linux-kernel - Re: [PATCH] USB: dummy-hcd: Fix uninitialized array use in init()

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Message-ID: <CACtPs=Gg3C0KxdFnETHujAyis4hhKnCdV4_ZWqprHkXCXahFvw@mail.gmail.com>
Date:   Sat, 5 Dec 2020 19:47:01 +0700
From:   Minh Bùi Quang <minhquangbui99@...il.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Corentin Labbe <clabbe@...libre.com>,
        Jules Irenge <jbi.octave@...il.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: dummy-hcd: Fix uninitialized array use in init()

Vào Th 6, 4 thg 12, 2020 vào lúc 23:12 Alan Stern
<stern@...land.harvard.edu> đã viết:
> Does this initialization end up using less memory than an explicit
> memset() call?

You mean speed? In my opinion, there is no difference in speed between 2 ways.
When I compile this array initialization using gcc 5.4.0,  this
initialization becomes
mov instructions when MAX_NUM_UDC=2 and becomes rep stos when
MAX_NUM_UDC=32. I think it makes no difference when comparing with memset()

Thanks,
Quang Minh