[PATCH] move __read_mostly to xen/cache.h

[Jan Beulich <jbeulich@xxxxxxxx>]

There's no need for every arch to define its own identical copy. If down
the road an arch needs to customize it, we can add #ifndef around the
common #define.

To be on the safe side build-breakage-wise, change a couple of #include
<asm/cache.h> to the xen/ equivalent.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/arm/include/asm/cache.h
+++ b/xen/arch/arm/include/asm/cache.h
@@ -6,8 +6,6 @@
 #define L1_CACHE_SHIFT  (CONFIG_ARM_L1_CACHE_SHIFT)
 #define L1_CACHE_BYTES  (1 << L1_CACHE_SHIFT)
 
-#define __read_mostly __section(".data.read_mostly")
-
 #endif
 /*
  * Local variables:
--- a/xen/arch/x86/acpi/cpu_idle.c
+++ b/xen/arch/x86/acpi/cpu_idle.c
@@ -34,13 +34,13 @@
 #include <xen/lib.h>
 #include <xen/types.h>
 #include <xen/acpi.h>
+#include <xen/cache.h>
 #include <xen/smp.h>
 #include <xen/guest_access.h>
 #include <xen/keyhandler.h>
 #include <xen/param.h>
 #include <xen/trace.h>
 #include <xen/irq.h>
-#include <asm/cache.h>
 #include <asm/io.h>
 #include <asm/iocap.h>
 #include <asm/hpet.h>
--- a/xen/arch/x86/flushtlb.c
+++ b/xen/arch/x86/flushtlb.c
@@ -7,11 +7,11 @@
  * Copyright (c) 2003-2006, K A Fraser
  */
 
+#include <xen/cache.h>
 #include <xen/paging.h>
 #include <xen/sched.h>
 #include <xen/smp.h>
 #include <xen/softirq.h>
-#include <asm/cache.h>
 #include <asm/flushtlb.h>
 #include <asm/invpcid.h>
 #include <asm/nops.h>
--- a/xen/arch/x86/genapic/probe.c
+++ b/xen/arch/x86/genapic/probe.c
@@ -6,10 +6,10 @@
 #include <xen/cpumask.h>
 #include <xen/string.h>
 #include <xen/kernel.h>
+#include <xen/cache.h>
 #include <xen/ctype.h>
 #include <xen/init.h>
 #include <xen/param.h>
-#include <asm/cache.h>
 #include <asm/fixmap.h>
 #include <asm/mpspec.h>
 #include <asm/apicdef.h>
--- a/xen/arch/x86/guest/hypervisor.c
+++ b/xen/arch/x86/guest/hypervisor.c
@@ -6,11 +6,11 @@
  *
  * Copyright (c) 2019 Microsoft.
  */
+#include <xen/cache.h>
 #include <xen/cpumask.h>
 #include <xen/init.h>
 #include <xen/types.h>
 
-#include <asm/cache.h>
 #include <asm/guest.h>
 
 static struct hypervisor_ops __read_mostly ops;
--- a/xen/arch/x86/include/asm/cache.h
+++ b/xen/arch/x86/include/asm/cache.h
@@ -9,8 +9,6 @@
 #define L1_CACHE_SHIFT (CONFIG_X86_L1_CACHE_SHIFT)
 #define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
 
-#define __read_mostly __section(".data.read_mostly")
-
 #ifndef __ASSEMBLY__
 
 void cache_flush(const void *addr, unsigned int size);
--- a/xen/common/version.c
+++ b/xen/common/version.c
@@ -1,3 +1,4 @@
+#include <xen/cache.h>
 #include <xen/compile.h>
 #include <xen/init.h>
 #include <xen/errno.h>
@@ -8,8 +9,6 @@
 #include <xen/elf.h>
 #include <xen/version.h>
 
-#include <asm/cache.h>
-
 const char *xen_compile_date(void)
 {
     return XEN_COMPILE_DATE;
--- a/xen/include/xen/cache.h
+++ b/xen/include/xen/cache.h
@@ -15,6 +15,7 @@
 #define __cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES)))
 #endif
 
+#define __read_mostly   __section(".data.read_mostly")
 #define __ro_after_init __section(".data.ro_after_init")
 
 #endif /* __LINUX_CACHE_H */