[PATCH] riscv: cacheinfo: Fix using smp_processor_id() in preemptible
Atish Patra
atishp at atishpatra.org
Fri Dec 18 03:14:23 EST 2020
On Mon, Nov 16, 2020 at 12:08 AM Kefeng Wang <wangkefeng.wang at huawei.com> wrote:
>
> Use raw_smp_processor_id instead of smp_processor_id() to fix warning,
>
> BUG: using smp_processor_id() in preemptible [00000000] code: init/1
> caller is debug_smp_processor_id+0x1c/0x26
> CPU: 0 PID: 1 Comm: init Not tainted 5.10.0-rc4 #211
> Call Trace:
> walk_stackframe+0x0/0xaa
> show_stack+0x32/0x3e
> dump_stack+0x76/0x90
> check_preemption_disabled+0xaa/0xac
> debug_smp_processor_id+0x1c/0x26
> get_cache_size+0x18/0x68
> load_elf_binary+0x868/0xece
> bprm_execve+0x224/0x498
> kernel_execve+0xdc/0x142
> run_init_process+0x90/0x9e
> try_to_run_init_process+0x12/0x3c
> kernel_init+0xb4/0xf8
> ret_from_exception+0x0/0xc
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang at huawei.com>
> ---
> arch/riscv/kernel/cacheinfo.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/kernel/cacheinfo.c b/arch/riscv/kernel/cacheinfo.c
> index de59dd457b41..9b5a8a347434 100644
> --- a/arch/riscv/kernel/cacheinfo.c
> +++ b/arch/riscv/kernel/cacheinfo.c
> @@ -26,7 +26,7 @@ cache_get_priv_group(struct cacheinfo *this_leaf)
>
> static struct cacheinfo *get_cacheinfo(u32 level, enum cache_type type)
> {
> - struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(smp_processor_id());
> + struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(raw_smp_processor_id());
> struct cacheinfo *this_leaf;
> int index;
>
> --
> 2.26.2
>
>
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Reviewed-by: Atish Patra <atish.patra at wdc.com>
As this issue is only reproducible with CONFIG_PREEMPT, the commit
text can be updated to specify that. I have tested this patch with
Qemu as well. FWIW,
Tested-by: Atish Patra <atish.patra at wdc.com>
--
Regards,
Atish
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