On 02/21/2019 01:51 PM, Michael Ellerman wrote:

Christophe Leroy [off-list ref] writes:

quoted

Now that mmu_mapin_ram() is able to handle other blocks
than the one starting at 0, the WII can use it for all
its blocks.

Signed-off-by: Christophe Leroy <redacted>
---
  arch/powerpc/mm/pgtable_32.c | 27 +++++++++------------------
  1 file changed, 9 insertions(+), 18 deletions(-)

diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index b4858818523f..2bf9bf8867d4 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c

@@ -254,26 +254,17 @@ static void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
  
  void __init mapin_ram(void)
  {
-	unsigned long s, top;
-
-#ifndef CONFIG_WII
-	top = total_lowmem;
-	s = mmu_mapin_ram(0, top);
-	__mapin_ram_chunk(s, top);
-#else
-	if (!wii_hole_size) {
-		s = mmu_mapin_ram(0, total_lowmem);
-		__mapin_ram_chunk(s, total_lowmem);
-	} else {
-		top = wii_hole_start;
-		s = mmu_mapin_ram(0, top);
-		__mapin_ram_chunk(s, top);
+	struct memblock_region *reg;
+
+	for_each_memblock(memory, reg) {
+		unsigned long base = reg->base;
+		unsigned long top = min(base + reg->size, (unsigned long)total_lowmem);

This gives me:

In file included from ../arch/powerpc/mm/pgtable_32.c:22:
../arch/powerpc/mm/pgtable_32.c: In function ‘mapin_ram’:
../include/linux/kernel.h:846:29: error: comparison of distinct pointer types lacks a cast [-Werror]
    (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                              ^~
../include/linux/kernel.h:860:4: note: in expansion of macro ‘__typecheck’
    (__typecheck(x, y) && __no_side_effects(x, y))
     ^~~~~~~~~~~
../include/linux/kernel.h:870:24: note: in expansion of macro ‘__safe_cmp’
   __builtin_choose_expr(__safe_cmp(x, y), \
                         ^~~~~~~~~~
../include/linux/kernel.h:879:19: note: in expansion of macro ‘__careful_cmp’
  #define min(x, y) __careful_cmp(x, y, <)
                    ^~~~~~~~~~~~~
../arch/powerpc/mm/pgtable_32.c:261:23: note: in expansion of macro ‘min’
    unsigned long top = min(base + reg->size, (unsigned long)total_lowmem);
                        ^~~
cc1: all warnings being treated as errors
../scripts/Makefile.build:276: recipe for target 'arch/powerpc/mm/pgtable_32.o' failed


For 44x/bamboo_defconfig.

The patch below should make it. Tested it on half a dozen of config.

diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 2bf9bf8867d4..c4b0eb51f6d8 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c

@@ -257,8 +257,8 @@ void __init mapin_ram(void)
  	struct memblock_region *reg;

  	for_each_memblock(memory, reg) {
-		unsigned long base = reg->base;
-		unsigned long top = min(base + reg->size, (unsigned long)total_lowmem);
+		phys_addr_t base = reg->base;
+		phys_addr_t top = min(base + reg->size, total_lowmem);

  		if (base >= top)
  			continue;

I'll send out v5, hope it'll be the last one :(

Christophe