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Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

Browse Source 
* 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  resource: Fix broken indentation
  resource: Fix generic page_is_ram() for partial RAM pages
  x86, paravirt: Remove kmap_atomic_pte paravirt op.
  x86, vmi: Disable highmem PTE allocation even when CONFIG_HIGHPTE=y
  x86, xen: Disable highmem PTE allocation even when CONFIG_HIGHPTE=y
This commit is contained in:
Linus Torvalds 2010-03-03 09:11:02 -08:00
commit 2a32f2db13
9 changed files with 21 additions and 76 deletions
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4
arch/x86/include/asm/highmem.h
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@ -66,10 +66,6 @@ void *kmap_atomic_pfn(unsigned long pfn, enum km_type type);
void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot);
struct page *kmap_atomic_to_page(void *ptr);
#ifndef CONFIG_PARAVIRT
#define kmap_atomic_pte(page, type) kmap_atomic(page, type)
#endif
#define flush_cache_kmaps() do { } while (0)
extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn,

9
arch/x86/include/asm/paravirt.h
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@ -435,15 +435,6 @@ static inline void paravirt_release_pud(unsigned long pfn)
PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
}
#ifdef CONFIG_HIGHPTE
static inline void *kmap_atomic_pte(struct page *page, enum km_type type)
{
unsigned long ret;
ret = PVOP_CALL2(unsigned long, pv_mmu_ops.kmap_atomic_pte, page, type);
return (void *)ret;
}
#endif
static inline void pte_update(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{

4
arch/x86/include/asm/paravirt_types.h
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@ -304,10 +304,6 @@ struct pv_mmu_ops {
#endif /* PAGETABLE_LEVELS == 4 */
#endif /* PAGETABLE_LEVELS >= 3 */
#ifdef CONFIG_HIGHPTE
void *(*kmap_atomic_pte)(struct page *page, enum km_type type);
#endif
struct pv_lazy_ops lazy_mode;
/* dom0 ops */

4
arch/x86/include/asm/pgtable_32.h
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@ -54,10 +54,10 @@ extern void set_pmd_pfn(unsigned long, unsigned long, pgprot_t);
in_irq() ? KM_IRQ_PTE : \
KM_PTE0)
#define pte_offset_map(dir, address) \
((pte_t *)kmap_atomic_pte(pmd_page(*(dir)), __KM_PTE) + \
((pte_t *)kmap_atomic(pmd_page(*(dir)), __KM_PTE) + \
pte_index((address)))
#define pte_offset_map_nested(dir, address) \
((pte_t *)kmap_atomic_pte(pmd_page(*(dir)), KM_PTE1) + \
((pte_t *)kmap_atomic(pmd_page(*(dir)), KM_PTE1) + \
pte_index((address)))
#define pte_unmap(pte) kunmap_atomic((pte), __KM_PTE)
#define pte_unmap_nested(pte) kunmap_atomic((pte), KM_PTE1)

4
arch/x86/kernel/paravirt.c
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@ -428,10 +428,6 @@ struct pv_mmu_ops pv_mmu_ops = {
.ptep_modify_prot_start = __ptep_modify_prot_start,
.ptep_modify_prot_commit = __ptep_modify_prot_commit,
#ifdef CONFIG_HIGHPTE
.kmap_atomic_pte = kmap_atomic,
#endif
#if PAGETABLE_LEVELS >= 3
#ifdef CONFIG_X86_PAE
.set_pte_atomic = native_set_pte_atomic,

35
arch/x86/kernel/vmi_32.c
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@ -33,6 +33,7 @@
#include <asm/fixmap.h>
#include <asm/apicdef.h>
#include <asm/apic.h>
#include <asm/pgalloc.h>
#include <asm/processor.h>
#include <asm/timer.h>
#include <asm/vmi_time.h>
@ -266,30 +267,6 @@ static void vmi_nop(void)
{
}
#ifdef CONFIG_HIGHPTE
static void *vmi_kmap_atomic_pte(struct page *page, enum km_type type)
{
void *va = kmap_atomic(page, type);
/*
* Internally, the VMI ROM must map virtual addresses to physical
* addresses for processing MMU updates. By the time MMU updates
* are issued, this information is typically already lost.
* Fortunately, the VMI provides a cache of mapping slots for active
* page tables.
*
* We use slot zero for the linear mapping of physical memory, and
* in HIGHPTE kernels, slot 1 and 2 for KM_PTE0 and KM_PTE1.
*
* args: SLOT VA COUNT PFN
*/
BUG_ON(type != KM_PTE0 && type != KM_PTE1);
vmi_ops.set_linear_mapping((type - KM_PTE0)+1, va, 1, page_to_pfn(page));
return va;
}
#endif
static void vmi_allocate_pte(struct mm_struct *mm, unsigned long pfn)
{
vmi_ops.allocate_page(pfn, VMI_PAGE_L1, 0, 0, 0);
@ -640,6 +617,12 @@ static inline int __init activate_vmi(void)
u64 reloc;
const struct vmi_relocation_info *rel = (struct vmi_relocation_info *)&reloc;
/*
* Prevent page tables from being allocated in highmem, even if
* CONFIG_HIGHPTE is enabled.
*/
__userpte_alloc_gfp &= ~__GFP_HIGHMEM;
if (call_vrom_func(vmi_rom, vmi_init) != 0) {
printk(KERN_ERR "VMI ROM failed to initialize!");
return 0;
@ -778,10 +761,6 @@ static inline int __init activate_vmi(void)
/* Set linear is needed in all cases */
vmi_ops.set_linear_mapping = vmi_get_function(VMI_CALL_SetLinearMapping);
#ifdef CONFIG_HIGHPTE
if (vmi_ops.set_linear_mapping)
pv_mmu_ops.kmap_atomic_pte = vmi_kmap_atomic_pte;
#endif
/*
* These MUST always be patched. Don't support indirect jumps

7
arch/x86/xen/enlighten.c
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@ -50,6 +50,7 @@
#include <asm/traps.h>
#include <asm/setup.h>
#include <asm/desc.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/reboot.h>
@ -1094,6 +1095,12 @@ asmlinkage void __init xen_start_kernel(void)
__supported_pte_mask |= _PAGE_IOMAP;
/*
* Prevent page tables from being allocated in highmem, even
* if CONFIG_HIGHPTE is enabled.
*/
__userpte_alloc_gfp &= ~__GFP_HIGHMEM;
/* Work out if we support NX */
x86_configure_nx();

21
arch/x86/xen/mmu.c
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@ -1427,23 +1427,6 @@ static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd)
#endif
}
#ifdef CONFIG_HIGHPTE
static void *xen_kmap_atomic_pte(struct page *page, enum km_type type)
{
pgprot_t prot = PAGE_KERNEL;
if (PagePinned(page))
prot = PAGE_KERNEL_RO;
if (0 && PageHighMem(page))
printk("mapping highpte %lx type %d prot %s\n",
page_to_pfn(page), type,
(unsigned long)pgprot_val(prot) & _PAGE_RW ? "WRITE" : "READ");
return kmap_atomic_prot(page, type, prot);
}
#endif
#ifdef CONFIG_X86_32
static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte)
{
@ -1902,10 +1885,6 @@ static const struct pv_mmu_ops xen_mmu_ops __initdata = {
.alloc_pmd_clone = paravirt_nop,
.release_pmd = xen_release_pmd_init,
#ifdef CONFIG_HIGHPTE
.kmap_atomic_pte = xen_kmap_atomic_pte,
#endif
#ifdef CONFIG_X86_64
.set_pte = xen_set_pte,
#else

9
kernel/resource.c
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@ -304,7 +304,7 @@ int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
void *arg, int (*func)(unsigned long, unsigned long, void *))
{
struct resource res;
unsigned long pfn, len;
unsigned long pfn, end_pfn;
u64 orig_end;
int ret = -1;
@ -314,9 +314,10 @@ int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
orig_end = res.end;
while ((res.start < res.end) &&
(find_next_system_ram(&res, "System RAM") >= 0)) {
pfn = (unsigned long)(res.start >> PAGE_SHIFT);
len = (unsigned long)((res.end + 1 - res.start) >> PAGE_SHIFT);
ret = (*func)(pfn, len, arg);
pfn = (res.start + PAGE_SIZE - 1) >> PAGE_SHIFT;
end_pfn = (res.end + 1) >> PAGE_SHIFT;
if (end_pfn > pfn)
ret = (*func)(pfn, end_pfn - pfn, arg);
if (ret)
break;
res.start = res.end + 1;