We want mmap(NULL) to return PMD-aligned address if the inode can have huge pages in page cache. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> --- mm/huge_memory.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 55aee62e8444..2b1d8d13e2c3 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -528,10 +528,12 @@ unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { loff_t off = (loff_t)pgoff << PAGE_SHIFT; + struct inode *inode = filp->f_mapping->host; if (addr) goto out; - if (!IS_DAX(filp->f_mapping->host) || !IS_ENABLED(CONFIG_FS_DAX_PMD)) + if ((inode->i_flags & S_HUGE_MODE) == S_HUGE_NEVER && + (!IS_DAX(inode) || !IS_ENABLED(CONFIG_FS_DAX_PMD))) goto out; addr = __thp_get_unmapped_area(filp, len, off, flags, PMD_SIZE); -- 2.11.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>