linux-kernel - Re: [PATCH 1/3][RFC] ftrace/ppc: Have PPC skip updating with stop

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] [day] [month] [year] [list]

Message-ID: <1339128796.3330.7.camel@concordia>
Date:	Fri, 08 Jun 2012 14:13:16 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH 1/3][RFC] ftrace/ppc: Have PPC skip updating with
 stop_machine()

On Thu, 2012-04-26 at 14:31 -0400, Steven Rostedt wrote:
> plain text document attachment
> (0001-ftrace-ppc-Have-PPC-skip-updating-with-stop_machine.patch)
> From: Steven Rostedt <srostedt@...hat.com>
> 
> PPC does not have the synchronization issues that x86 has with
> modifying code on one CPU while another CPU is executing it.
> The other CPU will either see the old or new code without any
> issues, unlike x86 which may issue a GPF.
> 
> Instead of calling the heavy stop_machine, just update the code.

This looks nice, but it's giving me this:

arch/powerpc/kernel/ftrace.c:497:13: error: static declaration of 'ftrace_replace_code' follows non-static declaration                                                
include/linux/ftrace.h:317:13: note: previous declaration of 'ftrace_replace_code' was here

I think the fix is just to make our ftrace_replace_code() non-static?

cheers


> +static void ftrace_replace_code(int enable)
> +{
> +	struct ftrace_rec_iter *iter;
> +	struct dyn_ftrace *rec;
> +	int ret;
> +
> +	for (iter = ftrace_rec_iter_start(); iter;
> +	     iter = ftrace_rec_iter_next(iter)) {
> +		rec = ftrace_rec_iter_record(iter);
> +		ret = __ftrace_replace_code(rec, enable);
> +		if (ret) {
> +			ftrace_bug(ret, rec->ip);
> +			return;
> +		}
> +	}
> +}
> +


--
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/