linux-kernel - Re: [PATCH] net: usb: Merge cpu_to_le32s + memcpy to put_unaligned

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Date:   Tue, 23 Jul 2019 10:16:27 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Steve Glendinning <steve.glendinning@...well.net>,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: usb: Merge cpu_to_le32s + memcpy to put_unaligned_le32

David Miller <davem@...emloft.net> 于2019年7月23日周二 上午9:22写道：
>
> From: Chuhong Yuan <hslester96@...il.com>
> Date: Mon, 22 Jul 2019 15:41:34 +0800
>
> > Merge the combo uses of cpu_to_le32s and memcpy.
> > Use put_unaligned_le32 instead.
> > This simplifies the code.
> >
> > Signed-off-by: Chuhong Yuan <hslester96@...il.com>
>
> Isn't the skb->data aligned to 4 bytes in these situations?
>
> If so, we should use the aligned variants.
>
> Thank you.

I have checked the five changed files.
I find that they all have used get_unaligned_le32 for skb->data
according to my previous applied patches and existing code.
So I think the skb->data is unaligned in these situations.

Usages of get_unaligned_le32:
asix_common.c: line 104 and 133
ax88179_178a.c: https://lkml.org/lkml/2019/7/19/652
lan78xx.c: https://lkml.org/lkml/2019/7/19/573
smsc75xx.c: https://lkml.org/lkml/2019/7/19/617
sr9800.c: line 73