[PATCH] IB/hfi1: Using kfree_rcu() to simplify the code

[PATCH] IB/hfi1: Using kfree_rcu() to simplify the code

[Wei Yongjun]

The callback function of call_rcu() just calls a kfree(), so we
can use kfree_rcu() instead of call_rcu() + callback function.

Signed-off-by: Wei Yongjun <weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/infiniband/hw/hfi1/mad.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/mad.c b/drivers/infiniband/hw/hfi1/mad.c
index 1263abe..95c43e1 100644
--- a/drivers/infiniband/hw/hfi1/mad.c
+++ b/drivers/infiniband/hw/hfi1/mad.c
@@ -3398,7 +3398,7 @@ static void apply_cc_state(struct hfi1_pportdata *ppd)
 
 	spin_unlock(&ppd->cc_state_lock);
 
-	call_rcu(&old_cc_state->rcu, cc_state_reclaim);
+	kfree_rcu(old_cc_state, rcu);
 }
 
 static int __subn_set_opa_cong_setting(struct opa_smp *smp, u32 am, u8 *data,
@@ -3553,13 +3553,6 @@ static int __subn_get_opa_cc_table(struct opa_smp *smp, u32 am, u8 *data,
 	return reply((struct ib_mad_hdr *)smp);
 }
 
-void cc_state_reclaim(struct rcu_head *rcu)
-{
-	struct cc_state *cc_state = container_of(rcu, struct cc_state, rcu);
-
-	kfree(cc_state);
-}
-
 static int __subn_set_opa_cc_table(struct opa_smp *smp, u32 am, u8 *data,
 				   struct ib_device *ibdev, u8 port,
 				   u32 *resp_len)



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Re: [PATCH] IB/hfi1: Using kfree_rcu() to simplify the code

[kbuild test robot]

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Hi Wei,

[auto build test ERROR on rdma/master]
[also build test ERROR on v4.8-rc1 next-20160805]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Wei-Yongjun/IB-hfi1-Using-kfree_rcu-to-simplify-the-code/20160808-175215
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma.git master
config: x86_64-randconfig-n0-08082041 (attached as .config)
compiler: gcc-4.8 (Debian 4.8.4-1) 4.8.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `postinit_cleanup':
>> init.c:(.text+0x589e7a): undefined reference to `cc_state_reclaim'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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Re: [PATCH] IB/hfi1: Using kfree_rcu() to simplify the code

[kbuild test robot]

Hi Wei,

[auto build test ERROR on rdma/master]
[also build test ERROR on v4.8-rc1 next-20160808]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Wei-Yongjun/IB-hfi1-Using-kfree_rcu-to-simplify-the-code/20160808-175215
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma.git master
config: x86_64-allmodconfig
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        make ARCH=x86_64  allmodconfig
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

>> ERROR: "cc_state_reclaim" [drivers/infiniband/hw/hfi1/hfi1.ko] undefined!

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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RE: [PATCH] IB/hfi1: Using kfree_rcu() to simplify the code

[Marciniszyn, Mike]

> -----Original Message-----
> From: Wei Yongjun [mailto:weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]
> Sent: Monday, August 8, 2016 5:50 AM
> To: Marciniszyn, Mike <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>; Dalessandro, Dennis
> <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>; Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>;
> Hefty, Sean <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>; Hal Rosenstock
> <hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Cc: Wei Yongjun <weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>; linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> Subject: [PATCH] IB/hfi1: Using kfree_rcu() to simplify the code
> 
> The callback function of call_rcu() just calls a kfree(), so we can use
> kfree_rcu() instead of call_rcu() + callback function.
> 
> Signed-off-by: Wei Yongjun <weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---
>  drivers/infiniband/hw/hfi1/mad.c | 9 +--------
>  1 file changed, 1 insertion(+), 8 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/hfi1/mad.c
> b/drivers/infiniband/hw/hfi1/mad.c
> index 1263abe..95c43e1 100644
> --- a/drivers/infiniband/hw/hfi1/mad.c
> +++ b/drivers/infiniband/hw/hfi1/mad.c
> @@ -3398,7 +3398,7 @@ static void apply_cc_state(struct hfi1_pportdata
> *ppd)
> 
>  	spin_unlock(&ppd->cc_state_lock);
> 
> -	call_rcu(&old_cc_state->rcu, cc_state_reclaim);
> +	kfree_rcu(old_cc_state, rcu);
>  }
> 

This patch misses another call_rcu() that needs to be replaced in cleanup_device_data()
and that seems to be causing 0day issues.

Doug, have you put this anywhere to elicit the 0day issues?

Nacked-by: Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> 


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Re: [PATCH] IB/hfi1: Using kfree_rcu() to simplify the code

[Leon Romanovsky]

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On Tue, Aug 09, 2016 at 04:20:08PM +0000, Marciniszyn, Mike wrote:
> 
> 
> > -----Original Message-----
> > From: Wei Yongjun [mailto:weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]
> > Sent: Monday, August 8, 2016 5:50 AM
> > To: Marciniszyn, Mike <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>; Dalessandro, Dennis
> > <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>; Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>;
> > Hefty, Sean <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>; Hal Rosenstock
> > <hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > Cc: Wei Yongjun <weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>; linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> > Subject: [PATCH] IB/hfi1: Using kfree_rcu() to simplify the code
> > 
> > The callback function of call_rcu() just calls a kfree(), so we can use
> > kfree_rcu() instead of call_rcu() + callback function.
> > 
> > Signed-off-by: Wei Yongjun <weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > ---
> >  drivers/infiniband/hw/hfi1/mad.c | 9 +--------
> >  1 file changed, 1 insertion(+), 8 deletions(-)
> > 
> > diff --git a/drivers/infiniband/hw/hfi1/mad.c
> > b/drivers/infiniband/hw/hfi1/mad.c
> > index 1263abe..95c43e1 100644
> > --- a/drivers/infiniband/hw/hfi1/mad.c
> > +++ b/drivers/infiniband/hw/hfi1/mad.c
> > @@ -3398,7 +3398,7 @@ static void apply_cc_state(struct hfi1_pportdata
> > *ppd)
> > 
> >  	spin_unlock(&ppd->cc_state_lock);
> > 
> > -	call_rcu(&old_cc_state->rcu, cc_state_reclaim);
> > +	kfree_rcu(old_cc_state, rcu);
> >  }
> > 
> 
> This patch misses another call_rcu() that needs to be replaced in cleanup_device_data()
> and that seems to be causing 0day issues.
> 
> Doug, have you put this anywhere to elicit the 0day issues?

0day bot runs on patches in mailing list too.

> 
> Nacked-by: Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> 
> 
> 
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[PATCH v2] IB/hfi1: Using kfree_rcu() to simplify the code

[Wei Yongjun]

The callback function of call_rcu() just calls a kfree(), so we
can use kfree_rcu() instead of call_rcu() + callback function.

Signed-off-by: Wei Yongjun <weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/infiniband/hw/hfi1/hfi.h  | 1 -
 drivers/infiniband/hw/hfi1/init.c | 2 +-
 drivers/infiniband/hw/hfi1/mad.c  | 9 +--------
 3 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/hfi.h b/drivers/infiniband/hw/hfi1/hfi.h
index 1000e0f..f41414e 100644
--- a/drivers/infiniband/hw/hfi1/hfi.h
+++ b/drivers/infiniband/hw/hfi1/hfi.h
@@ -1656,7 +1656,6 @@ struct cc_state *get_cc_state_protected(struct hfi1_pportdata *ppd)
 struct hfi1_devdata *hfi1_init_dd(struct pci_dev *,
 				  const struct pci_device_id *);
 void hfi1_free_devdata(struct hfi1_devdata *);
-void cc_state_reclaim(struct rcu_head *rcu);
 struct hfi1_devdata *hfi1_alloc_devdata(struct pci_dev *pdev, size_t extra);
 
 /* LED beaconing functions */
diff --git a/drivers/infiniband/hw/hfi1/init.c b/drivers/infiniband/hw/hfi1/init.c
index a358d23..b793545 100644
--- a/drivers/infiniband/hw/hfi1/init.c
+++ b/drivers/infiniband/hw/hfi1/init.c
@@ -1333,7 +1333,7 @@ static void cleanup_device_data(struct hfi1_devdata *dd)
 		spin_unlock(&ppd->cc_state_lock);
 
 		if (cc_state)
-			call_rcu(&cc_state->rcu, cc_state_reclaim);
+			kfree_rcu(cc_state, rcu);
 	}
 
 	free_credit_return(dd);
diff --git a/drivers/infiniband/hw/hfi1/mad.c b/drivers/infiniband/hw/hfi1/mad.c
index 1263abe..95c43e1 100644
--- a/drivers/infiniband/hw/hfi1/mad.c
+++ b/drivers/infiniband/hw/hfi1/mad.c
@@ -3398,7 +3398,7 @@ static void apply_cc_state(struct hfi1_pportdata *ppd)
 
 	spin_unlock(&ppd->cc_state_lock);
 
-	call_rcu(&old_cc_state->rcu, cc_state_reclaim);
+	kfree_rcu(old_cc_state, rcu);
 }
 
 static int __subn_set_opa_cong_setting(struct opa_smp *smp, u32 am, u8 *data,
@@ -3553,13 +3553,6 @@ static int __subn_get_opa_cc_table(struct opa_smp *smp, u32 am, u8 *data,
 	return reply((struct ib_mad_hdr *)smp);
 }
 
-void cc_state_reclaim(struct rcu_head *rcu)
-{
-	struct cc_state *cc_state = container_of(rcu, struct cc_state, rcu);
-
-	kfree(cc_state);
-}
-
 static int __subn_set_opa_cc_table(struct opa_smp *smp, u32 am, u8 *data,
 				   struct ib_device *ibdev, u8 port,
 				   u32 *resp_len)

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RE: [PATCH v2] IB/hfi1: Using kfree_rcu() to simplify the code

[Marciniszyn, Mike]

> From: Wei Yongjun [mailto:weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]
> Subject: [PATCH v2] IB/hfi1: Using kfree_rcu() to simplify the code
> 
> The callback function of call_rcu() just calls a kfree(), so we can use
> kfree_rcu() instead of call_rcu() + callback function.
> 
> Signed-off-by: Wei Yongjun <weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

Tested-by: Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Acked-by: Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
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Re: [PATCH v2] IB/hfi1: Using kfree_rcu() to simplify the code

[Doug Ledford]

[-- Attachment #1.1: Type: text/plain, Size: 733 bytes --]

On 8/10/2016 10:56 AM, Marciniszyn, Mike wrote:
>> From: Wei Yongjun [mailto:weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]
>> Subject: [PATCH v2] IB/hfi1: Using kfree_rcu() to simplify the code
>>
>> The callback function of call_rcu() just calls a kfree(), so we can use
>> kfree_rcu() instead of call_rcu() + callback function.
>>
>> Signed-off-by: Wei Yongjun <weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> 
> Tested-by: Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> Acked-by: Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> 

Thanks, applied.

-- 
Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
    GPG Key ID: 0E572FDD


[-- Attachment #2: OpenPGP digital signature --]
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RE: [PATCH v2] IB/hfi1: Using kfree_rcu() to simplify the code

[Marciniszyn, Mike]

> From: Wei Yongjun [mailto:weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]
> Subject: [PATCH v2] IB/hfi1: Using kfree_rcu() to simplify the code
> 
> The callback function of call_rcu() just calls a kfree(), so we can use
> kfree_rcu() instead of call_rcu() + callback function.
> 
> Signed-off-by: Wei Yongjun <weiyj.lk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

[resent, didn't make the list]

Tested-by: Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Acked-by: Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
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