powerpc/64s: Add EX_SIZE definition for paca exception save areas

Rather than open-coding it 4 times.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Move __ASSEMBLY__ guards into head-64.h where they're really needed]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/exception-64s.h

@@ -36,6 +36,7 @@
  */
 #include <asm/head-64.h>
 
+/* PACA save area offsets (exgen, exmc, etc) */
 #define EX_R9		0
 #define EX_R10		8
 #define EX_R11		16
@@ -51,6 +52,8 @@
 #define EX_PPR		88	/* SMT thread status register (priority) */
 #define EX_CTR		96
 
+#define EX_SIZE		13	/* size in u64 units */
+
 #ifdef CONFIG_RELOCATABLE
 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)			\
 	mfspr	r11,SPRN_##h##SRR0;	/* save SRR0 */			\

arch/powerpc/include/asm/head-64.h

@@ -3,6 +3,7 @@
 
 #include <asm/cache.h>
 
+#ifdef __ASSEMBLY__
 /*
  * We can't do CPP stringification and concatination directly into the section
  * name for some reason, so these macros can do it for us.
@@ -415,4 +416,6 @@ end_##sname:
 	EXC_COMMON_BEGIN(name);						\
 	STD_EXCEPTION_COMMON(realvec + 0x2, name, hdlr);		\
 
+#endif /* __ASSEMBLY__ */
+
 #endif	/* _ASM_POWERPC_HEAD_64_H */

arch/powerpc/include/asm/paca.h

@@ -21,7 +21,11 @@
 #include <asm/lppaca.h>
 #include <asm/mmu.h>
 #include <asm/page.h>
+#ifdef CONFIG_PPC_BOOK3E
 #include <asm/exception-64e.h>
+#else
+#include <asm/exception-64s.h>
+#endif
 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 #include <asm/kvm_book3s_asm.h>
 #endif
@@ -98,8 +102,8 @@ struct paca_struct {
 	 * Now, starting in cacheline 2, the exception save areas
 	 */
 	/* used for most interrupts/exceptions */
-	u64 exgen[13] __attribute__((aligned(0x80)));
-	u64 exslb[13];		/* used for SLB/segment table misses
+	u64 exgen[EX_SIZE] __attribute__((aligned(0x80)));
+	u64 exslb[EX_SIZE];	/* used for SLB/segment table misses
  				 * on the linear mapping */
 	/* SLB related definitions */
 	u16 vmalloc_sllp;
@@ -183,8 +187,8 @@ struct paca_struct {
 
 #ifdef CONFIG_PPC_STD_MMU_64
 	/* Non-maskable exceptions that are not performance critical */
-	u64 exnmi[13];		/* used for system reset (nmi) */
-	u64 exmc[13];		/* used for machine checks */
+	u64 exnmi[EX_SIZE];	/* used for system reset (nmi) */
+	u64 exmc[EX_SIZE];	/* used for machine checks */
 #endif
 #ifdef CONFIG_PPC_BOOK3S_64
 	/* Exclusive stacks for system reset and machine check exception. */