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

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Message-ID: <20250331213616.18ccfa37@gandalf.local.home>
Date: Mon, 31 Mar 2025 21:36:16 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, Masami
 Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Morton
 <akpm@...ux-foundation.org>, Vincent Donnefort <vdonnefort@...gle.com>,
 Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>, Kees
 Cook <kees@...nel.org>, Tony Luck <tony.luck@...el.com>, "Guilherme G.
 Piccoli" <gpiccoli@...lia.com>, linux-hardening@...r.kernel.org, Matthew
 Wilcox <willy@...radead.org>
Subject: Re: [PATCH v2 1/2] tracing: ring-buffer: Have the ring buffer code
 do the vmap of physical memory

On Mon, 31 Mar 2025 17:49:07 -0700
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> For example, just adding flush_dcache_range() into
> include/asm-generic/cacheflush.h should be more-or-less trivial, with
> the same kinds of "architectures can make clear they have their own
> optimized version".

Just so I'm clear. Are you suggesting to add flush_dcache_range() to
cacheflush.h and using that?

Looks like some of the code would be able to remove the ifdefs:

 #ifdef CONFIG_PPC
	flush_dcache_range(...);
 #endif

if that's the case.

-- Steve