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Message-ID: <CAHk-=wgLLOmocrOw2uH9QxsV=SK236gv0Df8SWXGS8c8LAiyCA@mail.gmail.com> Date: Thu, 11 Apr 2019 15:34:33 -0700 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Benjamin Herrenschmidt <benh@...nel.crashing.org> Cc: Will Deacon <will.deacon@....com>, linux-arch <linux-arch@...r.kernel.org>, Linux List Kernel Mailing <linux-kernel@...r.kernel.org>, "Paul E. McKenney" <paulmck@...ux.ibm.com>, Michael Ellerman <mpe@...erman.id.au>, Arnd Bergmann <arnd@...db.de>, Peter Zijlstra <peterz@...radead.org>, Andrea Parri <andrea.parri@...rulasolutions.com>, Palmer Dabbelt <palmer@...ive.com>, Daniel Lustig <dlustig@...dia.com>, David Howells <dhowells@...hat.com>, Alan Stern <stern@...land.harvard.edu>, "Maciej W. Rozycki" <macro@...ux-mips.org>, Paul Burton <paul.burton@...s.com>, Ingo Molnar <mingo@...nel.org>, Yoshinori Sato <ysato@...rs.sourceforge.jp>, Rich Felker <dalias@...c.org>, Tony Luck <tony.luck@...el.com>, Mikulas Patocka <mpatocka@...hat.com>, Akira Yokosawa <akiyks@...il.com>, Luis Chamberlain <mcgrof@...nel.org>, Nicholas Piggin <npiggin@...il.com> Subject: Re: [PATCH v2 01/21] docs/memory-barriers.txt: Rewrite "KERNEL I/O BARRIER EFFECTS" section On Thu, Apr 11, 2019 at 3:13 PM Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote: > > Minor nit... I would have said "All readX() and writeX() accesses _from > the same CPU_ to the same peripheral... and then s/the CPU/this CPU. Maybe talk about "same thread" rather than "same cpu", with the understanding that scheduling/preemption has to include the appropriate cross-CPU IO barrier? Linus
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