linux-kernel - [PATCH v2 00/10] x86: Clean up percpu operations

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Date:   Sat, 30 May 2020 18:11:17 -0400
From:   Brian Gerst <brgerst@...il.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Brian Gerst <brgerst@...il.com>
Subject: [PATCH v2 00/10] x86: Clean up percpu operations

The core percpu operations already have a switch on the width of the
data type, which resulted in an extra amount of dead code being
generated with the x86 operations having another switch.  This patch set
rewrites the x86 ops to remove the switch.  Additional cleanups are to
use named assembly operands, and to cast variables to the width used in
the assembly to make Clang happy.

Changes from v1:
- Add separate patch for XADD constraint fix
- Fixed sparse truncation warning
- Add cleanup of percpu_stable_op()
- Add patch to Remove PER_CPU()

Brian Gerst (10):
  x86/percpu: Introduce size abstraction macros
  x86/percpu: Clean up percpu_to_op()
  x86/percpu: Clean up percpu_from_op()
  x86/percpu: Clean up percpu_add_op()
  x86/percpu: Remove "e" constraint from XADD
  x86/percpu: Clean up percpu_add_return_op()
  x86/percpu: Clean up percpu_xchg_op()
  x86/percpu: Clean up percpu_cmpxchg_op()
  x86/percpu: Clean up percpu_stable_op()
  x86/percpu: Remove unused PER_CPU() macro

 arch/x86/include/asm/percpu.h | 510 ++++++++++++----------------------
 1 file changed, 172 insertions(+), 338 deletions(-)


base-commit: 229aaa8c059f2c908e0561453509f996f2b2d5c4
-- 
2.25.4