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Will Deacon c8f487a49a arm64: mm: ensure that the zero page is visible to the page table walker 
commit 32d6397805d00573ce1fa55f408ce2bca15b0ad3 upstream.

In paging_init, we allocate the zero page, memset it to zero and then
point TTBR0 to it in order to avoid speculative fetches through the
identity mapping.

In order to guarantee that the freshly zeroed page is indeed visible to
the page table walker, we need to execute a dsb instruction prior to
writing the TTBR.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2016-01-28 21:49:36 -08:00
..
alpha vm: add VM_FAULT_SIGSEGV handling support 2015-04-29 10:34:00 +02:00
arc ARC: make sure instruction_pointer() returns unsigned value 2015-08-10 12:20:30 -07:00
arm ARM: orion: Fix DSA platform device after mvmdio conversion 2015-12-09 13:40:08 -05:00
arm64 arm64: mm: ensure that the zero page is visible to the page table walker 2016-01-28 21:49:36 -08:00
avr32 vm: add VM_FAULT_SIGSEGV handling support 2015-04-29 10:34:00 +02:00
blackfin blackfin updates for Linux 3.10 2013-05-10 07:21:16 -07:00
c6x C6x: time: Ensure consistency in __init 2015-05-06 21:56:28 +02:00
cris vm: add VM_FAULT_SIGSEGV handling support 2015-04-29 10:34:00 +02:00
frv vm: add VM_FAULT_SIGSEGV handling support 2015-04-29 10:34:00 +02:00
h8300 We get rid of the general module prefix confusion with a binary config option, 2013-05-05 10:58:06 -07:00
hexagon arch: mm: pass userspace fault flag to generic fault handler 2014-11-21 09:22:56 -08:00
ia64 vm: add VM_FAULT_SIGSEGV handling support 2015-04-29 10:34:00 +02:00
m32r vm: add VM_FAULT_SIGSEGV handling support 2015-04-29 10:34:00 +02:00
m68k m68k/uaccess: Fix asm constraints for userspace access 2015-10-27 09:44:49 +09:00
metag vm: add VM_FAULT_SIGSEGV handling support 2015-04-29 10:34:00 +02:00
microblaze vm: add VM_FAULT_SIGSEGV handling support 2015-04-29 10:34:00 +02:00
mips MIPS: dma-default: Fix 32-bit fall back to GFP_DMA 2015-10-22 14:37:52 -07:00
mn10300 vm: add VM_FAULT_SIGSEGV handling support 2015-04-29 10:34:00 +02:00
openrisc vm: add VM_FAULT_SIGSEGV handling support 2015-04-29 10:34:00 +02:00
parisc parisc: Filter out spurious interrupts in PA-RISC irq handler 2015-10-01 12:07:32 +02:00
powerpc powerpc: Make {cmp}xchg* and their atomic_ versions fully ordered 2016-01-28 21:49:35 -08:00
s390 s390/sclp: clear upper register halves in _sclp_print_early 2015-08-10 12:20:29 -07:00
score vm: add VM_FAULT_SIGSEGV handling support 2015-04-29 10:34:00 +02:00
sh nosave: consolidate __nosave_{begin,end} in <asm/sections.h> 2015-05-06 21:56:28 +02:00
sparc crypto: sparc - initialize blkcipher.ivsize 2015-10-27 09:44:49 +09:00
tile tile: use free_bootmem_late() for initrd 2015-08-10 12:20:30 -07:00
um vm: add VM_FAULT_SIGSEGV handling support 2015-04-29 10:34:00 +02:00
unicore32 nosave: consolidate __nosave_{begin,end} in <asm/sections.h> 2015-05-06 21:56:28 +02:00
x86 x86/boot: Double BOOT_HEAP_SIZE to 64KB 2016-01-28 21:49:28 -08:00
xtensa xtensa: don't use echo -e needlessly 2015-09-21 10:00:10 -07:00
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Kconfig microblaze: fix clone syscall 2013-08-20 08:43:02 -07:00