* Suresh Siddha <[email protected]> wrote:
> Currently stop machine infrastructure can be called only from a cpu that is
> online. But for !CONFIG_SMP, we do allow calling __stop_machine() before the
> cpu is online.
>
> x86 for example requires stop machine infrastructure in the cpu online path
> and currently implements its own stop machine (using stop_one_cpu_nowait())
> for MTRR initialization in the cpu online path.
>
> Enhance the __stop_machine() so that it can be called before the cpu
> is onlined. This will pave the way for code consolidation and address
> potential
> deadlocks caused by multiple mechanisms of doing system wide rendezvous.
>
> This will also address the behavioral differences of __stop_machine()
> between SMP and UP builds.
>
> Signed-off-by: Suresh Siddha <[email protected]>
> Cc: [email protected] # v2.6.35+
> ---
> include/linux/stop_machine.h | 11 +++--
> kernel/stop_machine.c | 91
> ++++++++++++++++++++++++++++++++++++++++---
> 2 files changed, 93 insertions(+), 9 deletions(-)
Btw., this is *way* too risky for a -stable backport.
Thanks,
Ingo
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