Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ee01f1122ceb02a2c9b7142c5dd17b49e59ba774
Commit:     ee01f1122ceb02a2c9b7142c5dd17b49e59ba774
Parent:     1a4872529e13265d05ffae75b8d09697540016d2
Author:     Ingo Molnar <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 13:34:09 2008 +0100
Committer:  Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 13:34:09 2008 +0100

    x86: init memory debugging
    
    debug incorrect/late access to init memory, by permanently unmapping
    the init memory ranges. Depends on CONFIG_DEBUG_PAGEALLOC=y.
    
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
---
 arch/x86/mm/init_32.c |   11 +++++++++++
 arch/x86/mm/init_64.c |   11 +++++++++++
 2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index a72737c..8d7f723 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -783,6 +783,16 @@ void free_init_pages(char *what, unsigned long begin, 
unsigned long end)
 {
        unsigned long addr;
 
+#ifdef CONFIG_DEBUG_PAGEALLOC
+       /*
+        * If debugging page accesses then do not free this memory but
+        * mark them not present - any buggy init-section access will
+        * create a kernel page fault:
+        */
+       printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
+               begin, PAGE_ALIGN(end));
+       set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
+#else
        /*
         * We just marked the kernel text read only above, now that
         * we are going to free part of that, we need to make that
@@ -798,6 +808,7 @@ void free_init_pages(char *what, unsigned long begin, 
unsigned long end)
                totalram_pages++;
        }
        printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
+#endif
 }
 
 void free_initmem(void)
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index f51180c..e0c1e98 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -550,6 +550,16 @@ void free_init_pages(char *what, unsigned long begin, 
unsigned long end)
        if (begin >= end)
                return;
 
+       /*
+        * If debugging page accesses then do not free this memory but
+        * mark them not present - any buggy init-section access will
+        * create a kernel page fault:
+        */
+#ifdef CONFIG_DEBUG_PAGEALLOC
+       printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
+               begin, PAGE_ALIGN(end));
+       set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
+#else
        printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
        for (addr = begin; addr < end; addr += PAGE_SIZE) {
                ClearPageReserved(virt_to_page(addr));
@@ -575,6 +585,7 @@ void free_init_pages(char *what, unsigned long begin, 
unsigned long end)
                set_memory_nx(begin, (end - begin)/PAGE_SIZE);
        }
 #endif
+#endif
 }
 
 void free_initmem(void)
-
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Reply via email to