Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
In-Reply-To: <CAK8P3a0GQDrj+7kc4YB1_ZC1vCWmMtSiYeKsNir_27FvY50Kmg@mail.gmail.com>
References: <cover.1515766253.git.green.hu@gmail.com> <4a602db0a58cc858515c3c669d5ac34c567b061c.1515766253.git.green.hu@gmail.com>
 <CAK8P3a0GQDrj+7kc4YB1_ZC1vCWmMtSiYeKsNir_27FvY50Kmg@mail.gmail.com>
From:   Vincent Chen <deanbo422@gmail.com>
Date:   Tue, 6 Feb 2018 15:41:16 +0800
Message-ID: <CAJsyPhwHmMrXmN2-NW3ZyvRvTWR0vio_bQO+GDBf30DVp=5LTw@mail.gmail.com>
Subject: Re: [PATCH v6 19/36] nds32: VDSO support
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Greentime Hu <green.hu@gmail.com>,
        Greentime <greentime@andestech.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-arch <linux-arch@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Rob Herring <robh+dt@kernel.org>,
        Networking <netdev@vger.kernel.org>,
        DTML <devicetree@vger.kernel.org>,
        Al Viro <viro@zeniv.linux.org.uk>,
        David Howells <dhowells@redhat.com>,
        Will Deacon <will.deacon@arm.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        linux-serial@vger.kernel.org,
        Geert Uytterhoeven <geert.uytterhoeven@gmail.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Mark Rutland <mark.rutland@arm.com>, Greg KH <greg@kroah.com>,
        Guo Ren <ren_guo@c-sky.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        David Miller <davem@davemloft.net>,
        Jonas Bonn <jonas@southpole.se>,
        Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
        Stafford Horne <shorne@gmail.com>,
        Vincent Chen <vincentc@andestech.com>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

2018-01-18 18:28 GMT+08:00 Arnd Bergmann <arnd@arndb.de>:
> On Mon, Jan 15, 2018 at 6:53 AM, Greentime Hu <green.hu@gmail.com> wrote:
>> From: Greentime Hu <greentime@andestech.com>
>>
>> This patch adds VDSO support. The VDSO code is currently used for
>> sys_rt_sigreturn() and optimised gettimeofday() (using the SoC timer counter).
>>
>> Signed-off-by: Vincent Chen <vincentc@andestech.com>
>> Signed-off-by: Greentime Hu <greentime@andestech.com>
>
> Acked-by: Arnd Bergmann <arnd@arndb.de>

Dear Arnd Bergmann:

We find a small bug here which make LTP 20170929 clock_getres01
fail. The bug is in __vdso_clock_getres() function. When argument res
is NULL, -EFAULT error code is returned now. But, the returned
value is 0 for SyS_clock_getres under the same conditions.
Therefore, testcase thinks it is a bug.

I will modify the code as below and add it in the next version patch
if you think it is OK.

@@ -209,7 +209,7 @@ static notrace int clock_getres_fallback( ...
 {
         if (res == NULL)
-                return -EFAULT;
+                return 0;


Thanks

Vincnet