change_huge_pmd() has assert which is not relvant for file page. For shared mapping it's perfectly fine to have page table entry writable, without explicit mkwrite.
Signed-off-by: Kirill A. Shutemov <[email protected]> --- mm/huge_memory.c | 1 - 1 file changed, 1 deletion(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 00f10d323039..8e2d84698c15 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1756,7 +1756,6 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, entry = pmd_mkwrite(entry); ret = HPAGE_PMD_NR; set_pmd_at(mm, addr, pmd, entry); - BUG_ON(!preserve_write && pmd_write(entry)); } spin_unlock(ptl); } -- 2.7.0
