From: Will Deacon <will.deacon@arm.com>
To: paulmck@linux.vnet.ibm.com
Cc: linux-kernel@vger.kernel.org, mcree@orcon.net.nz,
peterz@infradead.org, rth@twiddle.net, ink@jurassic.park.msu.ru,
mattst88@gmail.com, linux-alpha@vger.kernel.org,
Will Deacon <will.deacon@arm.com>
Subject: [PATCH 0/3] Remove lockless_dereference
Date: Thu, 12 Oct 2017 15:26:14 +0100 [thread overview]
Message-ID: <1507818377-7546-1-git-send-email-will.deacon@arm.com> (raw)
Hi all,
These patches remove lockless_dereference from the kernel. It's only used
in a handful of places relative to READ_ONCE and ACCESS_ONCE and is only
required for correctness on Alpha. Consequently, READ_ONCE is strengthened
on Alpha systems to include the smp_read_barrier_depends implicitly and
Alpha's release and release atomic_t and atomic64_t operations are also
upgraded.
The nastiest part about all of this was actually fixing the circular
includes of compiler.h, which is an existing problem that doesn't crop
up in practice because lockless_dereference is rarely used.
Thanks,
Will
--->8
Will Deacon (3):
linux/compiler.h: Split into compiler.h and compiler-types.h
locking/barriers: Kill lockless_dereference
alpha: atomics: Add smp_read_barrier_depends() to release/relaxed
atomics
Documentation/memory-barriers.txt | 12 -
.../translations/ko_KR/memory-barriers.txt | 12 -
arch/alpha/include/asm/atomic.h | 13 +
arch/arm/include/asm/ptrace.h | 3 +-
arch/x86/events/core.c | 2 +-
arch/x86/include/asm/mmu_context.h | 4 +-
arch/x86/kernel/ldt.c | 2 +-
drivers/md/dm-mpath.c | 20 +-
fs/dcache.c | 4 +-
fs/overlayfs/ovl_entry.h | 2 +-
fs/overlayfs/readdir.c | 2 +-
include/linux/compiler-clang.h | 2 +-
include/linux/compiler-gcc.h | 2 +-
include/linux/compiler-intel.h | 2 +-
include/linux/compiler-types.h | 274 ++++++++++++++++++++
include/linux/compiler.h | 286 +--------------------
include/linux/linkage.h | 2 +-
include/linux/rculist.h | 4 +-
include/linux/rcupdate.h | 4 +-
include/uapi/linux/stddef.h | 2 +-
kernel/events/core.c | 4 +-
kernel/seccomp.c | 2 +-
kernel/task_work.c | 2 +-
mm/slab.h | 2 +-
scripts/headers_install.sh | 2 +-
25 files changed, 325 insertions(+), 341 deletions(-)
create mode 100644 include/linux/compiler-types.h
--
2.1.4
next reply other threads:[~2017-10-12 14:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-12 14:26 Will Deacon [this message]
2017-10-12 14:26 ` [PATCH 1/3] linux/compiler.h: Split into compiler.h and compiler-types.h Will Deacon
2017-10-12 14:26 ` [PATCH 2/3] locking/barriers: Kill lockless_dereference Will Deacon
2017-10-12 15:16 ` Paul E. McKenney
2017-10-12 14:26 ` [PATCH 3/3] alpha: atomics: Add smp_read_barrier_depends() to release/relaxed atomics Will Deacon
2017-10-12 15:17 ` Paul E. McKenney
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