linux-kernel - Re: [PATCH] LoongArch: Let cores_io_master cover the largest NR

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Date: Mon, 25 Dec 2023 17:19:16 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: maobibo <maobibo@...ngson.cn>
Cc: loongson-kernel@...ts.loongnix.cn, loongarch@...ts.linux.dev, 
	Xuefeng Li <lixuefeng@...ngson.cn>, Guo Ren <guoren@...nel.org>, 
	Xuerui Wang <kernel@...0n.name>, Jiaxun Yang <jiaxun.yang@...goat.com>, 
	linux-kernel@...r.kernel.org, Huacai Chen <chenhuacai@...ngson.cn>
Subject: Re: [PATCH] LoongArch: Let cores_io_master cover the largest NR_CPUS

On Mon, Dec 25, 2023 at 5:13 PM maobibo <maobibo@...ngson.cn> wrote:
>
>
>
> On 2023/12/25 下午3:00, Huacai Chen wrote:
> > Now loongson_system_configuration::cores_io_master only covers 64 cpus,
> > if NR_CPUS > 64 there will be memory corruption. So let cores_io_master
> > cover the largest NR_CPUS (256).
> >
> > Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> > ---
> >   arch/loongarch/include/asm/bootinfo.h | 4 ++--
> >   arch/loongarch/kernel/acpi.c          | 2 +-
> >   arch/loongarch/kernel/smp.c           | 2 +-
> >   3 files changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/loongarch/include/asm/bootinfo.h b/arch/loongarch/include/asm/bootinfo.h
> > index c60796869b2b..32fd0319594a 100644
> > --- a/arch/loongarch/include/asm/bootinfo.h
> > +++ b/arch/loongarch/include/asm/bootinfo.h
> > @@ -30,7 +30,7 @@ struct loongson_system_configuration {
> >       int boot_cpu_id;
> >       int cores_per_node;
> >       int cores_per_package;
> > -     unsigned long cores_io_master;
> > +     unsigned long cores_io_master[4];
> Can the hardcoded 4 be defined something like this?
>     DIV_ROUND_UP(CONFIG_NR_CPUS, sizeof(long))
Can this be used to define arrays?

Huacai

>
> the others LGTM.
>
> Regards
> Bibo Mao
> >       unsigned long suspend_addr;
> >       const char *cpuname;
> >   };
> > @@ -42,7 +42,7 @@ extern struct loongson_system_configuration loongson_sysconf;
> >
> >   static inline bool io_master(int cpu)
> >   {
> > -     return test_bit(cpu, &loongson_sysconf.cores_io_master);
> > +     return test_bit(cpu, loongson_sysconf.cores_io_master);
> >   }
> >
> >   #endif /* _ASM_BOOTINFO_H */
> > diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.c
> > index 8e00a754e548..b6b097bbf866 100644
> > --- a/arch/loongarch/kernel/acpi.c
> > +++ b/arch/loongarch/kernel/acpi.c
> > @@ -119,7 +119,7 @@ acpi_parse_eio_master(union acpi_subtable_headers *header, const unsigned long e
> >               return -EINVAL;
> >
> >       core = eiointc->node * CORES_PER_EIO_NODE;
> > -     set_bit(core, &(loongson_sysconf.cores_io_master));
> > +     set_bit(core, loongson_sysconf.cores_io_master);
> >
> >       return 0;
> >   }
> > diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c
> > index 9e33b5e36122..a16e3dbe9f09 100644
> > --- a/arch/loongarch/kernel/smp.c
> > +++ b/arch/loongarch/kernel/smp.c
> > @@ -208,7 +208,7 @@ static void __init fdt_smp_setup(void)
> >       }
> >
> >       loongson_sysconf.nr_cpus = num_processors;
> > -     set_bit(0, &(loongson_sysconf.cores_io_master));
> > +     set_bit(0, loongson_sysconf.cores_io_master);
> >   #endif
> >   }
> >
> >
>