linux-kernel - [RFT/PATCH] x86: Unify kernel_physical_mapping

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Date:	Wed, 24 Feb 2010 17:04:47 +0200 (EET)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	mingo@...e.hu
cc:	x86@...nel.org, linux-kernel@...r.kernel.org, yinghai@...nel.org,
	kamezawa.hiroyu@...fujitsu.com
Subject: [RFT/PATCH] x86: Unify kernel_physical_mapping_init() API

From: Pekka Enberg <penberg@...helsinki.fi>

This patch changes the 32-bit version of kernel_physical_mapping_init() to
return the last mapped address like the 64-bit one so that we can unify the
call-site in init_memory_mapping().

Cc: Yinghai Lu <yinghai@...nel.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
Note: I have only tested this on VirtualBox which is why I tagged the patch as
RFT.

  arch/x86/mm/init.c    |    7 -------
  arch/x86/mm/init_32.c |    8 +++++---
  2 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index d406c52..e71c5cb 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -266,16 +266,9 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
  	if (!after_bootmem)
  		find_early_table_space(end, use_pse, use_gbpages);

-#ifdef CONFIG_X86_32
-	for (i = 0; i < nr_range; i++)
-		kernel_physical_mapping_init(mr[i].start, mr[i].end,
-					     mr[i].page_size_mask);
-	ret = end;
-#else /* CONFIG_X86_64 */
  	for (i = 0; i < nr_range; i++)
  		ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
  						   mr[i].page_size_mask);
-#endif

  #ifdef CONFIG_X86_32
  	early_ioremap_page_table_range_init();
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 9a0c258..2226f2c 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -241,6 +241,7 @@ kernel_physical_mapping_init(unsigned long start,
  			     unsigned long page_size_mask)
  {
  	int use_pse = page_size_mask == (1<<PG_LEVEL_2M);
+	unsigned long last_map_addr = end;
  	unsigned long start_pfn, end_pfn;
  	pgd_t *pgd_base = swapper_pg_dir;
  	int pgd_idx, pmd_idx, pte_ofs;
@@ -341,9 +342,10 @@ repeat:
  					prot = PAGE_KERNEL_EXEC;

  				pages_4k++;
-				if (mapping_iter == 1)
+				if (mapping_iter == 1) {
  					set_pte(pte, pfn_pte(pfn, init_prot));
-				else
+					last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE;
+				} else
  					set_pte(pte, pfn_pte(pfn, prot));
  			}
  		}
@@ -368,7 +370,7 @@ repeat:
  		mapping_iter = 2;
  		goto repeat;
  	}
-	return 0;
+	return last_map_addr;
  }

  pte_t *kmap_pte;
-- 
1.5.6.4

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