linux-kernel - kdb: kgdb: CONFIG_DEBUG

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Message-ID: <CA+icZUUkEgv+e1q3v1kW5WhJdT1egZKc5o96zF2omcT0YtVE3w@mail.gmail.com>
Date:	Tue, 9 Apr 2013 15:06:39 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	kgdb-bugreport@...ts.sourceforge.net,
	LKML <linux-kernel@...r.kernel.org>
Subject: kdb: kgdb: CONFIG_DEBUG_RODATA setting?

>From [1]:

"If the architecture that you are using supports the kernel option
CONFIG_DEBUG_RODATA, you should consider turning it off. This option
will prevent the use of software breakpoints because it marks certain
regions of the kernel's memory space as read-only. If kgdb supports it
for the architecture you are using, you can use hardware breakpoints
if you desire to run with the CONFIG_DEBUG_RODATA option turned on,
else you need to turn off this option."

"Here is an example set of .config symbols to enable or disable for kgdb:

    # CONFIG_DEBUG_RODATA is not set

    CONFIG_FRAME_POINTER=y

    CONFIG_KGDB=y

    CONFIG_KGDB_SERIAL_CONSOLE=y
".

I am here on x86-64 and CONFIG_DEBUG_RODATA is always "=y" in
Linux-Next due to...

[ arch/x86/Kconfig.debug ]

 config DEBUG_RODATA
        bool "Write protect kernel read-only data structures"
       default y
        depends on DEBUG_KERNEL

So, is this setting now obsolete (means [1] not up2date?).
( See also my patch. )

Kind Regards,
- Sedat -

[1] https://www.kernel.org/pub/linux/kernel/people/jwessel/kdb/CompilingAKernel.html#CompileKGDB

Download attachment "0001-kdb-kgdb-x86-Unset-DEBUG_RODATA-when-KGDB.patch" of type "application/octet-stream" (1404 bytes)

Download attachment "config-3.9.0-rc6-next20130409-1-iniza-small" of type "application/octet-stream" (112103 bytes)