linux-kernel - Re: [PATCH 1/3] lib: Introduce copy_from

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Message-ID: <20201116172435.GA29722@infradead.org>
Date:   Mon, 16 Nov 2020 17:24:35 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Zhaoxiu Zeng <zengzhaoxiu@....com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, Zhaoxiu Zeng <zhaoxiu.zeng@...il.com>
Subject: Re: [PATCH 1/3] lib: Introduce copy_from_back()

> +#define FAST_COPY_SAFEGUARD_SIZE (sizeof(long) * 2 - 1)
> +
> +#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
> +
> +/*
> + * The caller must ensure that the output buffer has enough space (len + FAST_COPY_SAFEGUARD_SIZE),
> + * so we can write 2 words per loop without overflowing the output buffer
> + */
> +static __always_inline u8 *copy_from_back_fast(u8 *out, size_t dist, size_t len)

The code is pretty unreadable with these longs lines.  Please stick to
the normal 80 char limit.