Patch "sparc64: Fix page table walk for PUD hugepages" has been added to the 4.14-stable tree

Patch "sparc64: Fix page table walk for PUD hugepages" has been added to the 4.14-stable tree

[gregkh]

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

    sparc64: Fix page table walk for PUD hugepages

to the 4.14-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:
     0001-sparc64-Fix-page-table-walk-for-PUD-hugepages.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From fac33aa62841b69cd0e19a29b0e2ac96e4e8cf32 Mon Sep 17 00:00:00 2001
From: Nitin Gupta <nitin.m.gupta@oracle.com>
Date: Fri, 3 Nov 2017 12:26:06 -0700
Subject: sparc64: Fix page table walk for PUD hugepages

From: Nitin Gupta <nitin.m.gupta@oracle.com>

[ Upstream commit 70f3c8b7c2e7ebcdde8354da004872e7c9184e97 ]

For a PUD hugepage entry, we need to propagate bits [32:22]
from virtual address to resolve at 4M granularity. However,
the current code was incorrectly propagating bits [29:19].
This bug can cause incorrect data to be returned for pages
backed with 16G hugepages.

Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/sparc/include/asm/tsb.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/sparc/include/asm/tsb.h b/arch/sparc/include/asm/tsb.h
index 25b6abdb3908..522a677e050d 100644
--- a/arch/sparc/include/asm/tsb.h
+++ b/arch/sparc/include/asm/tsb.h
@@ -217,7 +217,7 @@ extern struct tsb_phys_patch_entry __tsb_phys_patch, __tsb_phys_patch_end;
 	sllx		REG2, 32, REG2;			\
 	andcc		REG1, REG2, %g0;		\
 	be,pt		%xcc, 700f;			\
-	 sethi		%hi(0x1ffc0000), REG2;		\
+	 sethi		%hi(0xffe00000), REG2;		\
 	sllx		REG2, 1, REG2;			\
 	brgez,pn	REG1, FAIL_LABEL;		\
 	 andn		REG1, REG2, REG1;		\
-- 
2.13.6



Patches currently in stable-queue which might be from nitin.m.gupta@oracle.com are

queue-4.14/0001-sparc64-Fix-page-table-walk-for-PUD-hugepages.patch