aboutsummaryrefslogtreecommitdiff
path: root/arch
AgeCommit message (Collapse)Author
2007-09-24[MIPS] SMTC: Make ack_bad_irq() safe with no IM backstop.Ralf Baechle
Issue reported and original patch by Kevin Kissel, cleaner (imho) implementation by me. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-09-21Merge master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
* master.kernel.org:/home/rmk/linux-2.6-arm: [ARM] 4569/1: ep93xx_gpio_irq_type(): fix spurious enumeration offset for FGPIO handling [ARM] 4568/1: fix l2x0 cache invalidate handling of unaligned addresses
2007-09-21Revert "x86_64: Quicklist support for x86_64"Linus Torvalds
This reverts commit 34feb2c83beb3bdf13535a36770f7e50b47ef299. Suresh Siddha points out that this one breaks the fundamental requirement that you cannot free page table pages before the TLB caches are flushed. The quicklists do not give the same kinds of guarantees that the mmu_gather structure does, at least not in NUMA configurations. Requested-by: Suresh Siddha <suresh.b.siddha@intel.com> Acked-by: Andi Kleen <ak@suse.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Christoph Lameter <clameter@sgi.com> Cc: Asit Mallick <asit.k.mallick@intel.com> Cc: Tony Luck <tony.luck@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-21Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linusLinus Torvalds
* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus: [MIPS] BCM1480: include <linux/init.h>. [MIPS] BCM1480: Export zbbus_mhz.
2007-09-21[MIPS] BCM1480: include <linux/init.h>.Ralf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-09-21[MIPS] BCM1480: Export zbbus_mhz.Ralf Baechle
Symbol is required by the ZBus profiler. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-09-21x86_64: Zero extend all registers after ptrace in 32bit entry path.Andi Kleen
Strictly it's only needed for eax. It actually does a little more than strictly needed -- the other registers are already zero extended. Also remove the now unnecessary and non functional compat task check in ptrace. This is CVE-2007-4573 Found by Wojciech Purczynski Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-20[x86 setup] Fix typo in arch/i386/boot/header.SPaul Bolle
There's an obvious typo in arch/i386/boot/header.S (in your linux-2.6-x86setup.git) that I noticed by just studying the code. Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2007-09-20[acpi] Correct the decoding of video mode numbers in wakeup.SH. Peter Anvin
wakeup.S looks at the video mode number from the setup header and looks to see if it is a VESA mode. Unfortunately, the decoding is done incorrectly and it will attempt to frob the VESA BIOS for any mode number 0x0200 or larger. Correct this, and remove a bunch of #if 0'd code. Massive thanks to Jeff Chua for reporting the bug, and suffering though a large number of experiments in order to track this problem down. Cc: Pavel Machek <pavel@ucw.cz> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2007-09-20[x86 setup] Present the canonical video mode number to the kernelH. Peter Anvin
Canonicalize the video mode number as presented to the kernel. The video mode number may be user-entered (e.g. ASK_VGA), an alias (e.g. NORMAL_VGA), or a size specification, and that confuses the suspend wakeup code. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2007-09-20[ARM] 4569/1: ep93xx_gpio_irq_type(): fix spurious enumeration offset for ↵Herbert Valerio Riedel
FGPIO handling The EP93XX_GPIO_LINE_F() macro is supposed to be called with a line number between 0 and 7, but the current code causes it to get called with an spuriously offset number range {16..23}. Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org> Signed-off-by: Lennert Buytenhek <kernel@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-09-19Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linusLinus Torvalds
* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus: [MIPS] cpu-bugs64.c: GCC 3.3 constraint workaround [MIPS] DEC: Initialise ioasic_ssr_lock
2007-09-19Merge branch 'merge' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: [POWERPC] Fix timekeeping on PowerPC 601 [POWERPC] Don't expose clock vDSO functions when CPU has no timebase [POWERPC] spusched: Fix null pointer dereference in find_victim
2007-09-19x86-64: page faults from user mode are always user faultsLinus Torvalds
Randy Dunlap noticed an interesting "crashme" behaviour on his dual Prescott Xeon setup, where he gets page faults with the error code having a zero "user" bit, but the register state points back to user mode. This may be a CPU microcode buglet triggered by some strange instruction pattern that crashme generates, and loading a microcode update seems to possibly have fixed it. Regardless, we really should trust the register state more than the error code, since it's really the register state that determines whether we can actually send a signal, or whether we're in kernel mode and need to oops/kill the process in the case of a page fault. Cc: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-19[MIPS] cpu-bugs64.c: GCC 3.3 constraint workaroundMaciej W. Rozycki
Add a workaround to address warnings generated on the "n" constraint by GCC 3.3 and below. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-09-19[MIPS] DEC: Initialise ioasic_ssr_lockMaciej W. Rozycki
Fix the definition of the ioasic_ssr_lock spinlock to include a proper initialisation. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-09-19uml: fix irqstack crashJeff Dike
This patch fixes a crash caused by an interrupt coming in when an IRQ stack is being torn down. When this happens, handle_signal will loop, setting up the IRQ stack again because the tearing down had finished, and handling whatever signals had come in. However, to_irq_stack returns a mask of pending signals to be handled, plus bit zero is set if the IRQ stack was already active, and thus shouldn't be torn down. This causes a problem because when handle_signal goes around the loop, sig will be zero, and to_irq_stack will duly set bit zero in the returned mask, faking handle_signal into believing that it shouldn't tear down the IRQ stack and return thread_info pointers back to their original values. This will eventually cause a crash, as the IRQ stack thread_info will continue pointing to the original task_struct and an interrupt will look into it after it has been freed. The fix is to stop passing a signal number into to_irq_stack. Rather, the pending signals mask is initialized beforehand with the bit for sig already set. References to sig in to_irq_stack can be replaced with references to the mask. [akpm@linux-foundation.org: use UL] Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-19xen: don't bother trying to set cr4Jeremy Fitzhardinge
Xen ignores all updates to cr4, and some versions will kill the domain if you try to change its value. Just ignore all changes. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-19uml: use correct type in BLKGETSIZE ioctlNicolas George
I found a type mismatch in UML that makes host block devices unusable as ubd devices on x86_64 and other 64 bits systems (segfault of the mm subsystem): In block/ioctl.c, the following lines show that the BLKGETSIZE ioctl expects a pointer to a long: case BLKGETSIZE: if ((bdev->bd_inode->i_size >> 9) > ~0UL) return -EFBIG; return put_ulong(arg, bdev->bd_inode->i_size >> 9); In arch/um/os-Linux/file.c, os_file_size calls it with an int. The ioctl_list man page should be fixed as well. Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-19[POWERPC] Fix timekeeping on PowerPC 601Benjamin Herrenschmidt
Recent changes to the timekeeping code broke support for the PowerPC 601 processor which doesn't have the usual timebase facility but a slightly different thing called (yuck) the RTC. This fixes it, boot tested on an old 601 based PowerMac 7200. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-09-19[POWERPC] Don't expose clock vDSO functions when CPU has no timebaseBenjamin Herrenschmidt
We forgot to remove the clock_gettime, clock_getres and get_tbfreq vDSO calls on CPUs that have no timebase such as 601 or 403 (old CPUs that have different mechanisms and for which the vDSO code will not work properly). This fixes it. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-09-19[POWERPC] spusched: Fix null pointer dereference in find_victimChristoph Hellwig
find_victim can dereference a NULL pointer when iterating over the list of victim spus because list_mutex only guarantees spu->ct to be stable, but of course not to be non-NULL. Also fix find_victim to not call spu_unbind_context without list_mutex because that violates the above guarantee. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-09-17[ARM] 4568/1: fix l2x0 cache invalidate handling of unaligned addressesRui Sousa
The l2x0_inv_range() function doesn't handle unaligned addresses correctly. It's necessary to clean the cache lines that are at the start and end of the invalidate range, if the addresses are not aligned, to prevent corruption of other data sharing the same cache line. Signed-off-by: Rui Sousa <rui.p.m.sousa@gmail.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-09-16[SPARC64]: Warn user if cpu is ignored.David S. Miller
When NR_CPUS is smaller than the cpu probed, let the user know that the cpu won't be used. Suggested by Al Viro. Signed-off-by: David S. Miller <davem@davemloft.net>
2007-09-16[SPARC64]: Fix lockdep, particularly on SMP.David S. Miller
As noted by Al Viro, when we try to call prom_set_trap_table() in the SMP trampoline code we try to take the PROM call spinlock which doesn't work because the current thread pointer isn't valid yet and lockdep depends upon that being correct. Furthermore, we cannot set the current thread pointer register because it can't be properly dereferenced until we return from prom_set_trap_table(). Kernel TLB misses only work after that call. So do the PROM call to set the trap table directly instead of going through the OBP library C code, and thus avoid the lock altogether. These calls are guarenteed to be serialized fully. Since there are now no calls to the prom_set_trap_table{_sun4v}() library functions, they can be deleted. Signed-off-by: David S. Miller <davem@davemloft.net>
2007-09-16[SPARC64]: Update defconfig.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-09-14Merge git://git.linux-xtensa.org/kernel/xtensa-feedLinus Torvalds
* git://git.linux-xtensa.org/kernel/xtensa-feed: [patch 1/2] Xtensa: enable arbitary tty speed setting ioctls [patch 2/2] xtensa console.c: remove duplicate #include [XTENSA] Add support for cache-aliasing [XTENSA] Add kernel module support [XTENSA] Add support for executable/non-executable feature in the mmu [XTENSA] Use the generic version of get_order [XTENSA] Initialize semaphore_wake_lock [XTENSA] Add typecast macro for constants [XTENSA] Fix timer instabilities. [XTENSA] Fix fadvise64_64 [XTENSA] Remove extraneous include statement [XTENSA] Move string-io functions to io.c from pci.c [XTENSA] Move pre-initialized structures to init_task.c [XTENSA] Add freestanding option to CFLAGS [XTENSA] Add getpgrp system-call to unistd.h [XTENSA] add missing system calls [XTENSA] fix wrong usage of __init and __initdata in traps.c
2007-09-14Merge branch 'for-linus' of ↵Linus Torvalds
master.kernel.org:/pub/scm/linux/kernel/git/cooloney/blackfin-2.6 * 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/cooloney/blackfin-2.6: Blackfin arch: fix some bugs in lib/string.h functions found by our string testing modules Blackfin arch: fix the aliased write macros Blackfin arch: Update/Fix PM support add new pm_ops valid
2007-09-14Merge master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
* master.kernel.org:/home/rmk/linux-2.6-arm: [ARM] 4567/1: Fix 'Oops - undefined instruction' when CONFIG_VFP=y on non VFP device [ARM] realview: disable second GIC on RevB MPCore platforms
2007-09-14[MIPS] 20Kc: Disable use of WAIT instruction.Ralf Baechle
Another issue with 20Kc's WAIT, waiting for more details. With the 2.6.23 release immindent simply disable the use of WAIT instead of a more fancy workaround. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-09-14[MIPS] Workaround for 4Kc machine check exceptionMaciej W. Rozycki
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-09-14[MIPS] Malta: Fix off by one bug in interrupt handler.Ralf Baechle
Fairly cosmetic as it would only affect VSMP / SMTC kernels that don't use vectored interrupts. Found by Beth. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-09-14[MIPS] Add #include <linux/profile.h> to arch/mips/kernel/time.cYoichi Yuasa
It refer to CPU_PROFILING. arch/mips/kernel/time.c: In function 'local_timer_interrupt': arch/mips/kernel/time.c:142: error: implicit declaration of function 'profile_tick' arch/mips/kernel/time.c:142: error: 'CPU_PROFILING' undeclared (first use in this function) arch/mips/kernel/time.c:142: error: (Each undeclared identifier is reported only once arch/mips/kernel/time.c:142: error: for each function it appears in.) Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-09-14[MIPS] N32 needs to use compat_sys_futimesatJohannes Dickgreber
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-09-14[MIPS] rtlx: Fix build error.Ralf Baechle
CC arch/mips/kernel/rtlx.o cc1: warnings being treated as errors arch/mips/kernel/rtlx.c:59: warning: 'irq' defined but not used arch/mips/kernel/rtlx.c:60: warning: 'irq_num' defined but not used Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-09-14[MIPS] rtlx: fix int vs. long bug.Ralf Baechle
CC arch/mips/kernel/rtlx.o arch/mips/kernel/rtlx.c: In function 'rtlx_init': arch/mips/kernel/rtlx.c:114: warning: format '%x' expects type 'unsigned int', but argument 3 has type 'long unsigned int' Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-09-13[ARM] 4567/1: Fix 'Oops - undefined instruction' when CONFIG_VFP=y on non ↵Tzachi Perelstein
VFP device vfp_init() takes care of the condition when CONFIG_VFP=y but no real VFP device exists. However, when this condition is true, a compiler might misplace code lines in a way that will break this support. (To be more specific - fmrx(FPSID) might be executed before vfp_testing_entry assignment, which will end up with Oops - undefined instruction). This patch adds a barrier() to guarantee the right execution ordering. Signed-off-by: Assaf Hoffman Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-09-13[ARM] realview: disable second GIC on RevB MPCore platformsRussell King
The second GIC asserts a permanent interrupt on Rev.B MPCore platforms. Disable initialisation of this GIC to avoid unbootable systems. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-09-12Merge branch 'merge' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: [POWERPC] Move serial_dev_init to device_initcall() [POWERPC] Enable GENERIC_ISA_DMA if FSL_ULI1575 to fix compile issue [POWERPC] cpm2: Fix off-by-one error in setbrg(). [PPC] 8xx: Fix r3 trashing due to 8MB TLB page instantiation [POWERPC] 8{5,6}xx: Fix build issue with !CONFIG_PCI
2007-09-13[POWERPC] Move serial_dev_init to device_initcall()Olof Johansson
With the I/O space rewrite by BenH, the legacy_serial serial_dev_init() initcall is now called before I/O space is setup, but it's dependent on it being available. Since there's no way to make dependencies between initcalls, we'll just have to move it to device_initcall(). Yes, it's suboptimal but I'm not aware of any better solution at this time, and it fixes a regression from 2.6.22. Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-09-12i386: Fix leak of ../kernel from top levelAndi Kleen
Fix a compile error when the directory above the kernel source contains a file named "kernel". Originally from Ben LaHaise, modified based on feedback from Sam Ravnborg Signed-off-by: Andi Kleen <ak@suse.de> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Ben LaHaise <bcrl@kvack.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-12x86_64: Prevent doing anything from cache_remove_dev() when info setup failed.Andi Kleen
AK: Removed the unlikelies because gcc heuristics default to unlikely AK: for test == NULL and for negative returns. Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: Ashok Raj <ashok.raj@intel.com> Cc: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-12x86_64: Add missing mask operation to vdsoAndi Kleen
vdso vgetns() didn't mask the time source offset calculation, which could lead to time problems with 32bit HPET. Add the masking. Thanks to Chuck Ebbert for tracking this down. Signed-off-by: Andi Kleen <ak@suse.de> Cc: Chuck Ebbert <cebbert@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-12[POWERPC] Enable GENERIC_ISA_DMA if FSL_ULI1575 to fix compile issueKumar Gala
Since the ULI1575 has a ISA bus we need to enable the generic ISA dma support for drivers that might expect it. Without this we get compile errors like the following: ound/built-in.o: In function `claim_dma_lock': /home/galak/git/linux-8572/include/asm/dma.h:189: undefined reference to `dma_spin_lock' /home/galak/git/linux-8572/include/asm/dma.h:189: undefined reference to `dma_spin_lock' sound/built-in.o: In function `release_dma_lock': /home/galak/git/linux-8572/include/asm/dma.h:195: undefined reference to `dma_spin_lock' sound/built-in.o: In function `claim_dma_lock': /home/galak/git/linux-8572/include/asm/dma.h:189: undefined reference to `dma_spin_lock' /home/galak/git/linux-8572/include/asm/dma.h:189: undefined reference to `dma_spin_lock' sound/built-in.o:/home/galak/git/linux-8572/include/asm/dma.h:195: more undefined references to `dma_spin_lock' follow make: *** [.tmp_vmlinux1] Error 1 Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2007-09-12[SPARC64]: Fix booting on V100 systems.David S. Miller
On the root PCI bus, the OBP device tree lists device 3 twice. Once as 'pm' and once as 'lomp'. Everything goes downhill from there. Ignore the second instance to workaround this. Thanks to Kövedi_Krisztián for the bug report and testing the fix. Signed-off-by: David S. Miller <davem@davemloft.net>
2007-09-11revert "highmem: catch illegal nesting"Andrew Morton
Revert commit 656dad312fb41ed95ef08325e9df9bece3aacbbb Author: Ingo Molnar <mingo@elte.hu> Date: Sat Feb 10 01:46:36 2007 -0800 [PATCH] highmem: catch illegal nesting Catch illegally nested kmap_atomic()s even if the page that is mapped by the 'inner' instance is from lowmem. This avoids spuriously zapped kmap-atomic ptes and turns hard to find crashes into clear asserts at the bug site. Problem is, a get_zeroed_page(GFP_KERNEL) from interrupt context will trigger this check if non-irq code on this CPU holds a KM_USER0 mapping. But that get_zeroed_page() will never be altering the kmap slot anyway due to the GFP_KERNEL. Cc: Christoph Lameter <clameter@sgi.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-11m68k(nommu): add missing syscallsGeert Uytterhoeven
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-11H8/300: Fix misnamed "CONFIG_BLKDEV_RESERVE_ADDRESS" Kconfig variableRobert P. J. Day
Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Acked-by: Satyam Sharma <satyam@infradead.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-11Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linusLinus Torvalds
* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus: [MIPS] Fix aliasing bug in copy_user_highpage. [MIPS] IP22: fix wrong argument order [MIPS] IP22: Fix wrong check for second HPC [MIPS] Ocelot: remove remaining bits [MIPS] TLB: Fix instruction bitmasks [MIPS] R10000: Fix wrong test in dma-default.c [MIPS] Provide empty irq_enable_hazard definition for legacy and R1 cores. [MIPS] Sibyte: Remove broken dependency on EXPERIMENTAL from SIBYTE_SB1xxx_SOC. [MIPS] Kconfig: whitespace cleanup. [MIPS] PCI: Set need_domain_info if controller domain index is non-zero. [MIPS] BCM1480: Fix computation of interrupt mask address register. [MIPS] i8259: Add disable method. [MIPS] tty: add the new ioctls and definitions.
2007-09-11[MIPS] Fix aliasing bug in copy_user_highpage.Ralf Baechle
Copy_user_highpage was written assuming it was only being called for breaking COW pages in which case the source page isn't cached as in marked cachable under it kernel virtual address. If it is called anyway the aliasing avoidance strategy implemented by kmap_coherent will fail. Avoid the use of kmap_coherent for pages marked dirty and to avoid another instance of this sort of bug, place a BUG_ON in kmap_coherent. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>