[PATCHv6 16/37] thp: make thp_get_unmapped_area() respect S_HUGE_MODE
From: Kirill A. Shutemov <hidden>
Date: 2017-01-26 11:57:58
Also in:
linux-block, linux-fsdevel, linux-mm, lkml
Subsystem:
memory management, memory management - thp (transparent huge page), the rest · Maintainers:
Andrew Morton, David Hildenbrand, Lorenzo Stoakes, Linus Torvalds
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 <redacted> --- 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
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