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c8f3cc0b65
linux/arch/mips
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David Daney c8f3cc0b65 MIPS: Don't vmap things at address zero. 
In the 64-bit kernel we use swapper_pg_dir for three different things.

1) xuseg mappings for kernel threads.

2) vmap mappings for all kernel-space accesses in xkseg.

3) vmap mappings for kernel modules in ksseg (kseg2).

Due to how the TLB refill handlers work, any mapping established in
xkseg or ksseg will also establish a xuseg mapping that should never
be used by the kernel.

In order to be able to use exceptions to trap NULL pointer
dereferences, we need to ensure that nothing is mapped at address
zero.  Since vmap mappings in xkseg are reflected in xuseg, this means
we need to ensure that there are no vmap mappings established at the
start of xkseg.  So we move back VMALLOC_START to avoid establishing
vmap mappings at the start of xkseg.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1129/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-04-30 20:52:41 +01:00
..
alchemy MIPS: Alchemy: DB1200: Remove custom wait implementation 2010-04-12 17:26:22 +01:00
ar7 MIPS: AR7: Fix phat finger of cpmac fixed_phy_add 2010-04-12 17:26:13 +01:00
bcm47xx MIPS: Nuke trailing blank lines 2010-02-27 12:53:14 +01:00
bcm63xx MIPS: BCM63xx: Fix build failure in board_bcm963xx.c 2010-04-12 17:26:20 +01:00
boot MIPS: Make the debugging of compressed kernel configurable 2010-02-27 12:53:24 +01:00
cavium-octeon MIPS: Octeon: Remove redundant declaration of octeon_reserve32_memory 2010-04-12 17:26:10 +01:00
cobalt MIPS: Cobalt: Fix theoretical port aliasing issue 2010-02-27 12:53:43 +01:00
configs MIPS: Big Sur: Make defconfig more useful. 2010-04-12 17:26:22 +01:00
dec MIPS: DEC: Convert KN01 lock to raw spinlock. 2010-02-27 12:53:36 +01:00
emma MIPS: Remove useless zero initializations. 2009-09-17 20:07:51 +02:00
fw MIPS: IP22: Remove an unused function 2009-12-17 01:56:56 +00:00
gt64120/wrppmc Update Yoichi Yuasa's e-mail address 2009-07-03 15:45:29 +01:00
include/asm MIPS: Don't vmap things at address zero. 2010-04-30 20:52:41 +01:00
jazz include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
kernel MIPS: Calculate proper ebase value for 64-bit kernels 2010-04-12 17:26:22 +01:00
lasat MIPS: Nuke trailing blank lines 2010-02-27 12:53:14 +01:00
lib MIPS: libgcc.h: Checkpatch cleanup 2010-04-12 17:26:15 +01:00
loongson MIPS: Lemote 2F: Move printks out of port_access_lock. 2010-02-27 12:53:41 +01:00
math-emu MIPS: Nuke trailing blank lines 2010-02-27 12:53:14 +01:00
mipssim include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
mm MIPS: Fix __vmalloc() etc. on MIPS for non-GPL modules 2010-04-12 17:26:21 +01:00
mti-malta include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
nxp MIPS: PNX8550: Fix build error, broken by: 2010-04-30 20:52:39 +01:00
oprofile MIPS: Loongson: Remove pointless sample_lock from oprofile code. 2010-02-27 12:53:39 +01:00
pci MIPS: Lemote 2F: Ensure atomic execution of _rdmsr and _wrmsr 2010-04-12 17:26:12 +01:00
pmc-sierra include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
power MIPS: Loongson: Change the Email address of Wu Zhangjin 2010-02-27 12:53:12 +01:00
powertv include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
rb532 include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
sgi-ip22 MIPS: Move several variables from .bss to .init.data 2009-12-17 01:57:27 +00:00
sgi-ip27 include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
sgi-ip32 include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
sibyte MIPS: Sibyte: Apply M3 workaround only on affected chip types and versions. 2010-04-12 17:26:19 +01:00
sni MIPS: SNI: Convert sni_rm200_i8259A_lock to raw spinlock. 2010-02-27 12:53:39 +01:00
txx9 include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
vr41xx MIPS: VR41xx: Use strlcat() for the command line arguments 2010-01-12 18:19:30 +01:00
Kconfig pci-dma: mips: use include/linux/pci-dma.h 2010-03-12 15:52:41 -08:00
Kconfig.debug MIPS: Crazy spinlock speed test. 2010-02-27 12:53:42 +01:00
Makefile MIPS: Loongson: arch/mips/Makefile: Add missing whitespace 2010-02-27 12:53:11 +01:00