[Bug dynamic-link/34348] New: FAIL: elf/tst-thp-1 if THP is disabled in kernel

https://sourceware.org/bugzilla/show_bug.cgi?id=34348

            Bug ID: 34348
           Summary: FAIL: elf/tst-thp-1 if THP is disabled in kernel
           Product: glibc
           Version: 2.44
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---
            Target: x86_64

_dl_get_thp_config has

  if (DL_MAP_DEFAULT_THP_PAGESIZE != 0)
    {
      GL(dl_elf_thp_pagesize) = DL_MAP_DEFAULT_THP_PAGESIZE;
      GL(dl_thp_mode) = thp_mode_madvise;
    }
  else
    {
      GL(dl_thp_mode) = __get_thp_mode ();
      if (GL(dl_thp_mode) == thp_mode_always
          || GL(dl_thp_mode) == thp_mode_madvise)
        GL(dl_elf_thp_pagesize) = get_capped_thp_size ();
      else
        GL(dl_elf_thp_pagesize) = 0;

      if (GL(dl_elf_thp_pagesize) == 0)
        {
          GL(dl_elf_thp_control) = dl_elf_thp_control_disabled;
          GL(dl_thp_mode) = thp_mode_not_supported;
        }
    }

sysdeps/unix/sysv/linux/x86_64/hugepages.h has

#define DL_MAP_DEFAULT_THP_PAGESIZE (2 * 1024 * 1024)

If THP is disabled in x86-64 kernel, we will get

.../elf/tst-thp-1.test-result
.../elf/tst-thp-1: error while loading shared libraries:
.../elf/tst-thp-1: failed to map segment from shared object
make[2]: Leaving directory '.../elf'
FAIL: elf/tst-thp-1

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