netdev - Re: rhashtable: Use __vmalloc with GFP

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20151205070603.GB23255@gondor.apana.org.au>
Date:	Sat, 5 Dec 2015 15:06:03 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Phil Sutter <phil@....cc>, Eric Dumazet <eric.dumazet@...il.com>,
	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, tgraf@...g.ch,
	fengguang.wu@...el.com, wfg@...ux.intel.com, lkp@...org
Subject: Re: rhashtable: Use __vmalloc with GFP_ATOMIC for table allocation

On Fri, Dec 04, 2015 at 07:15:55PM +0100, Phil Sutter wrote:
>
> > Only one should really do this, while others are waiting.
> 
> Sure, that was my previous understanding of how this thing works.

Yes that's clearly how it should be.  Unfortunately while adding
the locking to do this, I found out that you can't actually call
__vmalloc with BH disabled so this is a no-go.

Unless we can make __vmalloc work with BH disabled, I guess we'll
have to go back to multi-level lookups unless someone has a better
suggestion.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
--
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