[PATCH hmm v2 1/5] mm/hmm: make CONFIG_DEVICE_PRIVATE into a select
akpm at linux-foundation.org
Sun May 10 00:16:12 UTC 2020
On Fri, 1 May 2020 15:20:44 -0300 Jason Gunthorpe <jgg at ziepe.ca> wrote:
> From: Jason Gunthorpe <jgg at mellanox.com>
> There is no reason for a user to select this or not directly - it should
> be selected by drivers that are going to use the feature, similar to how
> CONFIG_HMM_MIRROR works.
> Currently all drivers provide a feature kconfig that will disable use of
> DEVICE_PRIVATE in that driver, allowing users to avoid enabling this if
> they don't want the overhead.
I'm not too sure what's going on here, but i386 allmodconfig broke.
kernel/resource.c: In function '__request_free_mem_region':
kernel/resource.c:1653:28: error: 'PA_SECTION_SHIFT' undeclared (first use in this function); did you mean 'SECTIONS_PGSHIFT'?
size = ALIGN(size, 1UL << PA_SECTION_SHIFT);
because in current mainline, allmodconfig produces
CONFIG_DEVICE_PRIVATE=n but in current linux-next, allmodconfig
produces CONFIG_DEVICE_PRIVATE=y. But CONFIG_SPARSEMEM=n so the build
Bisection fingers this commit, but reverting it doesn't seem to fix
things. Could you take a look please?
I'm seeing this from menuconfig:
WARNING: unmet direct dependencies detected for DEVICE_PRIVATE
Depends on [n]: ZONE_DEVICE [=n]
Selected by [m]:
- DRM_NOUVEAU_SVM [=y] && HAS_IOMEM [=y] && DRM_NOUVEAU [=m] && MMU [=y] && STAGING [=y]
- TEST_HMM [=m] && RUNTIME_TESTING_MENU [=y] && TRANSPARENT_HUGEPAGE [=y]
`select' rather sucks this way - easy to break dependencies. Quite a
number of years ago the Kconfig gurus were saying "avoid", but I don't
recall the details.
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