linux-kernel - Re: [PATCH] 2.6.18-rt7: fix more issues with 32-bit cycles_t in latency

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]

Message-ID: <4574149B.5070602@ru.mvista.com>
Date:	Mon, 04 Dec 2006 15:29:15 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	dwalker@...sta.com
Subject: Re: [PATCH] 2.6.18-rt7: fix more issues with 32-bit cycles_t in	latency_trace.c
 (take 3)

Hello.

Ingo Molnar wrote:

>>   What was the destiny of that patch? I haven't seen it accepted, 
>>haven't seen any comments... while this is not a mere warning fix. 
>>What am I expected to do to get it accepted -- recast it against 
>>2.6.19-rt1?

> i'd suggest to redo it - but please keep it simple and clean. Those 
> dozens of casts to u64 are quite ugly.

    Alas, there's *nothing* I can do about it with 32-bit cycles_t. And if you 
look at the kernel, this is not the only case of such "ugliness", look at this 
commit for example:

http://www.kernel.org/git/?p=linux/kernel/git/paulus/powerpc.git;a=commit;h=685143ac1f7a579a3fac9c7f2ac8f82e95af6864

> Why is cycles_t 32-bits on some 
> of the arches to begin with?

    I guess this was done for speed reasons. That's not a qustion for me 
although...

> 	Ingo

WBR, Sergei
-
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/