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mm: fault feedback #2

Browse source 
This patch completes Linus's wish that the fault return codes be made into
bit flags, which I agree makes everything nicer.  This requires requires
all handle_mm_fault callers to be modified (possibly the modifications
should go further and do things like fault accounting in handle_mm_fault --
however that would be for another patch).

[akpm@linux-foundation.org: fix alpha build]
[akpm@linux-foundation.org: fix s390 build]
[akpm@linux-foundation.org: fix sparc build]
[akpm@linux-foundation.org: fix sparc64 build]
[akpm@linux-foundation.org: fix ia64 build]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ian Molton <spyro@f2s.com>
Cc: Bryan Wu <bryan.wu@analog.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Greg Ungerer <gerg@uclinux.org>
Cc: Matthew Wilcox <willy@debian.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Cc: Richard Curnow <rc@rc0.org.uk>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
Cc: Chris Zankel <chris@zankel.net>
Acked-by: Kyle McMartin <kyle@mcmartin.ca>
Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
[ Still apparently needs some ARM and PPC loving - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin 2007-07-19 01:47:05 -07:00 committed by Linus Torvalds
parent d0217ac04c
commit 83c54070ee
32 changed files with 376 additions and 422 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
arch/alpha/mm/fault.c
View file

@ -148,21 +148,17 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
the fault. */
fault = handle_mm_fault(mm, vma, address, cause > 0);
up_read(&mm->mmap_sem);
switch (fault) {
case VM_FAULT_MINOR:
current->min_flt++;
break;
case VM_FAULT_MAJOR:
current->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
case VM_FAULT_OOM:
goto out_of_memory;
default:
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
return;
/* Something tried to access memory that isn't in our memory map.

38
arch/arm/mm/fault.c
View file

@ -183,20 +183,20 @@ __do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
*/
survive:
fault = handle_mm_fault(mm, vma, addr & PAGE_MASK, fsr & (1 << 11));
/*
* Handle the "normal" cases first - successful and sigbus
*/
switch (fault) {
case VM_FAULT_MAJOR:
tsk->maj_flt++;
return fault;
case VM_FAULT_MINOR:
tsk->min_flt++;
case VM_FAULT_SIGBUS:
return fault;
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
return fault;
BUG();
}
if (fault & VM_FAULT_MAJOR)
tsk->maj_flt++;
else
tsk->min_flt++;
return fault;
out_of_memory:
if (!is_init(tsk))
goto out;
@ -249,7 +249,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
/*
* Handle the "normal" case first - VM_FAULT_MAJOR / VM_FAULT_MINOR
*/
if (fault >= VM_FAULT_MINOR)
if (likely(!(fault & VM_FAULT_ERROR)))
return 0;
/*
@ -259,8 +259,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
if (!user_mode(regs))
goto no_context;
switch (fault) {
case VM_FAULT_OOM:
if (fault & VM_FAULT_OOM) {
/*
* We ran out of memory, or some other thing
* happened to us that made us unable to handle
@ -269,17 +268,15 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
printk("VM: killing process %s\n", tsk->comm);
do_exit(SIGKILL);
return 0;
case VM_FAULT_SIGBUS:
}
if (fault & VM_FAULT_SIGBUS) {
/*
* We had some memory, but were unable to
* successfully fix up this page fault.
*/
sig = SIGBUS;
code = BUS_ADRERR;
break;
default:
} else {
/*
* Something tried to access memory that
* isn't in our memory map..
@ -287,7 +284,6 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
sig = SIGSEGV;
code = fault == VM_FAULT_BADACCESS ?
SEGV_ACCERR : SEGV_MAPERR;
break;
}
__do_user_fault(tsk, addr, fsr, sig, code, regs);

32
arch/arm26/mm/fault.c
View file

@ -170,20 +170,20 @@ __do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
*/
survive:
fault = handle_mm_fault(mm, vma, addr & PAGE_MASK, DO_COW(fsr));
/*
* Handle the "normal" cases first - successful and sigbus
*/
switch (fault) {
case VM_FAULT_MAJOR:
tsk->maj_flt++;
return fault;
case VM_FAULT_MINOR:
tsk->min_flt++;
case VM_FAULT_SIGBUS:
return fault;
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
return fault;
BUG();
}
if (fault & VM_FAULT_MAJOR)
tsk->maj_flt++;
else
tsk->min_flt++;
return fault;
out_of_memory:
fault = -3; /* out of memory */
if (!is_init(tsk))
goto out;
@ -225,13 +225,11 @@ int do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
/*
* Handle the "normal" case first
*/
switch (fault) {
case VM_FAULT_MINOR:
case VM_FAULT_MAJOR:
if (likely(!(fault & VM_FAULT_ERROR)))
return 0;
case VM_FAULT_SIGBUS:
if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
}
/* else VM_FAULT_OOM */
/*
* If we are in kernel mode at this point, we

23
arch/avr32/mm/fault.c
View file

@ -64,6 +64,7 @@ asmlinkage void do_page_fault(unsigned long ecr, struct pt_regs *regs)
int writeaccess;
long signr;
int code;
int fault;
if (notify_page_fault(regs, ecr))
return;
@ -132,20 +133,18 @@ asmlinkage void do_page_fault(unsigned long ecr, struct pt_regs *regs)
* fault.
*/
survive:
switch (handle_mm_fault(mm, vma, address, writeaccess)) {
case VM_FAULT_MINOR:
tsk->min_flt++;
break;
case VM_FAULT_MAJOR:
tsk->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
case VM_FAULT_OOM:
goto out_of_memory;
default:
fault = handle_mm_fault(mm, vma, address, writeaccess);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
tsk->maj_flt++;
else
tsk->min_flt++;
up_read(&mm->mmap_sem);
return;

23
arch/cris/mm/fault.c
View file

@ -179,6 +179,7 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
struct mm_struct *mm;
struct vm_area_struct * vma;
siginfo_t info;
int fault;
D(printk("Page fault for %lX on %X at %lX, prot %d write %d\n",
address, smp_processor_id(), instruction_pointer(regs),
@ -283,18 +284,18 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
* the fault.
*/
switch (handle_mm_fault(mm, vma, address, writeaccess & 1)) {
case VM_FAULT_MINOR:
tsk->min_flt++;
break;
case VM_FAULT_MAJOR:
tsk->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
default:
goto out_of_memory;
fault = handle_mm_fault(mm, vma, address, writeaccess & 1);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
tsk->maj_flt++;
else
tsk->min_flt++;
up_read(&mm->mmap_sem);
return;

23
arch/frv/mm/fault.c
View file

@ -40,6 +40,7 @@ asmlinkage void do_page_fault(int datammu, unsigned long esr0, unsigned long ear
pud_t *pue;
pte_t *pte;
int write;
int fault;
#if 0
const char *atxc[16] = {
@ -162,18 +163,18 @@ asmlinkage void do_page_fault(int datammu, unsigned long esr0, unsigned long ear
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
switch (handle_mm_fault(mm, vma, ear0, write)) {
case VM_FAULT_MINOR:
current->min_flt++;
break;
case VM_FAULT_MAJOR:
current->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
default:
goto out_of_memory;
fault = handle_mm_fault(mm, vma, ear0, write);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
up_read(&mm->mmap_sem);
return;

23
arch/i386/mm/fault.c
View file

@ -303,6 +303,7 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs,
struct vm_area_struct * vma;
unsigned long address;
int write, si_code;
int fault;
/* get the address */
address = read_cr2();
@ -422,20 +423,18 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs,
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
switch (handle_mm_fault(mm, vma, address, write)) {
case VM_FAULT_MINOR:
tsk->min_flt++;
break;
case VM_FAULT_MAJOR:
tsk->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
case VM_FAULT_OOM:
fault = handle_mm_fault(mm, vma, address, write);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
default:
BUG();
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
tsk->maj_flt++;
else
tsk->min_flt++;
/*
* Did it hit the DOS screen memory VA from vm86 mode?

26
arch/ia64/mm/fault.c
View file

@ -80,6 +80,7 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
struct mm_struct *mm = current->mm;
struct siginfo si;
unsigned long mask;
int fault;
/* mmap_sem is performance critical.... */
prefetchw(&mm->mmap_sem);
@ -147,26 +148,25 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
* sure we exit gracefully rather than endlessly redo the
* fault.
*/
switch (handle_mm_fault(mm, vma, address, (mask & VM_WRITE) != 0)) {
case VM_FAULT_MINOR:
++current->min_flt;
break;
case VM_FAULT_MAJOR:
++current->maj_flt;
break;
case VM_FAULT_SIGBUS:
fault = handle_mm_fault(mm, vma, address, (mask & VM_WRITE) != 0);
if (unlikely(fault & VM_FAULT_ERROR)) {
/*
* We ran out of memory, or some other thing happened
* to us that made us unable to handle the page fault
* gracefully.
*/
signal = SIGBUS;
goto bad_area;
case VM_FAULT_OOM:
goto out_of_memory;
default:
if (fault & VM_FAULT_OOM) {
goto out_of_memory;
} else if (fault & VM_FAULT_SIGBUS) {
signal = SIGBUS;
goto bad_area;
}
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
up_read(&mm->mmap_sem);
return;

23
arch/m32r/mm/fault.c
View file

@ -80,6 +80,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
struct vm_area_struct * vma;
unsigned long page, addr;
int write;
int fault;
siginfo_t info;
/*
@ -195,20 +196,18 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
*/
addr = (address & PAGE_MASK);
set_thread_fault_code(error_code);
switch (handle_mm_fault(mm, vma, addr, write)) {
case VM_FAULT_MINOR:
tsk->min_flt++;
break;
case VM_FAULT_MAJOR:
tsk->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
case VM_FAULT_OOM:
fault = handle_mm_fault(mm, vma, addr, write);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
default:
BUG();
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
tsk->maj_flt++;
else
tsk->min_flt++;
set_thread_fault_code(0);
up_read(&mm->mmap_sem);
return;

21
arch/m68k/mm/fault.c
View file

@ -159,18 +159,17 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
#ifdef DEBUG
printk("handle_mm_fault returns %d\n",fault);
#endif
switch (fault) {
case VM_FAULT_MINOR:
current->min_flt++;
break;
case VM_FAULT_MAJOR:
current->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto bus_err;
default:
goto out_of_memory;
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto bus_err;
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
up_read(&mm->mmap_sem);
return 0;

23
arch/mips/mm/fault.c
View file

@ -39,6 +39,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
struct mm_struct *mm = tsk->mm;
const int field = sizeof(unsigned long) * 2;
siginfo_t info;
int fault;
#if 0
printk("Cpu%d[%s:%d:%0*lx:%ld:%0*lx]\n", raw_smp_processor_id(),
@ -102,20 +103,18 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
switch (handle_mm_fault(mm, vma, address, write)) {
case VM_FAULT_MINOR:
tsk->min_flt++;
break;
case VM_FAULT_MAJOR:
tsk->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
case VM_FAULT_OOM:
goto out_of_memory;
default:
fault = handle_mm_fault(mm, vma, address, write);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
tsk->maj_flt++;
else
tsk->min_flt++;
up_read(&mm->mmap_sem);
return;

23
arch/parisc/mm/fault.c
View file

@ -147,6 +147,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
struct mm_struct *mm = tsk->mm;
const struct exception_table_entry *fix;
unsigned long acc_type;
int fault;
if (in_atomic() || !mm)
goto no_context;
@ -173,23 +174,23 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
* fault.
*/
switch (handle_mm_fault(mm, vma, address, (acc_type & VM_WRITE) != 0)) {
case VM_FAULT_MINOR:
++current->min_flt;
break;
case VM_FAULT_MAJOR:
++current->maj_flt;
break;
case VM_FAULT_SIGBUS:
fault = handle_mm_fault(mm, vma, address, (acc_type & VM_WRITE) != 0);
if (unlikely(fault & VM_FAULT_ERROR)) {
/*
* We hit a shared mapping outside of the file, or some
* other thing happened to us that made us unable to
* handle the page fault gracefully.
*/
goto bad_area;
default:
goto out_of_memory;
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto bad_area;
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
up_read(&mm->mmap_sem);
return;

26
arch/powerpc/mm/fault.c
View file

@ -145,7 +145,7 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
struct mm_struct *mm = current->mm;
siginfo_t info;
int code = SEGV_MAPERR;
int is_write = 0;
int is_write = 0, ret;
int trap = TRAP(regs);
int is_exec = trap == 0x400;
@ -330,22 +330,18 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
* the fault.
*/
survive:
switch (handle_mm_fault(mm, vma, address, is_write)) {
case VM_FAULT_MINOR:
current->min_flt++;
break;
case VM_FAULT_MAJOR:
current->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
case VM_FAULT_OOM:
goto out_of_memory;
default:
ret = handle_mm_fault(mm, vma, address, is_write);
if (unlikely(ret & VM_FAULT_ERROR)) {
if (ret & VM_FAULT_OOM)
goto out_of_memory;
else if (ret & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (ret & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
up_read(&mm->mmap_sem);
return 0;

28
arch/powerpc/platforms/cell/spufs/fault.c
View file

@ -74,23 +74,21 @@ static int spu_handle_mm_fault(struct mm_struct *mm, unsigned long ea,
goto bad_area;
}
ret = 0;
*flt = handle_mm_fault(mm, vma, ea, is_write);
switch (*flt) {
case VM_FAULT_MINOR:
current->min_flt++;
break;
case VM_FAULT_MAJOR:
current->maj_flt++;
break;
case VM_FAULT_SIGBUS:
ret = -EFAULT;
goto bad_area;
case VM_FAULT_OOM:
ret = -ENOMEM;
goto bad_area;
default:
fault = handle_mm_fault(mm, vma, ea, is_write);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM) {
ret = -ENOMEM;
goto bad_area;
} else if (fault & VM_FAULT_SIGBUS) {
ret = -EFAULT;
goto bad_area;
}
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
up_read(&mm->mmap_sem);
return ret;

23
arch/ppc/mm/fault.c
View file

@ -96,6 +96,7 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
struct mm_struct *mm = current->mm;
siginfo_t info;
int code = SEGV_MAPERR;
int fault;
#if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
int is_write = error_code & ESR_DST;
#else
@ -249,20 +250,18 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
* the fault.
*/
survive:
switch (handle_mm_fault(mm, vma, address, is_write)) {
case VM_FAULT_MINOR:
current->min_flt++;
break;
case VM_FAULT_MAJOR:
current->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
case VM_FAULT_OOM:
goto out_of_memory;
default:
fault = handle_mm_fault(mm, vma, address, is_write);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
up_read(&mm->mmap_sem);
/*

23
arch/s390/lib/uaccess_pt.c
View file

@ -20,6 +20,7 @@ static int __handle_fault(struct mm_struct *mm, unsigned long address,
{
struct vm_area_struct *vma;
int ret = -EFAULT;
int fault;
if (in_atomic())
return ret;
@ -44,20 +45,18 @@ static int __handle_fault(struct mm_struct *mm, unsigned long address,
}
survive:
switch (handle_mm_fault(mm, vma, address, write_access)) {
case VM_FAULT_MINOR:
current->min_flt++;
break;
case VM_FAULT_MAJOR:
current->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto out_sigbus;
case VM_FAULT_OOM:
goto out_of_memory;
default:
fault = handle_mm_fault(mm, vma, address, write_access);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto out_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
ret = 0;
out:
up_read(&mm->mmap_sem);

30
arch/s390/mm/fault.c
View file

@ -307,6 +307,7 @@ do_exception(struct pt_regs *regs, unsigned long error_code, int write)
unsigned long address;
int space;
int si_code;
int fault;
if (notify_page_fault(regs, error_code))
return;
@ -377,23 +378,22 @@ do_exception(struct pt_regs *regs, unsigned long error_code, int write)
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
switch (handle_mm_fault(mm, vma, address, write)) {
case VM_FAULT_MINOR:
tsk->min_flt++;
break;
case VM_FAULT_MAJOR:
tsk->maj_flt++;
break;
case VM_FAULT_SIGBUS:
do_sigbus(regs, error_code, address);
return;
case VM_FAULT_OOM:
if (do_out_of_memory(regs, error_code, address))
goto survive;
return;
default:
fault = handle_mm_fault(mm, vma, address, write);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM) {
if (do_out_of_memory(regs, error_code, address))
goto survive;
return;
} else if (fault & VM_FAULT_SIGBUS) {
do_sigbus(regs, error_code, address);
return;
}
BUG();
}
if (fault & VM_FAULT_MAJOR)
tsk->maj_flt++;
else
tsk->min_flt++;
up_read(&mm->mmap_sem);
/*

23
arch/sh/mm/fault.c
View file

@ -33,6 +33,7 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
struct mm_struct *mm;
struct vm_area_struct * vma;
int si_code;
int fault;
siginfo_t info;
trace_hardirqs_on();
@ -124,20 +125,18 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
* the fault.
*/
survive:
switch (handle_mm_fault(mm, vma, address, writeaccess)) {
case VM_FAULT_MINOR:
tsk->min_flt++;
break;
case VM_FAULT_MAJOR:
tsk->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
case VM_FAULT_OOM:
fault = handle_mm_fault(mm, vma, address, writeaccess);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
default:
BUG();
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
tsk->maj_flt++;
else
tsk->min_flt++;
up_read(&mm->mmap_sem);
return;

24
arch/sh64/mm/fault.c
View file

@ -127,6 +127,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long writeaccess,
struct vm_area_struct * vma;
const struct exception_table_entry *fixup;
pte_t *pte;
int fault;
#if defined(CONFIG_SH64_PROC_TLB)
++calls_to_do_slow_page_fault;
@ -221,18 +222,19 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long writeaccess,
* the fault.
*/
survive:
switch (handle_mm_fault(mm, vma, address, writeaccess)) {
case VM_FAULT_MINOR:
tsk->min_flt++;
break;
case VM_FAULT_MAJOR:
tsk->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
default:
goto out_of_memory;
fault = handle_mm_fault(mm, vma, address, writeaccess);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
tsk->maj_flt++;
else
tsk->min_flt++;
/* If we get here, the page fault has been handled. Do the TLB refill
now from the newly-setup PTE, to avoid having to fault again right
away on the same instruction. */

24
arch/sparc/mm/fault.c
View file

@ -226,6 +226,7 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
unsigned long g2;
siginfo_t info;
int from_user = !(regs->psr & PSR_PS);
int fault;
if(text_fault)
address = regs->pc;
@ -289,19 +290,18 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
switch (handle_mm_fault(mm, vma, address, write)) {
case VM_FAULT_SIGBUS:
goto do_sigbus;
case VM_FAULT_OOM:
goto out_of_memory;
case VM_FAULT_MAJOR:
current->maj_flt++;
break;
case VM_FAULT_MINOR:
default:
current->min_flt++;
break;
fault = handle_mm_fault(mm, vma, address, write);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
up_read(&mm->mmap_sem);
return;

24
arch/sparc64/mm/fault.c
View file

@ -278,7 +278,7 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
unsigned int insn = 0;
int si_code, fault_code;
int si_code, fault_code, fault;
unsigned long address, mm_rss;
fault_code = get_thread_fault_code();
@ -415,20 +415,18 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
goto bad_area;
}
switch (handle_mm_fault(mm, vma, address, (fault_code & FAULT_CODE_WRITE))) {
case VM_FAULT_MINOR:
current->min_flt++;
break;
case VM_FAULT_MAJOR:
current->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
case VM_FAULT_OOM:
goto out_of_memory;
default:
fault = handle_mm_fault(mm, vma, address, (fault_code & FAULT_CODE_WRITE));
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
up_read(&mm->mmap_sem);

29
arch/um/kernel/trap.c
View file

@ -76,23 +76,24 @@ int handle_page_fault(unsigned long address, unsigned long ip,
goto out;
do {
int fault;
survive:
switch (handle_mm_fault(mm, vma, address, is_write)){
case VM_FAULT_MINOR:
current->min_flt++;
break;
case VM_FAULT_MAJOR:
current->maj_flt++;
break;
case VM_FAULT_SIGBUS:
err = -EACCES;
goto out;
case VM_FAULT_OOM:
err = -ENOMEM;
goto out_of_memory;
default:
fault = handle_mm_fault(mm, vma, address, is_write);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM) {
err = -ENOMEM;
goto out_of_memory;
} else if (fault & VM_FAULT_SIGBUS) {
err = -EACCES;
goto out;
}
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
pgd = pgd_offset(mm, address);
pud = pud_offset(pgd, address);
pmd = pmd_offset(pud, address);

25
arch/x86_64/mm/fault.c
View file

@ -317,7 +317,7 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
struct vm_area_struct * vma;
unsigned long address;
const struct exception_table_entry *fixup;
int write;
int write, fault;
unsigned long flags;
siginfo_t info;
@ -450,19 +450,18 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
switch (handle_mm_fault(mm, vma, address, write)) {
case VM_FAULT_MINOR:
tsk->min_flt++;
break;
case VM_FAULT_MAJOR:
tsk->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
default:
goto out_of_memory;
fault = handle_mm_fault(mm, vma, address, write);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
tsk->maj_flt++;
else
tsk->min_flt++;
up_read(&mm->mmap_sem);
return;

23
arch/xtensa/mm/fault.c
View file

@ -41,6 +41,7 @@ void do_page_fault(struct pt_regs *regs)
siginfo_t info;
int is_write, is_exec;
int fault;
info.si_code = SEGV_MAPERR;
@ -102,20 +103,18 @@ void do_page_fault(struct pt_regs *regs)
* the fault.
*/
survive:
switch (handle_mm_fault(mm, vma, address, is_write)) {
case VM_FAULT_MINOR:
current->min_flt++;
break;
case VM_FAULT_MAJOR:
current->maj_flt++;
break;
case VM_FAULT_SIGBUS:
goto do_sigbus;
case VM_FAULT_OOM:
goto out_of_memory;
default:
fault = handle_mm_fault(mm, vma, address, is_write);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
up_read(&mm->mmap_sem);
return;

11
fs/gfs2/ops_vm.c
View file

@ -112,7 +112,7 @@ static int gfs2_sharewrite_fault(struct vm_area_struct *vma,
struct gfs2_holder i_gh;
int alloc_required;
int error;
int ret = VM_FAULT_MINOR;
int ret = 0;
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
if (error)
@ -132,14 +132,19 @@ static int gfs2_sharewrite_fault(struct vm_area_struct *vma,
set_bit(GFF_EXLOCK, &gf->f_flags);
ret = filemap_fault(vma, vmf);
clear_bit(GFF_EXLOCK, &gf->f_flags);
if (ret & (VM_FAULT_ERROR | FAULT_RET_NOPAGE))
if (ret & VM_FAULT_ERROR)
goto out_unlock;
if (alloc_required) {
/* XXX: do we need to drop page lock around alloc_page_backing?*/
error = alloc_page_backing(ip, vmf->page);
if (error) {
if (ret & FAULT_RET_LOCKED)
/*
* VM_FAULT_LOCKED should always be the case for
* filemap_fault, but it may not be in a future
* implementation.
*/
if (ret & VM_FAULT_LOCKED)
unlock_page(vmf->page);
page_cache_release(vmf->page);
ret = VM_FAULT_OOM;

58
include/linux/mm.h
View file

@ -196,25 +196,10 @@ extern pgprot_t protection_map[16];
#define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
#define FAULT_RET_NOPAGE 0x0100 /* ->fault did not return a page. This
* can be used if the handler installs
* their own pte.
*/
#define FAULT_RET_LOCKED 0x0200 /* ->fault locked the page, caller must
* unlock after installing the mapping.
* This is used by pagecache in
* particular, where the page lock is
* used to synchronise against truncate
* and invalidate. Mutually exclusive
* with FAULT_RET_NOPAGE.
*/
/*
* vm_fault is filled by the the pagefault handler and passed to the vma's
* ->fault function. The vma's ->fault is responsible for returning the
* VM_FAULT_xxx type which occupies the lowest byte of the return code, ORed
* with FAULT_RET_ flags that occupy the next byte and give details about
* how the fault was handled.
* ->fault function. The vma's ->fault is responsible for returning a bitmask
* of VM_FAULT_xxx flags that give details about how the fault was handled.
*
* pgoff should be used in favour of virtual_address, if possible. If pgoff
* is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear
@ -226,9 +211,9 @@ struct vm_fault {
void __user *virtual_address; /* Faulting virtual address */
struct page *page; /* ->fault handlers should return a
* page here, unless FAULT_RET_NOPAGE
* page here, unless VM_FAULT_NOPAGE
* is set (which is also implied by
* VM_FAULT_OOM or SIGBUS).
* VM_FAULT_ERROR).
*/
};
@ -712,26 +697,17 @@ static inline int page_mapped(struct page *page)
* just gets major/minor fault counters bumped up.
*/
/*
* VM_FAULT_ERROR is set for the error cases, to make some tests simpler.
*/
#define VM_FAULT_ERROR 0x20
#define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
#define VM_FAULT_OOM (0x00 | VM_FAULT_ERROR)
#define VM_FAULT_SIGBUS (0x01 | VM_FAULT_ERROR)
#define VM_FAULT_MINOR 0x02
#define VM_FAULT_MAJOR 0x03
#define VM_FAULT_OOM 0x0001
#define VM_FAULT_SIGBUS 0x0002
#define VM_FAULT_MAJOR 0x0004
#define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
/*
* Special case for get_user_pages.
* Must be in a distinct bit from the above VM_FAULT_ flags.
*/
#define VM_FAULT_WRITE 0x10
#define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
#define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
/*
* Mask of VM_FAULT_ flags
*/
#define VM_FAULT_MASK 0xff
#define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS)
#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
@ -817,16 +793,8 @@ extern int vmtruncate(struct inode * inode, loff_t offset);
extern int vmtruncate_range(struct inode * inode, loff_t offset, loff_t end);
#ifdef CONFIG_MMU
extern int __handle_mm_fault(struct mm_struct *mm,struct vm_area_struct *vma,
extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, int write_access);
static inline int handle_mm_fault(struct mm_struct *mm,
struct vm_area_struct *vma, unsigned long address,
int write_access)
{
return __handle_mm_fault(mm, vma, address, write_access) &
(~VM_FAULT_WRITE);
}
#else
static inline int handle_mm_fault(struct mm_struct *mm,
struct vm_area_struct *vma, unsigned long address,

21
kernel/futex.c
View file

@ -346,15 +346,20 @@ static int futex_handle_fault(unsigned long address,
vma = find_vma(mm, address);
if (vma && address >= vma->vm_start &&
(vma->vm_flags & VM_WRITE)) {
switch (handle_mm_fault(mm, vma, address, 1)) {
case VM_FAULT_MINOR:
int fault;
fault = handle_mm_fault(mm, vma, address, 1);
if (unlikely((fault & VM_FAULT_ERROR))) {
#if 0
/* XXX: let's do this when we verify it is OK */
if (ret & VM_FAULT_OOM)
ret = -ENOMEM;
#endif
} else {
ret = 0;
current->min_flt++;
break;
case VM_FAULT_MAJOR:
ret = 0;
current->maj_flt++;
break;
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
}
}
if (!fshared)

6
mm/filemap.c
View file

@ -1322,9 +1322,7 @@ int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
struct page *page;
unsigned long size;
int did_readaround = 0;
int ret;
ret = VM_FAULT_MINOR;
int ret = 0;
size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
if (vmf->pgoff >= size)
@ -1408,7 +1406,7 @@ int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
*/
mark_page_accessed(page);
vmf->page = page;
return ret | FAULT_RET_LOCKED;
return ret | VM_FAULT_LOCKED;
outside_data_content:
/*

2
mm/filemap_xip.c
View file

@ -252,7 +252,7 @@ static int xip_file_fault(struct vm_area_struct *area, struct vm_fault *vmf)
out:
page_cache_get(page);
vmf->page = page;
return VM_FAULT_MINOR;
return 0;
}
static struct vm_operations_struct xip_file_vm_ops = {

10
mm/hugetlb.c
View file

@ -469,7 +469,7 @@ static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
avoidcopy = (page_count(old_page) == 1);
if (avoidcopy) {
set_huge_ptep_writable(vma, address, ptep);
return VM_FAULT_MINOR;
return 0;
}
page_cache_get(old_page);
@ -494,7 +494,7 @@ static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
}
page_cache_release(new_page);
page_cache_release(old_page);
return VM_FAULT_MINOR;
return 0;
}
static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
@ -551,7 +551,7 @@ static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
if (idx >= size)
goto backout;
ret = VM_FAULT_MINOR;
ret = 0;
if (!pte_none(*ptep))
goto backout;
@ -602,7 +602,7 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
return ret;
}
ret = VM_FAULT_MINOR;
ret = 0;
spin_lock(&mm->page_table_lock);
/* Check for a racing update before calling hugetlb_cow */
@ -641,7 +641,7 @@ int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
spin_unlock(&mm->page_table_lock);
ret = hugetlb_fault(mm, vma, vaddr, 0);
spin_lock(&mm->page_table_lock);
if (ret == VM_FAULT_MINOR)
if (!(ret & VM_FAULT_MAJOR))
continue;
remainder = 0;

80
mm/memory.c
View file

@ -1068,31 +1068,30 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
cond_resched();
while (!(page = follow_page(vma, start, foll_flags))) {
int ret;
ret = __handle_mm_fault(mm, vma, start,
ret = handle_mm_fault(mm, vma, start,
foll_flags & FOLL_WRITE);
if (ret & VM_FAULT_ERROR) {
if (ret & VM_FAULT_OOM)
return i ? i : -ENOMEM;
else if (ret & VM_FAULT_SIGBUS)
return i ? i : -EFAULT;
BUG();
}
if (ret & VM_FAULT_MAJOR)
tsk->maj_flt++;
else
tsk->min_flt++;
/*
* The VM_FAULT_WRITE bit tells us that do_wp_page has
* broken COW when necessary, even if maybe_mkwrite
* decided not to set pte_write. We can thus safely do
* subsequent page lookups as if they were reads.
* The VM_FAULT_WRITE bit tells us that
* do_wp_page has broken COW when necessary,
* even if maybe_mkwrite decided not to set
* pte_write. We can thus safely do subsequent
* page lookups as if they were reads.
*/
if (ret & VM_FAULT_WRITE)
foll_flags &= ~FOLL_WRITE;
switch (ret & ~VM_FAULT_WRITE) {
case VM_FAULT_MINOR:
tsk->min_flt++;
break;
case VM_FAULT_MAJOR:
tsk->maj_flt++;
break;
case VM_FAULT_SIGBUS:
return i ? i : -EFAULT;
case VM_FAULT_OOM:
return i ? i : -ENOMEM;
default:
BUG();
}
cond_resched();
}
if (pages) {
@ -1639,7 +1638,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
{
struct page *old_page, *new_page;
pte_t entry;
int reuse = 0, ret = VM_FAULT_MINOR;
int reuse = 0, ret = 0;
struct page *dirty_page = NULL;
old_page = vm_normal_page(vma, address, orig_pte);
@ -1835,8 +1834,8 @@ static int unmap_mapping_range_vma(struct vm_area_struct *vma,
/*
* files that support invalidating or truncating portions of the
* file from under mmaped areas must have their ->fault function
* return a locked page (and FAULT_RET_LOCKED code). This provides
* synchronisation against concurrent unmapping here.
* return a locked page (and set VM_FAULT_LOCKED in the return).
* This provides synchronisation against concurrent unmapping here.
*/
again:
@ -2140,7 +2139,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
struct page *page;
swp_entry_t entry;
pte_t pte;
int ret = VM_FAULT_MINOR;
int ret = 0;
if (!pte_unmap_same(mm, pmd, page_table, orig_pte))
goto out;
@ -2208,8 +2207,9 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
unlock_page(page);
if (write_access) {
/* XXX: We could OR the do_wp_page code with this one? */
if (do_wp_page(mm, vma, address,
page_table, pmd, ptl, pte) == VM_FAULT_OOM)
page_table, pmd, ptl, pte) & VM_FAULT_OOM)
ret = VM_FAULT_OOM;
goto out;
}
@ -2280,7 +2280,7 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
lazy_mmu_prot_update(entry);
unlock:
pte_unmap_unlock(page_table, ptl);
return VM_FAULT_MINOR;
return 0;
release:
page_cache_release(page);
goto unlock;
@ -2323,11 +2323,11 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
if (likely(vma->vm_ops->fault)) {
ret = vma->vm_ops->fault(vma, &vmf);
if (unlikely(ret & (VM_FAULT_ERROR | FAULT_RET_NOPAGE)))
return (ret & VM_FAULT_MASK);
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))
return ret;
} else {
/* Legacy ->nopage path */
ret = VM_FAULT_MINOR;
ret = 0;
vmf.page = vma->vm_ops->nopage(vma, address & PAGE_MASK, &ret);
/* no page was available -- either SIGBUS or OOM */
if (unlikely(vmf.page == NOPAGE_SIGBUS))
@ -2340,7 +2340,7 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
* For consistency in subsequent calls, make the faulted page always
* locked.
*/
if (unlikely(!(ret & FAULT_RET_LOCKED)))
if (unlikely(!(ret & VM_FAULT_LOCKED)))
lock_page(vmf.page);
else
VM_BUG_ON(!PageLocked(vmf.page));
@ -2356,7 +2356,8 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
ret = VM_FAULT_OOM;
goto out;
}
page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
page = alloc_page_vma(GFP_HIGHUSER_MOVABLE,
vma, address);
if (!page) {
ret = VM_FAULT_OOM;
goto out;
@ -2384,7 +2385,7 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
* is better done later.
*/
if (!page->mapping) {
ret = VM_FAULT_MINOR;
ret = 0;
anon = 1; /* no anon but release vmf.page */
goto out;
}
@ -2447,7 +2448,7 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
put_page(dirty_page);
}
return (ret & VM_FAULT_MASK);
return ret;
}
static int do_linear_fault(struct mm_struct *mm, struct vm_area_struct *vma,
@ -2486,7 +2487,6 @@ static noinline int do_no_pfn(struct mm_struct *mm, struct vm_area_struct *vma,
spinlock_t *ptl;
pte_t entry;
unsigned long pfn;
int ret = VM_FAULT_MINOR;
pte_unmap(page_table);
BUG_ON(!(vma->vm_flags & VM_PFNMAP));
@ -2498,7 +2498,7 @@ static noinline int do_no_pfn(struct mm_struct *mm, struct vm_area_struct *vma,
else if (unlikely(pfn == NOPFN_SIGBUS))
return VM_FAULT_SIGBUS;
else if (unlikely(pfn == NOPFN_REFAULT))
return VM_FAULT_MINOR;
return 0;
page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
@ -2510,7 +2510,7 @@ static noinline int do_no_pfn(struct mm_struct *mm, struct vm_area_struct *vma,
set_pte_at(mm, address, page_table, entry);
}
pte_unmap_unlock(page_table, ptl);
return ret;
return 0;
}
/*
@ -2531,7 +2531,7 @@ static int do_nonlinear_fault(struct mm_struct *mm, struct vm_area_struct *vma,
pgoff_t pgoff;
if (!pte_unmap_same(mm, pmd, page_table, orig_pte))
return VM_FAULT_MINOR;
return 0;
if (unlikely(!(vma->vm_flags & VM_NONLINEAR) ||
!(vma->vm_flags & VM_CAN_NONLINEAR))) {
@ -2615,13 +2615,13 @@ static inline int handle_pte_fault(struct mm_struct *mm,
}
unlock:
pte_unmap_unlock(pte, ptl);
return VM_FAULT_MINOR;
return 0;
}
/*
* By the time we get here, we already hold the mm semaphore
*/
int __handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, int write_access)
{
pgd_t *pgd;
@ -2650,7 +2650,7 @@ int __handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
return handle_pte_fault(mm, vma, address, pte, pmd, write_access);
}
EXPORT_SYMBOL_GPL(__handle_mm_fault);
EXPORT_SYMBOL_GPL(handle_mm_fault);
#ifndef __PAGETABLE_PUD_FOLDED
/*

8
mm/shmem.c
View file

@ -1103,7 +1103,7 @@ static int shmem_getpage(struct inode *inode, unsigned long idx,
return -EFBIG;
if (type)
*type = VM_FAULT_MINOR;
*type = 0;
/*
* Normally, filepage is NULL on entry, and either found
@ -1138,9 +1138,9 @@ static int shmem_getpage(struct inode *inode, unsigned long idx,
if (!swappage) {
shmem_swp_unmap(entry);
/* here we actually do the io */
if (type && *type == VM_FAULT_MINOR) {
if (type && !(*type & VM_FAULT_MAJOR)) {
__count_vm_event(PGMAJFAULT);
*type = VM_FAULT_MAJOR;
*type |= VM_FAULT_MAJOR;
}
spin_unlock(&info->lock);
swappage = shmem_swapin(info, swap, idx);
@ -1323,7 +1323,7 @@ static int shmem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
return ((error == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS);
mark_page_accessed(vmf->page);
return ret | FAULT_RET_LOCKED;
return ret | VM_FAULT_LOCKED;
}
#ifdef CONFIG_NUMA