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| author | Arnd Bergmann <arnd@arndb.de> | 2017-10-06 09:13:46 +0200 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2017-10-10 16:49:44 +0200 |
| commit | 9cc12ad6db55d7d902260fead28a91710dd5dbe5 (patch) | |
| tree | 5516b9a7c5ce18ca26a6d965d4ec04b725a26d3c /drivers/infiniband/Kconfig | |
| parent | IB/rxe: put the pool on allocation failure (diff) | |
| download | linux-9cc12ad6db55d7d902260fead28a91710dd5dbe5.tar.xz linux-9cc12ad6db55d7d902260fead28a91710dd5dbe5.zip | |
infiniband: add MMU dependency for user_mem
The infiniband subsystem causes a link failure when the umem
driver is built on MMU-less systems:
mm/mmu_notifier.o: In function `do_mmu_notifier_register':
mmu_notifier.c:(.text+0x32): undefined reference to `mm_take_all_locks'
drivers/infiniband/core/umem.o: In function `ib_umem_get':
umem.c:(.text+0x132): undefined reference to `can_do_mlock'
drivers/infiniband/core/umem_odp.o: In function `ib_umem_odp_map_dma_pages':
umem_odp.c:(.text+0x766): undefined reference to `get_user_pages_remote'
This bug has existed for a while but only become apparent in ARM
randconfig builds when the dependency on PCI was lifted, as none
of the ARM-NOMMU targets support PCI at the moment.
We could probably get the umem driver to build by providing an
alternative implementation 'can_do_mlock()' that returns false
on NOMMU-systems, but then we'd still have a problem with the
mmu-notifiers required by CONFIG_INFINIBAND_ON_DEMAND_PAGING,
so simply forbidding umem with NOMMU seems like the simplest
workaround.
Fixes: 931bc0d91639 ("IB: Move PCI dependency from root KConfig to HW's KConfigs")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/Kconfig')
| -rw-r--r-- | drivers/infiniband/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig index b62b3b1e09cd..98ac46ed7214 100644 --- a/drivers/infiniband/Kconfig +++ b/drivers/infiniband/Kconfig @@ -45,6 +45,7 @@ config INFINIBAND_EXP_USER_ACCESS config INFINIBAND_USER_MEM bool depends on INFINIBAND_USER_ACCESS != n + depends on MMU default y config INFINIBAND_ON_DEMAND_PAGING |