linux-kernel - Re: [PATCH v2] arch/cacheflush: Introduce flush_all

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Date:   Sun, 21 Aug 2022 23:38:08 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Davidlohr Bueso <dave@...olabs.net>
Cc:     linux-arch@...r.kernel.org, dan.j.williams@...el.com,
        peterz@...radead.org, mark.rutland@....com, dave.jiang@...el.com,
        Jonathan.Cameron@...wei.com, a.manzanares@...sung.com,
        bwidawsk@...nel.org, alison.schofield@...el.com,
        ira.weiny@...el.com, linux-cxl@...r.kernel.org,
        nvdimm@...ts.linux.dev, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arch/cacheflush: Introduce flush_all_caches()

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.