From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Tadeusz Struk <tadeusz.struk@intel.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
Mauro Carvalho Chehab <m.chehab@samsung.com>,
Helge Deller <deller@gmx.de>,
Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com>,
linux-kernel@vger.kernel.org, Joe Perches <joe@perches.com>,
Marek Vasut <marex@denx.de>
Subject: Re: [PATCH v3 1/5] seq_file: provide an analogue of print_hex_dump()
Date: Mon, 01 Sep 2014 11:36:46 +0300 [thread overview]
Message-ID: <1409560606.30155.41.camel@linux.intel.com> (raw)
In-Reply-To: <20140830225407.GF7996@ZenIV.linux.org.uk>
On Sat, 2014-08-30 at 23:54 +0100, Al Viro wrote:
> On Mon, Aug 25, 2014 at 12:03:11PM +0300, Andy Shevchenko wrote:
> > The new seq_hex_dump() is a complete analogue of print_hex_dump().
> >
> > We have few users of this functionality already. It allows to reduce their
> > codebase.
>
> I really don't like the stack footprint.
>
> > + unsigned char linebuf[32 * 3 + 2 + 32 + 1];
>
> ... and extra copying for no good reason. Why not check that we have
> enough space in buffer and generate directly into it? See what e.g.
> seq_escape() is doing...
What about this variant?
@@ -794,6 +795,47 @@ void seq_pad(struct seq_file *m, char c)
}
EXPORT_SYMBOL(seq_pad);
+/* Analogue of print_hex_dump() */
+void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
+ int rowsize, int groupsize, const void *buf, size_t len,
+ bool ascii)
+{
+ const u8 *ptr = buf;
+ int i, linelen, remaining = len;
+ int ret;
+
+ if (rowsize != 16 && rowsize != 32)
+ rowsize = 16;
+
+ for (i = 0; i < len; i += rowsize) {
+ linelen = min(remaining, rowsize);
+ remaining -= rowsize;
+
+ ret = seq_printf(m, "%s", prefix_str);
+ if (ret < 0)
+ break;
+
+ if (prefix_type == DUMP_PREFIX_ADDRESS)
+ ret = seq_printf(m, "%p: ", ptr + i);
+ else if (prefix_type == DUMP_PREFIX_OFFSET)
+ ret = seq_printf(m, "%.8x: ", i);
+ if (ret < 0)
+ break;
+
+ if (m->size < m->count + groupsize * 2 + 1)
+ break;
+
+ hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
+ m->buf + m->count, m->size - m->count,
+ ascii);
+
+ ret = seq_putc(m, '\n');
+ if (ret < 0)
+ break;
+ }
+}
+EXPORT_SYMBOL(seq_hex_dump);
--
Andy Shevchenko <andriy.shevchenko@intel.com>
Intel Finland Oy
next prev parent reply other threads:[~2014-09-01 8:37 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-25 9:03 [PATCH v3 0/5] fs/seq_file: introduce seq_hex_dump() helper Andy Shevchenko
2014-08-25 9:03 ` [PATCH v3 1/5] seq_file: provide an analogue of print_hex_dump() Andy Shevchenko
2014-08-30 22:54 ` Al Viro
2014-09-01 8:36 ` Andy Shevchenko [this message]
2014-09-01 8:58 ` Geert Uytterhoeven
2014-09-01 9:09 ` Andy Shevchenko
2014-09-01 9:25 ` Geert Uytterhoeven
2014-09-01 10:15 ` Andy Shevchenko
2014-09-01 10:59 ` Geert Uytterhoeven
2014-09-01 11:33 ` Andy Shevchenko
2014-09-01 11:49 ` Geert Uytterhoeven
2014-09-01 11:53 ` Andy Shevchenko
2014-08-25 9:03 ` [PATCH v3 2/5] saa7164: convert to seq_hex_dump() Andy Shevchenko
2014-08-25 9:03 ` [PATCH v3 3/5] crypto: qat - use seq_hex_dump() to dump buffers Andy Shevchenko
2014-08-25 9:03 ` [PATCH v3 4/5] parisc: " Andy Shevchenko
2014-08-26 19:36 ` Helge Deller
2014-08-25 9:03 ` [PATCH v3 5/5] [S390] zcrypt: " Andy Shevchenko
2014-08-27 13:26 ` Ingo Tuchscherer
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