[PATCH tip/core/rcu 0/4] torture-test changes for 4.4

[PATCH tip/core/rcu 0/4] torture-test changes for 4.4

[Paul E. McKenney]

Hello!

This series contains torture-test changes:

1.	Fix module unwind when bad torture_type specified to rcutorture.

2.	Fix unused-function warning for torturing_tasks().

3.	Forgive non-plural arguments.

4.	Fix module unwind when bad torture_type specified to locktorture.

							Thanx, Paul

------------------------------------------------------------------------

 b/kernel/locking/locktorture.c                  |    6 +++---
 b/kernel/rcu/rcutorture.c                       |    8 ++++----
 b/tools/testing/selftests/rcutorture/bin/kvm.sh |    6 +++---
 3 files changed, 10 insertions(+), 10 deletions(-)

[PATCH tip/core/rcu 1/4] rcutorture: Fix module unwind when bad torture_type specified

[Paul E. McKenney]

The rcutorture module has a list of torture types, and specifying a
type not on this list is supposed to cleanly fail the module load.
Unfortunately, the "fail" happens without the "cleanly".  This commit
therefore adds the needed clean-up after an incorrect torture_type.

Reported-by: David Miller <davem@davemloft.net>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: David Miller <davem@davemloft.net>
---
 kernel/rcu/rcutorture.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 77192953dee5..b74b56474e17 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1742,15 +1742,15 @@ rcu_torture_init(void)
 		for (i = 0; i < ARRAY_SIZE(torture_ops); i++)
 			pr_alert(" %s", torture_ops[i]->name);
 		pr_alert("\n");
-		torture_init_end();
-		return -EINVAL;
+		firsterr = -EINVAL;
+		goto unwind;
 	}
 	if (cur_ops->fqs == NULL && fqs_duration != 0) {
 		pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n");
 		fqs_duration = 0;
 	}
 	if (cur_ops->init)
-		cur_ops->init(); /* no "goto unwind" prior to this point!!! */
+		cur_ops->init();
 
 	if (nreaders >= 0) {
 		nrealreaders = nreaders;
-- 
2.5.2

[PATCH tip/core/rcu 2/4] rcutorture: Fix unused-function warning for torturing_tasks()

[Paul E. McKenney]

The torturing_tasks() function is used only in kernels built with
CONFIG_PROVE_RCU=y, so the second definition can result in unused-function
compiler warnings.  This commit adds __maybe_unused to suppress these
warnings.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
 kernel/rcu/rcutorture.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index b74b56474e17..009b62c76dfa 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -695,7 +695,7 @@ static bool __maybe_unused torturing_tasks(void)
 
 #define RCUTORTURE_TASKS_OPS
 
-static bool torturing_tasks(void)
+static bool __maybe_unused torturing_tasks(void)
 {
 	return false;
 }
-- 
2.5.2

[PATCH tip/core/rcu 3/4] torture: Forgive non-plural arguments

[Paul E. McKenney]

This commit allows --bootarg instead of --bootargs, --config instead of
--configs, and --qemu-arg instead of --qemu-args.  For those cases where
a native English speaker might auto-correct the argument to be incorrect.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
 tools/testing/selftests/rcutorture/bin/kvm.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/rcutorture/bin/kvm.sh b/tools/testing/selftests/rcutorture/bin/kvm.sh
index fbe2dbff1e21..f6483609ebc2 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm.sh
@@ -75,7 +75,7 @@ usage () {
 while test $# -gt 0
 do
 	case "$1" in
-	--bootargs)
+	--bootargs|--bootarg)
 		checkarg --bootargs "(list of kernel boot arguments)" "$#" "$2" '.*' '^--'
 		TORTURE_BOOTARGS="$2"
 		shift
@@ -88,7 +88,7 @@ do
 	--buildonly)
 		TORTURE_BUILDONLY=1
 		;;
-	--configs)
+	--configs|--config)
 		checkarg --configs "(list of config files)" "$#" "$2" '^[^/]*$' '^--'
 		configs="$2"
 		shift
@@ -134,7 +134,7 @@ do
 	--no-initrd)
 		TORTURE_INITRD=""; export TORTURE_INITRD
 		;;
-	--qemu-args)
+	--qemu-args|--qemu-arg)
 		checkarg --qemu-args "-qemu args" $# "$2" '^-' '^error'
 		TORTURE_QEMU_ARG="$2"
 		shift
-- 
2.5.2

[PATCH tip/core/rcu 4/4] locktorture: Fix module unwind when bad torture_type specified

[Paul E. McKenney]

The locktorture module has a list of torture types, and specifying
a type not on this list is supposed to cleanly fail the module load.
Unfortunately, the "fail" happens without the "cleanly".  This commit
therefore adds the needed clean-up after an incorrect torture_type.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
 kernel/locking/locktorture.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index 32244186f1f2..820852f69858 100644
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -661,11 +661,11 @@ static int __init lock_torture_init(void)
 		for (i = 0; i < ARRAY_SIZE(torture_ops); i++)
 			pr_alert(" %s", torture_ops[i]->name);
 		pr_alert("\n");
-		torture_init_end();
-		return -EINVAL;
+		firsterr = -EINVAL;
+		goto unwind;
 	}
 	if (cxt.cur_ops->init)
-		cxt.cur_ops->init(); /* no "goto unwind" prior to this point!!! */
+		cxt.cur_ops->init();
 
 	if (nwriters_stress >= 0)
 		cxt.nrealwriters_stress = nwriters_stress;
-- 
2.5.2

Re: [PATCH tip/core/rcu 1/4] rcutorture: Fix module unwind when bad torture_type specified

[Josh Triplett]

On Tue, Oct 06, 2015 at 09:49:10AM -0700, Paul E. McKenney wrote:
> The rcutorture module has a list of torture types, and specifying a
> type not on this list is supposed to cleanly fail the module load.
> Unfortunately, the "fail" happens without the "cleanly".  This commit
> therefore adds the needed clean-up after an incorrect torture_type.
> 
> Reported-by: David Miller <davem@davemloft.net>
> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> Acked-by: David Miller <davem@davemloft.net>

After a careful review of rcu_torture_cleanup and the cur_ops->init()
functions to verify that the dire comment about not using "goto unwind"
doesn't actually apply (rcu_torture_cleanup *seems* to handle lack of
init), this seems fine.

Reviewed-by: Josh Triplett <josh@joshtriplett.org>

>  kernel/rcu/rcutorture.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
> index 77192953dee5..b74b56474e17 100644
> --- a/kernel/rcu/rcutorture.c
> +++ b/kernel/rcu/rcutorture.c
> @@ -1742,15 +1742,15 @@ rcu_torture_init(void)
>  		for (i = 0; i < ARRAY_SIZE(torture_ops); i++)
>  			pr_alert(" %s", torture_ops[i]->name);
>  		pr_alert("\n");
> -		torture_init_end();
> -		return -EINVAL;
> +		firsterr = -EINVAL;
> +		goto unwind;
>  	}
>  	if (cur_ops->fqs == NULL && fqs_duration != 0) {
>  		pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n");
>  		fqs_duration = 0;
>  	}
>  	if (cur_ops->init)
> -		cur_ops->init(); /* no "goto unwind" prior to this point!!! */
> +		cur_ops->init();
>  
>  	if (nreaders >= 0) {
>  		nrealreaders = nreaders;
> -- 
> 2.5.2
> 

Re: [PATCH tip/core/rcu 0/4] torture-test changes for 4.4

[Josh Triplett]

On Tue, Oct 06, 2015 at 09:48:55AM -0700, Paul E. McKenney wrote:
> Hello!
> 
> This series contains torture-test changes:
> 
> 1.	Fix module unwind when bad torture_type specified to rcutorture.
> 
> 2.	Fix unused-function warning for torturing_tasks().
> 
> 3.	Forgive non-plural arguments.
> 
> 4.	Fix module unwind when bad torture_type specified to locktorture.

For all four:

Reviewed-by: Josh Triplett <josh@joshtriplett.org>

Re: [PATCH tip/core/rcu 1/4] rcutorture: Fix module unwind when bad torture_type specified

[Paul E. McKenney]

On Tue, Oct 06, 2015 at 10:32:12AM -0700, Josh Triplett wrote:
> On Tue, Oct 06, 2015 at 09:49:10AM -0700, Paul E. McKenney wrote:
> > The rcutorture module has a list of torture types, and specifying a
> > type not on this list is supposed to cleanly fail the module load.
> > Unfortunately, the "fail" happens without the "cleanly".  This commit
> > therefore adds the needed clean-up after an incorrect torture_type.
> > 
> > Reported-by: David Miller <davem@davemloft.net>
> > Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> > Acked-by: David Miller <davem@davemloft.net>
> 
> After a careful review of rcu_torture_cleanup and the cur_ops->init()
> functions to verify that the dire comment about not using "goto unwind"
> doesn't actually apply (rcu_torture_cleanup *seems* to handle lack of
> init), this seems fine.

I was indeed a bit nervous about removing that comment, so thank you for
checking up on it!  (Can't be bothered to go back and figure out if it
ever really was relevant...)

								Thanx, Paul

> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
> 
> >  kernel/rcu/rcutorture.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
> > index 77192953dee5..b74b56474e17 100644
> > --- a/kernel/rcu/rcutorture.c
> > +++ b/kernel/rcu/rcutorture.c
> > @@ -1742,15 +1742,15 @@ rcu_torture_init(void)
> >  		for (i = 0; i < ARRAY_SIZE(torture_ops); i++)
> >  			pr_alert(" %s", torture_ops[i]->name);
> >  		pr_alert("\n");
> > -		torture_init_end();
> > -		return -EINVAL;
> > +		firsterr = -EINVAL;
> > +		goto unwind;
> >  	}
> >  	if (cur_ops->fqs == NULL && fqs_duration != 0) {
> >  		pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n");
> >  		fqs_duration = 0;
> >  	}
> >  	if (cur_ops->init)
> > -		cur_ops->init(); /* no "goto unwind" prior to this point!!! */
> > +		cur_ops->init();
> >  
> >  	if (nreaders >= 0) {
> >  		nrealreaders = nreaders;
> > -- 
> > 2.5.2
> > 
>