Re: [PATCH 0/2] rcu: Transform kfree_rcu() into kvfree_rcu()

[Steven Rostedt]

On Wed, 7 Feb 2018 10:47:02 -0600 (CST)
Christopher Lameter <cl@xxxxxxxxx> wrote:

> On Tue, 6 Feb 2018, Matthew Wilcox wrote:
> 
> > Personally, I would like us to rename kvfree() to just free(), and have
> > malloc(x) be an alias to kvmalloc(x, GFP_KERNEL), but I haven't won that
> > fight yet.  
> 
> Maybe lets implement malloc(), free() and realloc() in the kernel to be
> consistent with user space use as possible? Only use the others
> allocation variants for special cases.

They would need to drop the GFP part and default to GFP_KERNEL.

> 
> So malloc would check allocation sizes and if < 2* PAGE_SIZE use kmalloc()
> otherwise vmalloc().

Please no, I hate subtle internal decisions like this. It makes
debugging much more difficult, when allocating dynamic sized variables.
When something works at one size but not the other.

-- Steve

> 
> free() would free anything you give it.