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Date: Tue, 1 Sep 2015 13:31:47 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Taku Izumi <izumi.taku@jp.fujitsu.com>, linux-kernel@vger.kernel.org,
        mingo@redhat.com, acme@kernel.org, hpa@zytor.com, x86@kernel.org,
        jolsa@redhat.com
Subject: Re: [PATCH v2][RESEND] perf, x86: Fix multi-segment problem of
 perf_event_intel_uncore
Message-ID: <20150901113147.GA11161@gmail.com>
References: <1440672872-129663-1-git-send-email-izumi.taku@jp.fujitsu.com>
 <20150901111533.GQ19282@twins.programming.kicks-ass.net>
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* Peter Zijlstra <peterz@infradead.org> wrote:

> +struct __find_pci2phy(int segment)
> +{
> +	struct pci2phy_map *map;
> +
> +	lockdep_assert_held(&pci2phy_map_lock);
> +
> +	list_for_each_entry(map, &pci2phy_map_head, list) {
> +		if (map->segment == segment)
> +			return map;
> +	}
> +
> +	map = kmalloc(sizeof(struct pci2phy_map), GFP_ATOMIC);

I really don't think we should be adding new GFP_ATOMIC allocations whenever it 
can be avoided.

Thanks,

	Ingo