[tip: x86/core] x86/paravirt: Make struct paravirt_call_site unconditionally available

tip-bot2 for Thomas Gleixner
2022-10-17T14:55:20Z

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

Commit-ID: 239f2e248ef12840178a3ed1a217f19b5fbfde26
Gitweb: https://git.kernel.org/tip/239f2e248ef12840178a3ed1a217f19b5fbfde26
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Thu, 15 Sep 2022 13:11:22 +02:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Mon, 17 Oct 2022 16:41:12 +02:00

x86/paravirt: Make struct paravirt_call_site unconditionally available

For the upcoming call thunk patching it's less ifdeffery when the data
structure is unconditionally available. The code can then be trivially
fenced off with IS_ENABLED().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220915111147.367853167@infradead.org
---
arch/x86/include/asm/paravirt.h | 4 ++--
arch/x86/include/asm/paravirt_types.h | 20 ++++++++++++--------
2 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 1be66c1..2851bc2 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -4,13 +4,13 @@
/* Various instructions on x86 need to be replaced for
* para-virtualization: those hooks are defined here. */

+#include <asm/paravirt_types.h>
+
#ifdef CONFIG_PARAVIRT
#include <asm/pgtable_types.h>
#include <asm/asm.h>
#include <asm/nospec-branch.h>

-#include <asm/paravirt_types.h>
-
#ifndef __ASSEMBLY__
#include <linux/bug.h>
#include <linux/types.h>
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index f3d6015..e137d94 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -2,6 +2,17 @@
#ifndef _ASM_X86_PARAVIRT_TYPES_H
#define _ASM_X86_PARAVIRT_TYPES_H

+#ifndef __ASSEMBLY__
+/* These all sit in the .parainstructions section to tell us what to patch. */
+struct paravirt_patch_site {
+ u8 *instr; /* original instructions */
+ u8 type; /* type of this instruction */
+ u8 len; /* length of original instruction */
+};
+#endif
+
+#ifdef CONFIG_PARAVIRT
+
/* Bitmask of what can be clobbered: usually at least eax. */
#define CLBR_EAX (1 << 0)
#define CLBR_ECX (1 << 1)
@@ -593,16 +604,9 @@ unsigned long paravirt_ret0(void);

#define paravirt_nop ((void *)_paravirt_nop)

-/* These all sit in the .parainstructions section to tell us what to patch. */
-struct paravirt_patch_site {
- u8 *instr; /* original instructions */
- u8 type; /* type of this instruction */
- u8 len; /* length of original instruction */
-};
-
extern struct paravirt_patch_site __parainstructions[],
__parainstructions_end[];

#endif /* __ASSEMBLY__ */
-
+#endif /* CONFIG_PARAVIRT */
#endif /* _ASM_X86_PARAVIRT_TYPES_H */