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-rw-r--r--arch/x86/mm/pageattr_32.c151
1 files changed, 83 insertions, 68 deletions
diff --git a/arch/x86/mm/pageattr_32.c b/arch/x86/mm/pageattr_32.c
index 260073c0760..be4656403d7 100644
--- a/arch/x86/mm/pageattr_32.c
+++ b/arch/x86/mm/pageattr_32.c
@@ -1,28 +1,29 @@
-/*
- * Copyright 2002 Andi Kleen, SuSE Labs.
+/*
+ * Copyright 2002 Andi Kleen, SuSE Labs.
* Thanks to Ben LaHaise for precious feedback.
- */
+ */
-#include <linux/mm.h>
-#include <linux/sched.h>
#include <linux/highmem.h>
#include <linux/module.h>
+#include <linux/sched.h>
#include <linux/slab.h>
-#include <asm/uaccess.h>
+#include <linux/mm.h>
+
#include <asm/processor.h>
#include <asm/tlbflush.h>
-#include <asm/pgalloc.h>
#include <asm/sections.h>
+#include <asm/uaccess.h>
+#include <asm/pgalloc.h>
static DEFINE_SPINLOCK(cpa_lock);
static struct list_head df_list = LIST_HEAD_INIT(df_list);
-
-pte_t *lookup_address(unsigned long address)
-{
+pte_t *lookup_address(unsigned long address)
+{
pgd_t *pgd = pgd_offset_k(address);
pud_t *pud;
pmd_t *pmd;
+
if (pgd_none(*pgd))
return NULL;
pud = pud_offset(pgd, address);
@@ -33,21 +34,22 @@ pte_t *lookup_address(unsigned long address)
return NULL;
if (pmd_large(*pmd))
return (pte_t *)pmd;
- return pte_offset_kernel(pmd, address);
-}
-static struct page *split_large_page(unsigned long address, pgprot_t prot,
- pgprot_t ref_prot)
-{
- int i;
+ return pte_offset_kernel(pmd, address);
+}
+
+static struct page *
+split_large_page(unsigned long address, pgprot_t prot, pgprot_t ref_prot)
+{
unsigned long addr;
struct page *base;
pte_t *pbase;
+ int i;
spin_unlock_irq(&cpa_lock);
base = alloc_pages(GFP_KERNEL, 0);
spin_lock_irq(&cpa_lock);
- if (!base)
+ if (!base)
return NULL;
/*
@@ -58,22 +60,24 @@ static struct page *split_large_page(unsigned long address, pgprot_t prot,
page_private(base) = 0;
address = __pa(address);
- addr = address & LARGE_PAGE_MASK;
+ addr = address & LARGE_PAGE_MASK;
pbase = (pte_t *)page_address(base);
paravirt_alloc_pt(&init_mm, page_to_pfn(base));
+
for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE) {
- set_pte(&pbase[i], pfn_pte(addr >> PAGE_SHIFT,
- addr == address ? prot : ref_prot));
+ set_pte(&pbase[i], pfn_pte(addr >> PAGE_SHIFT,
+ addr == address ? prot : ref_prot));
}
return base;
-}
+}
static void cache_flush_page(struct page *p)
-{
- void *adr = page_address(p);
+{
+ void *addr = page_address(p);
int i;
+
for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
- clflush(adr+i);
+ clflush(addr + i);
}
static void flush_kernel_map(void *arg)
@@ -83,23 +87,27 @@ static void flush_kernel_map(void *arg)
/* High level code is not ready for clflush yet */
if (0 && cpu_has_clflush) {
- list_for_each_entry (p, lh, lru)
+ list_for_each_entry(p, lh, lru)
cache_flush_page(p);
- } else if (boot_cpu_data.x86_model >= 4)
- wbinvd();
+ } else {
+ if (boot_cpu_data.x86_model >= 4)
+ wbinvd();
+ }
- /* Flush all to work around Errata in early athlons regarding
- * large page flushing.
+ /*
+ * Flush all to work around Errata in early athlons regarding
+ * large page flushing.
*/
- __flush_tlb_all();
+ __flush_tlb_all();
}
-static void set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)
-{
- struct page *page;
+static void set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)
+{
unsigned long flags;
+ struct page *page;
- set_pte_atomic(kpte, pte); /* change init_mm */
+ /* change init_mm */
+ set_pte_atomic(kpte, pte);
if (SHARED_KERNEL_PMD)
return;
@@ -108,6 +116,7 @@ static void set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
+
pgd = (pgd_t *)page_address(page) + pgd_index(address);
pud = pud_offset(pgd, address);
pmd = pmd_offset(pud, address);
@@ -116,9 +125,9 @@ static void set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)
spin_unlock_irqrestore(&pgd_lock, flags);
}
-/*
- * No more special protections in this 2/4MB area - revert to a
- * large page again.
+/*
+ * No more special protections in this 2/4MB area - revert to a large
+ * page again.
*/
static inline void revert_page(struct page *kpte_page, unsigned long address)
{
@@ -142,12 +151,11 @@ static inline void save_page(struct page *kpte_page)
list_add(&kpte_page->lru, &df_list);
}
-static int
-__change_page_attr(struct page *page, pgprot_t prot)
-{
- pte_t *kpte;
- unsigned long address;
+static int __change_page_attr(struct page *page, pgprot_t prot)
+{
struct page *kpte_page;
+ unsigned long address;
+ pte_t *kpte;
BUG_ON(PageHighMem(page));
address = (unsigned long)page_address(page);
@@ -155,16 +163,17 @@ __change_page_attr(struct page *page, pgprot_t prot)
kpte = lookup_address(address);
if (!kpte)
return -EINVAL;
+
kpte_page = virt_to_page(kpte);
BUG_ON(PageLRU(kpte_page));
BUG_ON(PageCompound(kpte_page));
- if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL)) {
+ if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL)) {
if (!pte_huge(*kpte)) {
- set_pte_atomic(kpte, mk_pte(page, prot));
+ set_pte_atomic(kpte, mk_pte(page, prot));
} else {
- pgprot_t ref_prot;
struct page *split;
+ pgprot_t ref_prot;
ref_prot =
((address & LARGE_PAGE_MASK) < (unsigned long)&_etext)
@@ -172,16 +181,19 @@ __change_page_attr(struct page *page, pgprot_t prot)
split = split_large_page(address, prot, ref_prot);
if (!split)
return -ENOMEM;
- set_pmd_pte(kpte,address,mk_pte(split, ref_prot));
+
+ set_pmd_pte(kpte, address, mk_pte(split, ref_prot));
kpte_page = split;
}
page_private(kpte_page)++;
- } else if (!pte_huge(*kpte)) {
- set_pte_atomic(kpte, mk_pte(page, PAGE_KERNEL));
- BUG_ON(page_private(kpte_page) == 0);
- page_private(kpte_page)--;
- } else
- BUG();
+ } else {
+ if (!pte_huge(*kpte)) {
+ set_pte_atomic(kpte, mk_pte(page, PAGE_KERNEL));
+ BUG_ON(page_private(kpte_page) == 0);
+ page_private(kpte_page)--;
+ } else
+ BUG();
+ }
/*
* If the pte was reserved, it means it was created at boot
@@ -197,7 +209,7 @@ __change_page_attr(struct page *page, pgprot_t prot)
}
}
return 0;
-}
+}
static inline void flush_map(struct list_head *l)
{
@@ -211,32 +223,33 @@ static inline void flush_map(struct list_head *l)
* than write-back somewhere - some CPUs do not like it when mappings with
* different caching policies exist. This changes the page attributes of the
* in kernel linear mapping too.
- *
+ *
* The caller needs to ensure that there are no conflicting mappings elsewhere.
* This function only deals with the kernel linear map.
- *
+ *
* Caller must call global_flush_tlb() after this.
*/
int change_page_attr(struct page *page, int numpages, pgprot_t prot)
{
- int err = 0;
- int i;
unsigned long flags;
+ int err = 0, i;
spin_lock_irqsave(&cpa_lock, flags);
- for (i = 0; i < numpages; i++, page++) {
+ for (i = 0; i < numpages; i++, page++) {
err = __change_page_attr(page, prot);
- if (err)
- break;
- }
+ if (err)
+ break;
+ }
spin_unlock_irqrestore(&cpa_lock, flags);
+
return err;
}
+EXPORT_SYMBOL(change_page_attr);
void global_flush_tlb(void)
{
- struct list_head l;
struct page *pg, *next;
+ struct list_head l;
BUG_ON(irqs_disabled());
@@ -253,26 +266,28 @@ void global_flush_tlb(void)
__free_page(pg);
}
}
+EXPORT_SYMBOL(global_flush_tlb);
#ifdef CONFIG_DEBUG_PAGEALLOC
void kernel_map_pages(struct page *page, int numpages, int enable)
{
if (PageHighMem(page))
return;
- if (!enable)
+ if (!enable) {
debug_check_no_locks_freed(page_address(page),
numpages * PAGE_SIZE);
+ }
- /* the return value is ignored - the calls cannot fail,
+ /*
+ * the return value is ignored - the calls cannot fail,
* large pages are disabled at boot time.
*/
change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
- /* we should perform an IPI and flush all tlbs,
+
+ /*
+ * we should perform an IPI and flush all tlbs,
* but that can deadlock->flush only current cpu.
*/
__flush_tlb_all();
}
#endif
-
-EXPORT_SYMBOL(change_page_attr);
-EXPORT_SYMBOL(global_flush_tlb);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-08 12:48:40 +0000