netdev - Re: [PATCH v2] net: filter: BPF 'JIT' compiler for PPC64

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

Date:	Tue, 19 Jul 2011 17:55:35 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Matt Evans <matt@...abs.org>, netdev@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2] net: filter: BPF 'JIT' compiler for PPC64

On Tue, 2011-07-19 at 08:51 +0200, Eric Dumazet wrote:

> > +		case BPF_S_ANC_CPU:
> > +#ifdef CONFIG_SMP
> > +			/*
> > +			 * PACA ptr is r13:
> > +			 * raw_smp_processor_id() = local_paca->paca_index
> > +			 */
> 
> This could break if one day linux supports more than 65536 cpus :)
> 
> > +			PPC_LHZ_OFFS(r_A, 13,
> > +				     offsetof(struct paca_struct, paca_index));
> > +#else
> > +			PPC_LI(r_A, 0);
> > +#endif
> > +			break;

As would our implementation of raw_smp_processor_id() and our
spinlocks :-) I don't think we need to fix that -now- but you are
welcome to add something like a
BUILD_BUG_ON(sizeof(local_paca->paca_index) != 2); as a reminder :-)

Cheers,
Ben.


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html