linux-kernel - Re: [PATCH 18/20] staging/lustre/libcfs: get rid of debugfs/lnet/debug

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Date:	Mon, 13 Jul 2015 20:52:09 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Oleg Drokin <green@...uxhacker.ru>
Cc:	devel@...verdev.osuosl.org,
	Andreas Dilger <andreas.dilger@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 18/20] staging/lustre/libcfs: get rid of
 debugfs/lnet/debug_mb

On Mon, Jul 13, 2015 at 10:51:00PM -0400, Oleg Drokin wrote:
> 
> On Jul 13, 2015, at 10:46 PM, Greg Kroah-Hartman wrote:
> 
> > On Mon, Jul 06, 2015 at 12:48:56PM -0400, green@...uxhacker.ru wrote:
> >> From: Oleg Drokin <green@...uxhacker.ru>
> >> 
> >> It's just a fancy libcfs_debug_mb module parameter wrapper,
> >> so just add debug buffer size check and resizing and the same
> >> functionality now would be accessible via
> >> /sys/module/libcfs/parameters/libcfs_debug_mb
> >> 
> >> Also add a symlink for backwards compatibility.
> >> 
> >> Signed-off-by: Oleg Drokin <green@...uxhacker.ru>
> >> ---
> >> drivers/staging/lustre/lustre/libcfs/debug.c     | 37 ++++++++++++++++++++++--
> >> drivers/staging/lustre/lustre/libcfs/module.c    | 32 ++------------------
> >> drivers/staging/lustre/lustre/libcfs/tracefile.c | 12 --------
> >> drivers/staging/lustre/lustre/libcfs/tracefile.h |  1 -
> >> 4 files changed, 37 insertions(+), 45 deletions(-)
> >> 
> >> diff --git a/drivers/staging/lustre/lustre/libcfs/debug.c b/drivers/staging/lustre/lustre/libcfs/debug.c
> >> index 5ae7b65..e4c7129 100644
> >> --- a/drivers/staging/lustre/lustre/libcfs/debug.c
> >> +++ b/drivers/staging/lustre/lustre/libcfs/debug.c
> >> @@ -57,8 +57,39 @@ module_param(libcfs_debug, int, 0644);
> >> MODULE_PARM_DESC(libcfs_debug, "Lustre kernel debug mask");
> >> EXPORT_SYMBOL(libcfs_debug);
> >> 
> >> +static int libcfs_param_debug_mb_set(const char *val,
> >> +				     const struct kernel_param *kp)
> >> +{
> >> +	int rc;
> >> +	unsigned num;
> >> +
> >> +	rc = kstrtouint(val, 0, &num);
> >> +	if (rc == -EINVAL)
> >> +		return -EINVAL;
> >> +
> >> +	if (!*((unsigned int *)kp->arg)) {
> >> +		*((unsigned int *)kp->arg) = num;
> >> +		return 0;
> >> +	}
> >> +
> >> +	rc = cfs_trace_set_debug_mb(num);
> >> +
> >> +	if (!rc)
> >> +		*((unsigned int *)kp->arg) = cfs_trace_get_debug_mb();
> >> +
> >> +	return rc;
> >> +}
> >> +
> >> +static struct kernel_param_ops param_ops_debugmb = {
> >> +	.set = libcfs_param_debug_mb_set,
> >> +	.get = param_get_uint,
> >> +};
> >> +
> >> +#define param_check_debugmb(name, p) \
> >> +		__param_check(name, p, unsigned int)
> >> +
> >> static unsigned int libcfs_debug_mb;
> >> -module_param(libcfs_debug_mb, uint, 0644);
> >> +module_param(libcfs_debug_mb, debugmb, 0644);
> > 
> > module_param wants a variable type as the second option, not a variable
> > name, how is this working?
> 
> debugmb IS the type, that I just declared above.
> See all the param_ops_XXX and param_check_XXX thing?

Ah, missed that, sorry, my fault.

Ok, I see you resent this with a better comment, thanks for that, I'll
go queue it up now.

greg k-h
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