linux-kernel - Re: [PATCH 00/14] tracing: add compat syscall support v3

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Date:	Fri, 21 May 2010 19:40:21 +1000
From:	Ian Munsie <imunsie@....ibm.com>
To:	Jason Baron <jbaron@...hat.com>
Cc:	fweisbec <fweisbec@...il.com>, mingo <mingo@...e.hu>,
	rostedt <rostedt@...dmis.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/14] tracing: add compat syscall support v3

Hi Jason,

I'm currently in the process of implementing syscall tracepoints for
PowerPC, and a considerable amount of my work is going to end up
requiring these patches of yours. I've reviewed and tested your patches
(and spent a good chunk of time rebasing them on top of
tip/tracing/core) and they all seem pretty good.

I *particularly* like the way in which they prevent ftrace syscalls from
reporting that sys_swapoff was constantly firing on x86_64 kernels with
a 32bit userspace ;)

Anyway, I'm just wondering if you have an ETA for the v4 patchset to
address the remaining issues that Frederic raised so that they can be
merged.

Cheers,
-Ian

Excerpts from Jason Baron's message of Wed Mar 17 04:46:08 +1100 2010:
> Hi,
> 
> Re-post to add infrastructure for compat syscall event tracing support. This
> patch series also adds x86_64 arch specific support as an example consumer
> of the new infrastructure.
> 
> Arches can request compat syscall tracing by setting: 
> __HAVE_ARCH_FTRACE_COMPAT_SYSCALLS, if CONFIG_COMPAT and CONFIG_FTRACE_SYSCALLS
> are set. Arches then need to implement the following interfaces:
> 
> 1) int is_compat_task(void);
>   - most arches seem to have this already
> 2) unsigned long arch_compat_syscall_addr(int nr);
>   - returns a pointer to the compat syscall entry corresponding to syscall 'nr'
> 3) int NR_syscalls_compat;
>   - number of entries in the compat syscall table.
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