Re: [PATCH] MIPS: tracing: Optimize the implementation

[David Daney <ddaney@caviumnetworks.com>]

On 03/12/2010 12:50 AM, Thomas Bogendoerfer wrote:
> On Fri, Mar 12, 2010 at 02:07:37AM +0800, Wu Zhangjin wrote:
> > +/*
> > + * If the Instruction Pointer is in module space (0xc0000000), return ture;
> > + * otherwise, it is in kernel space (0x80000000), return false.
> > + */
> > +#define in_module(ip) (unlikely((ip)&  0x40000000))
> > +
> looks broken for 64bit, but maybe this is a 32bit only feature...
I initially thought the same thing.  However for 64-bit kernels linked 
in ckseg0 it is still true.  If we use the -msym32 optimization, we are 
forced to be in the ckseg space, so for most cases it works.
David Daney.