linux/arch/x86
Ravikiran G Thirumalai 9e41bff270 x86: fix /dev/mem mmap breakage when PAT is disabled
Impact: allow /dev/mem mmaps on non-PAT CPUs/platforms

Fix mmap to /dev/mem when CONFIG_X86_PAT is off and CONFIG_STRICT_DEVMEM is
off

mmap to /dev/mem on kernel memory has been failing since the
introduction of PAT (CONFIG_STRICT_DEVMEM=n case).   Seems like
the check to avoid cache aliasing with PAT is kicking in even
when PAT is disabled. The bug seems to have crept in 2.6.26.

This patch makes sure that the mmap to regular
kernel memory succeeds if CONFIG_STRICT_DEVMEM=n and
PAT is disabled, and the checks to avoid cache aliasing
still happens if PAT is enabled.

Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Tested-by: Tim Sirianni <tim@scalemp.com>
Cc: <stable@kernel.org>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-30 23:54:41 +01:00
..
boot Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-10-23 12:38:39 -07:00
configs x86: remove irqbalance in kernel for 32 bit 2008-10-16 16:52:52 +02:00
crypto crypto: crc32c - Use Intel CRC32 instruction 2008-08-29 15:49:50 +10:00
ia32 compat: generic compat get/settimeofday 2008-10-16 11:21:33 -07:00
include/asm x86, uv: fix compile error in uv_hub.h 2008-10-30 19:38:46 +01:00
kernel x86: use CONFIG_X86_SMP instead of CONFIG_SMP 2008-10-30 22:53:10 +01:00
kvm Merge commit 'linus/master' into merge-linus 2008-10-17 09:20:26 -07:00
lguest x86: make 32bit support per_cpu vector 2008-10-16 16:52:53 +02:00
lib Merge branch 'x86/unify-cpu-detect' into x86-v28-for-linus-phase4-D 2008-10-11 20:23:20 +02:00
mach-default Merge branches 'x86/prototypes', 'x86/x2apic' and 'x86/debug' into x86/core 2008-08-14 14:58:22 +02:00
mach-generic x86: make 32bit support per_cpu vector 2008-10-16 16:52:53 +02:00
mach-rdc321x removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
mach-voyager x86/voyager: fix compile breakage casued by x86: move prefill_possible_map calling early 2008-10-30 22:55:51 +01:00
math-emu x86: coding style fixes to arch/x86/math-emu/reg_constant 2008-06-18 15:00:13 +02:00
mm x86: fix /dev/mem mmap breakage when PAT is disabled 2008-10-30 23:54:41 +01:00
oprofile oprofile: fixing whitespaces in arch/x86/oprofile/* 2008-10-16 17:17:46 +02:00
pci x86/PCI: irq and pci_ids patch for Intel Ibex Peak DeviceIDs 2008-10-20 10:53:48 -07:00
power Merge branch 'x86/unify-cpu-detect' into x86-v28-for-linus-phase4-D 2008-10-11 20:23:20 +02:00
vdso Merge branches 'x86/urgent', 'x86/amd-iommu', 'x86/apic', 'x86/cleanups', 'x86/core', 'x86/cpu', 'x86/fixmap', 'x86/gart', 'x86/kprobes', 'x86/memtest', 'x86/modules', 'x86/nmi', 'x86/pat', 'x86/reboot', 'x86/setup', 'x86/step', 'x86/unify-pci', 'x86/uv', 'x86/xen' and 'xen-64bit' into x86/for-linus 2008-07-21 16:37:17 +02:00
video x86: video/fbdev.c: add MODULE_LICENSE 2008-05-04 20:04:46 +02:00
xen xen: fix Xen domU boot with batched mprotect 2008-10-27 14:11:20 +01:00
Kconfig Merge branch 'linus' into test 2008-10-23 00:11:07 -04:00
Kconfig.cpu x86, bts: improve help text for BTS config 2008-10-28 16:39:37 +01:00
Kconfig.debug x86: usb debug port early console, fix 2008-07-26 17:32:30 +02:00
Makefile x86, um: ... and asm-x86 move 2008-10-22 22:55:20 -07:00
Makefile_32.cpu x86: merge winchip-2 and winchip-2a cpu choices 2008-10-13 10:22:48 +02:00