Andrew Morton wrote:
On Wed, 22 Aug 2007 17:44:12 -0500
Jason Wessel <[email protected]> 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.
Thanks,
Jason.
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