linux-kernel - Re: [PATCH 1/3] jump label: add enabled/disabled state to jump label key entries

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:	Wed, 24 Nov 2010 10:53:17 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jason Baron <jbaron@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, mingo@...e.hu,
	mathieu.desnoyers@...ymtl.ca, hpa@...or.com, tglx@...utronix.de,
	andi@...stfloor.org, roland@...hat.com, rth@...hat.com,
	masami.hiramatsu.pt@...achi.com, fweisbec@...il.com,
	avi@...hat.com, davem@...emloft.net, sam@...nborg.org,
	ddaney@...iumnetworks.com, michael@...erman.id.au,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] jump label: add enabled/disabled state to jump
 label key entries

On Wed, 2010-11-24 at 10:42 -0500, Jason Baron wrote:

> > And I think the only arch where you can do text pokes without cross-cpu
> > synchronization is one that doesn't have SMP support.
> > 
> > 
> 
> is this really true?
> 
> The powerpc implementation uses patch_instruction():
> 
> 
> arch/powerpc/lib/code-patching.c:
> 
> void patch_instruction(unsigned int *addr, unsigned int instr)
> {
>         *addr = instr;
>         asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r"
> (addr));
> }

Is this ever called outside of boot up? After SMP is enabled? (besides
for creating trampolines, before they are used).

-- Steve


--
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/