Commit 49502766 authored Nov 15, 2017 by Levin, Alexander (Sasha Levin) Committed by Linus Torvalds Nov 15, 2017

kmemcheck: remove annotations

Patch series "kmemcheck: kill kmemcheck", v2.

As discussed at LSF/MM, kill kmemcheck.

KASan is a replacement that is able to work without the limitation of
kmemcheck (single CPU, slow).  KASan is already upstream.

We are also not aware of any users of kmemcheck (or users who don't
consider KASan as a suitable replacement).

The only objection was that since KASAN wasn't supported by all GCC
versions provided by distros at that time we should hold off for 2
years, and try again.

Now that 2 years have passed, and all distros provide gcc that supports
KASAN, kill kmemcheck again for the very same reasons.

This patch (of 4):

Remove kmemcheck annotations, and calls to kmemcheck from the kernel.

[alexander.levin@verizon.com: correctly remove kmemcheck call from dma_map_sg_attrs]
  Link: http://lkml.kernel.org/r/20171012192151.26531-1-alexander.levin@verizon.com
Link: http://lkml.kernel.org/r/20171007030159.22241-2-alexander.levin@verizon.com


Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tim Hansen <devtimhansen@gmail.com>
Cc: Vegard Nossum <vegardno@ifi.uio.no>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent cdb07bde

arch/arm/include/asm/dma-iommu.h

+0 −1

Original line number	Diff line number	Diff line
		@@ -7,7 +7,6 @@
		#include <linux/mm_types.h>
		#include <linux/scatterlist.h>
		#include <linux/dma-debug.h>
		#include <linux/kmemcheck.h>
		#include <linux/kref.h>

		#define ARM_MAPPING_ERROR (~(dma_addr_t)0x0)

arch/openrisc/include/asm/dma-mapping.h

+0 −1

Original line number	Diff line number	Diff line
		@@ -23,7 +23,6 @@
		*/

		#include <linux/dma-debug.h>
		#include <linux/kmemcheck.h>
		#include <linux/dma-mapping.h>

		extern const struct dma_map_ops or1k_dma_map_ops;

arch/x86/Makefile

+0 −5

Original line number	Diff line number	Diff line
		@@ -158,11 +158,6 @@ ifdef CONFIG_X86_X32
		endif
		export CONFIG_X86_X32_ABI

		# Don't unroll struct assignments with kmemcheck enabled
		ifeq ($(CONFIG_KMEMCHECK),y)
		KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
		endif

		#
		# If the function graph tracer is used with mcount instead of fentry,
		# '-maccumulate-outgoing-args' is needed to prevent a GCC bug

arch/x86/include/asm/dma-mapping.h

+0 −1

Original line number	Diff line number	Diff line
		@@ -7,7 +7,6 @@
		* Documentation/DMA-API.txt for documentation.
		*/

		#include <linux/kmemcheck.h>
		#include <linux/scatterlist.h>
		#include <linux/dma-debug.h>
		#include <asm/io.h>

arch/x86/include/asm/xor.h

+1 −4

Original line number	Diff line number	Diff line
		#ifdef CONFIG_KMEMCHECK
		/* kmemcheck doesn't handle MMX/SSE/SSE2 instructions */
		# include <asm-generic/xor.h>
		#elif !defined(_ASM_X86_XOR_H)
		#ifndef _ASM_X86_XOR_H
		#define _ASM_X86_XOR_H

		/*