Re: [PATCH] tools/testing/cxl: Remove cxl_test modulo math loading messages

[Alison Schofield <alison.schofield@intel.com>]

On Mon, Jan 23, 2023 at 04:30:46PM -0800, Ira Weiny wrote:
> alison.schofield@ wrote:
> > From: Alison Schofield <alison.schofield@intel.com>
> > 
> > Commit "cxl/acpi: Support CXL XOR Interleave Math (CXIMS)" added
> > a module parameter to cxl_test for the interleave_arithmetic option.
> > In doing so, it also added this dev_dbg() message describing which
> > option cxl_test used during load:
> > "[  111.743246] (NULL device *): cxl_test loading modulo math option"
> > 
> > That "(NULL device *)" has raised needless user concern and the info
> > emitted can be discovered elsewhere.
> > 
> > Remove the dev_dbg() messages and make the module_param readable via
> > sysfs in case a lookup is wanted.
> > 
> > The default option is for standard modulo arithmetic, so when the
> > interleave_arithmetic param is not present in sysfs, the cxl_test
> > module is using standard modulo arithmetic.
> 
> Is this correct?  I'm always unsure of myself with the module_param code
> but I believe the sysfs will always be there but the value would be
> "Modulo:0", wouldn't it?
> 
You are right. I made that statement based on some trial/error, and I
guess mostly error, because when I go back around to it now, it operates
just like you say. Thanks!

> > 
> > Fixes: f9db85bfec0d ("cxl/acpi: Support CXL XOR Interleave Math (CXIMS)")
> 
> I'm not sure this is the correct patch for the fixes.
> 
> Would it be?
> 
> Fixes: 7a7e6edfca85 ("tools/testing/cxl: Add XOR Math support to cxl_test") 

Yes. Thanks Ira.

I'll rev this more carefully, and also update the commit msg.
It should have said 'cxl_test module' not 'cxl_test modulo'.

Alison

> 
> Ira
> 
> > Suggested-by: Dan Williams <dan.j.williams@intel.com>
> > Signed-off-by: Alison Schofield <alison.schofield@intel.com>
> > ---
> >  tools/testing/cxl/test/cxl.c | 4 +---
> >  1 file changed, 1 insertion(+), 3 deletions(-)
> > 
> > diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c
> > index 30ee680d38ff..ede84de69f59 100644
> > --- a/tools/testing/cxl/test/cxl.c
> > +++ b/tools/testing/cxl/test/cxl.c
> > @@ -1135,11 +1135,9 @@ static __init int cxl_test_init(void)
> >  	if (interleave_arithmetic == 1) {
> >  		cfmws_start = CFMWS_XOR_ARRAY_START;
> >  		cfmws_end = CFMWS_XOR_ARRAY_END;
> > -		dev_dbg(NULL, "cxl_test loading xor math option\n");
> >  	} else {
> >  		cfmws_start = CFMWS_MOD_ARRAY_START;
> >  		cfmws_end = CFMWS_MOD_ARRAY_END;
> > -		dev_dbg(NULL, "cxl_test loading modulo math option\n");
> >  	}
> >  
> >  	rc = populate_cedt();
> > @@ -1326,7 +1324,7 @@ static __exit void cxl_test_exit(void)
> >  	unregister_cxl_mock_ops(&cxl_mock_ops);
> >  }
> >  
> > -module_param(interleave_arithmetic, int, 0000);
> > +module_param(interleave_arithmetic, int, 0444);
> >  MODULE_PARM_DESC(interleave_arithmetic, "Modulo:0, XOR:1");
> >  module_init(cxl_test_init);
> >  module_exit(cxl_test_exit);
> > 
> > base-commit: 589c3357370a596ef7c99c00baca8ac799fce531
> > -- 
> > 2.37.3
> > 
> 
>