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-rw-r--r--arch/ia64/Makefile6
-rw-r--r--arch/ia64/kernel/Makefile33
-rw-r--r--arch/ia64/kernel/nr-irqs.c24
3 files changed, 63 insertions, 0 deletions
diff --git a/arch/ia64/Makefile b/arch/ia64/Makefile
index 88f1a55c6c94..3b9c8cadfd34 100644
--- a/arch/ia64/Makefile
+++ b/arch/ia64/Makefile
@@ -99,3 +99,9 @@ define archhelp
echo ' boot - Build vmlinux and bootloader for Ski simulator'
echo '* unwcheck - Check vmlinux for invalid unwind info'
endef
+
+archprepare: make_nr_irqs_h FORCE
+PHONY += make_nr_irqs_h FORCE
+
+make_nr_irqs_h: FORCE
+ $(Q)$(MAKE) $(build)=arch/ia64/kernel include/asm-ia64/nr-irqs.h
diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index cea91f17d44b..87fea11aecb7 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -73,6 +73,39 @@ $(obj)/gate-syms.o: $(obj)/gate.lds $(obj)/gate.o FORCE
# Note: kbuild does not track this dependency due to usage of .incbin
$(obj)/gate-data.o: $(obj)/gate.so
+# Calculate NR_IRQ = max(IA64_NATIVE_NR_IRQS, XEN_NR_IRQS, ...) based on config
+define sed-y
+ "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"
+endef
+quiet_cmd_nr_irqs = GEN $@
+define cmd_nr_irqs
+ (set -e; \
+ echo "#ifndef __ASM_NR_IRQS_H__"; \
+ echo "#define __ASM_NR_IRQS_H__"; \
+ echo "/*"; \
+ echo " * DO NOT MODIFY."; \
+ echo " *"; \
+ echo " * This file was generated by Kbuild"; \
+ echo " *"; \
+ echo " */"; \
+ echo ""; \
+ sed -ne $(sed-y) $<; \
+ echo ""; \
+ echo "#endif" ) > $@
+endef
+
+# We use internal kbuild rules to avoid the "is up to date" message from make
+arch/$(SRCARCH)/kernel/nr-irqs.s: $(srctree)/arch/$(SRCARCH)/kernel/nr-irqs.c \
+ $(wildcard $(srctree)/include/asm-ia64/*/irq.h)
+ $(Q)mkdir -p $(dir $@)
+ $(call if_changed_dep,cc_s_c)
+
+include/asm-ia64/nr-irqs.h: arch/$(SRCARCH)/kernel/nr-irqs.s
+ $(Q)mkdir -p $(dir $@)
+ $(call cmd,nr_irqs)
+
+clean-files += $(objtree)/include/asm-ia64/nr-irqs.h
+
#
# native ivt.S and entry.S
#
diff --git a/arch/ia64/kernel/nr-irqs.c b/arch/ia64/kernel/nr-irqs.c
new file mode 100644
index 000000000000..1ae049181e83
--- /dev/null
+++ b/arch/ia64/kernel/nr-irqs.c
@@ -0,0 +1,24 @@
+/*
+ * calculate
+ * NR_IRQS = max(IA64_NATIVE_NR_IRQS, XEN_NR_IRQS, FOO_NR_IRQS...)
+ * depending on config.
+ * This must be calculated before processing asm-offset.c.
+ */
+
+#define ASM_OFFSETS_C 1
+
+#include <linux/kbuild.h>
+#include <linux/threads.h>
+#include <asm-ia64/native/irq.h>
+
+void foo(void)
+{
+ union paravirt_nr_irqs_max {
+ char ia64_native_nr_irqs[IA64_NATIVE_NR_IRQS];
+#ifdef CONFIG_XEN
+ char xen_nr_irqs[XEN_NR_IRQS];
+#endif
+ };
+
+ DEFINE(NR_IRQS, sizeof (union paravirt_nr_irqs_max));
+}