RE: [PATCH] riscv: Move call to init_cpu_topology() to later initialization stage

[Leyfoon Tan]

> -----Original Message-----
> From: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
> Sent: Tuesday, 3 January, 2023 2:54 PM
> To: Leyfoon Tan <leyfoon.tan@xxxxxxxxxxxxxxxx>
> Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>; Paul Walmsley
> <paul.walmsley@xxxxxxxxxx>; Albert Ou <aou@xxxxxxxxxxxxxxxxx>; linux-
> riscv@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Ley Foon Tan
> <lftan.linux@xxxxxxxxx>
> Subject: Re: [PATCH] riscv: Move call to init_cpu_topology() to later
> initialization stage
> 
> On Tue, Jan 03, 2023 at 11:53:16AM +0800, Ley Foon Tan wrote:
> > topology_parse_cpu_capacity() is failed to allocate memory with
> > kcalloc() after read "capacity-dmips-mhz" DT parameter in CPU DT
> > nodes. This
> > topology_parse_cpu_capacity() is called from init_cpu_topology(), move
> > call to init_cpu_topology() to later initialization  stage (after
> > memory allocation is available).
> >
> > Note, this refers to ARM64 implementation, call init_cpu_topology() in
> > smp_prepare_cpus().
> >
> > Tested on Qemu platform.
> 
> Hi Ley,
> 
> Can you provide the topologies (command lines) tested?
2 clusters with 2 CPU cores each.

> 
> >
> > Signed-off-by: Ley Foon Tan <leyfoon.tan@xxxxxxxxxxxxxxxx>
> 
> Fixes tag?
Okay, will send out next revision with Fixes tag.

Fixes: 03f11f03dbfe ("RISC-V: Parse cpu topology during boot. ")


[...]

> >  arch/riscv/kernel/smpboot.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
> > index 3373df413c88..ddb2afba6d25 100644
> > --- a/arch/riscv/kernel/smpboot.c
> > +++ b/arch/riscv/kernel/smpboot.c
> > @@ -39,7 +39,6 @@ static DECLARE_COMPLETION(cpu_running);
> >
> >  void __init smp_prepare_boot_cpu(void)  {
> > -	init_cpu_topology();
> >  }
> >
> >  void __init smp_prepare_cpus(unsigned int max_cpus) @@ -48,6 +47,8
> @@
> > void __init smp_prepare_cpus(unsigned int max_cpus)
> >  	int ret;
> >  	unsigned int curr_cpuid;
> >
> > +	init_cpu_topology();
> > +
> >  	curr_cpuid = smp_processor_id();
> >  	store_cpu_topology(curr_cpuid);
> >  	numa_store_cpu_info(curr_cpuid);
> > --
> > 2.25.1
> >
> 
> Otherwise,
> 
> Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
> 
> Thanks,
> drew

Thanks
Ley Foon