[PATCH] powerpc: Remove calculation of io hole

In mm_init_ppc64() we calculate the location of the "IO hole", but then
no one ever looks at the value. So don't bother.

That's actually all mm_init_ppc64() does, so get rid of it too.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index f96c49b03ba05f9cf58afe80649bdafb5f129c5d..2f3fdad35594335818fc2842aac001506b26029f 100644 (file)
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -497,8 +497,6 @@ void __init setup_system(void)
 #endif
        printk("-----------------------------------------------------\n");
 
-       mm_init_ppc64();
-
        DBG(" <- setup_system()\n");
 }
 

diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index 81cfb0c2ec58bf5bd1d056b48206b551b1aad935..5d4733d6180585f7b6714870ef1d2e69bad45d75 100644 (file)
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -84,54 +84,6 @@
 /* max amount of RAM to use */
 unsigned long __max_memory;
 
-/* info on what we think the IO hole is */
-unsigned long  io_hole_start;
-unsigned long  io_hole_size;
-
-/*
- * Do very early mm setup.
- */
-void __init mm_init_ppc64(void)
-{
-#ifndef CONFIG_PPC_ISERIES
-       unsigned long i;
-#endif
-
-       ppc64_boot_msg(0x100, "MM Init");
-
-       /* This is the story of the IO hole... please, keep seated,
-        * unfortunately, we are out of oxygen masks at the moment.
-        * So we need some rough way to tell where your big IO hole
-        * is. On pmac, it's between 2G and 4G, on POWER3, it's around
-        * that area as well, on POWER4 we don't have one, etc...
-        * We need that as a "hint" when sizing the TCE table on POWER3
-        * So far, the simplest way that seem work well enough for us it
-        * to just assume that the first discontinuity in our physical
-        * RAM layout is the IO hole. That may not be correct in the future
-        * (and isn't on iSeries but then we don't care ;)
-        */
-
-#ifndef CONFIG_PPC_ISERIES
-       for (i = 1; i < lmb.memory.cnt; i++) {
-               unsigned long base, prevbase, prevsize;
-
-               prevbase = lmb.memory.region[i-1].base;
-               prevsize = lmb.memory.region[i-1].size;
-               base = lmb.memory.region[i].base;
-               if (base > (prevbase + prevsize)) {
-                       io_hole_start = prevbase + prevsize;
-                       io_hole_size = base  - (prevbase + prevsize);
-                       break;
-               }
-       }
-#endif /* CONFIG_PPC_ISERIES */
-       if (io_hole_start)
-               printk("IO Hole assumed to be %lx -> %lx\n",
-                      io_hole_start, io_hole_start + io_hole_size - 1);
-
-       ppc64_boot_msg(0x100, "MM Init Done");
-}
-
 void free_initmem(void)
 {
        unsigned long addr;

diff --git a/include/asm-powerpc/lmb.h b/include/asm-powerpc/lmb.h
index 377ac1b23aa3238bb7216fd14b22766dc77e3d35..0c5880f702254338d0dee571b17a64a5fdbe99c4 100644 (file)
--- a/include/asm-powerpc/lmb.h
+++ b/include/asm-powerpc/lmb.h
@@ -54,8 +54,6 @@ extern void __init lmb_enforce_memory_limit(unsigned long memory_limit);
 
 extern void lmb_dump_all(void);
 
-extern unsigned long io_hole_start;
-
 static inline unsigned long
 lmb_size_bytes(struct lmb_region *type, unsigned long region_nr)
 {

diff --git a/include/asm-powerpc/mmu.h b/include/asm-powerpc/mmu.h
index b0b9a3f8cdc2dad760ca3ba00eaaad0935894ebc..31f721994bd894265d73f398560e6028ad84640e 100644 (file)
--- a/include/asm-powerpc/mmu.h
+++ b/include/asm-powerpc/mmu.h
@@ -236,7 +236,6 @@ extern void htab_initialize_secondary(void);
 extern void hpte_init_native(void);
 extern void hpte_init_lpar(void);
 extern void hpte_init_iSeries(void);
-extern void mm_init_ppc64(void);
 
 extern long pSeries_lpar_hpte_insert(unsigned long hpte_group,
                                     unsigned long va, unsigned long prpn,