linux-kernel - Re: [PATCH v4 2/4] memblock tests: add verbose output to memblock tests

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Date:   Wed, 29 Jun 2022 12:07:34 -0500
From:   Rebecca Mckeever <remckee0@...il.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     Mike Rapoport <rppt@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/4] memblock tests: add verbose output to memblock
 tests

On Wed, Jun 29, 2022 at 01:34:54PM +0200, David Hildenbrand wrote:
> On 28.06.22 00:34, Rebecca Mckeever wrote:
> > Add and use functions and macros for printing verbose testing output.
> > 
> > If the Memblock simulator was compiled with VERBOSE=1:
> > - prefix_push(): appends the given string to a prefix string that will be
> >   printed in test_fail() and test_pass*().
> > 
> > - prefix_pop(): removes the last prefix from the prefix string.
> > 
> > - prefix_reset(): clears the prefix string.
> > 
> > - test_fail(): prints a message after a test fails containing the test
> >   number of the failing test and the prefix.
> > 
> > - test_pass(): prints a message after a test passes containing its test
> >   number and the prefix.
> > 
> > - test_print(): prints the given formatted output string.
> > 
> > - test_pass_pop(): runs test_pass() followed by prefix_pop().
> > 
> > - PREFIX_PUSH(): runs prefix_push(__func__).
> > 
> > If the Memblock simulator was not compiled with VERBOSE=1, these
> > functions/macros do nothing.
> > 
> > Add the assert wrapper macros ASSERT_EQ(), ASSERT_NE(), and ASSERT_LT().
> > If the assert condition fails, these macros call test_fail() before
> > executing assert().
> > 
> > Signed-off-by: Rebecca Mckeever <remckee0@...il.com>
> 
> 
> [...]
> 
> >  
> > diff --git a/tools/testing/memblock/tests/common.c b/tools/testing/memblock/tests/common.c
> > index 62d3191f7c9a..e55b2a8bf0ff 100644
> > --- a/tools/testing/memblock/tests/common.c
> > +++ b/tools/testing/memblock/tests/common.c
> > @@ -4,8 +4,12 @@
> >  
> >  #define INIT_MEMBLOCK_REGIONS			128
> >  #define INIT_MEMBLOCK_RESERVED_REGIONS		INIT_MEMBLOCK_REGIONS
> > +#define PREFIXES_LEN_MAX			256
> > +#define DELIM					": "
> > +#define DELIM_LEN				strlen(DELIM)
> 
> Why not simply
> 
> #define PREFIXES_MAX	15
> static const char * __maybe_unused prefixes[PREFIXES_MAX];
> static int nr_prefixes;
> 
> And then simply insert/clear the corresponding prefixes[] pointer and
> update nr_prefixes?
> 
> When printing, you only have to walk prefixes from 0 ... nr_prefixes - 1
> and print the values.
> 
> Avoids any string modifications.
> 
What is nr_prefixes? Number of prefixes? Currently, the longest prefix is
49 characters (alloc_try_nid_bottom_up_reserved_with_space_check), so I
think PREFIXES_MAX would need to be at least 52 (including the delimiter),
but let me know if I'm misunderstanding.
> 
> Anyhow, this LGTM
> 
> Acked-by: David Hildenbrand <david@...hat.com>
> 
> -- 
> Thanks,
> 
> David / dhildenb
> 
Thanks,
Rebecca