[LTP] [PATCH v2] syscall: Add userfaultfd testcase

[Petr Vorel <pvorel@suse.cz>]

Hi Christian,

some explanation below.

> Hi,

> my main concern is that direct include of linux header.

> Other than that it looks ok, but you could use more SAFE_ macros
> which do the common checks and print error messages for you.

> <snip>

> > +#include "tst_test.h"
> > +#include "lapi/syscalls.h"
> > +#include <linux/userfaultfd.h>

> This doesn't look like it will compile on older kernels.
Please add linux/userfaultfd.h to AC_CHECK_HEADERS in configure.ac
and use #ifdef HAVE_LINUX_USERFAULTFD_H guard and TST_TEST_TCONF with error
message.

...
> > +static void set_pages(void)
> > +{
> > +	page_size = sysconf(_SC_PAGE_SIZE);
> > +	page = mmap(NULL, page_size, PROT_READ | PROT_WRITE,
> > +			MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
> > +	copy_page = mmap(NULL, page_size, PROT_READ | PROT_WRITE,
> > +			MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

> Please use SAFE_MMAP
There are many of SAFE_*() macro helpers, which are supposed to be used
(see include/tst_safe_*.h and doc [1])


Kind regards,
Petr

[1] https://github.com/linux-test-project/ltp/wiki/Test-Writing-Guidelines#22-writing-a-test-in-c