On Mon, 2017-12-18 at 14:28 -0800, Dave Hansen wrote:
We do not have generic support for something like that on ppc. The kernel looks at the device tree to determine what hardware features are available. But does not have mechanism to tell the hardware to track which of its features are currently enabled/used by the kernel; atleast not for the memory-key feature.
Bummer. You're missing out.
But, you could still do this with a syscall. "Hey, kernel, do you support this feature?"
I'm not sure I understand Ram's original (quoted) point, but informing userspace of CPU features is what AT_HWCAP's are about.
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