From: Coly Li <colyli@suse.de>
To: Randy Dunlap <rdunlap@infradead.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Linux Next Mailing List <linux-next@vger.kernel.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
linux-bcache@vger.kernel.org,
Kent Overstreet <kent.overstreet@gmail.com>
Subject: Re: linux-next: Tree for Apr 19 (bcache)
Date: Tue, 20 Apr 2021 00:26:45 +0800 [thread overview]
Message-ID: <f4ca485d-614b-6924-63bc-0948d087bdc3@suse.de> (raw)
In-Reply-To: <66d41349-60ba-f27f-5c56-3520a40dd83f@infradead.org>
On 4/19/21 11:40 PM, Randy Dunlap wrote:
> On 4/19/21 3:23 AM, Stephen Rothwell wrote:
>> Hi all,
>>
>> Changes since 20210416:
>>
>
> on x86_64:
>
> when
> # CONFIG_BLK_DEV is not set
>
>
> WARNING: unmet direct dependencies detected for LIBNVDIMM
> Depends on [n]: PHYS_ADDR_T_64BIT [=y] && HAS_IOMEM [=y] && BLK_DEV [=n]
> Selected by [y]:
> - BCACHE_NVM_PAGES [=y] && MD [=y] && BCACHE [=y] && PHYS_ADDR_T_64BIT [=y]
>
>
> Full randconfig file is attached.
>
I need hint from kbuild expert.
My original idea to use "select LIBNVDIMM" is to avoid the
BCACHE_NVM_PAGES option to disappear if LIBNVDIMM is not enabled.
Otherwise if nvdimm driver is not configure, users won't know there is a
BCACHE_NVM_PAGES option unless they read bcache Kconfig file.
But I see nvdimm's Kconfig, it uses "depends on BLK_DEV", I understand
it is acceptable that LIBNVDIMM option to disappear from "make
menuconfig" if BLK_DEV is not enabled.
For such condition, which one is the proper way to set the dependence ?
- Change "select LIBNVDIMM" and "select DAX" to "depends on LIBNVDIMM"
and "depends on DAX" in bcache Kconfig
- Or change "depends on BLK_DEV" to "select BLK_DEV" in nvdimm Kconfig.
I want to ask for a proper way to handle such dependence, and I will
follow the guide for now and in future.
Thanks in advance for the advice.
Coly Li
next prev parent reply other threads:[~2021-04-19 16:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210419202309.0575ad77@canb.auug.org.au>
2021-04-19 15:40 ` linux-next: Tree for Apr 19 (bcache) Randy Dunlap
2021-04-19 16:26 ` Coly Li [this message]
2021-04-19 17:50 ` Jens Axboe
2021-04-20 4:24 ` Coly Li
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