x86: init_memory_mapping() trivial cleanups

Impact: cleanup

To reduce the diff between the 32-bit and 64-bit versions of
init_memory_mapping(), fix up all trivial issues.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1236257708-27269-1-git-send-email-penberg@cs.helsinki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 40 insertions, 28 deletions

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index c351456d06dc..ad4e03c2d4df 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -868,11 +868,10 @@ static void __init find_early_table_space(unsigned long end, int use_pse)
 
         table_start >>= PAGE_SHIFT;
         table_end = table_start;
-        table_top = table_start + (tables>>PAGE_SHIFT);
+        table_top = table_start + (tables >> PAGE_SHIFT);
 
         printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n",
-                end, table_start << PAGE_SHIFT,
-                (table_start << PAGE_SHIFT) + tables);
+                end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT);
 }
 
 struct map_range {
@@ -899,8 +898,13 @@ static int save_mr(struct map_range *mr, int nr_range,
         return nr_range;
 }
 
+/*
+ * Setup the direct mapping of the physical memory at PAGE_OFFSET.
+ * This runs before bootmem is initialized and gets pages directly from
+ * the physical memory. To access them they are temporarily mapped.
+ */
 unsigned long __init_refok init_memory_mapping(unsigned long start,
-                                                unsigned long end)
+                                               unsigned long end)
 {
         pgd_t *pgd_base = swapper_pg_dir;
         unsigned long page_size_mask = 0;
@@ -911,7 +915,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
         int nr_range, i;
         int use_pse;
 
-        printk(KERN_INFO "init_memory_mapping: %08lx-%08lx\n", start, end);
+        printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end);
 
 #ifdef CONFIG_DEBUG_PAGEALLOC
         /*
@@ -940,19 +944,19 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
                 __supported_pte_mask |= _PAGE_GLOBAL;
         }
 
-        memset(mr, 0, sizeof(mr));
-        nr_range = 0;
-
         if (use_pse)
                 page_size_mask |= 1 << PG_LEVEL_2M;
 
+        memset(mr, 0, sizeof(mr));
+        nr_range = 0;
+
         /*
          * Don't use a large page for the first 2/4MB of memory
          * because there are often fixed size MTRRs in there
          * and overlapping MTRRs into large pages can cause
          * slowdowns.
          */
-        /* head could not be big page alignment ? */
+        /* head if not big page alignment ? */
         start_pfn = start >> PAGE_SHIFT;
         pos = start_pfn << PAGE_SHIFT;
         if (pos == 0)
@@ -960,14 +964,14 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
         else
                 end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
                                  << (PMD_SHIFT - PAGE_SHIFT);
-        if (end_pfn > (end>>PAGE_SHIFT))
-                end_pfn = end>>PAGE_SHIFT;
+        if (end_pfn > (end >> PAGE_SHIFT))
+                end_pfn = end >> PAGE_SHIFT;
         if (start_pfn < end_pfn) {
                 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
                 pos = end_pfn << PAGE_SHIFT;
         }
 
-        /* big page range */
+        /* big page (2M) range */
         start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
                          << (PMD_SHIFT - PAGE_SHIFT);
         end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
@@ -977,7 +981,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
                 pos = end_pfn << PAGE_SHIFT;
         }
 
-        /* tail is not big page alignment ? */
+        /* tail is not big page (2M) alignment */
         start_pfn = pos>>PAGE_SHIFT;
         end_pfn = end>>PAGE_SHIFT;
         if (start_pfn < end_pfn)
@@ -998,13 +1002,17 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
         }
 
         for (i = 0; i < nr_range; i++)
-                printk(KERN_DEBUG " %08lx - %08lx page %s\n",
-                        mr[i].start, mr[i].end,
-                        (mr[i].page_size_mask & (1<<PG_LEVEL_2M)) ?
-                                  "big page" : "4k");
+                printk(KERN_DEBUG " %010lx - %010lx page %s\n",
+                                mr[i].start, mr[i].end,
+                        (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
+                         (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));
 
         /*
          * Find space for the kernel direct mapping tables.
+         *
+         * Later we should allocate these tables in the local node of the
+         * memory mapped. Unfortunately this is done currently before the
+         * nodes are discovered.
          */
         if (!after_init_bootmem)
                 find_early_table_space(end, use_pse);
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index d325186dd32b..cdb3be1c41f1 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -554,20 +554,25 @@ static void __init find_early_table_space(unsigned long end, int use_pse,
 
         puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
         tables = roundup(puds * sizeof(pud_t), PAGE_SIZE);
+
         if (use_gbpages) {
                 unsigned long extra;
+
                 extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT);
                 pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT;
         } else
                 pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
+
         tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE);
 
         if (use_pse) {
                 unsigned long extra;
+
                 extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
                 ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
         } else
                 ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
+
         tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE);
 
         /*
@@ -647,7 +652,6 @@ static int save_mr(struct map_range *mr, int nr_range,
                    unsigned long start_pfn, unsigned long end_pfn,
                    unsigned long page_size_mask)
 {
-
         if (start_pfn < end_pfn) {
                 if (nr_range >= NR_RANGE_MR)
                         panic("run out of range for init_memory_mapping\n");
@@ -679,13 +683,6 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 
         printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end);
 
-        /*
-         * Find space for the kernel direct mapping tables.
-         *
-         * Later we should allocate these tables in the local node of the
-         * memory mapped. Unfortunately this is done currently before the
-         * nodes are discovered.
-         */
         if (!after_bootmem)
                 init_gbpages();
 
@@ -709,7 +706,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
         memset(mr, 0, sizeof(mr));
         nr_range = 0;
 
-        /* head if not big page alignment ?*/
+        /* head if not big page alignment ? */
         start_pfn = start >> PAGE_SHIFT;
         pos = start_pfn << PAGE_SHIFT;
         end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
@@ -721,7 +718,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
                 pos = end_pfn << PAGE_SHIFT;
         }
 
-        /* big page (2M) range*/
+        /* big page (2M) range */
         start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
                          << (PMD_SHIFT - PAGE_SHIFT);
         end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
@@ -769,7 +766,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
                 /* move it */
                 old_start = mr[i].start;
                 memmove(&mr[i], &mr[i+1],
-                         (nr_range - 1 - i) * sizeof (struct map_range));
+                        (nr_range - 1 - i) * sizeof(struct map_range));
                 mr[i--].start = old_start;
                 nr_range--;
         }
@@ -780,6 +777,13 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
                         (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
                          (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));
 
+        /*
+         * Find space for the kernel direct mapping tables.
+         *
+         * Later we should allocate these tables in the local node of the
+         * memory mapped. Unfortunately this is done currently before the
+         * nodes are discovered.
+         */
         if (!after_bootmem)
                 find_early_table_space(end, use_pse, use_gbpages);