linux-toradex.git/include/linux/getcpu.h, branch tegra-10.9.9 Linux kernel for Apalis and Colibri modules [PATCH] Define vsyscall cache as blob to make clearer that user space shouldn't use it 2006-09-29T23:47:55+00:00 Andi Kleen ak@suse.de 2006-09-29T23:47:55+00:00 34596dc9e59d7bece16fe5aba08116b49465da26 Signed-off-by: Andi Kleen <ak@suse.de> 
Signed-off-by: Andi Kleen <ak@suse.de>
[PATCH] Add the vgetcpu vsyscall 2006-09-26T08:52:28+00:00 Vojtech Pavlik vojtech@suse.cz 2006-09-26T08:52:28+00:00 c08c820508233b424deab3302bc404bbecc6493a This patch adds a vgetcpu vsyscall, which depending on the CPU RDTSCP capability uses either the RDTSCP or CPUID to obtain a CPU and node numbers and pass them to the program. AK: Lots of changes over Vojtech's original code: Better prototype for vgetcpu() It's better to pass the cpu / node numbers as separate arguments to avoid mistakes when going from SMP to NUMA. Also add a fast time stamp based cache using a user supplied argument to speed things more up. Use fast method from Chuck Ebbert to retrieve node/cpu from GDT limit instead of CPUID Made sure RDTSCP init is always executed after node is known. Drop printk Signed-off-by: Vojtech Pavlik <vojtech@suse.cz> Signed-off-by: Andi Kleen <ak@suse.de> 
This patch adds a vgetcpu vsyscall, which depending on the CPU RDTSCP
capability uses either the RDTSCP or CPUID to obtain a CPU and node
numbers and pass them to the program.

AK: Lots of changes over Vojtech's original code:
Better prototype for vgetcpu()
It's better to pass the cpu / node numbers as separate arguments
to avoid mistakes when going from SMP to NUMA.
Also add a fast time stamp based cache using a user supplied
argument to speed things more up.
Use fast method from Chuck Ebbert to retrieve node/cpu from
GDT limit instead of CPUID
Made sure RDTSCP init is always executed after node is known.
Drop printk

Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Andi Kleen <ak@suse.de>