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

Jens Remus
2026-02-03T17:23:24Z

On 2/1/2026 9:23 AM, H. Peter Anvin wrote:
> On January 29, 2026 3:27:20 AM PST, Jens Remus <jremus@linux.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).

>> 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.

Thank you for the hint! I have rebased the series on top of
tip:x86/entry and sent a v7 for review:

[PATCH v7 0/6] x86/vdso: VDSO updates and fixes for sframes
https://lore.kernel.org/all/20260203171958.1522030-1-jremus@linux.ibm.com/

Regards,
Jens
--
Jens Remus
Linux on Z Development (D3303)
jremus@de.ibm.com / jremus@linux.ibm.com

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