linux-kernel - Re: [RFC][PATCH 01/12 v3] x86/kvm/tracing: Use helper function trace_seq_buffer

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Message-ID: <20141105102814.GA4570@pathway.suse.cz>
Date:	Wed, 5 Nov 2014 11:28:14 +0100
From:	Petr Mladek <pmladek@...e.cz>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mark Rustad <mark.d.rustad@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [RFC][PATCH 01/12 v3] x86/kvm/tracing: Use helper function
 trace_seq_buffer_ptr()

On Tue 2014-11-04 10:52:38, Steven Rostedt wrote:
> From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> 
> To allow for the restructiong of the trace_seq code, we need users
> of it to use the helper functions instead of accessing the internals
> of the trace_seq structure itself.
> 
> Cc: Mark Rustad <mark.d.rustad@...el.com>
> Cc: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>

Reviewed-by: Petr Mladek <pmladek@...e.cz>

Best Regards,
Petr

> ---
>  arch/x86/kvm/mmutrace.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h
> index 5aaf35641768..ce463a9cc8fb 100644
> --- a/arch/x86/kvm/mmutrace.h
> +++ b/arch/x86/kvm/mmutrace.h
> @@ -22,7 +22,7 @@
>  	__entry->unsync = sp->unsync;
>  
>  #define KVM_MMU_PAGE_PRINTK() ({				        \
> -	const u32 saved_len = p->len;					\
> +	const char *saved_ptr = trace_seq_buffer_ptr(p);		\
>  	static const char *access_str[] = {			        \
>  		"---", "--x", "w--", "w-x", "-u-", "-ux", "wu-", "wux"  \
>  	};							        \
> @@ -41,7 +41,7 @@
>  			 role.nxe ? "" : "!",				\
>  			 __entry->root_count,				\
>  			 __entry->unsync ? "unsync" : "sync", 0);	\
> -	p->buffer + saved_len;						\
> +	saved_ptr;							\
>  		})
>  
>  #define kvm_mmu_trace_pferr_flags       \
> -- 
> 2.1.1
> 
> 
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