linux-kernel - Re: [PATCH v6 0/6] x86/vdso: VDSO updates and fixes for sframes

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Message-ID: <B1CDD538-668D-48E3-A937-740B7D6575FA@zytor.com>
Date: Sun, 01 Feb 2026 00:23:31 -0800
From: "H. Peter Anvin" <hpa@...or.com>
To: Jens Remus <jremus@...ux.ibm.com>, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, bpf@...r.kernel.org,
        x86@...nel.org, linux-mm@...ck.org,
        Steven Rostedt <rostedt@...nel.org>
CC: Josh Poimboeuf <jpoimboe@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrii Nakryiko <andrii@...nel.org>,
        Indu Bhagat <indu.bhagat@...cle.com>,
        "Jose E. Marchesi" <jemarch@....org>,
        Beau Belgrave <beaub@...ux.microsoft.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Florian Weimer <fweimer@...hat.com>, Kees Cook <kees@...nel.org>,
        "Carlos O'Donell" <codonell@...hat.com>, Sam James <sam@...too.org>,
        Dylan Hatch <dylanbhatch@...gle.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Hildenbrand <david@...hat.com>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
        Michal Hocko <mhocko@...e.com>, Mike Rapoport <rppt@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>
Subject: Re: [PATCH v6 0/6] x86/vdso: VDSO updates and fixes for sframes

On January 29, 2026 3:27:20 AM PST, Jens Remus <jremus@...ux.ibm.com> wrote:
>This enables generation of SFrame V3 stack trace information for VDSO on
>x86-64.  It's a continuation of Josh's and Steve's work:
>
>   https://lore.kernel.org/all/cover.1737511963.git.jpoimboe@kernel.org/
>   https://lore.kernel.org/all/20250422183439.895236512@goodmis.org/
>
>This series focuses only on the VDSO code. They are helpful fixes
>and updates that doesn't rely on sframes (although the last patch
>is sframe related).
>
>This series applies on top of the latest unwind user sframe series
>"[PATCH v13 00/18] unwind_deferred: Implement sframe handling":
>https://lore.kernel.org/all/20260127150554.2760964-1-jremus@linux.ibm.com/
>
>Like above series it depends on the upcoming binutils 2.46 release to
>be used to build executables and libraries such as VDSO with SFrame V3
>stack trace information (using the assembler option --gsframe-3).
>
>Changes in v6:
>- SFrame V3 support (SFrame V2 is not supported).
>- Prevent GNU_SFRAME program table entry to empty .sframe section.
>- Integrate v5 review feedback. (Josh)
>
>Regards,
>Jens
>
>
>Josh Poimboeuf (6):
>  x86/vdso: Fix DWARF generation for getrandom()
>  x86/asm: Avoid emitting DWARF CFI for non-VDSO
>  x86/asm: Simplify VDSO DWARF generation
>  x86/vdso: Use SYM_FUNC_{START,END} in __kernel_vsyscall()
>  x86/vdso: Use CFI macros in __vdso_sgx_enter_enclave()
>  x86/vdso: Enable sframe generation in VDSO
>
> arch/Kconfig                             |  7 +++
> arch/x86/entry/vdso/Makefile             | 10 +++--
> arch/x86/entry/vdso/vdso-layout.lds.S    |  9 +++-
> arch/x86/entry/vdso/vdso32/system_call.S | 10 +----
> arch/x86/entry/vdso/vgetrandom-chacha.S  |  3 +-
> arch/x86/entry/vdso/vsgx.S               | 19 +++------
> arch/x86/include/asm/dwarf2.h            | 54 +++++++++++++++++-------
> arch/x86/include/asm/linkage.h           | 33 ++++++++++++---
> arch/x86/include/asm/vdso.h              |  1 -
> 9 files changed, 97 insertions(+), 49 deletions(-)
>

This patchset clashes *hard* with the changes already in tip:x86/entry.