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The function is only defined if CONFIG_PROC_FS is enabled: ld.lld: error: undefined symbol: i915_drm_client_fdinfo >>> referenced by i915_driver.c >>> drivers/gpu/drm/i915/i915_driver.o:(i915_drm_driver) in archive vmlinux.a Use the PTR_IF() helper to make the reference NULL otherwise. Fixes:e894b724c3("drm/i915: Use the fdinfo helper") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Acked-by: Randy Dunlap <rdunlap@infradead.org> Tested-by: Randy Dunlap <rdunlap@infradead.org> # build-tested Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230616093158.3568480-1-arnd@kernel.org (cherry picked from commit8084c63743) Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
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 Restructured Text 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.