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* [PATCH v5 00/18] Rework READ_ONCE() to improve codegen
@ 2020-05-11 20:41 Will Deacon
  2020-05-11 20:41 ` [PATCH v5 01/18] sparc32: mm: Fix argument checking in __srmmu_get_nocache() Will Deacon
                   ` (18 more replies)
  0 siblings, 19 replies; 127+ messages in thread
From: Will Deacon @ 2020-05-11 20:41 UTC (permalink / raw)
  To: linux-kernel; +Cc: elver, tglx, paulmck, mingo, peterz, will

Hi folks,

(trimmed CC list since v4 since this is largely just a rebase)

This is version five of the READ_ONCE() codegen improvement series that
I've previously posted here:

RFC: https://lore.kernel.org/lkml/20200110165636.28035-1-will@kernel.org
v2:  https://lore.kernel.org/lkml/20200123153341.19947-1-will@kernel.org
v3:  https://lore.kernel.org/lkml/20200415165218.20251-1-will@kernel.org
v4:  https://lore.kernel.org/lkml/20200421151537.19241-1-will@kernel.org

The main change since v4 is that this is now based on top of the KCSAN
changes queued in -tip (locking/kcsan) and therefore contains the patches
necessary to avoid breaking sparc32 as well as some cleanups to
consolidate {READ,WRITE}_ONCE() and data_race().

Other changes include:

  * Treat 'char' as distinct from 'signed char' and 'unsigned char' for
    __builtin_types_compatible_p()

  * Add a compile-time assertion that the argument to READ_ONCE_NOCHECK()
    points at something the same size as 'unsigned long'

I'm happy for all of this to go via -tip, or I can take it via arm64.

Please let me know.

Cheers,

Will

Cc: Marco Elver <elver@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de> 
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>

--->8

Will Deacon (18):
  sparc32: mm: Fix argument checking in __srmmu_get_nocache()
  sparc32: mm: Restructure sparc32 MMU page-table layout
  sparc32: mm: Change pgtable_t type to pte_t * instead of struct page *
  sparc32: mm: Reduce allocation size for PMD and PTE tables
  compiler/gcc: Raise minimum GCC version for kernel builds to 4.8
  netfilter: Avoid assigning 'const' pointer to non-const pointer
  net: tls: Avoid assigning 'const' pointer to non-const pointer
  fault_inject: Don't rely on "return value" from WRITE_ONCE()
  arm64: csum: Disable KASAN for do_csum()
  READ_ONCE: Simplify implementations of {READ,WRITE}_ONCE()
  READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses
  READ_ONCE: Drop pointer qualifiers when reading from scalar types
  locking/barriers: Use '__unqual_scalar_typeof' for load-acquire macros
  arm64: barrier: Use '__unqual_scalar_typeof' for acquire/release
    macros
  gcov: Remove old GCC 3.4 support
  kcsan: Rework data_race() so that it can be used by READ_ONCE()
  READ_ONCE: Use data_race() to avoid KCSAN instrumentation
  linux/compiler.h: Remove redundant '#else'

 Documentation/process/changes.rst   |   2 +-
 arch/arm/crypto/Kconfig             |  12 +-
 arch/arm64/include/asm/barrier.h    |  16 +-
 arch/arm64/lib/csum.c               |  20 +-
 arch/sparc/include/asm/page_32.h    |  12 +-
 arch/sparc/include/asm/pgalloc_32.h |  11 +-
 arch/sparc/include/asm/pgtable_32.h |  40 +-
 arch/sparc/include/asm/pgtsrmmu.h   |  36 +-
 arch/sparc/include/asm/viking.h     |   5 +-
 arch/sparc/kernel/head_32.S         |   8 +-
 arch/sparc/mm/hypersparc.S          |   3 +-
 arch/sparc/mm/srmmu.c               |  95 ++---
 arch/sparc/mm/viking.S              |   5 +-
 crypto/Kconfig                      |   1 -
 drivers/xen/time.c                  |   2 +-
 include/asm-generic/barrier.h       |  16 +-
 include/linux/compiler-gcc.h        |   5 +-
 include/linux/compiler.h            | 207 +++++-----
 include/linux/compiler_types.h      |  26 ++
 init/Kconfig                        |   1 -
 kernel/gcov/Kconfig                 |  24 --
 kernel/gcov/Makefile                |   3 +-
 kernel/gcov/gcc_3_4.c               | 573 ----------------------------
 lib/fault-inject.c                  |   4 +-
 net/netfilter/core.c                |   2 +-
 net/tls/tls_main.c                  |   2 +-
 scripts/gcc-plugins/Kconfig         |   2 +-
 27 files changed, 257 insertions(+), 876 deletions(-)
 delete mode 100644 kernel/gcov/gcc_3_4.c

-- 
2.26.2.645.ge9eca65c58-goog


^ permalink raw reply	[flat|nested] 127+ messages in thread

end of thread, other threads:[~2020-06-09 13:45 UTC | newest]

Thread overview: 127+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-05-11 20:41 [PATCH v5 00/18] Rework READ_ONCE() to improve codegen Will Deacon
2020-05-11 20:41 ` [PATCH v5 01/18] sparc32: mm: Fix argument checking in __srmmu_get_nocache() Will Deacon
2020-05-12 14:37   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 02/18] sparc32: mm: Restructure sparc32 MMU page-table layout Will Deacon
2020-05-12 14:37   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 03/18] sparc32: mm: Change pgtable_t type to pte_t * instead of struct page * Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 04/18] sparc32: mm: Reduce allocation size for PMD and PTE tables Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-17  0:00   ` [PATCH v5 04/18] " Guenter Roeck
2020-05-17  0:07     ` Guenter Roeck
2020-05-18  8:37       ` Will Deacon
2020-05-18  9:18         ` Mike Rapoport
2020-05-18  9:48         ` Guenter Roeck
2020-05-18 14:23           ` Mike Rapoport
2020-05-18 16:08             ` Guenter Roeck
2020-05-18 18:11               ` Ira Weiny
2020-05-18 18:14               ` Ira Weiny
2020-05-18 18:09             ` Guenter Roeck
2020-05-18 18:21               ` Ira Weiny
2020-05-18 19:15               ` Mike Rapoport
2020-05-19 16:40                 ` Guenter Roeck
2020-05-20 17:03         ` Mike Rapoport
2020-05-20 19:03           ` Guenter Roeck
2020-05-20 19:51             ` Mike Rapoport
2020-05-21 23:02               ` Guenter Roeck
2020-05-24 12:32                 ` Mike Rapoport
2020-05-24 14:01                   ` Guenter Roeck
2020-05-26 13:26                   ` Will Deacon
2020-05-26 14:01                     ` Will Deacon
2020-05-26 15:21                       ` Mike Rapoport
2020-05-26 16:18                       ` Guenter Roeck
2020-05-26 16:29                         ` Mike Rapoport
2020-05-26 17:15                           ` Guenter Roeck
2020-05-11 20:41 ` [PATCH v5 05/18] compiler/gcc: Raise minimum GCC version for kernel builds to 4.8 Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 06/18] netfilter: Avoid assigning 'const' pointer to non-const pointer Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 07/18] net: tls: " Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 08/18] fault_inject: Don't rely on "return value" from WRITE_ONCE() Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 09/18] arm64: csum: Disable KASAN for do_csum() Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 10/18] READ_ONCE: Simplify implementations of {READ,WRITE}_ONCE() Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 11/18] READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 12/18] READ_ONCE: Drop pointer qualifiers when reading from scalar types Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 13/18] locking/barriers: Use '__unqual_scalar_typeof' for load-acquire macros Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 14/18] arm64: barrier: Use '__unqual_scalar_typeof' for acquire/release macros Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 15/18] gcov: Remove old GCC 3.4 support Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 16/18] kcsan: Rework data_race() so that it can be used by READ_ONCE() Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 17/18] READ_ONCE: Use data_race() to avoid KCSAN instrumentation Will Deacon
2020-05-12  8:23   ` Peter Zijlstra
2020-05-12  9:49     ` Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-20 22:17     ` Borislav Petkov
2020-05-20 22:30       ` Marco Elver
2020-05-21  7:25         ` Borislav Petkov
2020-05-21  9:37           ` Marco Elver
2020-05-21  3:30       ` Nathan Chancellor
2020-05-22 16:08       ` [tip: locking/kcsan] compiler.h: Avoid nested statement expression in data_race() tip-bot2 for Marco Elver
2020-05-11 20:41 ` [PATCH v5 18/18] linux/compiler.h: Remove redundant '#else' Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-12  8:18 ` [PATCH v5 00/18] Rework READ_ONCE() to improve codegen Peter Zijlstra
2020-05-12 17:53   ` Marco Elver
2020-05-12 18:55     ` Marco Elver
2020-05-12 19:07     ` Peter Zijlstra
2020-05-12 20:31       ` Marco Elver
2020-05-13 11:10         ` Peter Zijlstra
2020-05-13 11:14           ` Peter Zijlstra
2020-05-13 11:48           ` Marco Elver
2020-05-13 12:32             ` Peter Zijlstra
2020-05-13 12:40               ` Will Deacon
2020-05-13 13:15                 ` Marco Elver
2020-05-13 13:24                   ` Peter Zijlstra
2020-05-13 13:58                     ` Marco Elver
2020-05-14 11:21                       ` Peter Zijlstra
2020-05-14 11:24                         ` Peter Zijlstra
2020-05-14 11:35                         ` Peter Zijlstra
2020-05-14 12:01                         ` Will Deacon
2020-05-14 12:27                           ` Peter Zijlstra
2020-05-14 13:07                             ` Marco Elver
2020-05-14 13:14                               ` Peter Zijlstra
2020-05-14 12:20                         ` Peter Zijlstra
2020-05-14 14:13                       ` Peter Zijlstra
2020-05-14 14:20                         ` Marco Elver
2020-05-15  9:20                           ` Peter Zijlstra
2020-05-13 16:50                   ` Will Deacon
2020-05-13 17:32                     ` Marco Elver
2020-05-13 17:47                       ` Will Deacon
2020-05-13 18:54                         ` Marco Elver
2020-05-13 21:25                           ` Will Deacon
2020-05-14  7:31                             ` Marco Elver
2020-05-14 11:05                               ` Will Deacon
2020-05-14 13:35                                 ` Marco Elver
2020-05-14 13:47                                   ` Peter Zijlstra
2020-05-14 13:50                                   ` Peter Zijlstra
2020-05-14 13:56                                   ` Peter Zijlstra
2020-05-14 14:24                                   ` Peter Zijlstra
2020-05-14 15:09                                     ` Thomas Gleixner
2020-05-14 15:29                                       ` Marco Elver
2020-05-14 19:37                                         ` Thomas Gleixner
2020-05-15 13:55                                     ` David Laight
2020-05-15 14:04                                       ` Marco Elver
2020-05-15 14:07                                       ` Peter Zijlstra
2020-05-14 15:38                                   ` Paul E. McKenney
2020-05-22 16:08                                   ` [tip: locking/kcsan] kcsan: Restrict supported compilers tip-bot2 for Marco Elver
2020-06-03 18:52                                 ` [PATCH v5 00/18] Rework READ_ONCE() to improve codegen Borislav Petkov
2020-06-03 19:23                                   ` Marco Elver
2020-06-03 22:05                                     ` Borislav Petkov
2020-06-08 17:32                                     ` Martin Liška
2020-06-08 19:56                                       ` Marco Elver
2020-06-09 11:55                                         ` Martin Liška
2020-06-09 12:36                                           ` Martin Liška
2020-06-09 13:45                                             ` Marco Elver
2020-05-22 16:08                           ` [tip: locking/kcsan] kcsan: Remove 'noinline' from __no_kcsan_or_inline tip-bot2 for Marco Elver
2020-05-13 13:21                 ` [PATCH v5 00/18] Rework READ_ONCE() to improve codegen David Laight
2020-05-13 16:32                   ` Thomas Gleixner
2020-05-12 21:14       ` Will Deacon
2020-05-12 22:00         ` Marco Elver

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