On 5/17/22 1:54 AM, Will Deacon wrote:
> On Fri, May 13, 2022 at 04:32:53PM -0700, Srivatsa S. Bhat wrote:
>> On 5/13/22 10:46 AM, Elliot Berman wrote:
>>> From: Prakruthi Deepak Heragu <quic_pheragu@xxxxxxxxxxx>
>>>
[...]
>>> static int stolen_time_cpu_down_prepare(unsigned int cpu)
>>> {
>>> + struct pvclock_vcpu_stolen_time *kaddr = NULL;
>>> struct pv_time_stolen_time_region *reg;
>>>
>>> reg = this_cpu_ptr(&stolen_time_region);
>>> if (!reg->kaddr)
>>> return 0;
>>>
>>> - memunmap(reg->kaddr);
>>> - memset(reg, 0, sizeof(*reg));
>>> + kaddr = rcu_replace_pointer(reg->kaddr, NULL, true);
>>> + synchronize_rcu();
>>> + memunmap(kaddr);
>>>
>>
>> The original code used to memset the stolen time region, but this
>> patch seems to drop it. Was that change intentional?
>
> 'struct pv_time_stolen_time_region' only has one field ('kaddr'), which
> we're now clearing with rcu_replace_pointer() so the memset doesn't make
> sense.
>
Ah right, never mind :)
Thank you!
Regards,
Srivatsa
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