d0f5fce77d95b9f8afa7c0879a3e211b937365b8
2 * Copyright (C) 1995 Linus Torvalds
3 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs.
6 #include <linux/signal.h>
7 #include <linux/sched.h>
8 #include <linux/kernel.h>
9 #include <linux/errno.h>
10 #include <linux/string.h>
11 #include <linux/types.h>
12 #include <linux/ptrace.h>
13 #include <linux/mman.h>
15 #include <linux/smp.h>
16 #include <linux/interrupt.h>
17 #include <linux/init.h>
18 #include <linux/tty.h>
19 #include <linux/vt_kern.h> /* For unblank_screen() */
20 #include <linux/compiler.h>
21 #include <linux/highmem.h>
22 #include <linux/bootmem.h> /* for max_low_pfn */
23 #include <linux/vmalloc.h>
24 #include <linux/module.h>
25 #include <linux/kprobes.h>
26 #include <linux/uaccess.h>
27 #include <linux/kdebug.h>
29 #include <asm/system.h>
31 #include <asm/segment.h>
32 #include <asm/pgalloc.h>
34 #include <asm/tlbflush.h>
35 #include <asm/proto.h>
36 #include <asm-generic/sections.h>
39 * Page fault error code bits
40 * bit 0 == 0 means no page found, 1 means protection fault
41 * bit 1 == 0 means read, 1 means write
42 * bit 2 == 0 means kernel, 1 means user-mode
43 * bit 3 == 1 means use of reserved bit detected
44 * bit 4 == 1 means fault was an instruction fetch
46 #define PF_PROT (1<<0)
47 #define PF_WRITE (1<<1)
48 #define PF_USER (1<<2)
49 #define PF_RSVD (1<<3)
50 #define PF_INSTR (1<<4)
52 static inline int notify_page_fault(struct pt_regs
*regs
)
57 /* kprobe_running() needs smp_processor_id() */
58 if (!user_mode_vm(regs
)) {
60 if (kprobe_running() && kprobe_fault_handler(regs
, 14))
73 * Sometimes AMD Athlon/Opteron CPUs report invalid exceptions on prefetch.
74 * Check that here and ignore it.
77 * Sometimes the CPU reports invalid exceptions on prefetch.
78 * Check that here and ignore it.
80 * Opcode checker based on code by Richard Brunner
82 static int is_prefetch(struct pt_regs
*regs
, unsigned long addr
,
83 unsigned long error_code
)
88 unsigned char *max_instr
;
91 * If it was a exec (instruction fetch) fault on NX page, then
92 * do not ignore the fault:
94 if (error_code
& PF_INSTR
)
97 instr
= (unsigned char *)convert_ip_to_linear(current
, regs
);
98 max_instr
= instr
+ 15;
100 if (user_mode(regs
) && instr
>= (unsigned char *)TASK_SIZE
)
103 while (scan_more
&& instr
< max_instr
) {
104 unsigned char opcode
;
105 unsigned char instr_hi
;
106 unsigned char instr_lo
;
108 if (probe_kernel_address(instr
, opcode
))
111 instr_hi
= opcode
& 0xf0;
112 instr_lo
= opcode
& 0x0f;
119 * Values 0x26,0x2E,0x36,0x3E are valid x86 prefixes.
120 * In X86_64 long mode, the CPU will signal invalid
121 * opcode if some of these prefixes are present so
122 * X86_64 will never get here anyway
124 scan_more
= ((instr_lo
& 7) == 0x6);
129 * In AMD64 long mode 0x40..0x4F are valid REX prefixes
130 * Need to figure out under what instruction mode the
131 * instruction was issued. Could check the LDT for lm,
132 * but for now it's good enough to assume that long
133 * mode only uses well known segments or kernel.
135 scan_more
= (!user_mode(regs
)) || (regs
->cs
== __USER_CS
);
139 /* 0x64 thru 0x67 are valid prefixes in all modes. */
140 scan_more
= (instr_lo
& 0xC) == 0x4;
143 /* 0xF0, 0xF2, 0xF3 are valid prefixes in all modes. */
144 scan_more
= !instr_lo
|| (instr_lo
>>1) == 1;
147 /* Prefetch instruction is 0x0F0D or 0x0F18 */
150 if (probe_kernel_address(instr
, opcode
))
152 prefetch
= (instr_lo
== 0xF) &&
153 (opcode
== 0x0D || opcode
== 0x18);
163 static void force_sig_info_fault(int si_signo
, int si_code
,
164 unsigned long address
, struct task_struct
*tsk
)
168 info
.si_signo
= si_signo
;
170 info
.si_code
= si_code
;
171 info
.si_addr
= (void __user
*)address
;
172 force_sig_info(si_signo
, &info
, tsk
);
176 static int bad_address(void *p
)
179 return probe_kernel_address((unsigned long *)p
, dummy
);
183 static void dump_pagetable(unsigned long address
)
186 __typeof__(pte_val(__pte(0))) page
;
189 page
= ((__typeof__(page
) *) __va(page
))[address
>> PGDIR_SHIFT
];
190 #ifdef CONFIG_X86_PAE
191 printk("*pdpt = %016Lx ", page
);
192 if ((page
>> PAGE_SHIFT
) < max_low_pfn
193 && page
& _PAGE_PRESENT
) {
195 page
= ((__typeof__(page
) *) __va(page
))[(address
>> PMD_SHIFT
)
196 & (PTRS_PER_PMD
- 1)];
197 printk(KERN_CONT
"*pde = %016Lx ", page
);
201 printk("*pde = %08lx ", page
);
205 * We must not directly access the pte in the highpte
206 * case if the page table is located in highmem.
207 * And let's rather not kmap-atomic the pte, just in case
208 * it's allocated already.
210 if ((page
>> PAGE_SHIFT
) < max_low_pfn
211 && (page
& _PAGE_PRESENT
)
212 && !(page
& _PAGE_PSE
)) {
214 page
= ((__typeof__(page
) *) __va(page
))[(address
>> PAGE_SHIFT
)
215 & (PTRS_PER_PTE
- 1)];
216 printk("*pte = %0*Lx ", sizeof(page
)*2, (u64
)page
);
220 #else /* CONFIG_X86_64 */
226 pgd
= (pgd_t
*)read_cr3();
228 pgd
= __va((unsigned long)pgd
& PHYSICAL_PAGE_MASK
);
229 pgd
+= pgd_index(address
);
230 if (bad_address(pgd
)) goto bad
;
231 printk("PGD %lx ", pgd_val(*pgd
));
232 if (!pgd_present(*pgd
)) goto ret
;
234 pud
= pud_offset(pgd
, address
);
235 if (bad_address(pud
)) goto bad
;
236 printk("PUD %lx ", pud_val(*pud
));
237 if (!pud_present(*pud
) || pud_large(*pud
))
240 pmd
= pmd_offset(pud
, address
);
241 if (bad_address(pmd
)) goto bad
;
242 printk("PMD %lx ", pmd_val(*pmd
));
243 if (!pmd_present(*pmd
) || pmd_large(*pmd
)) goto ret
;
245 pte
= pte_offset_kernel(pmd
, address
);
246 if (bad_address(pte
)) goto bad
;
247 printk("PTE %lx", pte_val(*pte
));
257 static inline pmd_t
*vmalloc_sync_one(pgd_t
*pgd
, unsigned long address
)
259 unsigned index
= pgd_index(address
);
265 pgd_k
= init_mm
.pgd
+ index
;
267 if (!pgd_present(*pgd_k
))
271 * set_pgd(pgd, *pgd_k); here would be useless on PAE
272 * and redundant with the set_pmd() on non-PAE. As would
276 pud
= pud_offset(pgd
, address
);
277 pud_k
= pud_offset(pgd_k
, address
);
278 if (!pud_present(*pud_k
))
281 pmd
= pmd_offset(pud
, address
);
282 pmd_k
= pmd_offset(pud_k
, address
);
283 if (!pmd_present(*pmd_k
))
285 if (!pmd_present(*pmd
)) {
286 set_pmd(pmd
, *pmd_k
);
287 arch_flush_lazy_mmu_mode();
289 BUG_ON(pmd_page(*pmd
) != pmd_page(*pmd_k
));
295 static const char errata93_warning
[] =
296 KERN_ERR
"******* Your BIOS seems to not contain a fix for K8 errata #93\n"
297 KERN_ERR
"******* Working around it, but it may cause SEGVs or burn power.\n"
298 KERN_ERR
"******* Please consider a BIOS update.\n"
299 KERN_ERR
"******* Disabling USB legacy in the BIOS may also help.\n";
302 /* Workaround for K8 erratum #93 & buggy BIOS.
303 BIOS SMM functions are required to use a specific workaround
304 to avoid corruption of the 64bit RIP register on C stepping K8.
305 A lot of BIOS that didn't get tested properly miss this.
306 The OS sees this as a page fault with the upper 32bits of RIP cleared.
307 Try to work around it here.
308 Note we only handle faults in kernel here.
309 Does nothing for X86_32
311 static int is_errata93(struct pt_regs
*regs
, unsigned long address
)
315 if (address
!= regs
->ip
)
317 if ((address
>> 32) != 0)
319 address
|= 0xffffffffUL
<< 32;
320 if ((address
>= (u64
)_stext
&& address
<= (u64
)_etext
) ||
321 (address
>= MODULES_VADDR
&& address
<= MODULES_END
)) {
323 printk(errata93_warning
);
334 * Work around K8 erratum #100 K8 in compat mode occasionally jumps to illegal
335 * addresses >4GB. We catch this in the page fault handler because these
336 * addresses are not reachable. Just detect this case and return. Any code
337 * segment in LDT is compatibility mode.
339 static int is_errata100(struct pt_regs
*regs
, unsigned long address
)
342 if ((regs
->cs
== __USER32_CS
|| (regs
->cs
& (1<<2))) &&
349 void do_invalid_op(struct pt_regs
*, unsigned long);
351 static int is_f00f_bug(struct pt_regs
*regs
, unsigned long address
)
353 #ifdef CONFIG_X86_F00F_BUG
356 * Pentium F0 0F C7 C8 bug workaround.
358 if (boot_cpu_data
.f00f_bug
) {
359 nr
= (address
- idt_descr
.address
) >> 3;
362 do_invalid_op(regs
, 0);
370 static void show_fault_oops(struct pt_regs
*regs
, unsigned long error_code
,
371 unsigned long address
)
374 if (!oops_may_print())
378 #ifdef CONFIG_X86_PAE
379 if (error_code
& PF_INSTR
) {
381 pte_t
*pte
= lookup_address(address
, &level
);
383 if (pte
&& pte_present(*pte
) && !pte_exec(*pte
))
384 printk(KERN_CRIT
"kernel tried to execute "
385 "NX-protected page - exploit attempt? "
386 "(uid: %d)\n", current
->uid
);
390 printk(KERN_ALERT
"BUG: unable to handle kernel ");
391 if (address
< PAGE_SIZE
)
392 printk(KERN_CONT
"NULL pointer dereference");
394 printk(KERN_CONT
"paging request");
395 printk(KERN_CONT
" at %p\n", (void *) address
);
396 printk(KERN_ALERT
"IP:");
397 printk_address(regs
->ip
, 1);
398 dump_pagetable(address
);
402 static noinline
void pgtable_bad(unsigned long address
, struct pt_regs
*regs
,
403 unsigned long error_code
)
405 unsigned long flags
= oops_begin();
406 struct task_struct
*tsk
;
408 printk(KERN_ALERT
"%s: Corrupted page table at address %lx\n",
409 current
->comm
, address
);
410 dump_pagetable(address
);
412 tsk
->thread
.cr2
= address
;
413 tsk
->thread
.trap_no
= 14;
414 tsk
->thread
.error_code
= error_code
;
415 if (__die("Bad pagetable", regs
, error_code
))
417 oops_end(flags
, regs
, SIGKILL
);
421 static int spurious_fault_check(unsigned long error_code
, pte_t
*pte
)
423 if ((error_code
& PF_WRITE
) && !pte_write(*pte
))
425 if ((error_code
& PF_INSTR
) && !pte_exec(*pte
))
432 * Handle a spurious fault caused by a stale TLB entry. This allows
433 * us to lazily refresh the TLB when increasing the permissions of a
434 * kernel page (RO -> RW or NX -> X). Doing it eagerly is very
435 * expensive since that implies doing a full cross-processor TLB
436 * flush, even if no stale TLB entries exist on other processors.
437 * There are no security implications to leaving a stale TLB when
438 * increasing the permissions on a page.
440 static int spurious_fault(unsigned long address
,
441 unsigned long error_code
)
448 /* Reserved-bit violation or user access to kernel space? */
449 if (error_code
& (PF_USER
| PF_RSVD
))
452 pgd
= init_mm
.pgd
+ pgd_index(address
);
453 if (!pgd_present(*pgd
))
456 pud
= pud_offset(pgd
, address
);
457 if (!pud_present(*pud
))
461 return spurious_fault_check(error_code
, (pte_t
*) pud
);
463 pmd
= pmd_offset(pud
, address
);
464 if (!pmd_present(*pmd
))
468 return spurious_fault_check(error_code
, (pte_t
*) pmd
);
470 pte
= pte_offset_kernel(pmd
, address
);
471 if (!pte_present(*pte
))
474 return spurious_fault_check(error_code
, pte
);
479 * Handle a fault on the vmalloc or module mapping area
482 * Handle a fault on the vmalloc area
484 * This assumes no large pages in there.
486 static int vmalloc_fault(unsigned long address
)
489 unsigned long pgd_paddr
;
493 /* Make sure we are in vmalloc area */
494 if (!(address
>= VMALLOC_START
&& address
< VMALLOC_END
))
498 * Synchronize this task's top level page-table
499 * with the 'reference' page table.
501 * Do _not_ use "current" here. We might be inside
502 * an interrupt in the middle of a task switch..
504 pgd_paddr
= read_cr3();
505 pmd_k
= vmalloc_sync_one(__va(pgd_paddr
), address
);
508 pte_k
= pte_offset_kernel(pmd_k
, address
);
509 if (!pte_present(*pte_k
))
513 pgd_t
*pgd
, *pgd_ref
;
514 pud_t
*pud
, *pud_ref
;
515 pmd_t
*pmd
, *pmd_ref
;
516 pte_t
*pte
, *pte_ref
;
518 /* Make sure we are in vmalloc area */
519 if (!(address
>= VMALLOC_START
&& address
< VMALLOC_END
))
522 /* Copy kernel mappings over when needed. This can also
523 happen within a race in page table update. In the later
526 pgd
= pgd_offset(current
->mm
?: &init_mm
, address
);
527 pgd_ref
= pgd_offset_k(address
);
528 if (pgd_none(*pgd_ref
))
531 set_pgd(pgd
, *pgd_ref
);
533 BUG_ON(pgd_page_vaddr(*pgd
) != pgd_page_vaddr(*pgd_ref
));
535 /* Below here mismatches are bugs because these lower tables
538 pud
= pud_offset(pgd
, address
);
539 pud_ref
= pud_offset(pgd_ref
, address
);
540 if (pud_none(*pud_ref
))
542 if (pud_none(*pud
) || pud_page_vaddr(*pud
) != pud_page_vaddr(*pud_ref
))
544 pmd
= pmd_offset(pud
, address
);
545 pmd_ref
= pmd_offset(pud_ref
, address
);
546 if (pmd_none(*pmd_ref
))
548 if (pmd_none(*pmd
) || pmd_page(*pmd
) != pmd_page(*pmd_ref
))
550 pte_ref
= pte_offset_kernel(pmd_ref
, address
);
551 if (!pte_present(*pte_ref
))
553 pte
= pte_offset_kernel(pmd
, address
);
554 /* Don't use pte_page here, because the mappings can point
555 outside mem_map, and the NUMA hash lookup cannot handle
557 if (!pte_present(*pte
) || pte_pfn(*pte
) != pte_pfn(*pte_ref
))
563 int show_unhandled_signals
= 1;
566 * This routine handles page faults. It determines the address,
567 * and the problem, and then passes it off to one of the appropriate
573 void __kprobes
do_page_fault(struct pt_regs
*regs
, unsigned long error_code
)
575 struct task_struct
*tsk
;
576 struct mm_struct
*mm
;
577 struct vm_area_struct
*vma
;
578 unsigned long address
;
586 * We can fault from pretty much anywhere, with unknown IRQ state.
588 trace_hardirqs_fixup();
592 prefetchw(&mm
->mmap_sem
);
594 /* get the address */
595 address
= read_cr2();
597 si_code
= SEGV_MAPERR
;
599 if (notify_page_fault(regs
))
603 * We fault-in kernel-space virtual memory on-demand. The
604 * 'reference' page table is init_mm.pgd.
606 * NOTE! We MUST NOT take any locks for this case. We may
607 * be in an interrupt or a critical region, and should
608 * only copy the information from the master page table,
611 * This verifies that the fault happens in kernel space
612 * (error_code & 4) == 0, and that the fault was not a
613 * protection error (error_code & 9) == 0.
616 if (unlikely(address
>= TASK_SIZE
)) {
618 if (unlikely(address
>= TASK_SIZE64
)) {
620 if (!(error_code
& (PF_RSVD
|PF_USER
|PF_PROT
)) &&
621 vmalloc_fault(address
) >= 0)
624 /* Can handle a stale RO->RW TLB */
625 if (spurious_fault(address
, error_code
))
629 * Don't take the mm semaphore here. If we fixup a prefetch
630 * fault we could otherwise deadlock.
632 goto bad_area_nosemaphore
;
637 /* It's safe to allow irq's after cr2 has been saved and the vmalloc
638 fault has been handled. */
639 if (regs
->flags
& (X86_EFLAGS_IF
| X86_VM_MASK
))
643 * If we're in an interrupt, have no user context or are running in an
644 * atomic region then we must not take the fault.
646 if (in_atomic() || !mm
)
647 goto bad_area_nosemaphore
;
648 #else /* CONFIG_X86_64 */
649 if (likely(regs
->flags
& X86_EFLAGS_IF
))
652 if (unlikely(error_code
& PF_RSVD
))
653 pgtable_bad(address
, regs
, error_code
);
656 * If we're in an interrupt, have no user context or are running in an
657 * atomic region then we must not take the fault.
659 if (unlikely(in_atomic() || !mm
))
660 goto bad_area_nosemaphore
;
663 * User-mode registers count as a user access even for any
664 * potential system fault or CPU buglet.
666 if (user_mode_vm(regs
))
667 error_code
|= PF_USER
;
670 /* When running in the kernel we expect faults to occur only to
671 * addresses in user space. All other faults represent errors in the
672 * kernel and should generate an OOPS. Unfortunately, in the case of an
673 * erroneous fault occurring in a code path which already holds mmap_sem
674 * we will deadlock attempting to validate the fault against the
675 * address space. Luckily the kernel only validly references user
676 * space from well defined areas of code, which are listed in the
679 * As the vast majority of faults will be valid we will only perform
680 * the source reference check when there is a possibility of a deadlock.
681 * Attempt to lock the address space, if we cannot we then validate the
682 * source. If this is invalid we can skip the address space check,
683 * thus avoiding the deadlock.
685 if (!down_read_trylock(&mm
->mmap_sem
)) {
686 if ((error_code
& PF_USER
) == 0 &&
687 !search_exception_tables(regs
->ip
))
688 goto bad_area_nosemaphore
;
689 down_read(&mm
->mmap_sem
);
692 vma
= find_vma(mm
, address
);
695 if (vma
->vm_start
<= address
)
697 if (!(vma
->vm_flags
& VM_GROWSDOWN
))
699 if (error_code
& PF_USER
) {
701 * Accessing the stack below %sp is always a bug.
702 * The large cushion allows instructions like enter
703 * and pusha to work. ("enter $65535,$31" pushes
704 * 32 pointers and then decrements %sp by 65535.)
706 if (address
+ 65536 + 32 * sizeof(unsigned long) < regs
->sp
)
709 if (expand_stack(vma
, address
))
712 * Ok, we have a good vm_area for this memory access, so
716 si_code
= SEGV_ACCERR
;
718 switch (error_code
& (PF_PROT
|PF_WRITE
)) {
719 default: /* 3: write, present */
721 case PF_WRITE
: /* write, not present */
722 if (!(vma
->vm_flags
& VM_WRITE
))
726 case PF_PROT
: /* read, present */
728 case 0: /* read, not present */
729 if (!(vma
->vm_flags
& (VM_READ
| VM_EXEC
| VM_WRITE
)))
737 * If for any reason at all we couldn't handle the fault,
738 * make sure we exit gracefully rather than endlessly redo
741 fault
= handle_mm_fault(mm
, vma
, address
, write
);
742 if (unlikely(fault
& VM_FAULT_ERROR
)) {
743 if (fault
& VM_FAULT_OOM
)
745 else if (fault
& VM_FAULT_SIGBUS
)
749 if (fault
& VM_FAULT_MAJOR
)
756 * Did it hit the DOS screen memory VA from vm86 mode?
758 if (v8086_mode(regs
)) {
759 unsigned long bit
= (address
- 0xA0000) >> PAGE_SHIFT
;
761 tsk
->thread
.screen_bitmap
|= 1 << bit
;
764 up_read(&mm
->mmap_sem
);
768 * Something tried to access memory that isn't in our memory map..
769 * Fix it, but check if it's kernel or user first..
772 up_read(&mm
->mmap_sem
);
774 bad_area_nosemaphore
:
775 /* User mode accesses just cause a SIGSEGV */
776 if (error_code
& PF_USER
) {
778 * It's possible to have interrupts off here.
783 * Valid to do another page fault here because this one came
786 if (is_prefetch(regs
, address
, error_code
))
789 if (is_errata100(regs
, address
))
792 if (show_unhandled_signals
&& unhandled_signal(tsk
, SIGSEGV
) &&
793 printk_ratelimit()) {
795 "%s%s[%d]: segfault at %lx ip %p sp %p error %lx",
796 task_pid_nr(tsk
) > 1 ? KERN_INFO
: KERN_EMERG
,
797 tsk
->comm
, task_pid_nr(tsk
), address
,
798 (void *) regs
->ip
, (void *) regs
->sp
, error_code
);
799 print_vma_addr(" in ", regs
->ip
);
803 tsk
->thread
.cr2
= address
;
804 /* Kernel addresses are always protection faults */
805 tsk
->thread
.error_code
= error_code
| (address
>= TASK_SIZE
);
806 tsk
->thread
.trap_no
= 14;
807 force_sig_info_fault(SIGSEGV
, si_code
, address
, tsk
);
811 if (is_f00f_bug(regs
, address
))
815 /* Are we prepared to handle this kernel fault? */
816 if (fixup_exception(regs
))
821 * Valid to do another page fault here, because if this fault
822 * had been triggered by is_prefetch fixup_exception would have
826 * Hall of shame of CPU/BIOS bugs.
828 if (is_prefetch(regs
, address
, error_code
))
831 if (is_errata93(regs
, address
))
835 * Oops. The kernel tried to access some bad page. We'll have to
836 * terminate things with extreme prejudice.
841 flags
= oops_begin();
844 show_fault_oops(regs
, error_code
, address
);
846 tsk
->thread
.cr2
= address
;
847 tsk
->thread
.trap_no
= 14;
848 tsk
->thread
.error_code
= error_code
;
851 die("Oops", regs
, error_code
);
855 if (__die("Oops", regs
, error_code
))
857 /* Executive summary in case the body of the oops scrolled away */
858 printk(KERN_EMERG
"CR2: %016lx\n", address
);
859 oops_end(flags
, regs
, SIGKILL
);
863 * We ran out of memory, or some other thing happened to us that made
864 * us unable to handle the page fault gracefully.
867 up_read(&mm
->mmap_sem
);
868 if (is_global_init(tsk
)) {
871 down_read(&mm
->mmap_sem
);
878 printk("VM: killing process %s\n", tsk
->comm
);
879 if (error_code
& PF_USER
)
880 do_group_exit(SIGKILL
);
884 up_read(&mm
->mmap_sem
);
886 /* Kernel mode? Handle exceptions or die */
887 if (!(error_code
& PF_USER
))
890 /* User space => ok to do another page fault */
891 if (is_prefetch(regs
, address
, error_code
))
894 tsk
->thread
.cr2
= address
;
895 tsk
->thread
.error_code
= error_code
;
896 tsk
->thread
.trap_no
= 14;
897 force_sig_info_fault(SIGBUS
, BUS_ADRERR
, address
, tsk
);
900 DEFINE_SPINLOCK(pgd_lock
);
903 void vmalloc_sync_all(void)
906 unsigned long start
= VMALLOC_START
& PGDIR_MASK
;
907 unsigned long address
;
909 if (SHARED_KERNEL_PMD
)
912 BUILD_BUG_ON(TASK_SIZE
& ~PGDIR_MASK
);
913 for (address
= start
; address
>= TASK_SIZE
; address
+= PGDIR_SIZE
) {
917 spin_lock_irqsave(&pgd_lock
, flags
);
918 list_for_each_entry(page
, &pgd_list
, lru
) {
919 if (!vmalloc_sync_one(page_address(page
),
923 spin_unlock_irqrestore(&pgd_lock
, flags
);
925 #else /* CONFIG_X86_64 */
926 unsigned long start
= VMALLOC_START
& PGDIR_MASK
;
927 unsigned long address
;
929 for (address
= start
; address
<= VMALLOC_END
; address
+= PGDIR_SIZE
) {
930 const pgd_t
*pgd_ref
= pgd_offset_k(address
);
934 if (pgd_none(*pgd_ref
))
936 spin_lock_irqsave(&pgd_lock
, flags
);
937 list_for_each_entry(page
, &pgd_list
, lru
) {
939 pgd
= (pgd_t
*)page_address(page
) + pgd_index(address
);
941 set_pgd(pgd
, *pgd_ref
);
943 BUG_ON(pgd_page_vaddr(*pgd
) != pgd_page_vaddr(*pgd_ref
));
945 spin_unlock_irqrestore(&pgd_lock
, flags
);
This page took 0.163527 seconds and 5 git commands to generate.