Hi Baoquan,
I love your patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v4.16 next-20180406]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system]
url:
Hi Baoquan,
I love your patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v4.16 next-20180406]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system]
url:
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The struct resource uses singly linked list to link siblings. It's not
easy to do reverse iteration on sibling list. So replace it with list_head.
And this makes codes in kernel/resource.c more readable after refactoring
than pointer operation.
Suggested-by: Andrew Morton
[ adding Paul and Josh ]
On Wed, Apr 4, 2018 at 2:46 AM, Jan Kara wrote:
> On Fri 30-03-18 21:03:30, Dan Williams wrote:
>> Background:
>>
>> get_user_pages() in the filesystem pins file backed memory pages for
>> access by devices performing dma. However, it only pins the memory
Due to locking constraints the nfit_test implementation is not able to
internally trigger ARS, so just run and wait for ARS manually in this
test. For example, here is what happens if nfit_test call
acpi_nfit_ars_rescan() from within the ioctl path.
WARNING: possible circular locking dependency
Changes since v2 [1]:
* Handle -EAGAIN (no result) ars_status responses
---
Given the fact that ARS can take 10s to 100s of seconds it is not
feasible to wait for ARS completion before publishing persistent memory
namespaces. Instead convert the ARS implementation to perform a short
ARS for
acpi_nfit_query_poison() is awkward in that it requires an nfit_spa
argument in order to determine what max_ars value to use. Instead probe
for the minimum max_ars across all scrub-capable ranges in the system
and drop the nfit_spa argument.
This enables a larger rework / simplification of the
ARS is an operation that can take 10s to 100s of seconds to find media
errors that should rarely be present. If the platform crashes due to
media errors in persistent memory, the expectation is that the BIOS will
report those known errors in a 'short' ARS request.
A 'short' ARS request asks
After attempting to quickly retrieve known errors the kernel proceeds to
kick off a long running ARS. Add a module option to disable this
behavior at initialization time, or at new region discovery time.
Otherwise, ARS can be started manually regardless of the state of this
setting.
The message about constraining number of online cpus to be less than or
equal to ND_MAX_LANES (256) is only useful for block-aperture
configurations and BTT. Make it debug since its only relevant when
debugging performance.
Signed-off-by: Dan Williams
---
The following NULL dereference results from incorrectly assuming that
ndd is valid in this print:
struct nvdimm_drvdata *ndd = to_ndd(_region->mapping[i]);
/*
* Give up if we don't find an instance of a uuid at each
* position (from 0 to nd_region->ndr_mappings - 1), or if we
* find
At initialization time the 'dimm' driver caches a copy of the memory
device's label area and reserves address space for each of the
namespaces defined.
However, as can be seen below, the reservation occurs even when the
index blocks are invalid:
nvdimm nmem0: nvdimm_init_config_data: len:
Oliver O'Halloran writes:
> Add device-tree binding documentation for the nvdimm region driver.
>
> Cc: devicet...@vger.kernel.org
> Signed-off-by: Oliver O'Halloran
> ---
> v2: Changed name from nvdimm-region to pmem-region.
> Cleaned up the example
On Sat, Apr 7, 2018 at 4:28 AM, Dan Williams wrote:
> On Thu, Apr 5, 2018 at 10:21 PM, Oliver O'Halloran wrote:
>> We want to be able to cross reference the region and bus devices
>> with the device tree node that they were spawned from. libNVDIMM
>>
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