linux-kernel - [tip:x86/pti] nospec: Include <asm/barrier.h> dependency

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Message-ID: <tip-eb6174f6d1be16b19cfa43dac296bfed003ce1a6@git.kernel.org>
Date:   Sat, 17 Feb 2018 02:11:34 -0800
From:   tip-bot for Dan Williams <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, borntraeger@...ibm.com, jpoimboe@...hat.com,
        hpa@...or.com, bp@...en8.de, linux-kernel@...r.kernel.org,
        arjan@...ux.intel.com, peterz@...radead.org,
        torvalds@...ux-foundation.org, gregkh@...uxfoundation.org,
        luto@...nel.org, dwmw2@...radead.org, dan.j.williams@...el.com,
        tglx@...utronix.de, will.deacon@....com,
        dave.hansen@...ux.intel.com
Subject: [tip:x86/pti] nospec: Include <asm/barrier.h> dependency

Commit-ID:  eb6174f6d1be16b19cfa43dac296bfed003ce1a6
Gitweb:     https://git.kernel.org/tip/eb6174f6d1be16b19cfa43dac296bfed003ce1a6
Author:     Dan Williams <dan.j.williams@...el.com>
AuthorDate: Fri, 16 Feb 2018 13:20:54 -0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sat, 17 Feb 2018 08:40:59 +0100

nospec: Include <asm/barrier.h> dependency

The nospec.h header expects the per-architecture header file
<asm/barrier.h> to optionally define array_index_mask_nospec(). Include
that dependency to prevent inadvertent fallback to the default
array_index_mask_nospec() implementation.

The default implementation may not provide a full mitigation
on architectures that perform data value speculation.

Reported-by: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Deacon <will.deacon@....com>
Cc: linux-arch@...r.kernel.org
Link: http://lkml.kernel.org/r/151881605404.17395.1341935530792574707.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/nospec.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/nospec.h b/include/linux/nospec.h
index 172a19d..e791ebc 100644
--- a/include/linux/nospec.h
+++ b/include/linux/nospec.h
@@ -5,6 +5,7 @@
 
 #ifndef _LINUX_NOSPEC_H
 #define _LINUX_NOSPEC_H
+#include <asm/barrier.h>
 
 /**
  * array_index_mask_nospec() - generate a ~0 mask when index < size, 0 otherwise