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SubjectRe: [PATCH v3 2/7] lib/hexdump.c: Relax rowsize checks in hex_dump_to_buffer
From
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Hi,
Just a comment style nit below...

On 6/16/19 7:04 PM, Alastair D'Silva wrote:
> From: Alastair D'Silva <alastair@d-silva.org>
>
> This patch removes the hardcoded row limits and allows for
> other lengths. These lengths must still be a multiple of
> groupsize.
>
> This allows structs that are not 16/32 bytes to display on
> a single line.
>
> This patch also expands the self-tests to test row sizes
> up to 64 bytes (though they can now be arbitrarily long).
>
> Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
> ---
> lib/hexdump.c | 48 ++++++++++++++++++++++++++++--------------
> lib/test_hexdump.c | 52 ++++++++++++++++++++++++++++++++++++++--------
> 2 files changed, 75 insertions(+), 25 deletions(-)
>
> diff --git a/lib/hexdump.c b/lib/hexdump.c
> index 81b70ed37209..3943507bc0e9 100644
> --- a/lib/hexdump.c
> +++ b/lib/hexdump.c

> @@ -246,17 +248,29 @@ void print_hex_dump(const char *level, const char *prefix_str, int prefix_type,
> {
> const u8 *ptr = buf;
> int i, linelen, remaining = len;
> - unsigned char linebuf[32 * 3 + 2 + 32 + 1];
> + unsigned char *linebuf;
> + unsigned int linebuf_len;
>
> - if (rowsize != 16 && rowsize != 32)
> - rowsize = 16;
> + if (rowsize % groupsize)
> + rowsize -= rowsize % groupsize;
> +
> + /* Worst case line length:
> + * 2 hex chars + space per byte in, 2 spaces, 1 char per byte in, NULL
> + */

According to Documentation/process/coding-style.rst:

The preferred style for long (multi-line) comments is:

.. code-block:: c

/*
* This is the preferred style for multi-line
* comments in the Linux kernel source code.
* Please use it consistently.
*
* Description: A column of asterisks on the left side,
* with beginning and ending almost-blank lines.
*/


except in networking software.


> + linebuf_len = rowsize * 3 + 2 + rowsize + 1;
> + linebuf = kzalloc(linebuf_len, GFP_KERNEL);
> + if (!linebuf) {
> + printk("%s%shexdump: Could not alloc %u bytes for buffer\n",
> + level, prefix_str, linebuf_len);
> + return;
> + }


--
~Randy

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