linux-kernel - Re: [PATCH v2][RESEND] perf, x86: Fix multi-segment problem of perf_event_intel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Tue, 1 Sep 2015 13:39:39 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Taku Izumi <izumi.taku@...fujitsu.com>,
	linux-kernel@...r.kernel.org, mingo@...hat.com, acme@...nel.org,
	hpa@...or.com, x86@...nel.org, jolsa@...hat.com
Subject: Re: [PATCH v2][RESEND] perf, x86: Fix multi-segment problem of
 perf_event_intel_uncore

On Tue, Sep 01, 2015 at 01:31:47PM +0200, Ingo Molnar wrote:
> 
> * Peter Zijlstra <peterz@...radead.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.

I tend to agree, it makes the whole thing rather fragile...
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/