From: Jan Beulich <jbeulich@novell.com>
Date: Thu, 7 Dec 2006 01:14:09 +0000 (+0100)
Subject: [PATCH] x86-64: adjust pmd_bad()
X-Git-Tag: v2.6.20-rc1~145^2^2~8^2~55
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eab724e5df17af0ed0dac03da8f75aa336c31206;p=linux-2.6

[PATCH] x86-64: adjust pmd_bad()

Make pmd_bad() symmetrical to pgd_bad() and pud_bad(). At once,
simplify them all.

TBD: tighten down the checks again as suggested by Hugh D.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
---

diff --git a/include/asm-x86_64/pgtable.h b/include/asm-x86_64/pgtable.h
index 0555c1c4d8..59901c690a 100644
--- a/include/asm-x86_64/pgtable.h
+++ b/include/asm-x86_64/pgtable.h
@@ -221,20 +221,19 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long
 #define __S110	PAGE_SHARED_EXEC
 #define __S111	PAGE_SHARED_EXEC
 
-static inline unsigned long pgd_bad(pgd_t pgd) 
-{ 
-       unsigned long val = pgd_val(pgd);
-       val &= ~PTE_MASK; 
-       val &= ~(_PAGE_USER | _PAGE_DIRTY); 
-       return val & ~(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED);      
-} 
+static inline unsigned long pgd_bad(pgd_t pgd)
+{
+	return pgd_val(pgd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
+}
 
 static inline unsigned long pud_bad(pud_t pud)
 {
-       unsigned long val = pud_val(pud);
-       val &= ~PTE_MASK;
-       val &= ~(_PAGE_USER | _PAGE_DIRTY);
-       return val & ~(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED);
+	return pud_val(pud) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
+}
+
+static inline unsigned long pmd_bad(pmd_t pmd)
+{
+	return pmd_val(pmd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
 }
 
 #define pte_none(x)	(!pte_val(x))
@@ -347,7 +346,6 @@ static inline int pmd_large(pmd_t pte) {
 #define pmd_none(x)	(!pmd_val(x))
 #define pmd_present(x)	(pmd_val(x) & _PAGE_PRESENT)
 #define pmd_clear(xp)	do { set_pmd(xp, __pmd(0)); } while (0)
-#define	pmd_bad(x)	((pmd_val(x) & (~PTE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE )
 #define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot)))
 #define pmd_pfn(x)  ((pmd_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)