Re: [PATCH v11 3/8] powerpc/perf: consolidate read_user_stack_32

[Michal Suchánek]

On Fri, Apr 03, 2020 at 09:26:27PM +1000, Nicholas Piggin wrote:
> Michal Suchánek's on April 3, 2020 8:52 pm:
> > Hello,
> > 
> > there are 3 variants of the function
> > 
> > read_user_stack_64
> > 
> > 32bit read_user_stack_32
> > 64bit read_user_Stack_32
> 
> Right.
> 
> > On Fri, Apr 03, 2020 at 05:13:25PM +1000, Nicholas Piggin wrote:
> [...]
> >>  #endif /* CONFIG_PPC64 */
> >>  
> >> +static int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret)
> >> +{
> >> +	return __read_user_stack(ptr, ret, sizeof(*ret));
> > Does not work for 64bit read_user_stack_32 ^ this should be 4.
> > 
> > Other than that it should preserve the existing logic just fine.
> 
> sizeof(int) == 4 on 64bit so it should work.
> 
Right, the type is different for the 32bit and 64bit version.

Thanks

Michal