Re: [PATCH] KVM: PPC: use assign_bit() where applicable

[Peng Fan]

Hi Shrikanth,
On Mon, Sep 21, 2026 at 02:39:34PM +0530, Shrikanth Hegde wrote:
>Hi Peng.
>
>On 9/20/26 7:56 AM, Peng Fan (OSS) wrote:
>> From: Peng Fan <peng.fan@xxxxxxx>
>> 
>> Convert open-coded if/else with set_bit/clear_bit to the assign_bit API.
>> 
>
>Reviewed-by: Shrikanth Hegde <sshegde@xxxxxxxxxxxxx>
>
>> Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
>> ---
>>   arch/powerpc/kvm/powerpc.c | 5 +----
>>   1 file changed, 1 insertion(+), 4 deletions(-)
>> 
>> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
>> index 9194cf492d1c..a567b63a5f1f 100644
>> --- a/arch/powerpc/kvm/powerpc.c
>> +++ b/arch/powerpc/kvm/powerpc.c
>> @@ -2210,10 +2210,7 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
>>   			break;
>>   		if (!kvmppc_book3s_hcall_implemented(kvm, hcall))
>>   			break;
>> -		if (cap->args[1])
>> -			set_bit(hcall / 4, kvm->arch.enabled_hcalls);
>> -		else
>> -			clear_bit(hcall / 4, kvm->arch.enabled_hcalls);
>> +		assign_bit(hcall / 4, kvm->arch.enabled_hcalls, cap->args[1]);
>>   		r = 0;
>>   		break;
>>   	}
>
>
>Just ensure you have covered all such possible open coding where applicable
>in arch/powerpc/.

My cocci rule as below, only one candicate for arch/powerpc/ is found.

// set_bit -> clear_bit => assign_bit

@@
expression cond, bit, addr;
@@

-if (cond)
-        set_bit(bit, addr);
-else
-        clear_bit(bit, addr);
+assign_bit(bit, addr, cond);


// clear_bit -> set_bit => assign_bit

@@
expression cond, bit, addr;
@@

-if (cond)
-        clear_bit(bit, addr);
-else
-        set_bit(bit, addr);
+assign_bit(bit, addr, !cond);


// __set_bit -> __clear_bit => __assign_bit

@@
expression cond, bit, addr;
@@

-if (cond)
-        __set_bit(bit, addr);
-else
-        __clear_bit(bit, addr);
+__assign_bit(bit, addr, cond);


// __clear_bit -> __set_bit => __assign_bit

@@
expression cond, bit, addr;
@@

-if (cond)
-        __clear_bit(bit, addr);
-else
-        __set_bit(bit, addr);
+__assign_bit(bit, addr, !cond);

Thanks
Peng
>