mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-05 10:31:46 +09:00
4bc1033dff
commit cfceff8526a426948b53445c02bcb98453c7330d upstream. CALL_NOSPEC macro is used to generate Spectre-v2 mitigation friendly indirect branches. At compile time the macro defaults to indirect branch, and at runtime those can be patched to thunk based mitigations. This approach is opposite of what is done for the rest of the kernel, where the compile time default is to replace indirect calls with retpoline thunk calls. Make CALL_NOSPEC consistent with the rest of the kernel, default to retpoline thunk at compile time when CONFIG_RETPOLINE is enabled. [ pawan: s/CONFIG_MITIGATION_RETPOLINE/CONFIG_RETPOLINE/ ] Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Andrew Cooper <andrew.cooper3@citrix.com Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20250228-call-nospec-v3-1-96599fed0f33@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 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.