[tip: x86/bugs] x86: Move gds_ucode_mitigated() declaration to header

[tip-bot2 for Arnd Bergmann]

The following commit has been merged into the x86/bugs branch of tip:

Commit-ID:     eb3515dc99c7c85f4170b50838136b2a193f8012
Gitweb:        https://git.kernel.org/tip/eb3515dc99c7c85f4170b50838136b2a193f8012
Author:        Arnd Bergmann <arnd@xxxxxxxx>
AuthorDate:    Wed, 09 Aug 2023 15:05:00 +02:00
Committer:     Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
CommitterDate: Thu, 10 Aug 2023 09:13:21 -07:00

x86: Move gds_ucode_mitigated() declaration to header

The declaration got placed in the .c file of the caller, but that
causes a warning for the definition:

arch/x86/kernel/cpu/bugs.c:682:6: error: no previous prototype for 'gds_ucode_mitigated' [-Werror=missing-prototypes]

Move it to a header where both sides can observe it instead.

Fixes: 81ac7e5d74174 ("KVM: Add GDS_NO support to KVM")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Tested-by: Daniel Sneddon <daniel.sneddon@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxx
Link: https://lore.kernel.org/all/20230809130530.1913368-2-arnd%40kernel.org
---
 arch/x86/include/asm/processor.h | 2 ++
 arch/x86/kvm/x86.c               | 2 --
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 973db04..4ae2773 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -731,4 +731,6 @@ bool arch_is_platform_page(u64 paddr);
 #define arch_is_platform_page arch_is_platform_page
 #endif
 
+extern bool gds_ucode_mitigated(void);
+
 #endif /* _ASM_X86_PROCESSOR_H */
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 19d9ff9..c381770 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -314,8 +314,6 @@ u64 __read_mostly host_xcr0;
 
 static struct kmem_cache *x86_emulator_cache;
 
-extern bool gds_ucode_mitigated(void);
-
 /*
  * When called, it means the previous get/set msr reached an invalid msr.
  * Return true if we want to ignore/silent this failed msr access.