linux-kernel - Re: [PATCH] dax: enable dax fault handler to report VM_FAULT

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Date:   Thu, 6 Apr 2023 13:38:30 -0700
From:   Jane Chu <jane.chu@...cle.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     dan.j.williams@...el.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com, ira.weiny@...el.com, viro@...iv.linux.org.uk,
        brauner@...nel.org, nvdimm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] dax: enable dax fault handler to report VM_FAULT_HWPOISON

On 4/6/2023 12:32 PM, Matthew Wilcox wrote:
> On Thu, Apr 06, 2023 at 11:55:56AM -0600, Jane Chu wrote:
>>   static vm_fault_t dax_fault_return(int error)
>>   {
>>   	if (error == 0)
>>   		return VM_FAULT_NOPAGE;
>> -	return vmf_error(error);
>> +	else if (error == -ENOMEM)
>> +		return VM_FAULT_OOM;
>> +	else if (error == -EHWPOISON)
>> +		return VM_FAULT_HWPOISON;
>> +	return VM_FAULT_SIGBUS;
>>   }
> 
> Why would we want to handle it here instead of changing vmf_error()?

I think it's related to the comment about the the corrupted range of
a hwpoison caused fault - something no need to worry about now.

I will move the change to vmf_error() in a respin.

Thanks!
-jane