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Steven Rostedt
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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.