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Date: Tue, 14 Nov 2017 19:20:09 +0100
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 18/30] x86, kaiser: map virtually-addressed performance
 monitoring buffers
Message-ID: <20171114182009.jbhobwxlkfjb2t6i@hirez.programming.kicks-ass.net>
References: <20171110193058.BECA7D88@viggo.jf.intel.com>
 <20171110193139.B039E97B@viggo.jf.intel.com>
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In-Reply-To: <20171110193139.B039E97B@viggo.jf.intel.com>
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To: Dave Hansen <dave.hansen@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, hughd@google.com, moritz.lipp@iaik.tugraz.at, daniel.gruss@iaik.tugraz.at, michael.schwarz@iaik.tugraz.at, richard.fellner@student.tugraz.at, luto@kernel.org, torvalds@linux-foundation.org, keescook@google.com, x86@kernel.org

On Fri, Nov 10, 2017 at 11:31:39AM -0800, Dave Hansen wrote:
>  static int alloc_ds_buffer(int cpu)
>  {
> +	struct debug_store *ds = per_cpu_ptr(&cpu_debug_store, cpu);
>  
> +	memset(ds, 0, sizeof(*ds));

Still wondering about that memset...

>  	per_cpu(cpu_hw_events, cpu).ds = ds;
>  
>  	return 0;

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