linux-kernel - [GIT PULL] Core kernel bug handling infrastructure changes for v6.19

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Message-ID: <aS1_wFqXNmDh84jJ@gmail.com>
Date: Mon, 1 Dec 2025 12:45:04 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Heiko Carstens <hca@...ux.ibm.com>
Subject: [GIT PULL] Core kernel bug handling infrastructure changes for v6.19

Linus,

Please pull the latest core/bugs Git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-bugs-2025-12-01

   # HEAD: b0a848f4a47a91a6b4d9a9fd739d047254df5a91 x86/bugs: Make i386 use GENERIC_BUG_RELATIVE_POINTERS

 [ MERGE NOTE: this pull request depends on you having 
   pulled the objtool-core-2025-12-01 tree already. If 
   you haven't yet then please disregard this pull 
   request. ]

Core kernel bug handling infrastructure changes for v6.19:

  - Improve WARN(), which has vararg printf like arguments,
    to work with the x86 #UD based WARN-optimizing infrastructure
    by hiding the format in the bug_table and replacing this
    first argument with the address of the bug-table entry,
    while making the actual function that's called a UD1 instruction.
    (Peter Zijlstra)

  - Introduce the CONFIG_DEBUG_BUGVERBOSE_DETAILED Kconfig switch
    (Ingo Molnar, s390 support by Heiko Carstens)

Fixes and cleanups:

  - bugs/s390: Remove private WARN_ON() implementation (Heiko Carstens)

  - <asm/bugs.h>: Make i386 use GENERIC_BUG_RELATIVE_POINTERS
    (Peter Zijlstra)

 Thanks,

	Ingo

------------------>
Heiko Carstens (2):
      bugs/s390: Use 'cond_str' in __EMIT_BUG()
      bugs/s390: Remove private WARN_ON() implementation

Ingo Molnar (15):
      bugs/core: Extend __WARN_FLAGS() with the 'cond_str' parameter
      bugs/core: Pass down the condition string of WARN_ON_ONCE(cond) warnings to __WARN_FLAGS()
      bugs/core: Introduce the CONFIG_DEBUG_BUGVERBOSE_DETAILED Kconfig switch
      bugs/x86: Extend _BUG_FLAGS() with the 'cond_str' parameter
      bugs/x86: Augment warnings output by concatenating 'cond_str' with the regular __FILE__ string in _BUG_FLAGS()
      bugs/powerpc: Pass in 'cond_str' to BUG_ENTRY()
      bugs/powerpc: Concatenate 'cond_str' with '__FILE__' in BUG_ENTRY(), to extend WARN_ON/BUG_ON output
      bugs/LoongArch: Pass in 'cond_str' to __BUG_ENTRY()
      bugs/LoongArch: Concatenate 'cond_str' with '__FILE__' in __BUG_ENTRY(), to extend WARN_ON/BUG_ON output
      bugs/s390: Pass in 'cond_str' to __EMIT_BUG()
      bugs/riscv: Pass in 'cond_str' to __BUG_FLAGS()
      bugs/riscv: Concatenate 'cond_str' with '__FILE__' in __BUG_FLAGS(), to extend WARN_ON/BUG_ON output
      bugs/parisc: Concatenate 'cond_str' with '__FILE__' in __WARN_FLAGS(), to extend WARN_ON/BUG_ON output
      bugs/sh: Concatenate 'cond_str' with '__FILE__' in __WARN_FLAGS(), to extend WARN_ON/BUG_ON output
      bugs/core: Reorganize fields in the first line of WARNING output, add ->comm[] output

Peter Zijlstra (14):
      x86: Rework __bug_table helpers
      bug: Add BUG_FORMAT infrastructure
      bug: Clean up CONFIG_GENERIC_BUG_RELATIVE_POINTERS
      bug: Add BUG_FORMAT_ARGS infrastructure
      bug: Add report_bug_entry()
      bug: Implement WARN_ON() using __WARN_FLAGS()
      bug: Allow architectures to provide __WARN_printf()
      x86/bug: Add BUG_FORMAT basics
      x86/bug: Use BUG_FORMAT for DEBUG_BUGVERBOSE_DETAILED
      x86_64/bug: Implement __WARN_printf()
      x86/bug: Implement WARN_ONCE()
      x86_64/bug: Inline the UD1
      x86/bug: Fix BUG_FORMAT vs KASLR
      x86/bugs: Make i386 use GENERIC_BUG_RELATIVE_POINTERS


 arch/arm64/include/asm/bug.h     |   2 +-
 arch/loongarch/include/asm/bug.h |  27 ++++----
 arch/parisc/include/asm/bug.h    |   6 +-
 arch/powerpc/include/asm/bug.h   |  12 ++--
 arch/riscv/include/asm/bug.h     |  10 +--
 arch/s390/include/asm/bug.h      | 102 ++++++++++++---------------
 arch/sh/include/asm/bug.h        |   4 +-
 arch/x86/Kconfig                 |   2 +-
 arch/x86/entry/entry.S           |   8 +++
 arch/x86/include/asm/bug.h       | 146 ++++++++++++++++++++++++++++++---------
 arch/x86/kernel/static_call.c    |  13 +++-
 arch/x86/kernel/traps.c          | 119 ++++++++++++++++++++++++++++---
 include/asm-generic/bug.h        |  80 +++++++++++++++------
 include/linux/bug.h              |   8 +++
 kernel/panic.c                   |  16 +++--
 lib/Kconfig.debug                |  10 +++
 lib/bug.c                        |  90 ++++++++++++++++++++----
 17 files changed, 477 insertions(+), 178 deletions(-)