linux-kernel - [Patch] arch/um/kernel/mem.c: remove arch

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Message-Id: <20080424.143625.40747652.xiyou.wangcong@gmail.com>
Date:	Thu, 24 Apr 2008 14:36:25 +0800 (CST)
From:	WANG Cong <xiyou.wangcong@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...l.org, jdike@...toit.com,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: [Patch] arch/um/kernel/mem.c: remove arch_validate()


Remove arch_validate(), because no one uses it.
Remove useless macro HAVE_ARCH_VALIDATE.
Make the variable 'empty_bad_page' static.

Compile testing passed.

Cc: Jeff Dike <jdike@...toit.com>
Signed-off-by: WANG Cong <wangcong@...ux.org>

---
 arch/um/kernel/ksyms.c |    1 -
 arch/um/kernel/mem.c   |   33 +--------------------------------
 include/asm-um/page.h  |    3 ---
 3 files changed, 1 insertions(+), 36 deletions(-)

diff --git a/arch/um/kernel/ksyms.c b/arch/um/kernel/ksyms.c
index 66e2a30..cc1b5f1 100644
--- a/arch/um/kernel/ksyms.c
+++ b/arch/um/kernel/ksyms.c
@@ -18,7 +18,6 @@ EXPORT_SYMBOL(get_signals);
 EXPORT_SYMBOL(kernel_thread);
 EXPORT_SYMBOL(sys_waitpid);
 EXPORT_SYMBOL(flush_tlb_range);
-EXPORT_SYMBOL(arch_validate);
 
 EXPORT_SYMBOL(high_physmem);
 EXPORT_SYMBOL(empty_zero_page);
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 2eea1ff..88fc1c8 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -21,7 +21,7 @@
 /* allocated in paging_init, zeroed in mem_init, and unchanged thereafter */
 unsigned long *empty_zero_page = NULL;
 /* allocated in paging_init and unchanged thereafter */
-unsigned long *empty_bad_page = NULL;
+static unsigned long *empty_bad_page = NULL;
 
 /*
  * Initialized during boot, and readonly for initializing page tables
@@ -240,37 +240,6 @@ void __init paging_init(void)
 #endif
 }
 
-struct page *arch_validate(struct page *page, gfp_t mask, int order)
-{
-	unsigned long addr, zero = 0;
-	int i;
-
- again:
-	if (page == NULL)
-		return page;
-	if (PageHighMem(page))
-		return page;
-
-	addr = (unsigned long) page_address(page);
-	for (i = 0; i < (1 << order); i++) {
-		current->thread.fault_addr = (void *) addr;
-		if (__do_copy_to_user((void __user *) addr, &zero,
-				     sizeof(zero),
-				     &current->thread.fault_addr,
-				     &current->thread.fault_catcher)) {
-			if (!(mask & __GFP_WAIT))
-				return NULL;
-			else break;
-		}
-		addr += PAGE_SIZE;
-	}
-
-	if (i == (1 << order))
-		return page;
-	page = alloc_pages(mask, order);
-	goto again;
-}
-
 /*
  * This can't do anything because nothing in the kernel image can be freed
  * since it's not in kernel physical memory.
diff --git a/include/asm-um/page.h b/include/asm-um/page.h
index 381f96b..4b489e3 100644
--- a/include/asm-um/page.h
+++ b/include/asm-um/page.h
@@ -114,9 +114,6 @@ extern unsigned long uml_physmem;
 #define pfn_valid(pfn) ((pfn) < max_mapnr)
 #define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
 
-extern struct page *arch_validate(struct page *page, gfp_t mask, int order);
-#define HAVE_ARCH_VALIDATE
-
 #include <asm-generic/memory_model.h>
 #include <asm-generic/page.h>
 
-- 
1.5.2.4

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