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Thu, 5 Sep 2019 20:18:27 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id Yncom_Kb2W_V; Thu, 5 Sep 2019 20:18:27 +0200 (CEST) Received: from [192.168.4.90] (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id A96088B911; Thu, 5 Sep 2019 20:18:26 +0200 (CEST) Subject: Re: [PATCH v3] powerpc/64: system call implement the bulk of the logic in C To: =?UTF-8?Q?Michal_Such=c3=a1nek?= References: <20190905123512.24311-1-npiggin@gmail.com> <1b0c7814-786e-f453-a26b-9d1cf7df12ce@c-s.fr> <20190905194638.74ab317d@kitsune.suse.cz> From: Christophe Leroy Message-ID: Date: Thu, 5 Sep 2019 20:18:26 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190905194638.74ab317d@kitsune.suse.cz> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Le 05/09/2019 à 19:46, Michal Suchánek a écrit : > On Thu, 5 Sep 2019 15:25:31 +0000 > Christophe Leroy wrote: > >> On 09/05/2019 12:35 PM, Nicholas Piggin wrote: >>> System call entry and particularly exit code is beyond the limit of what >>> is reasonable to implement in asm. >>> >>> This conversion moves all conditional branches out of the asm code, >>> except for the case that all GPRs should be restored at exit. >>> >>> Null syscall test is about 5% faster after this patch, because the exit >>> work is handled under local_irq_disable, and the hard mask and pending >>> interrupt replay is handled after that, which avoids games with MSR. >>> >>> Signed-off-by: Nicholas Piggin >> >> Cannot apply it on latest powerpc/merge. On what does that apply ? > > The v2 series had 4 patches so presumably the previous 3 are missing > here. > Yes indeed, the first two patches are already merged, so applying patch 3 of that series allows to apply this patch. Christophe