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Message-ID: <1449689319.25389.28.camel@perches.com>
Date: Wed, 09 Dec 2015 11:28:39 -0800
From: Joe Perches <joe@...ches.com>
To: Andy Shevchenko <andy.shevchenko@...il.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>,
Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH v2] of/address: replace printk() with pr_debug() /
pr_err()
On Wed, 2015-12-09 at 14:03 +0200, Andy Shevchenko wrote:
> 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
I don't want to have to learn that code as it seems a bit tricky.
Maybe you could do it.
> > 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.
---
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,
+ 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..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
* @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);
if (ret >= linebuflen - lx)
goto overflow1;
lx += ret;
--
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