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dynamic_debug: dynamic hex dump

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Introduce print_hex_dump_debug() that can be dynamically controlled, similar to
pr_debug.

Also, make print_hex_dump_bytes() dynamically controlled

Implement only 'p' flag (_DPRINTK_FLAGS_PRINT) to keep it simple since hex dump prints
multiple lines and long prefix would impact readability.
To provide line/file etc. information, use pr_debug or similar
before/after print_hex_dump_debug()

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vladimir Kondratiev
2012-12-05 16:48:27 -05:00
committed by Greg Kroah-Hartman
parent f657fd21e1
commit 7a555613eb
4 changed files with 44 additions and 3 deletions
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Documentation/dynamic-debug-howto.txt
+13 -2
View File
@@ -6,8 +6,16 @@ This document describes how to use the dynamic debug (dyndbg) feature.
Dynamic debug is designed to allow you to dynamically enable/disable
kernel code to obtain additional kernel information. Currently, if
CONFIG_DYNAMIC_DEBUG is set, then all pr_debug()/dev_dbg() calls can
be dynamically enabled per-callsite.
CONFIG_DYNAMIC_DEBUG is set, then all pr_debug()/dev_dbg() and
print_hex_dump_debug()/print_hex_dump_bytes() calls can be dynamically
enabled per-callsite.
If CONFIG_DYNAMIC_DEBUG is not set, print_hex_dump_debug() is just
shortcut for print_hex_dump(KERN_DEBUG).
For print_hex_dump_debug()/print_hex_dump_bytes(), format string is
its 'prefix_str' argument, if it is constant string; or "hexdump"
in case 'prefix_str' is build dynamically.
Dynamic debug has even more useful features:
@@ -202,6 +210,9 @@ The flags are:
t Include thread ID in messages not generated from interrupt context
_ No flags are set. (Or'd with others on input)
For print_hex_dump_debug() and print_hex_dump_bytes(), only 'p' flag
have meaning, other flags ignored.
For display, the flags are preceded by '='
(mnemonic: what the flags are currently equal to).