Re: [PATCH v2 0/2] Replace and improve "mcsafe" with copy_safe()

[Luck, Tony]

On Thu, Apr 30, 2020 at 11:42:20AM -0700, Andy Lutomirski wrote:
> I suppose there could be a consistent naming like this:
> 
> copy_from_user()
> copy_to_user()
> 
> copy_from_unchecked_kernel_address() [what probe_kernel_read() is]
> copy_to_unchecked_kernel_address() [what probe_kernel_write() is]
> 
> copy_from_fallible() [from a kernel address that can fail to a kernel
> address that can't fail]
> copy_to_fallible() [the opposite, but hopefully identical to memcpy() on x86]
> 
> copy_from_fallible_to_user()
> copy_from_user_to_fallible()
> 
> These names are fairly verbose and could probably be improved.

How about

	try_copy_catch(void *dst, void *src, size_t count, int *fault)

returns number of bytes not-copied (like copy_to_user etc).

if return is not zero, "fault" tells you what type of fault
cause the early stop (#PF, #MC).

-Tony