Change in coreboot[master]: arch/{arm,arm64,ppc64,riscv}: Add noop cpu_relax

[Felix Held (Code Review)]

Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/59546 )

Change subject: arch/{arm,arm64,ppc64,riscv}: Add noop cpu_relax
......................................................................

arch/{arm,arm64,ppc64,riscv}: Add noop cpu_relax

The cpu_relax method is defined for x86. This CL adds a no-op method so
that it can be used in common code.

BUG=b:179699789
TEST=none

Signed-off-by: Raul E Rangel 
Change-Id: Ifcb4546ceb2894eeb37589d0282b7e076d7a4747
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59546
Tested-by: build bot (Jenkins) 
Reviewed-by: Julius Werner 
---
M src/arch/arm/include/armv4/arch/cpu.h
M src/arch/arm/include/armv7/arch/cpu.h
M src/arch/arm64/include/armv8/arch/cpu.h
M src/arch/ppc64/include/arch/cpu.h
M src/arch/riscv/include/arch/cpu.h
5 files changed, 11 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Julius Werner: Looks good to me, approved

diff --git a/src/arch/arm/include/armv4/arch/cpu.h b/src/arch/arm/include/armv4/arch/cpu.h
index 8a1b00e..4c6cdf8 100644
--- a/src/arch/arm/include/armv4/arch/cpu.h
+++ b/src/arch/arm/include/armv4/arch/cpu.h
@@ -3,6 +3,8 @@
 #ifndef __ARCH_CPU_H__
 #define __ARCH_CPU_H__

+static inline void cpu_relax(void) { }
+
 #define asmlinkage

#endif /* __ARCH_CPU_H__ */
diff --git a/src/arch/arm/include/armv7/arch/cpu.h b/src/arch/arm/include/armv7/arch/cpu.h
index 3f1f1ae..e3154e9 100644
--- a/src/arch/arm/include/armv7/arch/cpu.h
+++ b/src/arch/arm/include/armv7/arch/cpu.h
@@ -6,6 +6,8 @@
 #include <stdint.h>
 #include <device/device.h>

+static inline void cpu_relax(void) { }
+
 #define asmlinkage

struct cpu_driver {
diff --git a/src/arch/arm64/include/armv8/arch/cpu.h b/src/arch/arm64/include/armv8/arch/cpu.h
index 15b2065..e5e8a7c 100644
--- a/src/arch/arm64/include/armv8/arch/cpu.h
+++ b/src/arch/arm64/include/armv8/arch/cpu.h
@@ -3,6 +3,9 @@
 #ifndef __ARCH_CPU_H__
 #define __ARCH_CPU_H__

+/* TODO: Implement using SEV/WFE if this is ever actually used. */
+static inline void cpu_relax(void) { }
+
 #define asmlinkage

struct cpu_driver { };
diff --git a/src/arch/ppc64/include/arch/cpu.h b/src/arch/ppc64/include/arch/cpu.h
index 5e5ba30..638406d 100644
--- a/src/arch/ppc64/include/arch/cpu.h
+++ b/src/arch/ppc64/include/arch/cpu.h
@@ -5,6 +5,8 @@

#include <device/device.h>

+static inline void cpu_relax(void) { }
+
 #define asmlinkage

struct cpu_driver {
diff --git a/src/arch/riscv/include/arch/cpu.h b/src/arch/riscv/include/arch/cpu.h
index 7cf9461..d51d8a9 100644
--- a/src/arch/riscv/include/arch/cpu.h
+++ b/src/arch/riscv/include/arch/cpu.h
@@ -6,6 +6,8 @@
 #include <arch/encoding.h>
 #include <device/device.h>

+static inline void cpu_relax(void) { }
+
 #define asmlinkage

struct cpu_driver {