On Mon, Jun 29, 2015 at 12:33:40PM -0700, Andy Lutomirski wrote:
> Changing the x86 context tracking hooks is dangerous because there
> are no good checks that we track our context correctly. Add a
> helper to check that we're actually in CONTEXT_USER when we enter
> from user mode and wire it up for syscall entries.
>
> Subsequent patches will wire this up for all non-NMI entries as
> well. NMIs are their own special beast and cannot currently switch
> overall context tracking state. Instead, they have their own
> special RCU hooks.
>
> This is a tiny speedup if !CONFIG_CONTEXT_TRACKING (removes a
> branch) and a tiny slowdown if CONFIG_CONTEXT_TRACING (adds a layer
CONTEXT_TRACING?!
Oh noooo, not another tracer :-P
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
--
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
