Re: [PATCH v2 1/2] tracing: ring-buffer: Have the ring buffer code do the vmap of physical memory

[Steven Rostedt]

On Thu, 3 Apr 2025 09:51:51 -0700
Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:

> I *suspect* the history is simply that 'vmap()' predates 'vmap_page_range()'.
> 

Doing some git archeology, it appears vmap_page_range() was added last
year, to replace some ioremap_page_range() use cases, by Alexei.

In 2021, Christoph moved ioremap_page_range() to vmalloc.c replacing
vmap_range().

Also in 2021, Nick changed the ioremap_*range to vmap_*_range(), basically
making this full circle.

The ioremap_page_range() was introduced in 2006.

vmap() looks to have been there before you started git.

The vmap() usage in pstore was introduced in 2012.

-- Steve