Re: [Kgdb-bugreport] 2.6.23-rc3-mm1: kgdb build failure on powerpc

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Pete/Piet Delaney wrote:
Jason Wessel wrote:
Andrew Morton wrote:
On Wed, 22 Aug 2007 17:44:12 -0500
Jason Wessel <jason.wessel@xxxxxxxxxxxxx> wrote:


+ while (!atomic_read(&debugger_active));

eek. We're in the process of hunting down and eliminating exactly this
construct. There have been cases where the compiler cached the
atomic_read() result in a register, turning the above into an infinite
loop.

Plus we should never add power-burners like that into the kernel
anyway. That loop should have a cpu_relax() in it. Which will also
fix the
compiler problem described above.


Agreed, and fixed with a cpu_relax.

Thirdly, please always add a newline when coding statements like that:

while (expr())
;

The other instances I found of the same problem in the kgdb core are
fixed too.

I merged all the changes into the for_mm branch in the kgdb git tree.

Where is the kgdb git tree?

Why am I getting this when I do:

git clone
http://master.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb.git

-
----------------------------------------------------------------------------
error: Couldn't get
http://master.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb.git/refs/tags/v2.6.11
for tags/v2.6.11
The requested URL returned error: 404
error: Could not interpret tags/v2.6.11 as something to pull
rm: cannot remove directory
`/nethome/piet/Src/linux/git/jwessel/linux-2.6-kgdb/.git/clone-tmp':
Directory not empty
/nethome/piet/Src/linux/git/jwessel$
-
----------------------------------------------------------------------------

We are getting a problem with VMware where kernel text is the schedler
is getting wacked with four null bytes into the code. Thought I'd use
the current linux-2.6-kgdb.git tree and possible the CONFIG_DEBUG_RODATA
patch to make kernel text readonly:

https://www.x86-64.org/pipermail/patches/2007-March/003666.html

I thought the kernel text was RO and gdb had to disable it to
insert a breakpoint.

- -piet


-piet

Thanks,
Jason.
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