[PATCH v2] xen: remove <asm/delay.h>

[Oleksii Kurochko <oleksii.kurochko@gmail.com>]

<asm/delay.h> only declares udelay() function so udelay()
declaration was moved to xen/delay.h.

For x86, __udelay() was renamed to udelay() and removed
inclusion of <asm/delay.h> in x86 code.

For ppc, udelay() stub definition was moved to ppc/stubs.c.

Suggested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---
Changes in v2:
 - rebase on top of the latest staging.
 - add Suggested-by:/Reviewed-by: Jan Beulich <jbeulich@suse.com>.
 - remove <asm/delay.h> for PPC.
 - remove changes related to RISC-V's <asm/delay.h> as they've not
   introduced in staging branch yet.
---
 xen/arch/arm/include/asm/delay.h  | 14 --------------
 xen/arch/ppc/include/asm/delay.h  | 12 ------------
 xen/arch/ppc/stubs.c              |  7 +++++++
 xen/arch/x86/cpu/microcode/core.c |  2 +-
 xen/arch/x86/delay.c              |  2 +-
 xen/arch/x86/include/asm/delay.h  | 13 -------------
 xen/include/xen/delay.h           |  2 +-
 7 files changed, 10 insertions(+), 42 deletions(-)
 delete mode 100644 xen/arch/arm/include/asm/delay.h
 delete mode 100644 xen/arch/ppc/include/asm/delay.h
 delete mode 100644 xen/arch/x86/include/asm/delay.h

diff --git a/xen/arch/arm/include/asm/delay.h b/xen/arch/arm/include/asm/delay.h
deleted file mode 100644
index 042907d9d5..0000000000
--- a/xen/arch/arm/include/asm/delay.h
+++ /dev/null
@@ -1,14 +0,0 @@
-#ifndef _ARM_DELAY_H
-#define _ARM_DELAY_H
-
-extern void udelay(unsigned long usecs);
-
-#endif /* defined(_ARM_DELAY_H) */
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/xen/arch/ppc/include/asm/delay.h b/xen/arch/ppc/include/asm/delay.h
deleted file mode 100644
index da6635888b..0000000000
--- a/xen/arch/ppc/include/asm/delay.h
+++ /dev/null
@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-#ifndef __ASM_PPC_DELAY_H__
-#define __ASM_PPC_DELAY_H__
-
-#include <xen/lib.h>
-
-static inline void udelay(unsigned long usecs)
-{
-    BUG_ON("unimplemented");
-}
-
-#endif /* __ASM_PPC_DELAY_H__ */
diff --git a/xen/arch/ppc/stubs.c b/xen/arch/ppc/stubs.c
index 4c276b0e39..a96e45626d 100644
--- a/xen/arch/ppc/stubs.c
+++ b/xen/arch/ppc/stubs.c
@@ -337,3 +337,10 @@ int __init parse_arch_dom0_param(const char *s, const char *e)
 {
     BUG_ON("unimplemented");
 }
+
+/* delay.c */
+
+void udelay(unsigned long usecs)
+{
+    BUG_ON("unimplemented");
+}
diff --git a/xen/arch/x86/cpu/microcode/core.c b/xen/arch/x86/cpu/microcode/core.c
index 65ebeb50de..22d5e04552 100644
--- a/xen/arch/x86/cpu/microcode/core.c
+++ b/xen/arch/x86/cpu/microcode/core.c
@@ -23,6 +23,7 @@
 
 #include <xen/alternative-call.h>
 #include <xen/cpu.h>
+#include <xen/delay.h>
 #include <xen/earlycpio.h>
 #include <xen/err.h>
 #include <xen/guest_access.h>
@@ -35,7 +36,6 @@
 
 #include <asm/apic.h>
 #include <asm/cpu-policy.h>
-#include <asm/delay.h>
 #include <asm/nmi.h>
 #include <asm/processor.h>
 #include <asm/setup.h>
diff --git a/xen/arch/x86/delay.c b/xen/arch/x86/delay.c
index 2662c26272..b3a41881a1 100644
--- a/xen/arch/x86/delay.c
+++ b/xen/arch/x86/delay.c
@@ -15,7 +15,7 @@
 #include <asm/msr.h>
 #include <asm/processor.h>
 
-void __udelay(unsigned long usecs)
+void udelay(unsigned long usecs)
 {
     unsigned long ticks = usecs * (cpu_khz / 1000);
     unsigned long s, e;
diff --git a/xen/arch/x86/include/asm/delay.h b/xen/arch/x86/include/asm/delay.h
deleted file mode 100644
index 9be2f46590..0000000000
--- a/xen/arch/x86/include/asm/delay.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef _X86_DELAY_H
-#define _X86_DELAY_H
-
-/*
- * Copyright (C) 1993 Linus Torvalds
- *
- * Delay routines calling functions in arch/i386/lib/delay.c
- */
-
-extern void __udelay(unsigned long usecs);
-#define udelay(n) __udelay(n)
-
-#endif /* defined(_X86_DELAY_H) */
diff --git a/xen/include/xen/delay.h b/xen/include/xen/delay.h
index 9150226271..8fd3b8f99f 100644
--- a/xen/include/xen/delay.h
+++ b/xen/include/xen/delay.h
@@ -3,7 +3,7 @@
 
 /* Copyright (C) 1993 Linus Torvalds */
 
-#include <asm/delay.h>
+void udelay(unsigned long usecs);
 
 static inline void mdelay(unsigned long msec)
 {
-- 
2.41.0