powerpc/fsl-booke: Don't hard-code size of struct tlbcam

Some assembly code in head_fsl_booke.S hard-coded the size of struct tlbcam
to 20 when it indexed the TLBCAM table.  Anyone changing the size of struct
tlbcam would not know to expect that.

The kernel already has a system to get the size of C structures into
assembly language files, asm-offsets, so let's use it.

The definition of the struct gets moved to a header, so that asm-offsets.c
can include it.

Signed-off-by: Trent Piepho <tpiepho@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

4 files changed, 18 insertions, 8 deletions

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 661d07d2146b..06958da94f17 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -56,6 +56,10 @@
 #include "head_booke.h"
 #endif
 
+#if defined(CONFIG_FSL_BOOKE)
+#include "../mm/mmu_decl.h"
+#endif
+
 int main(void)
 {
         DEFINE(THREAD, offsetof(struct task_struct, thread));
@@ -384,6 +388,9 @@ int main(void)
         DEFINE(PGD_T_LOG2, PGD_T_LOG2);
         DEFINE(PTE_T_LOG2, PTE_T_LOG2);
 #endif
+#ifdef CONFIG_FSL_BOOKE
+        DEFINE(TLBCAM_SIZE, sizeof(struct tlbcam));
+#endif
 
         return 0;
 }
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 11b549acc034..805f28d30e49 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -909,7 +909,7 @@ KernelSPE:
 _GLOBAL(loadcam_entry)
         lis     r4,TLBCAM@ha
         addi    r4,r4,TLBCAM@l
-        mulli   r5,r3,20
+        mulli   r5,r3,TLBCAM_SIZE
         add     r3,r5,r4
         lwz     r4,0(r3)
         mtspr   SPRN_MAS0,r4
diff --git a/arch/powerpc/mm/fsl_booke_mmu.c b/arch/powerpc/mm/fsl_booke_mmu.c
index 23cee39534fd..c9ee59af1006 100644
--- a/arch/powerpc/mm/fsl_booke_mmu.c
+++ b/arch/powerpc/mm/fsl_booke_mmu.c
@@ -61,13 +61,7 @@ static unsigned long __cam0, __cam1, __cam2;
 
 #define NUM_TLBCAMS     (16)
 
-struct tlbcam {
-        u32     MAS0;
-        u32     MAS1;
-        u32     MAS2;
-        u32     MAS3;
-        u32     MAS7;
-} TLBCAM[NUM_TLBCAMS];
+struct tlbcam TLBCAM[NUM_TLBCAMS];
 
 struct tlbcamrange {
         unsigned long start;
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index 4314b39b6faf..6f6ee62c2a04 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -75,6 +75,15 @@ extern void _tlbia(void);
 #endif /* CONFIG_PPC_MMU_NOHASH */
 
 #ifdef CONFIG_PPC32
+
+struct tlbcam {
+        u32     MAS0;
+        u32     MAS1;
+        u32     MAS2;
+        u32     MAS3;
+        u32     MAS7;
+};
+
 extern void mapin_ram(void);
 extern int map_page(unsigned long va, phys_addr_t pa, int flags);
 extern void setbat(int index, unsigned long virt, phys_addr_t phys,