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Loading i915 on UBSAN enabled kernels (CONFIG_UBSAN/CONFIG_UBSAN_BOOL) causes the following warning: UBSAN: invalid-load in drivers/gpu/drm/i915/gt/uc/intel_uc.c:558:2 load of value 255 is not a valid value for type '_Bool' Call Trace: dump_stack_lvl+0x57/0x7d ubsan_epilogue+0x5/0x40 __ubsan_handle_load_invalid_value.cold+0x43/0x48 __uc_init_hw+0x76a/0x903 [i915] ... i915_driver_probe+0xfb1/0x1eb0 [i915] i915_pci_probe+0xbe/0x2d0 [i915] The warning happens because during probe i915_hwmon is still not available which results in the output boolean variable *old remaining uninitialized. Silence the warning by initializing the variable to an arbitrary value. v2: Move variable initialization to the declaration (Andi) Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com> Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230512203735.2635237-1-ashutosh.dixit@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.