mm/kconfig: drop redundant dependency wrappers

Some mm Kconfig entries repeat dependencies that are already expressed by
their surrounding blocks or menus.

The zsmalloc allocator options menu already depends on ZSMALLOC, so the
outer if ZSMALLOC block does not add any extra constraint. 
MEMORY_HOTREMOVE and MHP_MEMMAP_ON_MEMORY are both inside the if
MEMORY_HOTPLUG block, so their local depends on MEMORY_HOTPLUG entries are
redundant.

PTE_MARKER_UFFD_WP is the only entry under if USERFAULTFD.  Move the
USERFAULTFD dependency into the symbol itself and combine it with the
architecture support dependency.

This keeps the same visibility and defaults while avoiding duplicate
dependency expressions.

Link: https://lore.kernel.org/20260712093326.8313-1-kaitao.cheng@linux.dev
Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
Suggested-by: Julian Braha <julianbraha@gmail.com>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/Kconfig

@@ -125,8 +125,6 @@ config ZSWAP_COMPRESSOR_DEFAULT
 config ZSMALLOC
 	tristate
 
-if ZSMALLOC
-
 menu "Zsmalloc allocator options"
 	depends on ZSMALLOC
 
@@ -161,8 +159,6 @@ config ZSMALLOC_CHAIN_SIZE
 
 endmenu
 
-endif
-
 menu "Slab allocator options"
 
 config SLUB
@@ -583,12 +579,10 @@ endchoice
 
 config MEMORY_HOTREMOVE
 	bool "Allow for memory hot remove"
-	depends on MEMORY_HOTPLUG
 	select MIGRATION
 
 config MHP_MEMMAP_ON_MEMORY
 	def_bool y
-	depends on MEMORY_HOTPLUG
 	depends on ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
 
 endif # MEMORY_HOTPLUG
@@ -1393,17 +1387,15 @@ menuconfig USERFAULTFD
 	  Enable the userfaultfd() system call that allows to intercept and
 	  handle page faults in userland.
 
-if USERFAULTFD
 config PTE_MARKER_UFFD_WP
 	bool "Userfaultfd write protection support for shmem/hugetlbfs"
 	default y
-	depends on HAVE_ARCH_USERFAULTFD_WP
+	depends on USERFAULTFD && HAVE_ARCH_USERFAULTFD_WP
 
 	help
 	  Allows to create marker PTEs for userfaultfd write protection
 	  purposes.  It is required to enable userfaultfd write protection on
 	  file-backed memory types like shmem and hugetlbfs.
-endif # USERFAULTFD
 
 # multi-gen LRU {
 config LRU_GEN