linux-kernel - Re: [PATCH] mm,hwpoison: return -EBUSY when page already poisoned

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Message-ID: <20210226105250.3a15e35c@alex-virtual-machine>
Date:   Fri, 26 Feb 2021 10:52:50 +0800
From:   Aili Yao <yaoaili@...gsoft.com>
To:     Oscar Salvador <osalvador@...e.de>
CC:     "HORIGUCHI NAOYA堀口　直也)" 
        <naoya.horiguchi@....com>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "david@...hat.com" <david@...hat.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "bp@...en8.de" <bp@...en8.de>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
        "linux-edac@...r.kernel.org" <inux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "yangfeng1@...gsoft.com" <yangfeng1@...gsoft.com>
Subject: Re: [PATCH] mm,hwpoison: return -EBUSY when page already poisoned

Hi naoya,Oscar,david:
> 
> > We could use some negative value (error code) to report the reported case,
> > then as you mentioned above, some callers need change to handle the
> > new case, and the same is true if you use some positive value.
> > My preference is -EHWPOISON, but other options are fine if justified well.  
> 
> -EHWPOISON seems like a good fit.
> 
I am OK with the -EHWPOISON error code, But I have one doubt here:
When we return this -EHWPOISON error code, Does this means we have to add a new error code
to error-base.h or errno.h? Is this easy realized?

Thanks!
Aili Yao