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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2024-05-14 18:51:37 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2024-05-14 18:51:37 +0300 |
| commit | 25c7cb05fa61078d99d56fda36bd6d0a1638139d (patch) | |
| tree | 509316274d6f4e4cac2b0121a631bfdd79ba2d2a /arch/x86/kernel/cpu | |
| parent | b4864f6565ab57d6418ec469330e320f77eeee95 (diff) | |
| parent | 8dc8b02d707ee4167fffaf3a97003bcdac282876 (diff) | |
| download | linux-25c7cb05fa61078d99d56fda36bd6d0a1638139d.tar.xz | |
Merge tag 'x86_alternatives_for_v6.10_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 asm alternatives updates from Borislav Petkov:
- Switch the in-place instruction patching which lead to at least one
weird bug with 32-bit guests, seeing stale instruction bytes, to one
working on a buffer, like the rest of the alternatives code does
- Add a long overdue check to the X86_FEATURE flag modifying functions
to warn when former get changed in a non-compatible way after
alternatives have been patched because those changes will be already
wrong
- Other cleanups
* tag 'x86_alternatives_for_v6.10_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/alternatives: Remove alternative_input_2()
x86/alternatives: Sort local vars in apply_alternatives()
x86/alternatives: Optimize optimize_nops()
x86/alternatives: Get rid of __optimize_nops()
x86/alternatives: Use a temporary buffer when optimizing NOPs
x86/alternatives: Catch late X86_FEATURE modifiers
Diffstat (limited to 'arch/x86/kernel/cpu')
| -rw-r--r-- | arch/x86/kernel/cpu/cpuid-deps.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c index 946813d816bf..b7d9f530ae16 100644 --- a/arch/x86/kernel/cpu/cpuid-deps.c +++ b/arch/x86/kernel/cpu/cpuid-deps.c @@ -114,6 +114,9 @@ static void do_clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int feature) if (WARN_ON(feature >= MAX_FEATURE_BITS)) return; + if (boot_cpu_has(feature)) + WARN_ON(alternatives_patched); + clear_feature(c, feature); /* Collect all features to disable, handling dependencies */ |