linux-kernel - Re: [PATCH 1/2] test_xarray: add tests for advanced multi-index use

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Date: Fri, 26 Jan 2024 11:12:03 -0800
From: Luis Chamberlain <mcgrof@...nel.org>
To: Matthew Wilcox <willy@...radead.org>
Cc: kernel test robot <oliver.sang@...el.com>,
	Daniel Gomez <da.gomez@...sung.com>, oe-lkp@...ts.linux.dev,
	lkp@...el.com, linux-kernel@...r.kernel.org,
	"gost.dev@...sung.com" <gost.dev@...sung.com>,
	Pankaj Raghav <p.raghav@...sung.com>
Subject: Re: [PATCH 1/2] test_xarray: add tests for advanced multi-index use

On Fri, Nov 17, 2023 at 01:01:18PM -0800, Luis Chamberlain wrote:
> On Fri, Nov 17, 2023 at 08:58:05PM +0000, Matthew Wilcox wrote:
> > On Fri, Nov 17, 2023 at 12:54:09PM -0800, Luis Chamberlain wrote:
> > > +/*
> > > + * Can be used in contexts which busy loop on large number of entries but can
> > > + * sleep and timing is if no importance to test correctness.
> > > + */
> > > +#define XA_BUG_ON_RELAX(xa, x) do {				\
> > > +	if ((tests_run % 1000) == 0)				\
> > > +		schedule();					\
> > > +	XA_BUG_ON(xa, x);					\
> > > +} while (0)
> > 
> > That is awful.  Please don't do that.  You're mixing two completely
> > unrelated thing into the same macro, which makes no sense.  Not only
> > that, it's a macro which refers to something in the containing
> > environment that isn't a paramter to the macro.
> 
> I figured you'd puke. Would you prefer I just open code the check on the loop
> though? I'm sure another alternative is we *not care* about these
> overloaded systems running the test. What would you prefer?

OK without any particular preferences outlined this is what I have,
splitting the two contexts and making the busy loop fix clearer.

+#define XA_BUSY_LOOP_RELAX(xa, x) do {                         \
+       if ((i % 1000) == 0)                                    \
+               schedule();                                     \
+} while (0)
+
+/*
+ * Can be used in contexts which busy loop on large number of entries but can
+ * sleep and timing is if no importance to test correctness.
+ */
+#define XA_BUG_ON_RELAX(i, xa, x) do {                         \
+       XA_BUSY_LOOP_RELAX(i);                                  \
+       XA_BUG_ON(xa, x);                                       \
+} while (0)

Thoughts?

  Luis