make run_tests -C proc: proc-pid-vm assertion failed.

[Jie2x Zhou]

hi,

The test error is caused by g_vsyscall set failed.

Error output:
 selftests: proc: proc-pid-vm
 proc-pid-vm: proc-pid-vm.c:389: main: Assertion `rv == len' failed.
 Aborted

g_vsyscall is set to 0.
In proc-pid-vm.c:
/*
 * 0: vsyscall VMA doesn't exist        vsyscall=none
 * 1: vsyscall VMA is r-xp              vsyscall=emulate
 * 2: vsyscall VMA is --xp              vsyscall=xonly
 */
static int g_vsyscall;
static const char *str_vsyscall;

static const char str_vsyscall_0[] = "";
static const char str_vsyscall_1[] =
"ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]\n";
static const char str_vsyscall_2[] =
"ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0                  [vsyscall]\n";

The /proc/%u/maps output is:
buf=100000000-100001000 r-xp 00000000 00:2d 2                                /tmp/#2 (deleted)
ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0                  [vsyscall]

So the g_vsyscall should be 2 according to commentary(2: vsyscall VMA is --xp).
Is it a bug?

best regards,