On 8/28/26 4:11 PM, Yeoreum Yun wrote:
Since glibc commit 321e1fc73f (“malloc: Enable 2MB THP by default on AArch64”), glibc may call madvise(MADV_HUGEPAGE) for sufficiently large allocations made by memalign(). The underlying VMA may start at a different address from the aligned address returned by memalign(). Furthermore, a subsequent madvise(MADV_HUGEPAGE) call does not split the VMA because the flag is already set. This causes split_huge_page_test to fail because the check_huge_xxx() helpers incorrectly require the address returned by memalign() to match the VMA start address reported in /proc/self/smaps. Fix this by using /proc/self/pagemap and /proc/kpageflags instead of /proc/self/smaps to detect huge pages. Reported-by: David Hildenbrand (Arm) <[email protected]> Suggested-by: Zi Yan <[email protected]> Signed-off-by: Yeoreum Yun <[email protected]> ---
LGTM, with comments from Lorenzo and Zi addressed. Reviewed-by: Baolin Wang <[email protected]> Tested-by: Baolin Wang <[email protected]>
