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| author |   Peter Zijlstra <peterz@infradead.org> | 2023-08-14 13:44:30 +0200 |
|---|---|---|
| committer |   Borislav Petkov (AMD) <bp@alien8.de> | 2023-08-16 09:39:16 +0200 |
| commit | 095b8303f3835c68ac4a8b6d754ca1c3b6230711 (patch) | |
| tree | cb7fa68badd16e2ae51f0c8d30037894b25dc853 /arch/x86/kernel/cpu/bugs.c | |
| parent | objtool/x86: Fix SRSO mess (diff) | |
| download | wireguard-linux-095b8303f3835c68ac4a8b6d754ca1c3b6230711.tar.xz wireguard-linux-095b8303f3835c68ac4a8b6d754ca1c3b6230711.zip | |
x86/alternative: Make custom return thunk unconditional
There is infrastructure to rewrite return thunks to point to any
random thunk one desires, unwrap that from CALL_THUNKS, which up to
now was the sole user of that.
[ bp: Make the thunks visible on 32-bit and add ifdeffery for the
32-bit builds. ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230814121148.775293785@infradead.org
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kernel/cpu/bugs.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 6c04aef4b63b..3bc0d149eacd 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -63,6 +63,8 @@ EXPORT_SYMBOL_GPL(x86_pred_cmd); static DEFINE_MUTEX(spec_ctrl_mutex); +void (*x86_return_thunk)(void) __ro_after_init = &__x86_return_thunk; + /* Update SPEC_CTRL MSR and its cached copy unconditionally */ static void update_spec_ctrl(u64 val) { |