linux-kernel - [PATCH v1 00/14] x86/alternatives: Nest them

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Message-ID: <20240607111701.8366-1-bp@kernel.org>
Date: Fri,  7 Jun 2024 13:16:47 +0200
From: Borislav Petkov <bp@...nel.org>
To: X86 ML <x86@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
	"Borislav Petkov (AMD)" <bp@...en8.de>
Subject: [PATCH v1 00/14] x86/alternatives: Nest them

From: "Borislav Petkov (AMD)" <bp@...en8.de>

Hi,

here's the next revision

  [ v1 - the last one was v0 even if not denoted as such:
    https://lore.kernel.org/r/20240531123512.21427-1-bp@kernel.org ]

of the alternatives nesting patchset.

All feedback has been incorporated and testing with it still looks good.

Thx.

Changelog:

v0:
---

this is basically peterz's idea to nest the alternative macros with
a fix to an issue I encountered while testing.

For ease of bisection, the old macros are converted to the new, nested
variants in a step-by-step manner so that in case an issue is
encountered during testing, one can pinpoint the place where it fails
easier. Because debugging alternatives is a serious pain.

Testing here on my farm looks good but who knows what happens out there,
in the wild.

Thx.

Borislav Petkov (AMD) (13):
  x86/alternative: Zap alternative_ternary()
  x86/alternative: Convert alternative()
  x86/alternative: Convert alternative_2()
  x86/alternative: Convert alternative_input()
  x86/alternative: Convert alternative_io()
  x86/alternative: Convert alternative_call()
  x86/alternative: Convert alternative_call_2()
  x86/alternative: Convert ALTERNATIVE_TERNARY()
  x86/alternative: Convert ALTERNATIVE_3()
  x86/alternative: Convert the asm ALTERNATIVE() macro
  x86/alternative: Convert the asm ALTERNATIVE_2() macro
  x86/alternative: Convert the asm ALTERNATIVE_3() macro
  x86/alternative: Replace the old macros

Peter Zijlstra (1):
  x86/alternatives: Add nested alternatives macros

 arch/x86/include/asm/alternative.h | 225 +++++++++--------------------
 arch/x86/kernel/alternative.c      |  20 ++-
 arch/x86/kernel/fpu/xstate.h       |  14 +-
 tools/objtool/arch/x86/special.c   |  23 +++
 tools/objtool/special.c            |  16 +-
 5 files changed, 125 insertions(+), 173 deletions(-)

-- 
2.43.0