Re: [PATCH tip:x86/mm 1/3] x86: A fast way to check capabilities of the current cpu

From: Andi Kleen
Date: Mon Mar 14 2011 - 15:50:21 EST

Next message: KY Srinivasan: "RE: [PATCH 10/21] Staging: hv: Cleanup root device handling"
Previous message: Dan Rosenberg: "Re: [PATCH] Restrict write access to dmesg_restrict"
In reply to: Tejun Heo: "[PATCH tip:x86/mm 3/3] acpi throttling: Use this_cpu_has andsimplify code current cpu"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Tejun Heo <tj@xxxxxxxxxx> writes:

> Add this_cpu_has() which determines if the current cpu has a certain
> ability using a segment prefix and a bit test operation.

Hmm: if the CPU capability is really tested in a performance critical
path, wouldn't it even be better to just use static_branch() now?

-Andi

--
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

Next message: KY Srinivasan: "RE: [PATCH 10/21] Staging: hv: Cleanup root device handling"
Previous message: Dan Rosenberg: "Re: [PATCH] Restrict write access to dmesg_restrict"
In reply to: Tejun Heo: "[PATCH tip:x86/mm 3/3] acpi throttling: Use this_cpu_has andsimplify code current cpu"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]