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Date: Sat, 16 Jan 2021 16:09:49 -0600
From: Timur Tabi <timur@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
Petr Mladek <pmladek@...e.com>, roman.fietze@...na.com,
keescook@...omium.org, Steven Rostedt <rostedt@...dmis.org>,
John Ogness <john.ogness@...utronix.de>, linux-mm@...ck.org,
Akinobu Mita <akinobu.mita@...il.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Vaibhav Jain <vaibhav@...ux.ibm.com>,
Dan Williams <dan.j.williams@...el.com>,
linux-fsdevel@...r.kernel.org
Subject: [PATCH 1/2] [v2] lib/hexdump: introduce DUMP_PREFIX_UNHASHED for unhashed addresses
Hashed addresses are useless in hexdumps unless you're comparing
with other hashed addresses, which is unlikely. However, there's
no need to break existing code, so introduce a new prefix type
that prints unhashed addresses.
Signed-off-by: Timur Tabi <timur@...nel.org>
Reviewed-by: Petr Mladek <pmladek@...e.com>
Cc: Roman Fietze <roman.fietze@...na.com>
---
fs/seq_file.c | 3 +++
include/linux/printk.h | 8 +++++---
lib/hexdump.c | 9 +++++++--
lib/seq_buf.c | 9 +++++++--
4 files changed, 22 insertions(+), 7 deletions(-)
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 03a369ccd28c..b5b49a855894 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -864,6 +864,9 @@ void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
remaining -= rowsize;
switch (prefix_type) {
+ case DUMP_PREFIX_UNHASHED:
+ seq_printf(m, "%s%px: ", prefix_str, ptr + i);
+ break;
case DUMP_PREFIX_ADDRESS:
seq_printf(m, "%s%p: ", prefix_str, ptr + i);
break;
diff --git a/include/linux/printk.h b/include/linux/printk.h
index fe7eb2351610..d3c08095a9a3 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -567,7 +567,8 @@ extern const struct file_operations kmsg_fops;
enum {
DUMP_PREFIX_NONE,
DUMP_PREFIX_ADDRESS,
- DUMP_PREFIX_OFFSET
+ DUMP_PREFIX_OFFSET,
+ DUMP_PREFIX_UNHASHED,
};
extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
int groupsize, char *linebuf, size_t linebuflen,
@@ -612,8 +613,9 @@ static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
* print_hex_dump_bytes - shorthand form of print_hex_dump() with default params
* @prefix_str: string to prefix each line with;
* caller supplies trailing spaces for alignment if desired
- * @prefix_type: controls whether prefix of an offset, address, or none
- * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
+ * @prefix_type: controls whether prefix of an offset, hashed address,
+ * unhashed address, or none is printed (%DUMP_PREFIX_OFFSET,
+ * %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_UNHASHED, %DUMP_PREFIX_NONE)
* @buf: data blob to dump
* @len: number of bytes in the @buf
*
diff --git a/lib/hexdump.c b/lib/hexdump.c
index 9301578f98e8..b5acfc4168a8 100644
--- a/lib/hexdump.c
+++ b/lib/hexdump.c
@@ -211,8 +211,9 @@ EXPORT_SYMBOL(hex_dump_to_buffer);
* @level: kernel log level (e.g. KERN_DEBUG)
* @prefix_str: string to prefix each line with;
* caller supplies trailing spaces for alignment if desired
- * @prefix_type: controls whether prefix of an offset, address, or none
- * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
+ * @prefix_type: controls whether prefix of an offset, hashed address,
+ * unhashed address, or none is printed (%DUMP_PREFIX_OFFSET,
+ * %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_UNHASHED, %DUMP_PREFIX_NONE)
* @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)
* @buf: data blob to dump
@@ -256,6 +257,10 @@ void print_hex_dump(const char *level, const char *prefix_str, int prefix_type,
linebuf, sizeof(linebuf), ascii);
switch (prefix_type) {
+ case DUMP_PREFIX_UNHASHED:
+ printk("%s%s%px: %s\n",
+ level, prefix_str, ptr + i, linebuf);
+ break;
case DUMP_PREFIX_ADDRESS:
printk("%s%s%p: %s\n",
level, prefix_str, ptr + i, linebuf);
diff --git a/lib/seq_buf.c b/lib/seq_buf.c
index 707453f5d58e..017c4d7e93f1 100644
--- a/lib/seq_buf.c
+++ b/lib/seq_buf.c
@@ -335,8 +335,9 @@ int seq_buf_to_user(struct seq_buf *s, char __user *ubuf, int cnt)
* @s: seq_buf descriptor
* @prefix_str: string to prefix each line with;
* caller supplies trailing spaces for alignment if desired
- * @prefix_type: controls whether prefix of an offset, address, or none
- * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
+ * @prefix_type: controls whether prefix of an offset, hashed address,
+ * unhashed address, or none is printed (%DUMP_PREFIX_OFFSET,
+ * %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_UNHASHED, %DUMP_PREFIX_NONE)
* @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)
* @buf: data blob to dump
@@ -374,6 +375,10 @@ int seq_buf_hex_dump(struct seq_buf *s, const char *prefix_str, int prefix_type,
linebuf, sizeof(linebuf), ascii);
switch (prefix_type) {
+ case DUMP_PREFIX_UNHASHED:
+ ret = seq_buf_printf(s, "%s%px: %s\n",
+ prefix_str, ptr + i, linebuf);
+ break;
case DUMP_PREFIX_ADDRESS:
ret = seq_buf_printf(s, "%s%p: %s\n",
prefix_str, ptr + i, linebuf);
--
2.25.1
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