From: "Andy Lutomirski" <luto@kernel.org>
To: "Nicholas Piggin" <npiggin@gmail.com>,
"the arch/x86 maintainers" <x86@kernel.org>
Cc: "Andrew Morton" <akpm@linux-foundation.org>,
"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Dave Hansen" <dave.hansen@intel.com>,
linux-arm-kernel@lists.infradead.org,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Michael Ellerman" <mpe@ellerman.id.au>,
"Paul Mackerras" <paulus@samba.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
stable@vger.kernel.org, "Will Deacon" <will@kernel.org>
Subject: Re: [PATCH 8/8] membarrier: Rewrite sync_core_before_usermode() and improve documentation
Date: Wed, 16 Jun 2021 16:48:54 -0700 [thread overview]
Message-ID: <57dae79c-fff8-411f-a375-1aa8a1cd10ac@www.fastmail.com> (raw)
In-Reply-To: <1e248763-9372-6e4e-5dea-cda999000aeb@kernel.org>
On Wed, Jun 16, 2021, at 11:52 AM, Andy Lutomirski wrote:
> On 6/15/21 9:45 PM, Nicholas Piggin wrote:
> > Excerpts from Andy Lutomirski's message of June 16, 2021 1:21 pm:
> >> The old sync_core_before_usermode() comments suggested that a non-icache-syncing
> >> return-to-usermode instruction is x86-specific and that all other
> >> architectures automatically notice cross-modified code on return to
> >> userspace.
>
> >> +/*
> >> + * XXX: can a powerpc person put an appropriate comment here?
> >> + */
> >> +static inline void membarrier_sync_core_before_usermode(void)
> >> +{
> >> +}
> >> +
> >> +#endif /* _ASM_POWERPC_SYNC_CORE_H */
> >
> > powerpc's can just go in asm/membarrier.h
>
> $ ls arch/powerpc/include/asm/membarrier.h
> ls: cannot access 'arch/powerpc/include/asm/membarrier.h': No such file
> or directory
Which is because I deleted it. Duh. I'll clean this up.
>
>
> >
> > /*
> > * The RFI family of instructions are context synchronising, and
> > * that is how we return to userspace, so nothing is required here.
> > */
>
> Thanks!
>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-06-16 23:51 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1623813516.git.luto@kernel.org>
2021-06-16 3:21 ` [PATCH 7/8] membarrier: Remove arm (32) support for SYNC_CORE Andy Lutomirski
2021-06-16 9:28 ` Russell King (Oracle)
2021-06-16 10:16 ` Peter Zijlstra
2021-06-16 10:20 ` Peter Zijlstra
2021-06-16 10:34 ` Russell King (Oracle)
2021-06-16 11:10 ` Peter Zijlstra
2021-06-16 13:22 ` Russell King (Oracle)
2021-06-16 15:04 ` Catalin Marinas
2021-06-16 15:23 ` Russell King (Oracle)
2021-06-16 15:45 ` Catalin Marinas
2021-06-16 16:00 ` Catalin Marinas
2021-06-16 16:27 ` Russell King (Oracle)
2021-06-17 8:55 ` Krzysztof Hałasa
2021-06-18 12:54 ` Linus Walleij
2021-06-18 13:19 ` Russell King (Oracle)
2021-06-18 13:36 ` Arnd Bergmann
2021-06-17 10:40 ` Mark Rutland
2021-06-17 11:23 ` Russell King (Oracle)
2021-06-17 11:33 ` Mark Rutland
2021-06-17 13:41 ` Andy Lutomirski
2021-06-17 13:51 ` Mark Rutland
2021-06-17 14:00 ` Andy Lutomirski
2021-06-17 14:20 ` Mark Rutland
2021-06-17 15:01 ` Peter Zijlstra
2021-06-17 15:13 ` Peter Zijlstra
2021-06-17 14:16 ` Mathieu Desnoyers
2021-06-17 14:05 ` Peter Zijlstra
2021-06-18 0:07 ` Andy Lutomirski
2021-06-16 3:21 ` [PATCH 8/8] membarrier: Rewrite sync_core_before_usermode() and improve documentation Andy Lutomirski
2021-06-16 4:45 ` Nicholas Piggin
2021-06-16 18:52 ` Andy Lutomirski
2021-06-16 23:48 ` Andy Lutomirski [this message]
2021-06-18 15:27 ` Christophe Leroy
2021-06-16 10:20 ` Will Deacon
2021-06-16 23:58 ` Andy Lutomirski
2021-06-17 14:47 ` Mathieu Desnoyers
2021-06-18 0:12 ` Andy Lutomirski
2021-06-18 16:31 ` Mathieu Desnoyers
2021-06-18 19:58 ` Andy Lutomirski
2021-06-18 20:09 ` Mathieu Desnoyers
2021-06-19 6:02 ` Nicholas Piggin
2021-06-19 15:50 ` Andy Lutomirski
2021-06-20 2:10 ` Nicholas Piggin
2021-06-17 15:16 ` Mathieu Desnoyers
2021-06-18 0:13 ` Andy Lutomirski
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=57dae79c-fff8-411f-a375-1aa8a1cd10ac@www.fastmail.com \
--to=luto@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=benh@kernel.crashing.org \
--cc=catalin.marinas@arm.com \
--cc=dave.hansen@intel.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mathieu.desnoyers@efficios.com \
--cc=mpe@ellerman.id.au \
--cc=npiggin@gmail.com \
--cc=paulus@samba.org \
--cc=peterz@infradead.org \
--cc=stable@vger.kernel.org \
--cc=will@kernel.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).