Re: [PATCH v2 7/8] riscv: Kconfig: enable HAVE_RELIABLE_STACKTRACE and HAVE_LIVEPATCH

On 5/28/26 4:23 PM, Wang Han wrote:
> Now that the metadata frame records, the kunwind state machine and
> arch_stack_walk_reliable() are all in place, advertise the capability
> to the rest of the kernel:
> 
>    * select HAVE_RELIABLE_STACKTRACE under FRAME_POINTER && 64BIT, so
>      only the configurations that actually have the metadata records
>      and the FP-based reliable walker enable it.


The 64BIT gate is conservative scoping rather than a hard technical
requirement: the metadata frame record, kunwind state machine and
arch_stack_walk_reliable() all build on RV32 too (and the
call_on_irq_stack change in patch 2/8 actually fixes a latent RV32
issue). However, the syscall livepatch selftest and module relocation
path have only been exercised on RV64 (QEMU virt SMP=2/4/8). The
64BIT gate can be dropped in a follow-up once RV32 has equivalent
coverage.

Reviewed-by: Shuai Xue <[email protected]>

Thanks.
Shuai