From: Greg KH <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
torvalds@linux-foundation.org, stable@vger.kernel.org
Cc: lwn@lwn.net, Jiri Slaby <jslaby@suse.cz>
Subject: Re: Linux 4.17.17
Date: Sat, 18 Aug 2018 11:26:15 +0200 [thread overview]
Message-ID: <20180818092615.GB5482@kroah.com> (raw)
In-Reply-To: <20180818092611.GA5482@kroah.com>
diff --git a/Makefile b/Makefile
index 8ca595f045c4..5ff2040cf3ee 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
VERSION = 4
PATCHLEVEL = 17
-SUBLEVEL = 16
+SUBLEVEL = 17
EXTRAVERSION =
NAME = Merciless Moray
diff --git a/arch/x86/include/asm/pgtable-invert.h b/arch/x86/include/asm/pgtable-invert.h
index 44b1203ece12..a0c1525f1b6f 100644
--- a/arch/x86/include/asm/pgtable-invert.h
+++ b/arch/x86/include/asm/pgtable-invert.h
@@ -4,9 +4,18 @@
#ifndef __ASSEMBLY__
+/*
+ * A clear pte value is special, and doesn't get inverted.
+ *
+ * Note that even users that only pass a pgprot_t (rather
+ * than a full pte) won't trigger the special zero case,
+ * because even PAGE_NONE has _PAGE_PROTNONE | _PAGE_ACCESSED
+ * set. So the all zero case really is limited to just the
+ * cleared page table entry case.
+ */
static inline bool __pte_needs_invert(u64 val)
{
- return !(val & _PAGE_PRESENT);
+ return val && !(val & _PAGE_PRESENT);
}
/* Get a mask to xor with the page table entry to get the correct pfn. */
prev parent reply other threads:[~2018-08-18 9:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-18 9:26 Linux 4.17.17 Greg KH
2018-08-18 9:26 ` Greg KH [this message]
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