Re: [PATCH 1/1] fs: strncmp() for user space buffers

[Amber Thrall <amber@thrall.me>]

On 02/28, Al Viro wrote:
> On Sun, Feb 28, 2016 at 02:50:22PM -0800, Amber Thrall wrote:
> > The simple_strncmp_to_buffer() function provides an easier method for
> > developers to compare a kernel space buffer against user space data. This
> > process is done in a few drivers and may be simplified to a single function.
> 
> *blink*
> 
> The name is rather confusing and I would say that semantics is unexpected
> as well.  I would like to see proposed users of that primitive...

Apologies for the confusing name, struggled to find an appropriate name
while staying consistent with the naming schemes of
simple_read/write_to_buffer() functions, as it based off of them. I'd
love to hear alternative names.

I saw possible uses for this proposed function being an easy way to
interact with debugfs, via their write file operation. For
example in the function xenvif_write_io_ring() the string "kick" is
checked for against a user space buffer.

Thanks for the fast reply.