linux-kernel - Re: [PATCH 4/6] tracing: add tracing support for compat syscalls

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Date:	Wed, 3 Feb 2010 13:52:51 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Jason Baron <jbaron@...hat.com>
Cc:	linux-kernel@...r.kernel.org, laijs@...fujitsu.com,
	lizf@...fujitsu.com, rostedt@...dmis.org, fweisbec@...il.com,
	mingo@...e.hu, hpa@...or.com, tglx@...utronix.de,
	mhiramat@...hat.com
Subject: Re: [PATCH 4/6] tracing: add tracing support for compat syscalls

On Tue, Feb 02, 2010 at 04:21:51PM -0500, Jason Baron wrote:
> Add core support to event tracing for compat syscalls. The basic idea is that we
> check if we have a compat task via 'is_compat_task()'. If so, we lookup in the
> new compat_syscalls_metadata table, the corresponding struct syscall_metadata, to
> check syscall arguments and whether or not we are enabled.
> 
> Signed-off-by: Jason Baron <jbaron@...hat.com>
> ---
>  include/linux/compat.h        |    8 +++++
>  include/trace/syscall.h       |    4 ++
>  kernel/trace/trace.h          |    2 +
>  kernel/trace/trace_syscalls.c |   63 +++++++++++++++++++++++++++++++++++-----
>  4 files changed, 69 insertions(+), 8 deletions(-)
> 
> diff --git a/include/linux/compat.h b/include/linux/compat.h
> index ef68119..ab2cda2 100644
> --- a/include/linux/compat.h
> +++ b/include/linux/compat.h
> @@ -353,5 +353,13 @@ asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user * filename,
>  asmlinkage long compat_sys_openat(unsigned int dfd, const char __user *filename,
>  				  int flags, int mode);
> 
> +#else /* CONFIG_COMPAT */
> +
> +#define NR_syscalls_compat 0
> +static inline int is_compat_task(void)
> +{
> +	return 0;
> +}
> +
>  #endif /* CONFIG_COMPAT */
>  #endif /* _LINUX_COMPAT_H */

This part will break compilation on s390, since it has already the same
function defined for !CONFIG_COMPAT.
In order to avoid the whole ifdef mess some s390 files do include
asm/compat.h instead of linux/compat.h. This will get messy :)
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