diff options
| author | Mateusz Guzik <mjguzik@gmail.com> | 2024-06-13 10:26:37 +0200 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-06-13 14:40:29 +0200 |
| commit | 501bd734f933f4eb5c080b87936e9d43f471d723 (patch) | |
| tree | 16b37e70d6317bdce9fdd6e8cc3b6e62b8c5e480 /arch/x86/kernel/cpu/amd.c | |
| parent | eb9d3c0bb065e55af6ec88e82a94b57fa1bb6e5d (diff) | |
x86/CPU/AMD: Always inline amd_clear_divider()
The routine is used on syscall exit and on non-AMD CPUs is guaranteed to
be empty.
It probably does not need to be a function call even on CPUs which do need the
mitigation.
[ bp: Make sure it is always inlined so that noinstr marking works. ]
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240613082637.659133-1-mjguzik@gmail.com
Diffstat (limited to 'arch/x86/kernel/cpu/amd.c')
| -rw-r--r-- | arch/x86/kernel/cpu/amd.c | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index 44df3f11e731..be5889bded49 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -1220,14 +1220,3 @@ void amd_check_microcode(void) on_each_cpu(zenbleed_check_cpu, NULL, 1); } - -/* - * Issue a DIV 0/1 insn to clear any division data from previous DIV - * operations. - */ -void noinstr amd_clear_divider(void) -{ - asm volatile(ALTERNATIVE("", "div %2\n\t", X86_BUG_DIV0) - :: "a" (0), "d" (0), "r" (1)); -} -EXPORT_SYMBOL_GPL(amd_clear_divider); |