From: Andrzej Hajda <andrzej.hajda@intel.com>
To: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-snps-arc@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org,
loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org,
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linux-xtensa@linux-xtensa.org, intel-gfx@lists.freedesktop.org,
dri-devel@lists.freedesktop.org
Cc: Andrzej Hajda <andrzej.hajda@intel.com>,
Arnd Bergmann <arnd@arndb.de>,
Rodrigo Vivi <rodrigo.vivi@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Boqun Feng <boqun.feng@gmail.com>,
Mark Rutland <mark.rutland@arm.com>
Subject: [PATCH v5 0/7] Introduce __xchg, non-atomic xchg
Date: Wed, 18 Jan 2023 16:35:22 +0100 [thread overview]
Message-ID: <20230118153529.57695-1-andrzej.hajda@intel.com> (raw)
Hi all,
The helper is tiny and there are advices we can live without it, so
I want to present few arguments why it would be good to have it:
1. Code readability/simplification/number of lines:
- decreases number of lines,
- it often eliminates local variables,
- for real examples see patches 3+.
2. Presence of similar helpers in other somehow related languages/libs:
a) Rust[1]: 'replace' from std::mem module, there is also 'take'
helper (__xchg(&x, 0)), which is the same as private helper in
i915 - fetch_and_zero, see latest patch.
b) C++ [2]: 'exchange' from utility header.
If the idea is OK there are still 2 questions to answer:
1. Name of the helper, __xchg follows kernel conventions,
but for me Rust names are also OK.
2. Where to put the helper:
a) as in this patchset include/linux/non-atomic/xchg.h,
proposed by Andy Shevchenko,
b) include/linux/utils.h ? any better name? Some kind
of container for simple helpers.
All __xchg conversions were performed using cocci script,
then manually adjusted if necessary.
There is lot of places it can be used in, I have just chosen
some of them. I can provide cocci script to detect others (not all),
if necessary.
Changes:
v2: squashed all __xchg -> __arch_xchg t one patch (Arnd)
v3: fixed alpha/xchg_local (lkp@intel.com)
v4: adjusted indentation (Heiko)
v5: added more __xchg conversions - patches 3-6, added tags
[1]: https://doc.rust-lang.org/std/mem/index.html
[2]: https://en.cppreference.com/w/cpp/header/utility
Regards
Andrzej
Andrzej Hajda (7):
arch: rename all internal names __xchg to __arch_xchg
linux/include: add non-atomic version of xchg
arch/*/uprobes: simplify arch_uretprobe_hijack_return_addr
llist: simplify __llist_del_all
io_uring: use __xchg if possible
qed: use __xchg if possible
drm/i915/gt: use __xchg instead of internal helper
arch/alpha/include/asm/cmpxchg.h | 10 +++++-----
arch/arc/include/asm/cmpxchg.h | 4 ++--
arch/arm/include/asm/cmpxchg.h | 7 ++++---
arch/arm/probes/uprobes/core.c | 8 ++------
arch/arm64/include/asm/cmpxchg.h | 7 +++----
arch/arm64/kernel/probes/uprobes.c | 9 ++-------
arch/csky/kernel/probes/uprobes.c | 9 ++-------
arch/hexagon/include/asm/cmpxchg.h | 10 +++++-----
arch/ia64/include/asm/cmpxchg.h | 2 +-
arch/ia64/include/uapi/asm/cmpxchg.h | 4 ++--
arch/loongarch/include/asm/cmpxchg.h | 4 ++--
arch/m68k/include/asm/cmpxchg.h | 6 +++---
arch/mips/include/asm/cmpxchg.h | 4 ++--
arch/mips/kernel/uprobes.c | 10 ++--------
arch/openrisc/include/asm/cmpxchg.h | 10 +++++-----
arch/parisc/include/asm/cmpxchg.h | 4 ++--
arch/powerpc/include/asm/cmpxchg.h | 4 ++--
arch/powerpc/kernel/uprobes.c | 10 ++--------
arch/riscv/include/asm/atomic.h | 2 +-
arch/riscv/include/asm/cmpxchg.h | 4 ++--
arch/riscv/kernel/probes/uprobes.c | 9 ++-------
arch/s390/include/asm/cmpxchg.h | 8 ++++----
arch/s390/kernel/uprobes.c | 7 ++-----
arch/sh/include/asm/cmpxchg.h | 4 ++--
arch/sparc/include/asm/cmpxchg_32.h | 4 ++--
arch/sparc/include/asm/cmpxchg_64.h | 6 +++---
arch/sparc/kernel/uprobes.c | 7 ++-----
arch/xtensa/include/asm/cmpxchg.h | 4 ++--
drivers/gpu/drm/i915/gt/intel_engine_cs.c | 2 +-
.../gpu/drm/i915/gt/intel_engine_heartbeat.c | 4 ++--
.../drm/i915/gt/intel_execlists_submission.c | 4 ++--
drivers/gpu/drm/i915/gt/intel_ggtt.c | 4 ++--
drivers/gpu/drm/i915/gt/intel_gsc.c | 2 +-
drivers/gpu/drm/i915/gt/intel_gt.c | 4 ++--
drivers/gpu/drm/i915/gt/intel_gt_pm.c | 2 +-
drivers/gpu/drm/i915/gt/intel_lrc.c | 6 +++---
drivers/gpu/drm/i915/gt/intel_migrate.c | 2 +-
drivers/gpu/drm/i915/gt/intel_rc6.c | 2 +-
drivers/gpu/drm/i915/gt/intel_rps.c | 2 +-
drivers/gpu/drm/i915/gt/selftest_context.c | 2 +-
.../drm/i915/gt/selftest_ring_submission.c | 2 +-
drivers/gpu/drm/i915/gt/selftest_timeline.c | 2 +-
drivers/gpu/drm/i915/gt/uc/intel_gsc_uc.c | 2 +-
drivers/gpu/drm/i915/gt/uc/intel_uc.c | 2 +-
drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c | 2 +-
drivers/gpu/drm/i915/i915_utils.h | 1 +
include/linux/llist.h | 6 ++----
include/linux/non-atomic/xchg.h | 19 +++++++++++++++++++
include/linux/qed/qed_chain.h | 19 +++++++------------
io_uring/io_uring.c | 7 ++-----
io_uring/slist.h | 6 ++----
51 files changed, 126 insertions(+), 155 deletions(-)
create mode 100644 include/linux/non-atomic/xchg.h
--
2.34.1
next reply other threads:[~2023-01-18 15:36 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-18 15:35 Andrzej Hajda [this message]
2023-01-18 15:44 ` [PATCH v5 1/7] arch: rename all internal names __xchg to __arch_xchg Andrzej Hajda
2023-01-18 15:44 ` [PATCH v5 2/7] linux/include: add non-atomic version of xchg Andrzej Hajda
2023-02-27 9:53 ` [Intel-gfx] " Andi Shyti
2023-01-18 15:44 ` [PATCH v5 3/7] arch/*/uprobes: simplify arch_uretprobe_hijack_return_addr Andrzej Hajda
2023-02-27 9:54 ` [Intel-gfx] " Andi Shyti
2023-01-18 15:44 ` [PATCH v5 4/7] llist: simplify __llist_del_all Andrzej Hajda
2023-02-27 9:55 ` [Intel-gfx] " Andi Shyti
2023-01-18 15:44 ` [PATCH v5 5/7] io_uring: use __xchg if possible Andrzej Hajda
2023-02-27 9:59 ` [Intel-gfx] " Andi Shyti
2023-01-18 15:44 ` [PATCH v5 6/7] qed: " Andrzej Hajda
2023-02-27 9:56 ` [Intel-gfx] " Andi Shyti
2023-01-18 15:44 ` [PATCH v5 7/7] drm/i915/gt: use __xchg instead of internal helper Andrzej Hajda
2023-02-27 9:58 ` [Intel-gfx] " Andi Shyti
2023-02-27 9:53 ` [Intel-gfx] [PATCH v5 1/7] arch: rename all internal names __xchg to __arch_xchg Andi Shyti
2023-02-22 10:36 ` [Intel-gfx] [PATCH v5 0/7] Introduce __xchg, non-atomic xchg Andrzej Hajda
2023-02-22 17:04 ` Peter Zijlstra
2023-02-23 21:24 ` [Intel-gfx] " Andrzej Hajda
2023-02-27 13:49 ` Peter Zijlstra
2024-04-05 14:47 ` Jani Nikula
2024-04-05 16:20 ` Andrzej Hajda
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