linux-kernel - [PATCH 3/3] nospec: Include asm/barrier.h dependency

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Date:   Fri, 16 Feb 2018 13:20:54 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     mingo@...nel.org
Cc:     linux-arch@...r.kernel.org, Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 3/3] 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.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Will Deacon <will.deacon@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Reported-by: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 include/linux/nospec.h |    1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/nospec.h b/include/linux/nospec.h
index 172a19dc35ab..e791ebc65c9c 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