mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-04-15 06:02:02 -04:00
1a576136f8
When CONFIG_SHMEM is not set, the following compiler error occurs: ld: vmlinux.o: in function `ttm_backup_backup_page': (.text+0x10363bc): undefined reference to `shmem_writeout' make[3]: *** [/work/build/trace/nobackup/linux.git/scripts/Makefile.vmlinux:91: vmlinux.unstripped] Error 1 This is due to the replacement of writepage and calling swap_writeout() and shmem_writeout() directly. The issue is that when CONFIG_SHMEM is not defined, shmem_writeout() is also not defined. The function ttm_backup_backup_page() called mapping->a_ops->writepage() which was then changed to call shmem_writeout() directly. Even before commit84798514db("mm: Remove swap_writepage() and shmem_writepage()"), it didn't make sense to call anything other than shmem_writeout() as the ttm_backup deals only with shmem folios. Have DRM_TTM config option select SHMEM to guarantee that shmem_writeout() is available. Link: https://lore.kernel.org/all/20250602170500.48713a2b@gandalf.local.home/ Suggested-by: Hugh Dickins <hughd@google.com> Fixes:84798514db("mm: Remove swap_writepage() and shmem_writepage()") Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>