[PATCH] mm: memfd_luo: add CONFIG_SHMEM dependency

[Arnd Bergmann]

From: Arnd Bergmann <arnd@xxxxxxxx>

The new memfd code fails to link without SHMEM:

aarch64-linux-ld: mm/memfd_luo.o: in function `memfd_luo_retrieve_folios':
memfd_luo.c:(.text.memfd_luo_retrieve_folios+0xdc): undefined reference to `shmem_add_to_page_cache'
memfd_luo.c:(.text.memfd_luo_retrieve_folios+0x11c): undefined reference to `shmem_inode_acct_blocks'
memfd_luo.c:(.text.memfd_luo_retrieve_folios+0x134): undefined reference to `shmem_recalc_inode'

Add a Kconfig dependency to disallow that configuration.

Fixes: b3749f174d68 ("mm: memfd_luo: allow preserving memfd")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 kernel/liveupdate/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/liveupdate/Kconfig b/kernel/liveupdate/Kconfig
index 86a58eaf433a..80b77db2b0e0 100644
--- a/kernel/liveupdate/Kconfig
+++ b/kernel/liveupdate/Kconfig
@@ -53,6 +53,7 @@ config KEXEC_HANDOVER_ENABLE_DEFAULT
 config LIVEUPDATE
 	bool "Live Update Orchestrator"
 	depends on KEXEC_HANDOVER
+	depends on SHMEM
 	help
 	  Enable the Live Update Orchestrator. Live Update is a mechanism,
 	  typically based on kexec, that allows the kernel to be updated
-- 
2.39.5