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Todd reported, and Len confirmed, that commit582077c940("x86/cfi: Clean up linkage") broke S4 hiberate on a fair number of machines. Turns out these machines trip #CP when trying to restore the image. As it happens, the commit in question removes two ENDBR instructions in the hibernate code, and clearly got it wrong. Notably restore_image() does an indirect jump to relocated_restore_code(), which is a relocated copy of core_restore_code(). In turn, core_restore_code(), will at the end do an indirect jump to restore_jump_address (r8), which is pointing at a relocated restore_registers(). So both sites do indeed need to be ENDBR. Fixes:582077c940("x86/cfi: Clean up linkage") Reported-by: Todd Brandt <todd.e.brandt@intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Todd Brandt <todd.e.brandt@intel.com> Tested-by: Len Brown <len.brown@intel.com> Link: https://bugzilla.kernel.org/show_bug.cgi?id=219998 Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219998
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.