linux-next: manual merge of the uml tree with the mm tree

From: Mark Brown

Date: Fri Sep 25 2026 - 07:54:46 EST


Hi all,

Today's linux-next merge of the uml tree got a conflict in:

arch/um/Kconfig

between commit:

f56266a653013 ("mm: make userland page table freeing RCU-safe")

from the mm tree and commit:

626ff2b34dbb7 ("um: allow deselecting CONFIG_MMU")

from the uml tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging. You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

diff --cc arch/um/Kconfig
index 94b8ff70f578b,59d62c74fc41f..0000000000000
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@@ -44,10 -45,16 +45,15 @@@ config UM
select HAVE_SYSCALL_TRACEPOINTS
select THREAD_INFO_IN_TASK
select SPARSE_IRQ
- select MMU_GATHER_RCU_TABLE_FREE if MMU
+ select UACCESS_MEMCPY if !MMU
+ select GENERIC_STRNLEN_USER if !MMU
+ select GENERIC_STRNCPY_FROM_USER if !MMU

config MMU
- bool
+ bool "MMU support"
default y
+ help
+ Turning this off allows a nommu build, say Y.

config UML_DMA_EMULATION
bool

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