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23 October 2021, 00:29:24 UTC
Revision 928501344fc645f80390afc12708c81b3595745d authored by Andrey Konovalov on 26 February 2021, 01:19:55 UTC, committed by Linus Torvalds on 26 February 2021, 17:41:02 UTC 
kasan, mm: don't save alloc stacks twice
 
Patch series "kasan: optimizations and fixes for HW_TAGS", v4.

This patchset makes the HW_TAGS mode more efficient, mostly by reworking
poisoning approaches and simplifying/inlining some internal helpers.

With this change, the overhead of HW_TAGS annotations excluding setting
and checking memory tags is ~3%.  The performance impact caused by tags
will be unknown until we have hardware that supports MTE.

As a side-effect, this patchset speeds up generic KASAN by ~15%.

This patch (of 13):

Currently KASAN saves allocation stacks in both kasan_slab_alloc() and
kasan_kmalloc() annotations.  This patch changes KASAN to save allocation
stacks for slab objects from kmalloc caches in kasan_kmalloc() only, and
stacks for other slab objects in kasan_slab_alloc() only.

This change requires ____kasan_kmalloc() knowing whether the object
belongs to a kmalloc cache.  This is implemented by adding a flag field to
the kasan_info structure.  That flag is only set for kmalloc caches via a
new kasan_cache_create_kmalloc() annotation.

Link: https://lkml.kernel.org/r/cover.1612546384.git.andreyknvl@google.com
Link: https://lkml.kernel.org/r/7c673ebca8d00f40a7ad6f04ab9a2bddeeae2097.1612546384.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent d3a61f7
Raw File
Tip revision: 928501344fc645f80390afc12708c81b3595745d authored by Andrey Konovalov on 26 February 2021, 01:19:55 UTC
kasan, mm: don't save alloc stacks twice
Tip revision: 9285013
acnames.h 
/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
/******************************************************************************
 *
 * Name: acnames.h - Global names and strings
 *
 * Copyright (C) 2000 - 2021, Intel Corp.
 *
 *****************************************************************************/

#ifndef __ACNAMES_H__
#define __ACNAMES_H__

/* Method names - these methods can appear anywhere in the namespace */

#define METHOD_NAME__ADR        "_ADR"
#define METHOD_NAME__AEI        "_AEI"
#define METHOD_NAME__BBN        "_BBN"
#define METHOD_NAME__CBA        "_CBA"
#define METHOD_NAME__CID        "_CID"
#define METHOD_NAME__CLS        "_CLS"
#define METHOD_NAME__CRS        "_CRS"
#define METHOD_NAME__DDN        "_DDN"
#define METHOD_NAME__DMA        "_DMA"
#define METHOD_NAME__HID        "_HID"
#define METHOD_NAME__INI        "_INI"
#define METHOD_NAME__PLD        "_PLD"
#define METHOD_NAME__DSD        "_DSD"
#define METHOD_NAME__PRS        "_PRS"
#define METHOD_NAME__PRT        "_PRT"
#define METHOD_NAME__PRW        "_PRW"
#define METHOD_NAME__PS0        "_PS0"
#define METHOD_NAME__PS1        "_PS1"
#define METHOD_NAME__PS2        "_PS2"
#define METHOD_NAME__PS3        "_PS3"
#define METHOD_NAME__REG        "_REG"
#define METHOD_NAME__SB_        "_SB_"
#define METHOD_NAME__SEG        "_SEG"
#define METHOD_NAME__SRS        "_SRS"
#define METHOD_NAME__STA        "_STA"
#define METHOD_NAME__SUB        "_SUB"
#define METHOD_NAME__UID        "_UID"

/* Method names - these methods must appear at the namespace root */

#define METHOD_PATHNAME__PTS    "\\_PTS"
#define METHOD_PATHNAME__SST    "\\_SI._SST"
#define METHOD_PATHNAME__WAK    "\\_WAK"

/* Definitions of the predefined namespace names  */

#define ACPI_UNKNOWN_NAME       (u32) 0x3F3F3F3F	/* Unknown name is "????" */
#define ACPI_PREFIX_MIXED       (u32) 0x69706341	/* "Acpi" */
#define ACPI_PREFIX_LOWER       (u32) 0x69706361	/* "acpi" */

/* Root name stuff */

#define ACPI_ROOT_NAME          (u32) 0x5F5F5F5C	/* Root name is    "\___" */
#define ACPI_ROOT_PATHNAME      "\\___"
#define ACPI_NAMESPACE_ROOT     "Namespace Root"
#define ACPI_NS_ROOT_PATH       "\\"

#endif				/* __ACNAMES_H__  */
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