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From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Al Viro <viro@zeniv.linux.org.uk>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Will Deacon <will@kernel.org>,
	Dan Williams <dan.j.williams@intel.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Waiman Long <longman@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Andy Lutomirski <luto@kernel.org>, Christoph Hellwig <hch@lst.de>,
	David Laight <David.Laight@aculab.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Borislav Petkov <bp@alien8.de>
Subject: [PATCH v4 4/4] x86/nospec: Remove barrier_nospec()
Date: Tue,  4 May 2021 22:54:32 -0500	[thread overview]
Message-ID: <3ea39399a7f5272c2f89fd7ad1386c7abdf31eb5.1620186182.git.jpoimboe@redhat.com> (raw)
In-Reply-To: <cover.1620186182.git.jpoimboe@redhat.com>

The barrier_nospec() macro is no longer used.  Its uses have been
replaced with address and array index masking.  Remove it.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
 arch/x86/include/asm/barrier.h | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h
index 4819d5e5a335..88f692d4f4ec 100644
--- a/arch/x86/include/asm/barrier.h
+++ b/arch/x86/include/asm/barrier.h
@@ -48,9 +48,6 @@ static inline unsigned long array_index_mask_nospec(unsigned long index,
 /* Override the default implementation from linux/nospec.h. */
 #define array_index_mask_nospec array_index_mask_nospec
 
-/* Prevent speculative execution past this barrier. */
-#define barrier_nospec() alternative("", "lfence", X86_FEATURE_LFENCE_RDTSC)
-
 #define dma_rmb()	barrier()
 #define dma_wmb()	barrier()
 
-- 
2.31.1


      parent reply	other threads:[~2021-05-05  3:55 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-05  3:54 [PATCH v4 0/4] x86/uaccess: Use pointer masking to limit uaccess speculation Josh Poimboeuf
2021-05-05  3:54 ` [PATCH v4 1/4] uaccess: Always inline strn*_user() helper functions Josh Poimboeuf
2021-05-05  3:54 ` [PATCH v4 2/4] uaccess: Fix __user annotations for copy_mc_to_user() Josh Poimboeuf
2021-05-05  3:54 ` [PATCH v4 3/4] x86/uaccess: Use pointer masking to limit uaccess speculation Josh Poimboeuf
2021-05-05  8:48   ` David Laight
2021-05-05 13:19     ` Josh Poimboeuf
2021-05-05 13:51       ` David Laight
2021-05-05 18:32     ` Linus Torvalds
2021-05-06  7:57       ` David Laight
2021-05-05 14:25   ` Mark Rutland
2021-05-05 14:48     ` Josh Poimboeuf
2021-05-05 14:49     ` David Laight
2021-05-05 15:45       ` Mark Rutland
2021-05-05 16:55   ` Andy Lutomirski
2021-05-06  8:36     ` David Laight
2021-05-06 12:05       ` Christoph Hellwig
2021-06-02 17:11   ` Sean Christopherson
2021-06-02 20:11     ` Josh Poimboeuf
2021-05-05  3:54 ` Josh Poimboeuf [this message]

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