linux-kernel - Re: [PATCH v4 01/13] scripts/gdb: Add infrastructure

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Date:	Wed, 23 Jan 2013 12:41:57 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Jan Kiszka <jan.kiszka@...mens.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net,
	Andi Kleen <andi@...stfloor.org>,
	Tom Tromey <tromey@...hat.com>,
	Ben Widawsky <ben@...dawsk.net>, Michal Marek <mmarek@...e.cz>,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH v4 01/13] scripts/gdb: Add infrastructure

On Mon, Jan 21, 2013 at 06:06:08PM +0100, Jan Kiszka wrote:
> This provides the basic infrastructure to load kernel-specific python
> helper scripts when debugging the kernel in gdb.
> 
> The loading mechanism is based on gdb loading for <objfile>-gdb.py when
> opening <objfile>. Therefore, this places a corresponding link to the
> main helper script into the output directory that contains vmlinux.
> 
> The main scripts will pull in submodules containing Linux specific gdb
> commands and functions. To avoid polluting the source directory with
> compiled python modules, we link to them from the object directory.
> 
> Due to gdb.parse_and_eval, we depend on gdb >= 7.1. We need to
> pre-process the version string returned by gdb as some distros tend to
> prefix it with their name.
> 
> This feature depends on CONFIG_DEBUG_INFO.
> 
> CC: Michal Marek <mmarek@...e.cz>
> CC: linux-kbuild@...r.kernel.org
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> ---
>  Makefile                   |    5 ++++-
>  scripts/Makefile           |    3 ++-
>  scripts/gdb/Makefile       |    9 +++++++++
>  scripts/gdb/utils.py       |   17 +++++++++++++++++
>  scripts/gdb/vmlinux-gdb.py |   22 ++++++++++++++++++++++
>  5 files changed, 54 insertions(+), 2 deletions(-)
>  create mode 100644 scripts/gdb/Makefile
>  create mode 100644 scripts/gdb/utils.py
>  create mode 100644 scripts/gdb/vmlinux-gdb.py
> 
> diff --git a/Makefile b/Makefile
> index 253a455..fb18794 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -774,6 +774,9 @@ endif
>  ifdef CONFIG_BUILD_DOCSRC
>  	$(Q)$(MAKE) $(build)=Documentation
>  endif
> +ifdef CONFIG_DEBUG_INFO
> +	$(Q)ln -fsn $(srctree)/scripts/gdb/vmlinux-gdb.py
> +endif

I'm wondering whether it won't be a better idea to make this symlink
creation in the toplevel directory only when a user requires it.. I.e.,
not simply when CONFIG_DEBUG_INFO is enabled (it could be enabled for a
lot and different reasons) but only when user wants to really debug the
kernel with gdb.

Then, having a specific make target could arrange for all the setup like
the symlink, gdb version checking, etc, maybe something like this:

$ make gdb

and all is prepared (or errored out with a sensible message).

Hmm....

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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