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John David Anglin c78e710c1c parisc: Purge TLB before setting PTE 
The attached change interchanges the order of purging the TLB and
setting the corresponding page table entry.  TLB purges are strongly
ordered.  It occurred to me one night that setting the PTE first might
have subtle ordering issues on SMP machines and cause random memory
corruption.

A TLB lock guards the insertion of user TLB entries.  So after the TLB
is purged, a new entry can't be inserted until the lock is released.
This ensures that the new PTE value is used when the lock is released.

Since making this change, no random segmentation faults have been
observed on the Debian hppa buildd servers.

Signed-off-by: John David Anglin  <dave.anglin@bell.net>
Cc: <stable@vger.kernel.org> # v3.16+
Signed-off-by: Helge Deller <deller@gmx.de>
2016-12-07 08:56:40 +01:00
..
agp.h
asm-offsets.h
asmregs.h
assembly.h parisc: Use generic extable search and sort routines 2016-03-23 16:00:46 +01:00
atomic.h locking/atomic: Remove linux/atomic.h:atomic_fetch_or() 2016-06-16 10:48:32 +02:00
bitops.h arch,parisc: Convert smp_mb__*() 2014-04-18 14:20:41 +02:00
bug.h [PARISC] fix missing TAINT_WARN problem 2012-06-05 14:10:17 +09:00
bugs.h
cache.h arch: Introduce post-init read-only memory 2016-02-22 08:51:38 +01:00
cacheflush.h asm-generic: Consolidate mark_rodata_ro() 2016-02-22 08:51:37 +01:00
checksum.h ipv6: Pass proto to csum_ipv6_magic as __u8 instead of unsigned short 2016-03-13 23:55:13 -04:00
cmpxchg.h parisc: Add native high-resolution sched_clock() implementation 2016-05-22 21:39:25 +02:00
compat.h parisc: Fix SIGSYS signals in compat case 2016-03-31 12:28:37 +02:00
compat_ucontext.h
current.h
delay.h parisc: make udelay() SMP-safe 2013-11-07 22:28:26 +01:00
dma-mapping.h dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
dma.h Disintegrate asm/system.h for PA-RISC 2012-03-28 18:30:02 +01:00
dwarf.h parisc: Add cfi_startproc and cfi_endproc to assembly code 2016-10-05 22:54:40 +02:00
eisa_bus.h
eisa_eeprom.h parisc: Fix typos in eisa_eeprom.h 2016-05-22 21:57:40 +02:00
elf.h parisc,metag: Fix crashes due to stack randomization on stack-grows-upwards architectures 2015-05-12 22:03:44 +02:00
fb.h
fixmap.h
floppy.h parisc: Use parentheses around expression in floppy.h 2016-03-01 22:51:04 +01:00
ftrace.h parisc: Add syscall tracepoint support 2016-05-22 21:38:47 +02:00
futex.h parisc: Update futex.h to match generic implementation 2016-05-22 21:48:54 +02:00
grfioctl.h
hardirq.h parisc: do not count IPI calls twice 2013-11-07 22:28:54 +01:00
hardware.h parisc: drop include of asm/pdc.h from asm/hardware.h 2012-05-10 15:12:08 -07:00
hash.h parisc: Add <asm/hash.h> 2016-08-02 16:44:29 +02:00
hugetlb.h parisc: Protect huge page pte changes with spinlocks 2016-01-16 19:19:14 +01:00
ide.h
io.h parisc: Define ioremap_uc and ioremap_wc 2015-09-08 15:30:37 +02:00
irq.h
irqflags.h
kbdleds.h keyboard: Use BIOS Keyboard variable to set Numlock 2012-05-08 14:19:41 -07:00
Kbuild mm: clean up per architecture MM hook header files 2015-07-17 16:39:53 -07:00
kmap_types.h
ldcw.h parisc: Fix typo in ldcw.h 2016-05-22 21:56:37 +02:00
led.h
linkage.h parisc: Add cfi_startproc and cfi_endproc to assembly code 2016-10-05 22:54:40 +02:00
machdep.h
mckinley.h
mmu.h
mmu_context.h atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
mmzone.h parisc: fix kernel BUG at arch/parisc/include/asm/mmzone.h:50 (part 2) 2013-06-18 20:20:21 +02:00
module.h Make most arch asm/module.h files use asm-generic/module.h 2012-09-28 14:31:03 +09:30
page.h parisc: Add defines for Huge page support 2015-11-22 12:22:34 +01:00
parisc-device.h parisc: Fix interrupt routing for C8000 serial ports 2013-07-31 23:42:32 +02:00
parport.h ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
pci.h PCI: Move pci_dma_* helpers to common code 2016-03-07 10:40:02 -06:00
pdc.h parisc: Imporove debug info about space registers and TLB configuration 2016-01-12 22:12:09 +01:00
pdc_chassis.h
pdcpat.h
perf.h
perf_event.h
pgalloc.h parisc: get rid of superfluous __GFP_REPEAT 2016-06-24 17:23:52 -07:00
pgtable.h parisc: Purge TLB before setting PTE 2016-12-07 08:56:40 +01:00
prefetch.h [PARISC] fix panic on prefetch(NULL) on PA7300LC 2012-05-16 13:15:21 +01:00
processor.h parisc: Reduce overhead of parisc_requires_coherency() 2016-01-12 22:03:36 +01:00
psw.h Disintegrate asm/system.h for PA-RISC 2012-03-28 18:30:02 +01:00
ptrace.h parisc: add kernel audit feature 2013-11-07 22:27:20 +01:00
ropes.h
rt_sigframe.h
runway.h
sections.h
serial.h parisc: remove empty SERIAL_PORT_DFNS in serial.h 2013-11-30 21:02:18 +01:00
shmparam.h parisc: change value of SHMLBA from 0x00400000 to PAGE_SIZE 2014-04-13 15:00:53 +02:00
signal.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2013-02-23 18:50:11 -08:00
smp.h [PARISC] Fix parisc compile failure after smp: Add task_struct argument to __cpu_up() 2012-05-25 12:35:45 +01:00
socket.h parisc: break out SOCK_NONBLOCK define to own asm header file 2013-11-19 23:36:17 +01:00
special_insns.h parisc: optimize mtsp(0,sr) inline assembly 2013-07-09 22:09:21 +02:00
spinlock.h locking/spinlock, arch: Update and fix spin_unlock_wait() implementations 2016-06-14 11:55:15 +02:00
spinlock_types.h
string.h
superio.h
switch_to.h Disintegrate asm/system.h for PA-RISC 2012-03-28 18:30:02 +01:00
syscall.h parisc: Add syscall tracepoint support 2016-05-22 21:38:47 +02:00
termios.h UAPI: (Scripted) Disintegrate arch/parisc/include/asm 2012-10-16 21:28:05 +01:00
thread_info.h parisc: Add syscall tracepoint support 2016-05-22 21:38:47 +02:00
timex.h Disintegrate asm/system.h for PA-RISC 2012-03-28 18:30:02 +01:00
tlb.h
tlbflush.h parisc: Fix some PTE/TLB race conditions and optimize __flush_tlb_range based on timing results 2015-07-10 21:47:47 +02:00
traps.h parisc: Show trap name in kernel crash 2016-10-11 20:52:47 +02:00
uaccess.h parisc: Add hardened usercopy feature 2016-10-06 22:10:19 +02:00
ucontext.h
unaligned.h
unistd.h sys_sgetmask/sys_ssetmask: add CONFIG_SGETMASK_SYSCALL 2014-06-04 16:54:14 -07:00
unwind.h