From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Andy Lutomirski <luto@kernel.org>,
Nicholas Piggin <npiggin@gmail.com>,
x86@kernel.org
Cc: Will Deacon <will@kernel.org>,
linux-mm@kvack.org, Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
stable@vger.kernel.org, Dave Hansen <dave.hansen@intel.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Paul Mackerras <paulus@samba.org>,
Andrew Morton <akpm@linux-foundation.org>,
linuxppc-dev@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 8/8] membarrier: Rewrite sync_core_before_usermode() and improve documentation
Date: Fri, 18 Jun 2021 17:27:21 +0200 [thread overview]
Message-ID: <d1f62354-5249-f258-1a31-d3e8aebc29d7@csgroup.eu> (raw)
In-Reply-To: <1e248763-9372-6e4e-5dea-cda999000aeb@kernel.org>
Le 16/06/2021 à 20:52, Andy Lutomirski a écrit :
> 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
https://github.com/torvalds/linux/blob/master/arch/powerpc/include/asm/membarrier.h
Was added by https://github.com/torvalds/linux/commit/3ccfebedd8cf54e291c809c838d8ad5cc00f5688
>
>
>>
>> /*
>> * The RFI family of instructions are context synchronising, and
>> * that is how we return to userspace, so nothing is required here.
>> */
>
> Thanks!
>
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next prev parent reply other threads:[~2021-06-18 15:29 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
2021-06-18 15:27 ` Christophe Leroy [this message]
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
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