Patch "sparc64: Fix gup_huge_pmd" has been added to the 4.11-stable tree

This is a note to let you know that I've just added the patch titled

sparc64: Fix gup_huge_pmd

to the 4.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
sparc64-fix-gup_huge_pmd.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Nitin Gupta <[email protected]>
Date: Thu, 22 Jun 2017 17:15:08 -0700
Subject: sparc64: Fix gup_huge_pmd

From: Nitin Gupta <[email protected]>

[ Upstream commit dbd2667a4fb9ce4f547982b07cd69dda127c47ea ]

The function assumes that each PMD points to head of a huge page. This is not correct as a PMD can point to start of any 8M region with a, say 256M, hugepage. The fix ensures that it points to the correct head of any PMD huge page.

---
 arch/sparc/mm/gup.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -78,8 +78,8 @@ static int gup_huge_pmd(pmd_t *pmdp, pmd
 		return 0;
 
 	refs = 0;
-	head = pmd_page(pmd);
-	page = head + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
+	page = pmd_page(pmd) + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
+	head = compound_head(page);
 	do {
 		VM_BUG_ON(compound_head(page) != head);
 		pages[*nr] = page;

Patches currently in stable-queue which might be from [email protected] are

queue-4.11/sparc64-fix-gup_huge_pmd.patch