RE: [PATCH] cputime: Fix timeval-->cputime conversion

[Thomas Gleixner]

On Mon, 1 Feb 2016, Zengtao (B) wrote:

> Hi Arnd:
> 	I have got a new idea about the problem: 
> In include/linux/time64.h
> #define NSEC_PER_SEC	1000000000L 
> I think we should change it to
> #define NSEC_PER_SEC	1000000000LL 
> 
> My reason is :
> 1.  when it is used in a multiplication, it will easily get overflow.
> 2.  when it don't get overflow, the change has no side affect.

That's not a good idea. NSEC_PER_SEC is used in lots of places with 32bit
storage. I really don't want to mop up all the fallout.

Thanks,

	tglx