linux-kernel - Re: [PATCH v38 16/24] x86/sgx: Add a page reclaimer

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Date:   Wed, 23 Sep 2020 18:25:02 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        linux-sgx@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Jethro Beekman <jethro@...tanix.com>,
        Jordan Hand <jorhand@...ux.microsoft.com>,
        Nathaniel McCallum <npmccallum@...hat.com>,
        Chunyang Hui <sanqian.hcy@...fin.com>,
        Seth Moore <sethmo@...gle.com>, akpm@...ux-foundation.org,
        andriy.shevchenko@...ux.intel.com, asapek@...gle.com,
        cedric.xing@...el.com, chenalexchen@...gle.com,
        conradparker@...gle.com, cyhanish@...gle.com,
        dave.hansen@...el.com, haitao.huang@...el.com,
        josh@...htriplett.org, kai.huang@...el.com, kai.svahn@...el.com,
        kmoy@...gle.com, ludloff@...gle.com, luto@...nel.org,
        nhorman@...hat.com, puiterwijk@...hat.com, rientjes@...gle.com,
        tglx@...utronix.de, yaozhangx@...gle.com
Subject: Re: [PATCH v38 16/24] x86/sgx: Add a page reclaimer

> 	if (IS_ERR(va_page)) <- needed a new VA page, allocation failed
> 		return PTR_ERR(va_page);
> 	else if (va_page)    <- needed a new VA page, allocation succeeded
> 		list_add(&va_page->list, &encl->va_pages);
> 	else
> 		             <- reused the current VA page

/* else the tail page of the VA page list had free slots. */

I added this comment as "the missing branch".

/Jarkko