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authorDavid Woodhouse <dwmw2@shinybook.infradead.org>2006-04-29 01:42:26 +0100
committerDavid Woodhouse <dwmw2@infradead.org>2006-04-29 01:42:26 +0100
commitd6754b401a15eaa16492ea5dbaa4826361d3f411 (patch)
tree032f067d3af458527d903a7653885404ed82431e /include/asm-i386
parentacc429a517bd11fdcac9bea97d082d26231beb92 (diff)
parent693f7d362055261882659475d2ef022e32edbff1 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'include/asm-i386')
-rw-r--r--include/asm-i386/pgtable-2level.h3
-rw-r--r--include/asm-i386/pgtable-3level.h20
-rw-r--r--include/asm-i386/pgtable.h4
-rw-r--r--include/asm-i386/unistd.h3
4 files changed, 26 insertions, 4 deletions
diff --git a/include/asm-i386/pgtable-2level.h b/include/asm-i386/pgtable-2level.h
index 27bde973abc..2756d4b04c2 100644
--- a/include/asm-i386/pgtable-2level.h
+++ b/include/asm-i386/pgtable-2level.h
@@ -18,6 +18,9 @@
#define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
+#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
+#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
+
#define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte_low, 0))
#define pte_same(a, b) ((a).pte_low == (b).pte_low)
#define pte_page(x) pfn_to_page(pte_pfn(x))
diff --git a/include/asm-i386/pgtable-3level.h b/include/asm-i386/pgtable-3level.h
index 36a5aa63cbb..dccb1b3337a 100644
--- a/include/asm-i386/pgtable-3level.h
+++ b/include/asm-i386/pgtable-3level.h
@@ -85,6 +85,26 @@ static inline void pud_clear (pud_t * pud) { }
#define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
pmd_index(address))
+/*
+ * For PTEs and PDEs, we must clear the P-bit first when clearing a page table
+ * entry, so clear the bottom half first and enforce ordering with a compiler
+ * barrier.
+ */
+static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+ ptep->pte_low = 0;
+ smp_wmb();
+ ptep->pte_high = 0;
+}
+
+static inline void pmd_clear(pmd_t *pmd)
+{
+ u32 *tmp = (u32 *)pmd;
+ *tmp = 0;
+ smp_wmb();
+ *(tmp + 1) = 0;
+}
+
static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
pte_t res;
diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h
index 248bd80a69c..09697fec3d2 100644
--- a/include/asm-i386/pgtable.h
+++ b/include/asm-i386/pgtable.h
@@ -203,12 +203,10 @@ extern unsigned long long __PAGE_KERNEL, __PAGE_KERNEL_EXEC;
extern unsigned long pg0[];
#define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE))
-#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
/* To avoid harmful races, pmd_none(x) should check only the lower when PAE */
#define pmd_none(x) (!(unsigned long)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) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
@@ -267,7 +265,7 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long
pte_t pte;
if (full) {
pte = *ptep;
- *ptep = __pte(0);
+ pte_clear(mm, addr, ptep);
} else {
pte = ptep_get_and_clear(mm, addr, ptep);
}
diff --git a/include/asm-i386/unistd.h b/include/asm-i386/unistd.h
index d81d6cfc1bb..eb4b152c82f 100644
--- a/include/asm-i386/unistd.h
+++ b/include/asm-i386/unistd.h
@@ -321,8 +321,9 @@
#define __NR_splice 313
#define __NR_sync_file_range 314
#define __NR_tee 315
+#define __NR_vmsplice 316
-#define NR_syscalls 316
+#define NR_syscalls 317
/*
* user-visible error numbers are in the range -1 - -128: see