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Date: Wed, 9 Dec 2015 14:03:16 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Joe Perches <joe@...ches.com>
Cc: Rob Herring <robh+dt@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
Frank Rowand <frowand.list@...il.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Grant Likely <grant.likely@...aro.org>
Subject: Re: [PATCH v2] of/address: replace printk() with pr_debug() / pr_err()
On Wed, Dec 9, 2015 at 2:03 AM, Joe Perches <joe@...ches.com> wrote:
> On Tue, 2015-12-08 at 15:28 -0600, Rob Herring wrote:
>> On Tue, Dec 8, 2015 at 11:03 AM, Joe Perches <joe@...ches.com> wrote:
>> > On Tue, 2015-12-08 at 08:16 -0800, Joe Perches wrote:
>> > > On Wed, 2015-12-09 at 01:07 +0900, Masahiro Yamada wrote:
>> > > > Trivial changes suggested by checkpatch.pl.
>> > > []
>> > > > diff --git a/drivers/of/address.c b/drivers/of/address.c
>> > > []
>> > > > @@ -23,7 +23,7 @@ static int __of_address_to_resource(struct device_node *dev,
>> > > > #ifdef DEBUG
>> > > > static void of_dump_addr(const char *s, const __be32 *addr, int na)
>> > > > {
>> > > > - printk(KERN_DEBUG "%s", s);
>> > > > + pr_debug("%s", s);
>> > > > while (na--)
>> > > > printk(" %08x", be32_to_cpu(*(addr++)));
>> > > > printk("\n");
> []
>> > static void of_dumpaddr(const char *s, const __be32 *addr, int na)
>> > {
>> > print_hex_dump_debug(s, DUMP_PREFIX_NONE, 16, 1,
>> > addr, na * sizeof(__be32), false);
>> > }
>>
>> Except that it doesn't do the endian swapping. Looking closer at this,
>> we should just drop this hunk. So I will take v1.
>
> Maybe endian conversions should be added to hex_dump_debug like:
> (probably doesn't apply. Evolution 3.18 is horrible)
Overall the idea is not bad I think, though few comments below.
Besides that, please, update test_hexdump (wrt my update to the test
suite [1]) to go through BE test cases.
[1] http://www.spinics.net/lists/kernel/msg2139337.html
> ---
> include/linux/printk.h | 7 +++++++
> lib/hexdump.c | 56 +++++++++++++++++++++++++++++++++++---------------
> 2 files changed, 47 insertions(+), 16 deletions(-)
>
> diff --git a/include/linux/printk.h b/include/linux/printk.h
> index 9729565..4be190c 100644
> --- a/include/linux/printk.h
> +++ b/include/linux/printk.h
> @@ -424,6 +424,13 @@ enum {
> DUMP_PREFIX_ADDRESS,
> DUMP_PREFIX_OFFSET
> };
> +
> +enum {
> + DUMP_TYPE_CPU = 0,
Do we need explicit enum for that? Documentation update anyway is required.
> + DUMP_TYPE_LE = BIT(30),
> + DUMP_TYPE_BE = BIT(31)
> +};
> +
> extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
> int groupsize, char *linebuf, size_t linebuflen,
> bool ascii);
> diff --git a/lib/hexdump.c b/lib/hexdump.c
> index 992457b..49113aa 100644
> --- a/lib/hexdump.c
> +++ b/lib/hexdump.c
> @@ -81,6 +81,7 @@ EXPORT_SYMBOL(bin2hex);
> * @len: number of bytes in the @buf
> * @rowsize: number of bytes to print per line; must be 16 or 32
> * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
> + * OR'd with DUMP_TYPE_BE or DUMP_TYPE_LE for endian conversions
> * @linebuf: where to put the converted data
> * @linebuflen: total size of @linebuf, including space for terminating NUL
> * @ascii: include ASCII after the hex output
> @@ -114,19 +115,20 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
> int j, lx = 0;
> int ascii_column;
> int ret;
> + int actual_groupsize = groupsize & ~(DUMP_TYPE_LE | DUMP_TYPE_BE);
I would rather prefer to have function parameter to be renamed.
E.g. gsflags ?
>
> if (rowsize != 16 && rowsize != 32)
> rowsize = 16;
>
> if (len > rowsize) /* limit to one line at a time */
> len = rowsize;
> - if (!is_power_of_2(groupsize) || groupsize > 8)
> - groupsize = 1;
> - if ((len % groupsize) != 0) /* no mixed size output */
> - groupsize = 1;
> + if (!is_power_of_2(actual_groupsize) || actual_groupsize > 8)
> + actual_groupsize = 1;
> + if ((len % actual_groupsize) != 0) /* no mixed size output */
> + actual_groupsize = 1;
>
> - ngroups = len / groupsize;
> - ascii_column = rowsize * 2 + rowsize / groupsize + 1;
> + ngroups = len / actual_groupsize;
> + ascii_column = rowsize * 2 + rowsize / actual_groupsize + 1;
>
> if (!linebuflen)
> goto overflow1;
> @@ -134,35 +136,56 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
> if (!len)
> goto nil;
>
> - if (groupsize == 8) {
> + if (actual_groupsize == 8) {
> const u64 *ptr8 = buf;
>
> for (j = 0; j < ngroups; j++) {
> + u64 val;
> +
> + if (groupsize & DUMP_TYPE_LE)
> + val = get_unaligned_le64(ptr8 + j);
> + else if (groupsize & DUMP_TYPE_BE)
> + val = get_unaligned_be64(ptr8 + j);
> + else
> + val = get_unaligned(ptr8 + j);
> ret = snprintf(linebuf + lx, linebuflen - lx,
> - "%s%16.16llx", j ? " " : "",
> - get_unaligned(ptr8 + j));
> + "%s%16.16llx", j ? " " : "", val);
> if (ret >= linebuflen - lx)
> goto overflow1;
> lx += ret;
> }
> - } else if (groupsize == 4) {
> + } else if (actual_groupsize == 4) {
> const u32 *ptr4 = buf;
>
> for (j = 0; j < ngroups; j++) {
> + u32 val;
> +
> + if (groupsize & DUMP_TYPE_LE)
> + val = get_unaligned_le32(ptr4 + j);
> + else if (groupsize & DUMP_TYPE_BE)
> + val = get_unaligned_be32(ptr4 + j);
> + else
> + val = get_unaligned(ptr4 + j);
> ret = snprintf(linebuf + lx, linebuflen - lx,
> - "%s%8.8x", j ? " " : "",
> - get_unaligned(ptr4 + j));
> + "%s%8.8x", j ? " " : "", val);
> if (ret >= linebuflen - lx)
> goto overflow1;
> lx += ret;
> }
> - } else if (groupsize == 2) {
> + } else if (actual_groupsize == 2) {
> const u16 *ptr2 = buf;
>
> for (j = 0; j < ngroups; j++) {
> + u16 val;
> +
> + if (groupsize & DUMP_TYPE_LE)
> + val = get_unaligned_le16(ptr2 + j);
> + else if (groupsize & DUMP_TYPE_BE)
> + val = get_unaligned_be16(ptr2 + j);
> + else
> + val = get_unaligned(ptr2 + j);
> ret = snprintf(linebuf + lx, linebuflen - lx,
> - "%s%4.4x", j ? " " : "",
> - get_unaligned(ptr2 + j));
> + "%s%4.4x", j ? " " : "", val);
> if (ret >= linebuflen - lx)
> goto overflow1;
> lx += ret;
> @@ -203,7 +226,8 @@ nil:
> overflow2:
> linebuf[lx++] = '\0';
> overflow1:
> - return ascii ? ascii_column + len : (groupsize * 2 + 1) * ngroups - 1;
> + return ascii ? ascii_column + len
> + : (actual_groupsize * 2 + 1) * ngroups - 1;
> }
> EXPORT_SYMBOL(hex_dump_to_buffer);
>
>
> --
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--
With Best Regards,
Andy Shevchenko
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