[tip:x86/pti] x86/mm/pti: Fix 32 bit PCID check

[tip-bot for Joerg Roedel <tipbot@zytor.com>]

Commit-ID:  88c6f8a3977cc35997b47e2f99f080a15559c1eb
Gitweb:     https://git.kernel.org/tip/88c6f8a3977cc35997b47e2f99f080a15559c1eb
Author:     Joerg Roedel <jroedel@suse.de>
AuthorDate: Tue, 7 Aug 2018 12:24:29 +0200
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Tue, 7 Aug 2018 18:51:22 +0200

x86/mm/pti: Fix 32 bit PCID check

The check uses the wrong operator and causes false positive
warnings in the kernel log on some systems.

Fixes: 5e8105950a8b3 ('x86/mm/pti: Add Warning when booting on a PCID capable CPU')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: linux-mm@kvack.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Eduardo Valentin <eduval@amazon.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: aliguori@amazon.com
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Waiman Long <llong@redhat.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "David H . Gutteridge" <dhgutteridge@sympatico.ca>
Cc: joro@8bytes.org
Link: https://lkml.kernel.org/r/1533637471-30953-2-git-send-email-joro@8bytes.org

---
 arch/x86/mm/pti.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index ef8db6ffc836..113ba14a03d8 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -549,7 +549,7 @@ void __init pti_init(void)
 	 * supported on 32 bit anyway. To print the warning we need to
 	 * check with cpuid directly again.
 	 */
-	if (cpuid_ecx(0x1) && BIT(17)) {
+	if (cpuid_ecx(0x1) & BIT(17)) {
 		/* Use printk to work around pr_fmt() */
 		printk(KERN_WARNING "\n");
 		printk(KERN_WARNING "************************************************************\n");