[PATCH v2] arch/cacheflush: Introduce flush_all_caches()

[Christoph Hellwig]

On Fri, Aug 19, 2022 at 10:10:24AM -0700, Davidlohr Bueso wrote:
> index b192d917a6d0..ac4d4fd4e508 100644
> --- a/arch/x86/include/asm/cacheflush.h
> +++ b/arch/x86/include/asm/cacheflush.h
> @@ -10,4 +10,8 @@
>  
>  void clflush_cache_range(void *addr, unsigned int size);
>  
> +/* see comments in the stub version */
> +#define flush_all_caches() \
> +	do { wbinvd_on_all_cpus(); } while(0)

Yikes.  This is just a horrible, horrible name and placement for a bad
hack that should have no generic relevance.

Please fix up the naming to make it clear that this function is for a
very specific nvdimm use case, and move it to a nvdimm-specific header
file.