[1/4] powerpc/tm: Add commandline option to disable hardware transactional memory

[Michael Ellerman]

On Thu, 2017-10-12 at 10:17:16 UTC, Michael Ellerman wrote:
> From: Cyril Bur <cyrilbur at gmail.com>
> 
> Currently the kernel relies on firmware to inform it whether or not the
> CPU supports HTM and as long as the kernel was built with
> CONFIG_PPC_TRANSACTIONAL_MEM=y then it will allow userspace to make
> use of the facility.
> 
> There may be situations where it would be advantageous for the kernel
> to not allow userspace to use HTM, currently the only way to achieve
> this is to recompile the kernel with CONFIG_PPC_TRANSACTIONAL_MEM=n.
> 
> This patch adds a simple commandline option so that HTM can be
> disabled at boot time.
> 
> Signed-off-by: Cyril Bur <cyrilbur at gmail.com>
> [mpe: Simplify to a bool, move to prom.c, put doco in the right place.
>  Always disable, regardless of initial state, to avoid user confusion.]
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>

Series applied to powerpc next.

https://git.kernel.org/powerpc/c/07fd1761e1cd2b5ecdb470fc228d52

cheers