> diff --git a/arch/x86/kernel/perf_regs.c b/arch/x86/kernel/perf_regs.c
> index e47b2dbbdef3..9284048cf5b0 100644
> --- a/arch/x86/kernel/perf_regs.c
> +++ b/arch/x86/kernel/perf_regs.c
> @@ -157,6 +157,15 @@ void perf_get_regs_user(struct perf_regs *regs_user,
>        */
>       regs_user_copy->bx = -1;
>       regs_user_copy->bp = -1;
> +     if (user_64bit_mode(user_regs)) {

Why is it 64bit only? Should work on 32bit too.

-Andi

> +             /*
> +              * Store user space frame-pointer value on sample
> +              * to facilitate stack unwinding for cases when
> +              * user space x86_64 executable code has such
> +              * support enabled at compile time;
> +              */
> +             regs_user_copy->bp = user_regs->bp;
> +     }
>       regs_user_copy->r12 = -1;
>       regs_user_copy->r13 = -1;
>       regs_user_copy->r14 = -1;

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