Re: [PATCH 6.18 000/212] 6.18.20-rc1 review

Miguel Ojeda
2026-03-25T01:04:12Z

On Mon, 23 Mar 2026 14:43:41 +0100 Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote:
>
> This is the start of the stable review cycle for the 6.18.20 release.
> There are 212 patches in this series, all will be posted as a response
> to this one. If anyone has any issues with these being applied, please
> let me know.
>
> Responses should be made by Wed, 25 Mar 2026 13:44:33 +0000.
> Anything received after that time might be too late.

Boot-tested under QEMU for Rust x86_64, arm64 and riscv64; built-tested
for loongarch64:

Tested-by: Miguel Ojeda <ojeda@kernel.org>

For UML, I am seeing:

In file included from kernel/fork.c:108:
In file included from ./include/linux/unwind_deferred.h:6:
In file included from ./include/linux/unwind_user.h:6:
./arch/x86/include/asm/unwind_user.h:23:12: error: no member named 'flags' in 'struct pt_regs'
23 | if (regs->flags & X86_VM_MASK)
| ~~~~ ^
./arch/x86/include/asm/unwind_user.h:23:20: error: use of undeclared identifier 'X86_VM_MASK'
23 | if (regs->flags & X86_VM_MASK)
| ^
./arch/x86/include/asm/unwind_user.h:26:7: error: call to undeclared function 'user_64bit_mode'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
26 | if (!user_64bit_mode(regs))
| ^

We probably need at least:

aa7387e79a5c ("unwind_user/x86: Fix arch=um build")

Or perhaps the split of the guards added later.

Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>

Cc: Richard Weinberger <richard@nod.at>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: linux-um@lists.infradead.org

I hope that helps!

Cheers,
Miguel