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Steven Rostedt 1a576136f8 drm/ttm: Fix compile error when CONFIG_SHMEM is not set 
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 commit 84798514db ("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>
2025-06-04 08:49:03 -07:00
arch MFD for v6.16 2025-06-03 11:53:55 -07:00
block - dm: better error handling when reloading a table 2025-06-03 15:54:46 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto EFI updates for v6.16 2025-05-30 12:42:57 -07:00
Documentation CXL changes for v6.16 2025-06-03 13:24:14 -07:00
drivers drm/ttm: Fix compile error when CONFIG_SHMEM is not set 2025-06-04 08:49:03 -07:00
fs NFS Clent Updates for Linux 6.16 2025-06-03 16:13:32 -07:00
include NFS Clent Updates for Linux 6.16 2025-06-03 16:13:32 -07:00
init - The 2 patch series "zram: support algorithm-specific parameters" from 2025-06-02 16:00:26 -07:00
io_uring Networking changes for 6.16. 2025-05-28 15:24:36 -07:00
ipc - The 3 patch series "hung_task: extend blocking task stacktrace dump to 2025-05-31 19:12:53 -07:00
kernel tracing fixes: 2025-06-03 14:21:31 -07:00
lib bitmap-for-6.16 2025-06-03 07:39:23 -07:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm - The 2 patch series "zram: support algorithm-specific parameters" from 2025-06-02 16:00:26 -07:00
net NFS Clent Updates for Linux 6.16 2025-06-03 16:13:32 -07:00
rust - The 2 patch series "zram: support algorithm-specific parameters" from 2025-06-02 16:00:26 -07:00
samples - The 3 patch series "hung_task: extend blocking task stacktrace dump to 2025-05-31 19:12:53 -07:00
scripts - The 2 patch series "zram: support algorithm-specific parameters" from 2025-06-02 16:00:26 -07:00
security require gcc-8 and binutils-2.30 2025-05-31 08:16:52 -07:00
sound sound updates for 6.16-rc1 2025-05-27 15:05:18 -07:00
tools perf tools improvements and fixes for Linux v6.16: 2025-06-03 15:11:44 -07:00
usr usr/include: openrisc: don't HDRTEST bpf_perf_event.h 2025-05-12 15:03:17 +09:00
virt Merge branch 'kvm-lockdep-common' into HEAD 2025-05-28 06:29:17 -04:00
.clang-format Linux 6.15-rc5 2025-05-06 16:39:25 +10:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore Python compiled bytecode 2025-04-24 10:12:46 -06:00
.mailmap - The 3 patch series "hung_task: extend blocking task stacktrace dump to 2025-05-31 19:12:53 -07:00
.pylintrc docs: add a .pylintrc file with sys path for docs scripts 2025-04-09 12:10:33 -06:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS Update Christoph's Email address and make it consistent 2025-05-12 23:50:31 -07:00
Kbuild drm: ensure drm headers are self-contained and pass kernel-doc 2025-02-12 10:44:43 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS perf tools improvements and fixes for Linux v6.16: 2025-06-03 15:11:44 -07:00
Makefile A moderately busy cycle for documentation this time around: 2025-05-27 11:22:19 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

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.