[PATCH 6/9] pagemap: give -1's a name

[Dave Hansen <haveblue@us.ibm.com>]

-1 is a magic number in /proc/$pid/pagemap.  It means that
there was no pte present for a particular page.  We're
going to be refining that a bit shortly, so give this a
real name for now.

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
---

 lxc-dave/fs/proc/task_mmu.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -puN fs/proc/task_mmu.c~give_-1s_a_name fs/proc/task_mmu.c
--- lxc/fs/proc/task_mmu.c~give_-1s_a_name	2007-08-22 16:16:53.000000000 -0700
+++ lxc-dave/fs/proc/task_mmu.c	2007-08-22 16:16:53.000000000 -0700
@@ -509,6 +509,7 @@ struct pagemapread {
 };
 
 #define PM_ENTRY_BYTES sizeof(unsigned long)
+#define PM_NOT_PRESENT ((unsigned long)-1)
 
 static int add_to_pagemap(unsigned long addr, unsigned long pfn,
 			  struct pagemapread *pm)
@@ -533,7 +534,7 @@ static int pagemap_pte_range(pmd_t *pmd,
 		if (addr < pm->next)
 			continue;
 		if (!pte_present(*pte))
-			err = add_to_pagemap(addr, -1, pm);
+			err = add_to_pagemap(addr, PM_NOT_PRESENT, pm);
 		else
 			err = add_to_pagemap(addr, pte_pfn(*pte), pm);
 		if (err)
_

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