Re: [PATCH v2] of/address: replace printk() with pr_debug() / pr_err()

From: Andy Shevchenko
Date: Wed Dec 09 2015 - 15:02:31 EST

On Wed, Dec 9, 2015 at 9:28 PM, Joe Perches <joe@xxxxxxxxxxx> wrote:
> On Wed, 2015-12-09 at 14:03 +0200, Andy Shevchenko wrote:
>> On Wed, Dec 9, 2015 at 2:03 AM, Joe Perches <joe@xxxxxxxxxxx> 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@xxxxxxxxxxx> 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
>
> I don't want to have to learn that code as it seems a bit tricky.
> Maybe you could do it.

Okay, I'm fine if it at least passes existing test cases. Good to
mention this in commit message then.

>
>> > 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 ?
>>
>
> Well, it's a bit simpler changelog.

Generally I'm fine with this version, though take into account above and below.

> ---
> include/linux/printk.h | 7 +++++++
> lib/hexdump.c | 39 +++++++++++++++++++++++++++++++--------
> 2 files changed, 38 insertions(+), 8 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,

And still open this, do we need it? I think you may just mention in
the documentation that default behaviour is CPU like.

> + 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,

Here as well to change.

> bool ascii);
> diff --git a/lib/hexdump.c b/lib/hexdump.c
> index 992457b..5b1eda70 100644
> --- a/lib/hexdump.c
> +++ b/lib/hexdump.c
> @@ -80,7 +80,8 @@ EXPORT_SYMBOL(bin2hex);
> * @buf: data blob to dump
> * @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)
> + * @groupflags: number of bytes to print at a time (1, 2, 4, 8; default = 1)
> + * OR with DUMP_TYPE_BE or DUMP_TYPE_LE for endian conversions

Maybe specify "bitwise OR with.." ?

%DUMP_â

> * @linebuf: where to put the converted data
> * @linebuflen: total size of @linebuf, including space for terminating NUL
> * @ascii: include ASCII after the hex output
> @@ -105,7 +106,7 @@ EXPORT_SYMBOL(bin2hex);
> * (excluding the terminating NUL) which would have been written to the final
> * string if enough space had been available.
> */
> -int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
> +int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupflags,
> char *linebuf, size_t linebuflen, bool ascii)
> {
> const u8 *ptr = buf;
> @@ -114,6 +115,7 @@ 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 groupsize = groupflags & ~(DUMP_TYPE_LE | DUMP_TYPE_BE);
>
> if (rowsize != 16 && rowsize != 32)
> rowsize = 16;
> @@ -138,9 +140,16 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
> const u64 *ptr8 = buf;
>
> for (j = 0; j < ngroups; j++) {
> + u64 val;
> +
> + if (groupflags & DUMP_TYPE_LE)
> + val = get_unaligned_le64(ptr8 + j);
> + else if (groupflags & 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;
> @@ -149,9 +158,16 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
> const u32 *ptr4 = buf;
>
> for (j = 0; j < ngroups; j++) {
> + u32 val;
> +
> + if (groupflags & DUMP_TYPE_LE)
> + val = get_unaligned_le32(ptr4 + j);
> + else if (groupflags & 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;
> @@ -160,9 +176,16 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
> const u16 *ptr2 = buf;
>
> for (j = 0; j < ngroups; j++) {
> + u16 val;
> +
> + if (groupflags & DUMP_TYPE_LE)
> + val = get_unaligned_le16(ptr2 + j);
> + else if (groupflags & 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);



--
With Best Regards,
Andy Shevchenko
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