP_VS_SED is not set
# CONFIG_IP_VS_NQ is not set
CONFIG_IP_VS_SH_TAB_BITS=8

> > net/netfilter/ipvs/ip_vs_ctl.c: In function 'ip_vs_genl_set_cmd':
> > net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.udp_timeout' may be used uninitialized in this function [-Wuninitialized]
> > net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.udp_timeout' was declared here
> > net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_fin_timeout' may be used uninitialized in this function [-Wuninitialized]
> > net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_fin_timeout' was declared here
> > net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_timeout' may be used uninitialized in this function [-Wuninitialized]
> > net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_timeout' was declared here
> 
> 	There are many __ip_vs_get_timeouts callers but
> just one calls memset(&t, 0, sizeof(t)) before that,
> problem only for ip_vs_genl_set_config and ip_vs_set_timeout.
> 
> 	To be safe, can we move this memset into
> __ip_vs_get_timeouts instead of playing games with defines?:
> 
> 	memset(t, 0, sizeof(*t));
> 
> 	This debug message will be more precise in showing the
> changed values if we replace the __ip_vs_get_timeouts 
> call in ip_vs_genl_set_config with memset(&t, 0, sizeof(t)).
> Then we will see 0 for values that are not changed/supported.

8<-----
ipvs: initialize returned data in do_ip_vs_get_ctl

As reported by a gcc warning, the do_ip_vs_get_ctl does not initalize
all the members of the ip_vs_timeout_user structure it returns if
at least one of the TCP or UDP protocols is disabled for ipvs. 

This makes sure that the data is always initialized, before it is
returned as a response to IPVS_CMD_GET_CONFIG or printed as a
debug message in IPVS_CMD_SET_CONFIG.

Without this patch, building ARM ixp4xx_defconfig results in:

net/netfilter/ipvs/ip_vs_ctl.c: In function 'ip_vs_genl_set_cmd':
net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.udp_timeout' may be used uninitialized in this function [-Wuninitialized]
net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.udp_timeout' was declared here
net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_fin_timeout' may be used uninitialized in this function [-Wuninitialized]
net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_fin_timeout' was declared here
net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_timeout' may be used uninitialized in this function [-Wuninitialized]
net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_timeout' was declared here

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 2770f85..3995d2e 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -2590,6 +2588,7 @@ __ip_vs_get_timeouts(struct net *net, struct ip_vs_timeout_user *u)
 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
 	struct ip_vs_proto_data *pd;
 #endif
+	memset(u, 0, sizeof (*u));
 
 #ifdef CONFIG_IP_VS_PROTO_TCP
 	pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
@@ -2768,7 +2767,6 @@ do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
 	{
 		struct ip_vs_timeout_user t;
 
-		memset(&t, 0, sizeof(t));
 		__ip_vs_get_timeouts(net, &t);
 		if (copy_to_user(user, &t, sizeof(t)) != 0)
 			ret = -EFAULT;

Re: [PATCH 08/16] ipvs: fix ip_vs_set_timeout debug messages

[Julian Anastasov]

	Hello,

On Sat, 6 Oct 2012, Arnd Bergmann wrote:

> On Friday 05 October 2012, Julian Anastasov wrote:
> > 
> > 	Hello,
> > 
> > On Fri, 5 Oct 2012, Arnd Bergmann wrote:
> > 
> > > The ip_vs_set_timeout function sets timeouts for TCP and UDP, which
> > > can be enabled independently at compile time. The debug message
> > > always prints both timeouts that are passed into the function,
> > > but if one is disabled, the message will show uninitialized data.
> > > 
> > > This splits the debug message into two separte IP_VS_DBG statements
> > > that are in the same #ifdef section to ensure we only print the
> > > text about what is actually going on.
> > > 
> > > Without this patch, building ARM ixp4xx_defconfig results in:
> > 
> > 	Are there any CONFIG_IP_VS_PROTO_xxx options in this
> > default config? It is a waste of memory if IPVS is compiled
> > without any protocols.
> 
> They all appear to be turned off:
> 
> $ grep CONFIG_IP_VS obj-tmp/.config
> CONFIG_IP_VS=m
> CONFIG_IP_VS_DEBUG=y
> CONFIG_IP_VS_TAB_BITS=12
> # CONFIG_IP_VS_PROTO_TCP is not set
> # CONFIG_IP_VS_PROTO_UDP is not set
> # CONFIG_IP_VS_PROTO_AH_ESP is not set
> # CONFIG_IP_VS_PROTO_ESP is not set
> # CONFIG_IP_VS_PROTO_AH is not set
> # CONFIG_IP_VS_PROTO_SCTP is not set
> CONFIG_IP_VS_RR=m
> CONFIG_IP_VS_WRR=m
> CONFIG_IP_VS_LC=m
> CONFIG_IP_VS_WLC=m
> CONFIG_IP_VS_LBLC=m
> CONFIG_IP_VS_LBLCR=m
> CONFIG_IP_VS_DH=m
> CONFIG_IP_VS_SH=m
> # CONFIG_IP_VS_SED is not set
> # CONFIG_IP_VS_NQ is not set
> CONFIG_IP_VS_SH_TAB_BITS=8

	Something should be changed here, may be at least
TCP/UDP, who knows.

> > > net/netfilter/ipvs/ip_vs_ctl.c: In function 'ip_vs_genl_set_cmd':
> > > net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.udp_timeout' may be used uninitialized in this function [-Wuninitialized]
> > > net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.udp_timeout' was declared here
> > > net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_fin_timeout' may be used uninitialized in this function [-Wuninitialized]
> > > net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_fin_timeout' was declared here
> > > net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_timeout' may be used uninitialized in this function [-Wuninitialized]
> > > net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_timeout' was declared here
> > 
> > 	There are many __ip_vs_get_timeouts callers but
> > just one calls memset(&t, 0, sizeof(t)) before that,
> > problem only for ip_vs_genl_set_config and ip_vs_set_timeout.
> > 
> > 	To be safe, can we move this memset into
> > __ip_vs_get_timeouts instead of playing games with defines?:
> > 
> > 	memset(t, 0, sizeof(*t));
> > 
> > 	This debug message will be more precise in showing the
> > changed values if we replace the __ip_vs_get_timeouts 
> > call in ip_vs_genl_set_config with memset(&t, 0, sizeof(t)).
> > Then we will see 0 for values that are not changed/supported.
> 
> 8<-----
> ipvs: initialize returned data in do_ip_vs_get_ctl
> 
> As reported by a gcc warning, the do_ip_vs_get_ctl does not initalize
> all the members of the ip_vs_timeout_user structure it returns if
> at least one of the TCP or UDP protocols is disabled for ipvs. 
> 
> This makes sure that the data is always initialized, before it is
> returned as a response to IPVS_CMD_GET_CONFIG or printed as a
> debug message in IPVS_CMD_SET_CONFIG.
> 
> Without this patch, building ARM ixp4xx_defconfig results in:
> 
> net/netfilter/ipvs/ip_vs_ctl.c: In function 'ip_vs_genl_set_cmd':
> net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.udp_timeout' may be used uninitialized in this function [-Wuninitialized]
> net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.udp_timeout' was declared here
> net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_fin_timeout' may be used uninitialized in this function [-Wuninitialized]
> net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_fin_timeout' was declared here
> net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_timeout' may be used uninitialized in this function [-Wuninitialized]
> net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_timeout' was declared here
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> 
> diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
> index 2770f85..3995d2e 100644
> --- a/net/netfilter/ipvs/ip_vs_ctl.c
> +++ b/net/netfilter/ipvs/ip_vs_ctl.c
> @@ -2590,6 +2588,7 @@ __ip_vs_get_timeouts(struct net *net, struct ip_vs_timeout_user *u)
>  #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
>  	struct ip_vs_proto_data *pd;
>  #endif

	That is what we want. If you plan another submission
you can add empty line before this memset and to replace
the __ip_vs_get_timeouts call in ip_vs_genl_set_config with
memset but they are cosmetic changes. Or may be Simon will
take care about the coding style when applying the change.

Acked-by: Julian Anastasov <ja@ssi.bg>

> +	memset(u, 0, sizeof (*u));
>  
>  #ifdef CONFIG_IP_VS_PROTO_TCP
>  	pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
> @@ -2768,7 +2767,6 @@ do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
>  	{
>  		struct ip_vs_timeout_user t;
>  
> -		memset(&t, 0, sizeof(t));
>  		__ip_vs_get_timeouts(net, &t);
>  		if (copy_to_user(user, &t, sizeof(t)) != 0)
>  			ret = -EFAULT;

Regards

--
Julian Anastasov <ja@ssi.bg>

Re: [PATCH 08/16] ipvs: fix ip_vs_set_timeout debug messages

[Arnd Bergmann]

On Saturday 06 October 2012, Julian Anastasov wrote:
> On Sat, 6 Oct 2012, Arnd Bergmann wrote:
> > > 	Are there any CONFIG_IP_VS_PROTO_xxx options in this
> > > default config? It is a waste of memory if IPVS is compiled
> > > without any protocols.
> > 
> > They all appear to be turned off:
> > 
> > $ grep CONFIG_IP_VS obj-tmp/.config
> > CONFIG_IP_VS=m
> > CONFIG_IP_VS_DEBUG=y
> > CONFIG_IP_VS_TAB_BITS=12
> > # CONFIG_IP_VS_PROTO_TCP is not set
> > # CONFIG_IP_VS_PROTO_UDP is not set
> > # CONFIG_IP_VS_PROTO_AH_ESP is not set
> > # CONFIG_IP_VS_PROTO_ESP is not set
> > # CONFIG_IP_VS_PROTO_AH is not set
> > # CONFIG_IP_VS_PROTO_SCTP is not set
> 
> 	Something should be changed here, may be at least
> TCP/UDP, who knows.

I don't try to read too much into our defconfigs. We have 140 of them
on ARM, and they are mainly useful to give a reasonable build coverage,
but I wouldn't expect them to be actually used on that hardware.

I'll leave it up to Krzysztof to send a patch for this if he wants.

> > --- a/net/netfilter/ipvs/ip_vs_ctl.c
> > +++ b/net/netfilter/ipvs/ip_vs_ctl.c
> > @@ -2590,6 +2588,7 @@ __ip_vs_get_timeouts(struct net *net, struct ip_vs_timeout_user *u)
> >  #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
> >  	struct ip_vs_proto_data *pd;
> >  #endif
> 
> 	That is what we want. If you plan another submission
> you can add empty line before this memset and to replace
> the __ip_vs_get_timeouts call in ip_vs_genl_set_config with
> memset but they are cosmetic changes. Or may be Simon will
> take care about the coding style when applying the change.
> 
> Acked-by: Julian Anastasov <ja@ssi.bg>

I'd prefer Simon to pick up the patch. He should also decide whether he wants
to add it to stable. In theory, this is a small leak of kernel stack data
to user space, but as you say in practice it should not happen because it
only exists for silly configurations that nobody should be using.

AFAICT, removing the call to __ip_vs_get_timeouts in do_ip_vs_get_ctl would
be a semantic change for the case where a user sends a IPVS_CMD_SET_CONFIG
message without without the complete set of attributes inside it. The current
behavior is to leave the timeouts alone, replacing the __ip_vs_get_timeouts
with a memset would zero them. I left this part alone then.

	Arnd

8<-----
ipvs: initialize returned data in do_ip_vs_get_ctl

As reported by a gcc warning, the do_ip_vs_get_ctl does not initalize
all the members of the ip_vs_timeout_user structure it returns if
at least one of the TCP or UDP protocols is disabled for ipvs. 

This makes sure that the data is always initialized, before it is
returned as a response to IPVS_CMD_GET_CONFIG or printed as a
debug message in IPVS_CMD_SET_CONFIG.

Without this patch, building ARM ixp4xx_defconfig results in:

net/netfilter/ipvs/ip_vs_ctl.c: In function 'ip_vs_genl_set_cmd':
net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.udp_timeout' may be used uninitialized in this function [-Wuninitialized]
net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.udp_timeout' was declared here
net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_fin_timeout' may be used uninitialized in this function [-Wuninitialized]
net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_fin_timeout' was declared here
net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_timeout' may be used uninitialized in this function [-Wuninitialized]
net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_timeout' was declared here

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Julian Anastasov <ja@ssi.bg>
---
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 2770f85..c4ee437 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -2591,6 +2589,8 @@ __ip_vs_get_timeouts(struct net *net, struct ip_vs_timeout_user *u)
 	struct ip_vs_proto_data *pd;
 #endif
 
+	memset(u, 0, sizeof (*u));
+
 #ifdef CONFIG_IP_VS_PROTO_TCP
 	pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
 	u->tcp_timeout = pd->timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
@@ -2768,7 +2768,6 @@ do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
 	{
 		struct ip_vs_timeout_user t;
 
-		memset(&t, 0, sizeof(t));
 		__ip_vs_get_timeouts(net, &t);
 		if (copy_to_user(user, &t, sizeof(t)) != 0)
 			ret = -EFAULT;

Re: [PATCH 08/16] ipvs: fix ip_vs_set_timeout debug messages

[Simon Horman]

On Sat, Oct 06, 2012 at 09:54:15AM +0000, Arnd Bergmann wrote:
> On Saturday 06 October 2012, Julian Anastasov wrote:
> > On Sat, 6 Oct 2012, Arnd Bergmann wrote:
> > > > 	Are there any CONFIG_IP_VS_PROTO_xxx options in this
> > > > default config? It is a waste of memory if IPVS is compiled
> > > > without any protocols.
> > > 
> > > They all appear to be turned off:
> > > 
> > > $ grep CONFIG_IP_VS obj-tmp/.config
> > > CONFIG_IP_VS=m
> > > CONFIG_IP_VS_DEBUG=y
> > > CONFIG_IP_VS_TAB_BITS=12
> > > # CONFIG_IP_VS_PROTO_TCP is not set
> > > # CONFIG_IP_VS_PROTO_UDP is not set
> > > # CONFIG_IP_VS_PROTO_AH_ESP is not set
> > > # CONFIG_IP_VS_PROTO_ESP is not set
> > > # CONFIG_IP_VS_PROTO_AH is not set
> > > # CONFIG_IP_VS_PROTO_SCTP is not set
> > 
> > 	Something should be changed here, may be at least
> > TCP/UDP, who knows.
> 
> I don't try to read too much into our defconfigs. We have 140 of them
> on ARM, and they are mainly useful to give a reasonable build coverage,
> but I wouldn't expect them to be actually used on that hardware.
> 
> I'll leave it up to Krzysztof to send a patch for this if he wants.
> 
> > > --- a/net/netfilter/ipvs/ip_vs_ctl.c
> > > +++ b/net/netfilter/ipvs/ip_vs_ctl.c
> > > @@ -2590,6 +2588,7 @@ __ip_vs_get_timeouts(struct net *net, struct ip_vs_timeout_user *u)
> > >  #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
> > >  	struct ip_vs_proto_data *pd;
> > >  #endif
> > 
> > 	That is what we want. If you plan another submission
> > you can add empty line before this memset and to replace
> > the __ip_vs_get_timeouts call in ip_vs_genl_set_config with
> > memset but they are cosmetic changes. Or may be Simon will
> > take care about the coding style when applying the change.
> > 
> > Acked-by: Julian Anastasov <ja@ssi.bg>
> 
> I'd prefer Simon to pick up the patch. He should also decide whether he wants
> to add it to stable. In theory, this is a small leak of kernel stack data
> to user space, but as you say in practice it should not happen because it
> only exists for silly configurations that nobody should be using.
> 
> AFAICT, removing the call to __ip_vs_get_timeouts in do_ip_vs_get_ctl would
> be a semantic change for the case where a user sends a IPVS_CMD_SET_CONFIG
> message without without the complete set of attributes inside it. The current
> behavior is to leave the timeouts alone, replacing the __ip_vs_get_timeouts
> with a memset would zero them. I left this part alone then.
> 
> 	Arnd

Hi,

sorry for being a bit slow, it was a long weekend here.
This patch looks reasonable and I think it is appropriate for stable.
I'll see about getting it merged accordingly.

> 
> 8<-----
> ipvs: initialize returned data in do_ip_vs_get_ctl
> 
> As reported by a gcc warning, the do_ip_vs_get_ctl does not initalize
> all the members of the ip_vs_timeout_user structure it returns if
> at least one of the TCP or UDP protocols is disabled for ipvs. 
> 
> This makes sure that the data is always initialized, before it is
> returned as a response to IPVS_CMD_GET_CONFIG or printed as a
> debug message in IPVS_CMD_SET_CONFIG.
> 
> Without this patch, building ARM ixp4xx_defconfig results in:
> 
> net/netfilter/ipvs/ip_vs_ctl.c: In function 'ip_vs_genl_set_cmd':
> net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.udp_timeout' may be used uninitialized in this function [-Wuninitialized]
> net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.udp_timeout' was declared here
> net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_fin_timeout' may be used uninitialized in this function [-Wuninitialized]
> net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_fin_timeout' was declared here
> net/netfilter/ipvs/ip_vs_ctl.c:2238:47: warning: 't.tcp_timeout' may be used uninitialized in this function [-Wuninitialized]
> net/netfilter/ipvs/ip_vs_ctl.c:3322:28: note: 't.tcp_timeout' was declared here
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Acked-by: Julian Anastasov <ja@ssi.bg>
> ---
> diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
> index 2770f85..c4ee437 100644
> --- a/net/netfilter/ipvs/ip_vs_ctl.c
> +++ b/net/netfilter/ipvs/ip_vs_ctl.c
> @@ -2591,6 +2589,8 @@ __ip_vs_get_timeouts(struct net *net, struct ip_vs_timeout_user *u)
>  	struct ip_vs_proto_data *pd;
>  #endif
>  
> +	memset(u, 0, sizeof (*u));
> +
>  #ifdef CONFIG_IP_VS_PROTO_TCP
>  	pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
>  	u->tcp_timeout = pd->timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
> @@ -2768,7 +2768,6 @@ do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
>  	{
>  		struct ip_vs_timeout_user t;
>  
> -		memset(&t, 0, sizeof(t));
>  		__ip_vs_get_timeouts(net, &t);
>  		if (copy_to_user(user, &t, sizeof(t)) != 0)
>  			ret = -EFAULT;
>