linux-kernel - [PATCH 00/20] x86: Cleanup alternative_io() and friends, prep for asm

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Message-ID: <cover.1741988314.git.jpoimboe@kernel.org>
Date: Fri, 14 Mar 2025 14:41:13 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Uros Bizjak <ubizjak@...il.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 00/20] x86: Cleanup alternative_io() and friends, prep for asm_call()

Make the alternative_io() interface more straightforward and flexible,
and get rid of alternative_input().

These patches are a prereq for another set[1] which will get rid of
ASM_CALL_CONSTRAINT[2] in favor of a much more flexible asm_call()
interface similar to the new alternative_io().

[1] Additional 20+ patches not posted yet to avoid flooding inboxes

[2] ASM_CALL_CONSTRAINT is semi-broken with Clang+KCOV+KMSAN.
    https://lore.kernel.org/174108458465.14745.15292444415957816824.tip-bot2@tip-bot2/
    https://lore.kernel.org/174099976188.10177.7153571701278544000.tip-bot2@tip-bot2

Josh Poimboeuf (20):
  x86/cpu: Use named asm operands in prefetch[w]()
  x86/apic: Use named asm operands in native_apic_mem_write()
  x86/mm: Use named asm operands in task_size_max()
  x86/cpu: Use named asm operands in clflushopt()
  x86/asm: Always use flag output operands
  x86/asm: Remove CC_SET()
  x86/alternative: Remove operand numbering restrictions
  x86/asm: Replace ASM_{OUTPUT,INPUT}() with ARG()
  x86/alternative: Simplify alternative_io() interface
  x86/alternative: Add alternative_2_io()
  x86/alternative: Make alternative() a wrapper around alternative_io()
  x86/cpu: Use alternative_io() in prefetch[w]()
  x86/alternative: Remove alternative_input()
  x86/barrier: Use alternative_io() in 32-bit barrier functions
  x86/cpu/amd: Use named asm operands in asm_clear_divider()
  x86/cpu: Use alternative_io() in amd_clear_divider()
  x86/smap: Use named asm operands in smap_{save,restore}()
  x86/smap: Use alternative_io() in smap_{save,restore}()
  x86/uaccess: Use alternative_io() in __untagged_addr()
  x86/msr: Use alternative_2_io() in rdtsc_ordered()

 arch/x86/boot/bitops.h               |  2 +-
 arch/x86/boot/boot.h                 |  4 +-
 arch/x86/boot/string.c               |  2 +-
 arch/x86/include/asm/alternative.h   | 31 +++++-----
 arch/x86/include/asm/apic.h          |  7 ++-
 arch/x86/include/asm/archrandom.h    |  2 -
 arch/x86/include/asm/asm.h           | 21 +++----
 arch/x86/include/asm/atomic64_32.h   | 93 +++++++++++++++-------------
 arch/x86/include/asm/barrier.h       | 23 +++++--
 arch/x86/include/asm/bitops.h        |  6 --
 arch/x86/include/asm/cmpxchg.h       |  4 --
 arch/x86/include/asm/cmpxchg_32.h    |  2 -
 arch/x86/include/asm/cmpxchg_64.h    |  1 -
 arch/x86/include/asm/msr.h           | 13 ++--
 arch/x86/include/asm/page_64.h       | 16 ++---
 arch/x86/include/asm/percpu.h        |  4 --
 arch/x86/include/asm/processor.h     | 22 ++++---
 arch/x86/include/asm/rmwcc.h         | 24 +------
 arch/x86/include/asm/segment.h       |  5 +-
 arch/x86/include/asm/sev.h           |  1 -
 arch/x86/include/asm/signal.h        |  2 +-
 arch/x86/include/asm/smap.h          | 18 +++---
 arch/x86/include/asm/special_insns.h |  9 ++-
 arch/x86/include/asm/uaccess.h       |  1 -
 arch/x86/include/asm/uaccess_64.h    |  8 +--
 tools/arch/x86/include/asm/asm.h     | 10 +--
 tools/perf/bench/find-bit-bench.c    |  4 --
 27 files changed, 153 insertions(+), 182 deletions(-)

-- 
2.48.1