[LTP] [PATCH v2] syscalls/mallinfo2_01: Add a basic test for mallinfo2 when setting 2G size

[xuyang2018.jy@fujitsu.com <xuyang2018.jy@fujitsu.com>]

Hi Petr
> Hi Xu,
>
> ...
>> +++ b/testcases/kernel/syscalls/mallinfo/mallinfo_common.h
>> @@ -1,5 +1,6 @@
>>   // SPDX-License-Identifier: GPL-2.0-or-later
>>   /*
>> + * Copyright (C) 2020 Free Software Foundation, Inc.
>>    * Copyright (c) 2021 FUJITSU LIMITED. All rights reserved.
>>    * Author: Yang Xu<xuyang2018.jy@cn.fujitsu.com>
>>    */
>> @@ -28,4 +29,22 @@ static inline void print_mallinfo(const char *msg, struct mallinfo *m)
>>   }
>>   #endif
>
>> +#ifdef HAVE_MALLINFO2
>> +static inline void print_mallinfo2(const char *msg, struct mallinfo2 *m)
>> +{
>> +	tst_res(TINFO, "%s...", msg);
> nit: I'd remove "..." and add extra space before #define (readability)
> And also change it on previously added print_mallinfo().
>
>> +#define P2(f) tst_res(TINFO, "%s: %ld", #f, m->f)
>> +	P2(arena);
>> +	P2(ordblks);
>> +	P2(smblks);
>> +	P2(hblks);
>> +	P2(hblkhd);
>> +	P2(usmblks);
>> +	P2(fsmblks);
>> +	P2(uordblks);
>> +	P2(fordblks);
>> +	P2(keepcost);
>> +}
>> +#endif
>
> ...
>> +++ b/testcases/kernel/syscalls/mallinfo2/mallinfo2_01.c
>> @@ -0,0 +1,46 @@
>> +// SPDX-License-Identifier: GPL-2.0-or-later
>> +/*
>> + * Copyright (c) 2021 FUJITSU LIMITED. All rights reserved.
>> + * Author: Yang Xu<xuyang2018.jy@fujitsu.com>
>> + */
>> +
>> +/*\
>> + * [DESCRIPTION]
>> + *
>> + * Basic mallinfo2() test.
>> + *
>> + * Test members of struct mallinfo2() whether overflow when setting 2G size.
> * Test hblkhd member of struct mallinfo2 whether overflow when setting 2G size.
>
>> + */
>> +
>> +#include "mallinfo_common.h"
>> +#include "tst_safe_macros.h"
>> +
>> +#ifdef HAVE_MALLINFO2
>> +
>> +void test_mallinfo2(void)
>> +{
>> +	struct mallinfo2 info;
>> +	char *buf;
>> +	size_t size = 2UL * 1024UL * 1024UL * 1024UL;
>> +
>> +	buf = malloc(size);
>> +	if (!buf) {
>> +		tst_res(TCONF, "Current system can not malloc 2G space, skip it");
>> +		return;
>> +	}
> Here could be just:
> 	if (!buf)
> 		tst_brk(TCONF, "Current system can not malloc 2G space, skip it");
>
>> +	info = mallinfo2();
>> +	if (info.hblkhd<  size) {
>> +		print_mallinfo2("Test malloc 2G",&info);
>> +		tst_brk(TFAIL, "The member of struct mallinfo2 overflow?");
> You don't free buf here.
>
> Maybe something like:
>
> 	if (info.hblkhd<  size) {
> 		print_mallinfo2("Test malloc 2G",&info);
> 		tst_res(TFAIL, "hblkhd member of struct mallinfo2 overflow?");
> 	} else {
> 		tst_res(TPASS, "hblkhd member of struct mallinfo2 doesn't overflow");
> 	}
>
> 	free(buf);
>
> If you're ok with it, no need to repost, I'll change it before merge.
I am ok with these changes. Thanks for your review.

Best Regards
Yang Xu
>
> Kind regards,
> Petr