[PARISC] Fix kernel panic in check_ivt

check_ivt had some seriously broken code wrt function pointers on
parisc64. Instead of referencing the hpmc code via a function pointer,
export symbols and reference it as a const array.

Thanks to jda for pointing out the broken 64-bit func ptr handling.

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

2 files changed, 5 insertions, 7 deletions

diff --git a/arch/parisc/kernel/hpmc.S b/arch/parisc/kernel/hpmc.S
index d8baa158d8a0..43b41df0b541 100644
--- a/arch/parisc/kernel/hpmc.S
+++ b/arch/parisc/kernel/hpmc.S
@@ -295,8 +295,5 @@ os_hpmc_6:
         b .
         nop
 ENDPROC(os_hpmc)
-
-        /* this label used to compute os_hpmc checksum */
-ENTRY(os_hpmc_end)
-
+ENTRY(os_hpmc_end)      /* this label used to compute os_hpmc checksum */
         nop
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index 0ba1d3dbca2a..c3ec9f1ec0f3 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -802,13 +802,14 @@ void handle_interruption(int code, struct pt_regs *regs)
 
 int __init check_ivt(void *iva)
 {
+        extern const u32 os_hpmc[];
+        extern const u32 os_hpmc_end[];
+
         int i;
         u32 check = 0;
         u32 *ivap;
         u32 *hpmcp;
         u32 length;
-        extern void os_hpmc(void);
-        extern void os_hpmc_end(void);
 
         if (strcmp((char *)iva, "cows can fly"))
                 return -1;
@@ -820,7 +821,7 @@ int __init check_ivt(void *iva)
 
         /* Compute Checksum for HPMC handler */
 
-        length = (u32)((unsigned long)os_hpmc_end - (unsigned long)os_hpmc);
+        length = os_hpmc_end - os_hpmc;
         ivap[7] = length;
 
         hpmcp = (u32 *)os_hpmc;