linux-kernel - Re: [PATCH] soc/fsl/qbman: Use for_each_online_cpu() instead of for_each

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Message-ID: <f3ecce9f-22cf-48e2-843e-63f08a577e69@linux.ibm.com>
Date: Mon, 11 Aug 2025 22:16:38 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: Fushuai Wang <wangfushuai@...du.com>
Cc: frederic@...nel.org, christophe.leroy@...roup.eu,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] soc/fsl/qbman: Use for_each_online_cpu() instead of
 for_each_cpu()

On 8/11/25 12:22, Fushuai Wang wrote:
> Replace the opencoded for_each_cpu(cpu, cpu_online_mask) loop with the
> more readable and equivalent for_each_online_cpu(cpu) macro.
> 
> Signed-off-by: Fushuai Wang <wangfushuai@...du.com>
> ---
>   drivers/soc/fsl/qbman/qman_test_stash.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/fsl/qbman/qman_test_stash.c b/drivers/soc/fsl/qbman/qman_test_stash.c
> index f4d3c2146f4f..6f7597950aa3 100644
> --- a/drivers/soc/fsl/qbman/qman_test_stash.c
> +++ b/drivers/soc/fsl/qbman/qman_test_stash.c
> @@ -103,7 +103,7 @@ static int on_all_cpus(int (*fn)(void))
>   {
>   	int cpu;
>   
> -	for_each_cpu(cpu, cpu_online_mask) {
> +	for_each_online_cpu(cpu) {
>   		struct bstrap bstrap = {
>   			.fn = fn,
>   			.started = ATOMIC_INIT(0)

Yes. This change makes sense given that for_each_online_cpu expands into the same.

Why not do for the remaining ones too?

linux_tip$ grep -Rw "for_each_cpu" * | grep  cpu_online_mask
arch/riscv/kernel/unaligned_access_speed.c:     for_each_cpu(cpu, cpu_online_mask) {
arch/riscv/kernel/unaligned_access_speed.c:     for_each_cpu(cpu, cpu_online_mask) {
drivers/soc/fsl/qbman/qman_test_stash.c:        for_each_cpu(cpu, cpu_online_mask) {    ** current patch addresses this.
drivers/infiniband/hw/hfi1/sdma.c:      for_each_cpu(cpu, cpu_online_mask) {
drivers/cpuidle/cpuidle-tegra.c:        for_each_cpu(lcpu, cpu_online_mask) {
include/rv/da_monitor.h:        for_each_cpu(cpu, cpu_online_mask) {
kernel/trace/trace_osnoise.c:   for_each_cpu(cpu, cpu_online_mask) {
kernel/trace/trace_osnoise.c:   for_each_cpu(cpu, cpu_online_mask) {

Rest everyone seems to have moved.
linux_tip$ grep -Rw "for_each_online_cpu" * | wc
     416    1141   23047