linux-kernel - Re: [PATCH v30 08/20] x86/sgx: Add functions to allocate and free EPC pages

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Date:   Wed, 27 May 2020 22:46:38 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, nhorman@...hat.com, npmccallum@...hat.com,
        haitao.huang@...el.com, andriy.shevchenko@...ux.intel.com,
        tglx@...utronix.de, kai.svahn@...el.com, josh@...htriplett.org,
        luto@...nel.org, kai.huang@...el.com, rientjes@...gle.com,
        cedric.xing@...el.com, puiterwijk@...hat.com,
        Jethro Beekman <jethro@...tanix.com>
Subject: Re: [PATCH v30 08/20] x86/sgx: Add functions to allocate and free
 EPC pages

On Tue, May 26, 2020 at 09:21:11PM -0700, Sean Christopherson wrote:
> In other words, sgx_alloc_epc_section() is poorly named.  It doesn't
> actually allocate EPC, it allocates kernel structures to map and track EPC.
> sgx_(un)map_epc_section() would be more accurate and would hopefully
> alleviate some of the confusion.

Makes sense.

> I have no objection to renaming __sgx_alloc_try_alloc_page() to something
> like sgx_alloc_epc_page_section or whatever, but IMO using get/put will be
> horrendously confusing.

Ok. My only issue is that the naming nomenclature sounds strange and
confusing as it is. "try" in an "alloc" function is kinda tautological -
of course the function will try to do its best. :)

And there are three functions having "alloc" in the name so I can
imagine someone getting very confused when having to stare at that code.

So at least naming them in a way so that it is clear what kind of pages
they "allocate" - i.e., what they actually do - would be a step in the
right direction...

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette