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* [PATCH] update legacy io handling for pmacOlaf Hering2006-10-011-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | ppc can boot one single binary on prep, chrp and pmac boards. ppc64 can boot one single binary on pseries and G5 boards. pmac has no legacy io, probing for PC style legacy hardware (or accessing the legacy io area regulary) may lead to a hard crash: * add check for parport_pc, exit on pmac. 32bit chrp has no ->check_legacy_ioport, the probe is always called. 64bit chrp has check_legacy_ioport, check for a "parallel" node * add check for isapnp, only PReP boards may have real ISA slots. 32bit PReP will have no ->check_legacy_ioport, the probe is always called. * update code in i8042_platform_init. Run ->check_legacy_ioport first, always call request_region. No functional change. Remove whitespace before i8042_reset init. Signed-off-by: Olaf Hering <olaf@aepfle.de> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Adam Belay <ambx1@neo.rr.com> Cc: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] mmc (mainly): add "or later" clause to licence statement.Pierre Ossman2006-10-011-0/+5
| | | | | | | | | | | | Clarify my (Pierre's) position on which GPL versions apply. The patch only touches the source files where I am the only major author. The people who have made the minor commits to the files have been contacted and have no issues with this change. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] remove SYSRQ_KEY and related defines from ppc/sh/h8300Olaf Hering2006-10-013-13/+0
| | | | | | | | | | | | | | Remove unused global SYSRQ_KEY from ppc and powerpc Remove unused define SYSRQ_KEY from sh/sh64 and h8300 Remove unused pckbd_sysrq_xlate and kbd_sysrq_xlate usage Signed-off-by: Olaf Hering <olaf@aepfle.de> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Directed yield: direct yield of spinlocks for s390.Martin Schwidefsky2006-10-013-23/+61
| | | | | | | | | | | Use the new diagnose 0x9c in the spinlock implementation for s390. It yields the remaining timeslice of the virtual cpu that tries to acquire a lock to the virtual cpu that is the current holder of the lock. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proper flags type of spin_lock_irqsave()Alexey Dobriyan2006-10-017-14/+15
| | | | | | | | | | | | Convert various spin_lock_irqsave() callers to correctly use `unsigned long'. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp> Cc: "Luck, Tony" <tony.luck@intel.com> Acked-by: Kyle McMartin <kyle@mcmartin.ca> Cc: Jean Delvare <khali@linux-fr.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] kmemdup: some usersAlexey Dobriyan2006-10-011-3/+2
| | | | | Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] arch/i386/pci/mmconfig.c tweaksAndrew Morton2006-10-011-1/+4
| | | | | | | | | | | - Add soothing comment - uninline thrice-called function Cc: OGAWA Hirofumi <hogawa@miraclelinux.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] hot-add-mem x86_64: use CONFIG_MEMORY_HOTPLUG_RESERVEKeith Mannthey2006-10-011-4/+13
| | | | | | | | | | | | | The api for hot-add memory already has a construct for finding nodes based on an address, memory_add_physaddr_to_nid. This patch allows the fucntion to do something besides return 0. It uses the nodes_add infomation to lookup to node info for a hot add event. Signed-off-by: Keith Mannthey <kmannth@us.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] hot-add-mem x86_64: memory_add_physaddr_to_nid node fixupKeith Mannthey2006-10-013-0/+21
| | | | | | | | | | | | | | | | | | | In cases where the acpi memory-add event does not containe the pxm (node) infomation allow the driver to look up node info based on the address. The acpi_get_node call returns -1 if it can't decode the pxm info, this causes add_memory to panic. acpi_get_node would have to decode the resource from the handle (a lenghty proposition). This seems to be the cleanist point to interject the hook. [kamezawa.hiroyu@jp.fujitsu.com: build fixes] [y-goto@jp.fujitsu.com: build fixes] Signed-off-by: Keith Mannthey <kmannth@us.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] hot-add-mem x86_64: memory_add_physaddr_to_nid enableKeith Mannthey2006-10-012-14/+19
| | | | | | | | | | | | | The api for hot-add memory already has a construct for finding nodes based on an address, memory_add_physaddr_to_nid. This patch allows the fucntion to do something besides return 0. It uses the nodes_add infomation to lookup to node info for a hot add event. Signed-off-by: Keith Mannthey <kmannth@us.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] hot-add-mem x86_64: Enable SPARSEMEM in srat.cKeith Mannthey2006-10-011-22/+29
| | | | | | | | | | | | Enable x86_64 srat.c to share code between both reserve and sparsemem based add memory paths. Both paths need the hot-add area node locality infomration (nodes_add). This code refactors the code path to allow this. Signed-off-by: Keith Mannthey <kmannth@us.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] hot-add-mem x86_64: Kconfig changesKeith Mannthey2006-10-011-0/+4
| | | | | | | | | | | | | | Create Kconfig namespace for MEMORY_HOTPLUG_RESERVE and MEMORY_HOTPLUG_SPARSE. This is needed to create a disticiton between the 2 paths. Selecting the high level opiton of MEMORY_HOTPLUG will get you MEMORY_HOTPLUG_SPARSE if you have sparsemem enabled or MEMORY_HOTPLUG_RESERVE if you are x86_64 with discontig and ACPI numa support. Signed-off-by: Keith Mannthey <kmannth@us.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] BLOCK: Move extern declarations out of fs/*.c into header files [try #6]David Howells2006-09-301-2/+2
| | | | | | | | | | | Create a new header file, fs/internal.h, for common definitions local to the sources in the fs/ directory. Move extern definitions that should be in header files from fs/*.c to fs/internal.h or other main header files where they span directories. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
* [PATCH] Remove ->rq_status from struct requestJens Axboe2006-09-301-2/+0
| | | | | | | | | | | After Christophs SCSI change, the only usage left is RQ_ACTIVE and RQ_INACTIVE. The block layer sets RQ_INACTIVE right before freeing the request, so any check for RQ_INACTIVE in a driver is a bug and indicates use-after-free. So kill/clean the remaining users, straight forward. Signed-off-by: Jens Axboe <axboe@suse.de>
* Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6Linus Torvalds2006-09-3011-86/+111
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6: [PATCH] Use early clobber in semaphores [PATCH] Define vsyscall cache as blob to make clearer that user space shouldn't use it [PATCH] Re-positioning the bss segment [PATCH] Use ARRAY_SIZE in setup.c [PATCH] i386: replace intermediate array-size definitions with ARRAY_SIZE() [PATCH] x86: Clean up x86 NMI sysctls [PATCH] Refactor some duplicated code in mpparse.c [PATCH] Document iommu=panic [PATCH] Fix broken indentation in iommu_setup [PATCH] Allow disabling DAC using command line options [PATCH] Add proper sparse __user casts to __copy_to_user_inatomic [PATCH] i386: Update defconfig [PATCH] Update defconfig
| * [PATCH] Define vsyscall cache as blob to make clearer that user space ↵Andi Kleen2006-09-301-4/+4
| | | | | | | | | | | | shouldn't use it Signed-off-by: Andi Kleen <ak@suse.de>
| * [PATCH] Re-positioning the bss segmentVivek Goyal2006-09-301-7/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | [AK: This apparently broke some systems, but we need it to fix a compile problem with old binutils and in theory the patch is correct. So let's trying reenabling it again.] o Currently bss segment is being placed somewhere in the middle (after .data) section and after bss lots of init section and data sections are coming. Is it intentional? o One side affect of placing bss in the middle is that objcopy keeps the bss in raw binary image (vmlinux.bin) hence unnecessarily increasing the size of raw binary image. (In my case ~600K). It also increases the size of generated bzImage, though the increase is very small (896 bytes), probably a very high compression ratio for stream of zeros. o This patch moves the bss at the end hence reducing the size of bzImage by 896 bytes and size of vmlinux.bin by 600K. o This change benefits in the context of relocatable kernel patches. If kernel bss is not part of compressed data (vmlinux.bin) then it does not have to be decompressed and this area can be used by the decompressor for its execution hence keeping the memory requirements bounded and decompressor code does not stomp over any other data loaded beyond kernel image (As might be the case with bootloaders like kexec). Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andi Kleen <ak@suse.de>
| * [PATCH] Use ARRAY_SIZE in setup.cAndi Kleen2006-09-301-8/+3
| | | | | | | | | | | | Based on i386 patch from Bjorn. Signed-off-by: Andi Kleen <ak@suse.de>
| * [PATCH] i386: replace intermediate array-size definitions with ARRAY_SIZE()Bjorn Helgaas2006-09-301-8/+2
| | | | | | | | | | | | | | | | Code is easier to validate if array sizes aren't hidden behind extra #defines. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Andi Kleen <ak@suse.de>
| * [PATCH] x86: Clean up x86 NMI sysctlsAndi Kleen2006-09-303-0/+9
| | | | | | | | | | | | | | | | | | Use prototypes in headers Don't define panic_on_unrecovered_nmi for all architectures Cc: dzickus@redhat.com Signed-off-by: Andi Kleen <ak@suse.de>
| * [PATCH] Refactor some duplicated code in mpparse.cAndi Kleen2006-09-301-18/+19
| | | | | | | | | | | | No logic changes Signed-off-by: Andi Kleen <ak@suse.de>
| * [PATCH] Document iommu=panicAndi Kleen2006-09-301-0/+1
| | | | | | | | Signed-off-by: Andi Kleen <ak@suse.de>
| * [PATCH] Fix broken indentation in iommu_setupAndi Kleen2006-09-301-41/+41
| | | | | | | | | | | | No functional changes; only white space. Signed-off-by: Andi Kleen <ak@suse.de>
| * [PATCH] Allow disabling DAC using command line optionsAndi Kleen2006-09-301-0/+18
| | | | | | | | | | | | Might or might not work around some reported bugs on VIA systems. Signed-off-by: Andi Kleen <ak@suse.de>
| * [PATCH] i386: Update defconfigAndi Kleen2006-09-301-2/+5
| | | | | | | | Signed-off-by: Andi Kleen <ak@suse.de>
| * [PATCH] Update defconfigAndi Kleen2006-09-301-2/+6
| | | | | | | | Signed-off-by: Andi Kleen <ak@suse.de>
* | [SPARC]: Don't zero out tail during copy_from_user_inatomic().David S. Miller2006-09-301-0/+4
|/ | | | | | | | Actually, since we use the same code for all the copying types in and out of userspace, we check at runtime whether preemption is disabled. Signed-off-by: David S. Miller <davem@davemloft.net>
* [PATCH] uml build fixOllie Wild2006-09-301-1/+1
| | | | | | Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] solaris emulation: incorrect tty lockingAlan Cox2006-09-291-0/+3
| | | | | | | | | [akpm@osdl.org: build fix] [akpm@osdl.org: warning fix] Signed-off-by: Alan Cox <alan@redhat.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] simplify update_times (avoid jiffies/jiffies_64 aliasing problem)Atsushi Nemoto2006-09-2931-41/+40
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pass ticks to do_timer() and update_times(), and adjust x86_64 and s390 timer interrupt handler with this change. Currently update_times() calculates ticks by "jiffies - wall_jiffies", but callers of do_timer() should know how many ticks to update. Passing ticks get rid of this redundant calculation. Also there are another redundancy pointed out by Martin Schwidefsky. This cleanup make a barrier added by 5aee405c662ca644980c184774277fc6d0769a84 needless. So this patch removes it. As a bonus, this cleanup make wall_jiffies can be removed easily, since now wall_jiffies is always synced with jiffies. (This patch does not really remove wall_jiffies. It would be another cleanup patch) Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: john stultz <johnstul@us.ibm.com> Cc: Andi Kleen <ak@muc.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Acked-by: Russell King <rmk@arm.linux.org.uk> Cc: Ian Molton <spyro@f2s.com> Cc: Mikael Starvik <starvik@axis.com> Acked-by: David Howells <dhowells@redhat.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Hirokazu Takata <takata.hirokazu@renesas.com> Acked-by: Ralf Baechle <ralf@linux-mips.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Cc: Richard Curnow <rc@rc0.org.uk> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp> Cc: Chris Zankel <chris@zankel.net> Acked-by: "Luck, Tony" <tony.luck@intel.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] pidspace: is_init()Sukadev Bhattiprolu2006-09-2919-22/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is an updated version of Eric Biederman's is_init() patch. (http://lkml.org/lkml/2006/2/6/280). It applies cleanly to 2.6.18-rc3 and replaces a few more instances of ->pid == 1 with is_init(). Further, is_init() checks pid and thus removes dependency on Eric's other patches for now. Eric's original description: There are a lot of places in the kernel where we test for init because we give it special properties. Most significantly init must not die. This results in code all over the kernel test ->pid == 1. Introduce is_init to capture this case. With multiple pid spaces for all of the cases affected we are looking for only the first process on the system, not some other process that has pid == 1. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Dave Hansen <haveblue@us.ibm.com> Cc: Serge Hallyn <serue@us.ibm.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Cc: <lxc-devel@lists.sourceforge.net> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Fix conflict with the is_init identifier on pariscEric Biederman2006-09-291-16/+16
| | | | | | | | | | | | | | | | | | This appears to be the only usage of is_init in the kernel besides the usage in sched.h. On ia64 the same function is called in_init. So to remove the conflict and make the kernel more consistent rename is_init is_core is_local and is_local_section to in_init in_core in_local and in_local_section respectively. Thanks to Adrian Bunk who spotted this, and to Matthew Wilcox who suggested this fix. Signed-off-by: Eric Biederman <ebiederm@xmission.com> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Matthew Wilcox <willy@debian.org> Cc: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] kthread: convert arch/i386/kernel/apm.cSerge E. Hallyn2006-09-291-18/+18
| | | | | | | | | Convert i386 apm.c from kernel_thread(), whose export is deprecated, to kthread API. Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] oprofile: ppro: need to enable/disable all the countersArun Sharma2006-09-291-7/+13
| | | | | | | | | | | | | Need to enable/disable all the counters instead of just counter 0. This affects all cpus with family=6, including i386/core. Usual symptom: only counter 0 provides samples. Other counters don't produce samples. Signed-off-by: Arun Sharma <arun.sharma@google.com> Cc: Philippe Elie <phil.el@wanadoo.fr> Cc: John Levon <levon@movementarian.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Move valid_dma_direction() from x86_64 to generic codeRolf Eike Beer2006-09-291-1/+2
| | | | | | | | | | | As suggested by Muli Ben-Yehuda this function is moved to generic code as may be useful for all archs. [akpm@osdl.org: fix] Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de> Cc: Muli Ben-Yehuda <muli@il.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] efi: add lock annotations for efi_call_phys_prelog and ↵Josh Triplett2006-09-291-2/+2
| | | | | | | | | | | | | | | | efi_call_phys_epilog The functions efi_call_phys_prelog and efi_call_phys_epilog in arch/i386/kernel/efi.c wrap the spinlock efi_rt_lock: efi_call_phys_prelog returns with the lock held, and efi_call_phys_epilog releases the lock without acquiring it. Add lock annotations to these two functions so that sparse can check callers for lock pairing, and so that sparse will not complain about these functions since they intentionally use locks in this manner. Signed-off-by: Josh Triplett <josh@freedesktop.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] OMAP: Update OMAP1/2 boards to give keymapsize and other pdataKomal Shah2006-09-298-23/+41
| | | | | | | | | | | This patch adds keymapsize, delay and debounce flag in the keypad platform data for various TI OMAP1/2 based boards like F-sample, H2, H3, Innovator, Nokia770, OSK, Perseus and H4. Signed-off-by: Komal Shah <komal_shah802003@yahoo.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] make PROT_WRITE imply PROT_READJason Baron2006-09-299-10/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make PROT_WRITE imply PROT_READ for a number of architectures which don't support write only in hardware. While looking at this, I noticed that some architectures which do not support write only mappings already take the exact same approach. For example, in arch/alpha/mm/fault.c: " if (cause < 0) { if (!(vma->vm_flags & VM_EXEC)) goto bad_area; } else if (!cause) { /* Allow reads even for write-only mappings */ if (!(vma->vm_flags & (VM_READ | VM_WRITE))) goto bad_area; } else { if (!(vma->vm_flags & VM_WRITE)) goto bad_area; } " Thus, this patch brings other architectures which do not support write only mappings in-line and consistent with the rest. I've verified the patch on ia64, x86_64 and x86. Additional discussion: Several architectures, including x86, can not support write-only mappings. The pte for x86 reserves a single bit for protection and its two states are read only or read/write. Thus, write only is not supported in h/w. Currently, if i 'mmap' a page write-only, the first read attempt on that page creates a page fault and will SEGV. That check is enforced in arch/blah/mm/fault.c. However, if i first write that page it will fault in and the pte will be set to read/write. Thus, any subsequent reads to the page will succeed. It is this inconsistency in behavior that this patch is attempting to address. Furthermore, if the page is swapped out, and then brought back the first read will also cause a SEGV. Thus, any arbitrary read on a page can potentially result in a SEGV. According to the SuSv3 spec, "if the application requests only PROT_WRITE, the implementation may also allow read access." Also as mentioned, some archtectures, such as alpha, shown above already take the approach that i am suggesting. The counter-argument to this raised by Arjan, is that the kernel is enforcing the write only mapping the best it can given the h/w limitations. This is true, however Alan Cox, and myself would argue that the inconsitency in behavior, that is applications can sometimes work/sometimes fails is highly undesireable. If you read through the thread, i think people, came to an agreement on the last patch i posted, as nobody has objected to it... Signed-off-by: Jason Baron <jbaron@redhat.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Hugh Dickins <hugh@veritas.com> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Andi Kleen <ak@muc.de> Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Arjan van de Ven <arjan@linux.intel.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Cc: Ian Molton <spyro@f2s.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] uml: remove pte_mkexecJeff Dike2006-09-291-2/+4
| | | | | | | | | | | | Andi is making pte_mkexec go away, and UML had one of the last uses. This removes the use and the definition. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] uml: don't roll my own random MAC generatorJeff Dike2006-09-293-34/+1
| | | | | | | | | Use the existing random_ether_addr() instead of cooking up my own version. Pointed out by Dave Hollis and Jason Lunz. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] uml: remove unneeded fileJeff Dike2006-09-291-484/+0
| | | | | | | | | | Remove arch/um/kernel/skas/process_kern.c again. The stack alignment change which resulted in this file being here is safely in arch/um/kernel/process.c. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] uml: stack consumption reductionJeff Dike2006-09-292-5/+14
| | | | | | | | Fix some stack abuse in the sysrq t path. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] uml: close file descriptor leaksJeff Dike2006-09-292-8/+7
| | | | | | | | | | Close two file descriptor leaks, one in the ubd driver and one to /proc/mounts. The ubd driver bug also leaked some vmalloc space. The /proc/mounts leak was a descriptor that was just never closed. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] uml: locking documentationJeff Dike2006-09-295-2/+14
| | | | | | | | | | | | Some locking documentation and a cleanup. uml_exitcode is copied into a local before sprintf sees it, in case sprintf does anything non-atomic with it. The rest are comments about why certain globals don't need any kind of locking. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] uml: mechanical tidying after random MACs changeJeff Dike2006-09-293-80/+40
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Mechanical, hopefully non-functional changes stemming from setup_etheraddr always succeeding now that it always assigns a MAC, either from the command line or generated randomly: the test of the return of setup_etheraddr is removed, and code dependent on it succeeding is now unconditional setup_etheraddr can now be made void struct uml_net.have_mac is now always 1, so tests of it can be similarly removed, and uses of it can be replaced with 1 struct uml_net.have_mac is no longer used, so it can be removed struct uml_net_private.have_mac is copied from struct uml_net, so it is always 1 tests of uml_net_private.have_mac can be removed uml_net_private.have_mac can now be removed the only call to dev_ip_addr was removed, so it can be deleted It also turns out that setup_etheraddr is called only once, from the same file, so it can be static and its declaration removed from net_kern.h. Similarly, set_ether_mac is defined and called only from one file. Finally, setup_etheraddr and set_ether_mac were moved to avoid needing forward declarations. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] uml: assign random MACs to interfaces if necessaryJeff Dike2006-09-293-18/+46
| | | | | | | | | | | | | | | | | | | | | | Assign a random MAC to an ethernet interface if one was not provided on the command line. This became pressing when distros started bringing interfaces up before assigning IPs to them. The previous pattern of assigning an IP then bringing it up allowed the MAC to be generated from the first IP assigned. However, once the thing is up, it's probably a bad idea to change the MAC, so the MAC stayed initialized to fe:fd:0:0:0:0. Now, if there is no MAC from the command line, one is generated. We use the microseconds from gettimeofday (20 bits), plus the low 12 bits of the pid to seed the random number generator. random() is called twice, with 16 bits of each result used. I didn't want to have to try to fill in 32 bits optimally given an arbitrary RAND_MAX, so I just assume that it is greater than 65536 and use 16 bits of each random() return. There is also a bit of reformatting and whitespace cleanup here. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] convert i386 Summit subarch to use SRAT info for apicid_to_node callskeith mannthey2006-09-292-1/+11
| | | | | | | | | | | | | | | | | | | | | | | | | Convert the i386 summit subarch apicid_to_node to use node information provided by the SRAT. It was discussed a little on LKML a few weeks ago and was seen as an acceptable fix. The current way of obtaining the nodeid static inline int apicid_to_node(int logical_apicid) { return logical_apicid >> 5; } is just not correct for all summit systems/bios. Assuming the apicid matches the Linux node number require a leap of faith that the bios mapped out the apicids a set way. Modern summit HW (IBM x460) does not layout its bios in the manner for various reasons and is unable to boot i386 numa. The best way to get the correct apicid to node information is from the SRAT table during boot. It lays out what apicid belongs to what node. I use this information to create a table for use at run time. Signed-off-by: Keith Mannthey <kmannth@us.ibm.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] convert s390 page handling macros to functionsHeiko Carstens2006-09-291-1/+1
| | | | | | | | | | | | Convert s390 page handling macros to functions. In particular this fixes a problem with s390's SetPageUptodate macro which uses its input parameter twice which again can cause subtle bugs. [akpm@osdl.org: build fix] Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [IPV4]: annotate struct in_ifaddrAl Viro2006-09-293-4/+4
| | | | | | | | | ifa_local, ifa_address, ifa_mask, ifa_broadcast and ifa_anycast are net-endian. Annotated them and variables that are inferred to be net-endian. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds2006-09-28174-7941/+9075
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (130 commits) [ARM] 3856/1: Add clocksource for Intel IXP4xx platforms [ARM] 3855/1: Add generic time support [ARM] 3873/1: S3C24XX: Add irq_chip names [ARM] 3872/1: S3C24XX: Apply consistant tabbing to irq_chips [ARM] 3871/1: S3C24XX: Fix ordering of EINT4..23 [ARM] nommu: confirms the CR_V bit in nommu mode [ARM] nommu: abort handler fixup for !CPU_CP15_MMU cores. [ARM] 3870/1: AT91: Start removing static memory mappings [ARM] 3869/1: AT91: NAND support for DK and KB9202 boards [ARM] 3868/1: AT91 hardware header update [ARM] 3867/1: AT91 GPIO update [ARM] 3866/1: AT91 clock update [ARM] 3865/1: AT91RM9200 header updates [ARM] 3862/2: S3C2410 - add basic power management support for AML M5900 series [ARM] kthread: switch arch/arm/kernel/apm.c [ARM] Off-by-one in arch/arm/common/icst* [ARM] 3864/1: Refactore sharpsl_pm [ARM] 3863/1: Add Locomo SPI Device [ARM] 3847/2: Convert LOMOMO to use struct device for GPIOs [ARM] Use CPU_CACHE_* where possible in asm/cacheflush.h ...
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