From: Nathan_Lynch@mentor•com (Nathan Lynch)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v10 4/6] ARM: add vdso user-space code
Date: Mon, 16 Feb 2015 14:05:15 -0600 [thread overview]
Message-ID: <54E24D7B.3050806@mentor.com> (raw)
In-Reply-To: <loom.20150213T053547-381@post.gmane.org>
On 02/12/2015 10:36 PM, Venkappa Mala wrote:
> Nathan Lynch <nathan_lynch <at> mentor.com> writes:
>
>> +#ifdef CONFIG_ARM_ARCH_TIMER
>> +
>> +static notrace u64 get_ns(struct vdso_data *vdata)
>> +{
>> + u64 cycle_delta;
>> + u64 cycle_now;
>> + u64 nsec;
>> +
>> + cycle_now = arch_counter_get_cntvct();
>
> Hello Nathan,
>
> Regarding ARM:vDSO, I have enabled your patch set on Cortex-A7/ARMv7,
> the vDSO is up and running using generic arch timer using physical
> counter but not with VCT.
Hi,
Sorry for not seeing this earlier but it doesn't look like my address
was in the recipients list, and I just happened to catch up on list
traffic today.
It looks like Catalin already covered everything, but just to sum up --
the patches need to be updated to avoid enabling the VDSO gettimeofday
on systems where CNTVCT is not usable, for whatever reason. I do not
intend to enable user space / VDSO access to CNTPCT to accommodate
systems that don't initialize the virtual counter/offset correctly.
next prev parent reply other threads:[~2015-02-16 20:05 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-22 19:17 [PATCH v10 0/6] ARM: VDSO Nathan Lynch
2014-09-22 19:18 ` [PATCH v10 1/6] ARM: use _install_special_mapping for sigpage Nathan Lynch
2014-09-22 19:18 ` [PATCH v10 2/6] ARM: place sigpage at a random offset above stack Nathan Lynch
2014-09-22 19:18 ` [PATCH v10 3/6] ARM: miscellaneous vdso infrastructure, preparation Nathan Lynch
2014-09-22 19:18 ` [PATCH v10 4/6] ARM: add vdso user-space code Nathan Lynch
2015-02-13 4:36 ` Venkappa Mala
2015-02-13 10:54 ` Catalin Marinas
2015-02-13 12:01 ` Venkappa Mala
2015-02-13 14:14 ` Catalin Marinas
2015-02-13 14:56 ` Venkappa Mala
2015-02-13 15:32 ` Catalin Marinas
2015-02-18 12:12 ` Venkappa Mala
2015-02-20 21:52 ` Christopher Covington
2015-02-24 10:17 ` Catalin Marinas
2015-02-25 16:56 ` Christopher Covington
2015-02-25 17:17 ` Catalin Marinas
2015-02-16 20:05 ` Nathan Lynch [this message]
2015-02-19 12:26 ` Venkappa Mala
2014-09-22 19:18 ` [PATCH v10 5/6] ARM: vdso initialization, mapping, and synchronization Nathan Lynch
2014-09-22 19:18 ` [PATCH v10 6/6] ARM: add CONFIG_VDSO Kconfig and Makefile bits Nathan Lynch
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