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Subject[PATCH -v2 05/13] x86, mm: Find early page table only one time
Date
Should not do that in every calling of init_memory_mapping.
Actually in early time, only need do once.

Also move down early_memtest.

-v2: fix one early_memtest with 32bit by passing max_pfn_mapped instead.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/mm/init.c | 72 ++++++++++++++++++++++++++-------------------------
1 files changed, 37 insertions(+), 35 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index cca9b7d..0ada295 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -37,7 +37,7 @@ struct map_range {

static int page_size_mask;

-static void __init find_early_table_space(struct map_range *mr,
+static void __init find_early_table_space(unsigned long begin,
unsigned long end)
{
unsigned long puds, pmds, ptes, tables, start = 0, good_end = end;
@@ -64,8 +64,8 @@ static void __init find_early_table_space(struct map_range *mr,
extra += PMD_SIZE;
#endif
/* The first 2/4M doesn't use large pages. */
- if (mr->start < PMD_SIZE)
- extra += mr->end - mr->start;
+ if (begin < PMD_SIZE)
+ extra += (PMD_SIZE - begin) >> PAGE_SHIFT;

ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
} else
@@ -265,16 +265,6 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
nr_range = 0;
nr_range = split_mem_range(mr, nr_range, 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)
- find_early_table_space(&mr[0], end);
-
for (i = 0; i < nr_range; i++)
ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
mr[i].page_size_mask);
@@ -287,6 +277,36 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,

__flush_tlb_all();

+ return ret >> PAGE_SHIFT;
+}
+
+void __init init_mem_mapping(void)
+{
+ probe_page_size_mask();
+
+ /*
+ * 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.
+ */
+#ifdef CONFIG_X86_64
+ find_early_table_space(0, max_pfn<<PAGE_SHIFT);
+#else
+ find_early_table_space(0, max_low_pfn<<PAGE_SHIFT);
+#endif
+ max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
+ max_pfn_mapped = max_low_pfn_mapped;
+
+#ifdef CONFIG_X86_64
+ if (max_pfn > max_low_pfn) {
+ max_pfn_mapped = init_memory_mapping(1UL<<32,
+ max_pfn<<PAGE_SHIFT);
+ /* can we preseve max_low_pfn ?*/
+ max_low_pfn = max_pfn;
+ }
+#endif
/*
* Reserve the kernel pagetable pages we used (pgt_buf_start -
* pgt_buf_end) and free the other ones (pgt_buf_end - pgt_buf_top)
@@ -302,32 +322,14 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
* RO all the pagetable pages, including the ones that are beyond
* pgt_buf_end at that time.
*/
- if (!after_bootmem && pgt_buf_end > pgt_buf_start)
+ if (pgt_buf_end > pgt_buf_start)
x86_init.mapping.pagetable_reserve(PFN_PHYS(pgt_buf_start),
PFN_PHYS(pgt_buf_end));

- if (!after_bootmem)
- early_memtest(start, end);
+ /* stop the wrong using */
+ pgt_buf_top = 0;

- return ret >> PAGE_SHIFT;
-}
-
-void __init init_mem_mapping(void)
-{
- probe_page_size_mask();
-
- /* max_pfn_mapped is updated here */
- max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
- max_pfn_mapped = max_low_pfn_mapped;
-
-#ifdef CONFIG_X86_64
- if (max_pfn > max_low_pfn) {
- max_pfn_mapped = init_memory_mapping(1UL<<32,
- max_pfn<<PAGE_SHIFT);
- /* can we preseve max_low_pfn ?*/
- max_low_pfn = max_pfn;
- }
-#endif
+ early_memtest(0, max_pfn_mapped << PAGE_SHIFT);
}

/*
--
1.7.7


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