linux-kernel - Re: [GIT PULL] hw-breakpoint fix

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Date:	Thu, 11 Feb 2010 16:42:11 +0530
From:	Mahesh Jagannath Salgaonkar <mahesh@...ux.vnet.ibm.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	"K. Prasad" <prasad@...ux.vnet.ibm.com>,
	Maneesh Soni <maneesh@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin <schwidefsky@...ibm.com>
Subject: Re: [GIT PULL] hw-breakpoint fix

Hi Ingo,

Will this patch be pushed in to Linux tree? This patch contains ABI 
chnage w.r.t hardware breakpoint info layout and needs to go in .33

Thanks,
-Mahesh.

On 02/04/2010 07:16 AM, Frederic Weisbecker wrote:
> Ingo,
>
> Please pull the perf/urgent branch that can be found at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git
> 	perf/urgent
>
> Thanks,
> 	Frederic
> ---
>
> Mahesh Salgaonkar (1):
>        perf: Make bp_len type to u64 generic across the arch
>
>
>   include/linux/hw_breakpoint.h |    2 +-
>   include/linux/perf_event.h    |    6 ++----
>   kernel/hw_breakpoint.c        |    2 +-
>   kernel/perf_event.c           |    2 +-
>   4 files changed, 5 insertions(+), 7 deletions(-)
>
> ---
> commit cd757645fbdc34a8343c04bb0e74e06fccc2cb10
> Author: Mahesh Salgaonkar<mahesh@...ux.vnet.ibm.com>
> Date:   Sat Jan 30 10:25:18 2010 +0530
>
>      perf: Make bp_len type to u64 generic across the arch
>
>      Change 'bp_len' type to __u64 to make it work across archs as
>      the s390 architecture watch point length can be upto 2^64.
>
>      reference:
>      	http://lkml.org/lkml/2010/1/25/212
>
>      This is an ABI change that is not backward compatible with
>      the previous hardware breakpoint info layout integrated in this
>      development cycle, a rebuilt of perf tools is necessary for
>      versions based on 2.6.33-rc1 - 2.6.33-rc6 to work with a
>      kernel based on this patch.
>
>      Signed-off-by: Mahesh Salgaonkar<mahesh@...ux.vnet.ibm.com>
>      Acked-by: Peter Zijlstra<peterz@...radead.org>
>      Cc: Ananth N Mavinakayanahalli<ananth@...ibm.com>
>      Cc: "K. Prasad"<prasad@...ux.vnet.ibm.com>
>      Cc: Maneesh Soni<maneesh@...ibm.com>
>      Cc: Heiko Carstens<heiko.carstens@...ibm.com>
>      Cc: Martin<schwidefsky@...ibm.com>
>      LKML-Reference:<20100130045518.GA20776@...ibm.com>
>      Signed-off-by: Frederic Weisbecker<fweisbec@...il.com>
>
> diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h
> index 070ba06..5977b72 100644
> --- a/include/linux/hw_breakpoint.h
> +++ b/include/linux/hw_breakpoint.h
> @@ -44,7 +44,7 @@ static inline int hw_breakpoint_type(struct perf_event *bp)
>   	return bp->attr.bp_type;
>   }
>
> -static inline int hw_breakpoint_len(struct perf_event *bp)
> +static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
>   {
>   	return bp->attr.bp_len;
>   }
> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> index 8fa7187..a177698 100644
> --- a/include/linux/perf_event.h
> +++ b/include/linux/perf_event.h
> @@ -211,11 +211,9 @@ struct perf_event_attr {
>   		__u32		wakeup_watermark; /* bytes before wakeup   */
>   	};
>
> -	__u32			__reserved_2;
> -
> -	__u64			bp_addr;
>   	__u32			bp_type;
> -	__u32			bp_len;
> +	__u64			bp_addr;
> +	__u64			bp_len;
>   };
>
>   /*
> diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
> index 8a5c7d5..967e661 100644
> --- a/kernel/hw_breakpoint.c
> +++ b/kernel/hw_breakpoint.c
> @@ -360,8 +360,8 @@ EXPORT_SYMBOL_GPL(register_user_hw_breakpoint);
>   int modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr)
>   {
>   	u64 old_addr = bp->attr.bp_addr;
> +	u64 old_len = bp->attr.bp_len;
>   	int old_type = bp->attr.bp_type;
> -	int old_len = bp->attr.bp_len;
>   	int err = 0;
>
>   	perf_event_disable(bp);
> diff --git a/kernel/perf_event.c b/kernel/perf_event.c
> index d27746b..2b19297 100644
> --- a/kernel/perf_event.c
> +++ b/kernel/perf_event.c
> @@ -4580,7 +4580,7 @@ static int perf_copy_attr(struct perf_event_attr __user *uattr,
>   	if (attr->type>= PERF_TYPE_MAX)
>   		return -EINVAL;
>
> -	if (attr->__reserved_1 || attr->__reserved_2)
> +	if (attr->__reserved_1)
>   		return -EINVAL;
>
>   	if (attr->sample_type&  ~(PERF_SAMPLE_MAX-1))

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