CVE ID:	CVE-2024-35996
Description:	In the Linux kernel, the following vulnerability has been resolved: cpu: Re-enable CPU mitigations by default for !X86 architectures Rename x86's to CPU_MITIGATIONS, define it in generic code, and force it on for all architectures exception x86. A recent commit to turn mitigations off by default if SPECULATION_MITIGATIONS=n kinda sorta missed that "cpu_mitigations" is completely generic, whereas SPECULATION_MITIGATIONS is x86-specific. Rename x86's SPECULATIVE_MITIGATIONS instead of keeping both and have it select CPU_MITIGATIONS, as having two configs for the same thing is unnecessary and confusing. This will also allow x86 to use the knob to manage mitigations that aren't strictly related to speculative execution. Use another Kconfig to communicate to common code that CPU_MITIGATIONS is already defined instead of having x86's menu depend on the common CPU_MITIGATIONS. This allows keeping a single point of contact for all of x86's mitigations, and it's not clear that other architectures *want* to allow disabling mitigations at compile-time.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2024-35996 https://git.kernel.org/stable/c/36b32816fbab267611f073223f1b0b816ec5920f https://git.kernel.org/stable/c/36b32816fbab267611f073223f1b0b816ec5920f https://git.kernel.org/stable/c/38f17d1fbb5bfb56ca1419e2d06376d57a9396f9 https://git.kernel.org/stable/c/38f17d1fbb5bfb56ca1419e2d06376d57a9396f9 https://git.kernel.org/stable/c/8292f4f8dd1b005d0688d726261004f816ef730a https://git.kernel.org/stable/c/8292f4f8dd1b005d0688d726261004f816ef730a https://git.kernel.org/stable/c/af6d6a923b40bf6471e44067ac61cc5814b48e7f https://git.kernel.org/stable/c/af6d6a923b40bf6471e44067ac61cc5814b48e7f https://git.kernel.org/stable/c/fd8547ebc187037cc69441a15c1441aeaab80f49 https://git.kernel.org/stable/c/fd8547ebc187037cc69441a15c1441aeaab80f49 https://git.kernel.org/stable/c/fe42754b94a42d08cf9501790afc25c4f6a5f631 https://git.kernel.org/stable/c/fe42754b94a42d08cf9501790afc25c4f6a5f631