linux-kernel - Re: [PATCH v1 1/8] lib/uuid: Introduce uuid_{be|le}_cmp

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Date:   Sun, 23 Apr 2017 15:42:35 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Winkler, Tomas" <tomas.winkler@...el.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        "Koul, Vinod" <vinod.koul@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH v1 1/8] lib/uuid: Introduce uuid_{be|le}_cmp_p{p}() helpers

On Sun, Apr 23, 2017 at 1:29 PM, Winkler, Tomas <tomas.winkler@...el.com> wrote:
>> New helpers take pointers to uuid_{be|le} as parameters.
>>
>> When using them on a raw data we don't need to do an ugly dereference and,
>> in some cases, a type casting.

> I think this going overboard, the _pp types  are just enough.
I looked at existing users and there are cases like
#define XXX_UUID UUID_...(a, b, c, ...)

uuid_.*_cmp(value, XXX_UUID)

For _pp variant if would be _cmp_pp(value, &XXX_UUID) which is
slightly worse than for _p variant.

-- 
With Best Regards,
Andy Shevchenko