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* [ARM] mm 8: define mem_types table L1 bit 4 to be for ARMv6Russell King2007-05-05
| | | | | | | Change the memory types table to define the L1 descriptor bit 4 to be in terms of the ARMv6 definition - execute never. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] mm 6: allow mem_types table to specify extended pte attributesRussell King2007-04-21
| | | | | | | | Add prot_pte_ext to the mem_types table to allow the extended pte attributes to be passed to set_pte_ext(), thereby permitting us to specify memory type information for the hardware PTE entries. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] mm 5: Use mem_types table in ioremapRussell King2007-04-21
| | | | | | | We really want to be using the memory type table in ioremap, so we only have to do the CPU type fixups in one place. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] mm 4: make create_mapping() more conventionalRussell King2007-04-21
| | | | | | | | | Rather than our three separate loops to setup mappings (by page mappings up to a section boundary, then section mappings, and the remainder by page mappings) convert this to a more conventional Linux style of a loop over each page table level. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] mm 3: separate out supersection mappings, avoid for <4GBRussell King2007-04-21
| | | | | | | | | | | | | | | | | | | | Catalin Marinas at ARM Ltd says: > The CPU architects in ARM intended supersections only as a way to map > addresses >= 4GB. Supersections are not mandated by the architecture > and there is no easy way to detect their hardware support at run-time > (other than checking for a specific core). From the analysis done in > ARM, there wasn't a clear performance gain by using supersections > rather than sections (no significant improvement in the TLB misses). Therefore, we should avoid using supersections unless there's a real need (iow, we're mapping addresses >= 4GB). This means that we can simplify create_mapping() a bit since we will only use supersection mappings for addresses >= 4GB, which means that the physical, virtual and length must be multiples of the supersection mapping size. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] mm 2: clean up create_mapping()Russell King2007-04-21
| | | | | | | | There's now no need to carry around each protection separately. Instead, pass around the pointer to the entry in the mem_types array which we're interested in. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] mm 1: Combine mem_type domain into prot_* at init timeRussell King2007-04-21
| | | | | | | | | | | Rather than combining the domain for a particular memory type with the protection information each time we want to use it, do so when we fix up the mem_type array at initialisation time. Rename struct mem_types to be mem_type - each structure is one memory type description, not several. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] getuser.S and putuser.S don't need thread_info.h nor asm-offsets.hRussell King2007-04-21
| | | | Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] ptrace: clean up single stepping supportRussell King2007-04-21
| | | | Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] Remove needless linux/ptrace.h includesRussell King2007-04-21
| | | | | | | | | Lots of places in arch/arm were needlessly including linux/ptrace.h, resumably because we used to pass a struct pt_regs to interrupt handlers. Now that we don't, all these ptrace.h includes are redundant. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] EBSA110: Add readsw/readsl/writesw/writeslRussell King2007-04-21
| | | | Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] Add ability to dump exception stacks to kernel backtracesRussell King2007-04-21
| | | | Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6Linus Torvalds2007-04-17
|\ | | | | | | | | | | | | | | | | | | | | * master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6: [BRIDGE]: Unaligned access when comparing ethernet addresses [SCTP]: Unmap v4mapped addresses during SCTP_BINDX_REM_ADDR operation. [SCTP]: Fix assertion (!atomic_read(&sk->sk_rmem_alloc)) failed message [NET]: Set a separate lockdep class for neighbour table's proxy_queue [NET]: Fix UDP checksum issue in net poll mode. [KEY]: Fix conversion between IPSEC_MODE_xxx and XFRM_MODE_xxx. [NET]: Get rid of alloc_skb_from_cache
| * [NET]: Get rid of alloc_skb_from_cacheHerbert Xu2007-04-17
| | | | | | | | | | | | | | | | | | Since this was added originally for Xen, and Xen has recently (~2.6.18) stopped using this function, we can safely get rid of it. Good timing too since this function has started to bit rot. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6Linus Torvalds2007-04-17
|\ \ | | | | | | | | | | | | | | | * 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6: [PATCH] x86: Fix potential overflow in perfctr reservation [PATCH] x86: Fix gcc 4.2 _proxy_pda workaround
| * | [PATCH] x86: Fix potential overflow in perfctr reservationAndi Kleen2007-04-16
| | | | | | | | | | | | | | | | | | | | | | | | While reviewing this code again I found a potential overflow of the bitmap. The p4 oprofile can theoretically set bits beyond the reservation bitmap for specific configurations. Avoid that by sizing the bitmaps properly. Signed-off-by: Andi Kleen <ak@suse.de>
| * | [PATCH] x86: Fix gcc 4.2 _proxy_pda workaroundAndi Kleen2007-04-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Due to an over aggressive optimizer gcc 4.2 cannot optimize away _proxy_pda in all cases (counter intuitive, but true). This breaks loading of some modules. The earlier workaround to just export a dummy symbol didn't work unfortunately because the module code ignores exports with 0 value. Make it 1 instead. Signed-off-by: Andi Kleen <ak@suse.de>
* | | alpha: build fixes - force architectureIvan Kokshaysky2007-04-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | Override compiler .arch directive for generic kernel build. Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Signed-off-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | alpha: more fixes for specific machine typesIvan Kokshaysky2007-04-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | arch/alpha/kernel/sys_sx164.c Earlier firmware revisions need MVI fix as well. arch/alpha/kernel/sys_nautilus.c On UP1500 firmware reports wrong AGP IRQ (10 instead of 5). This causes interrupt storm if there is a PCI device that uses IRQ 5. Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | alpha: fixes for specific machine typesIvan Kokshaysky2007-04-17
| |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Files: arch/alpha/kernel/core_mcpcia.c arch/alpha/kernel/sys_rawhide.c include/asm-alpha/core_mcpcia.h Determine correct hose configuration; RAWHIDE family can have 2 or 4 hoses, so make sure non-existent hoses are ignored. arch/alpha/kernel/err_titan.c Supply a needed #include <asm/irq_regs.h> arch/alpha/kernel/module.c Add some useful output to the relocation overflow messages. arch/alpha/kernel/sys_noritake.c Supply necessary noritake_end_irq() to correct interrupt handling. This fixes a problem first noted by hangs during boot probing with a DE500-BA TULIP NIC present. arch/alpha/kernel/sys_sio.c Correct saving of original PIRQ register (PCI IRQ routing); change default PIRQ setting to leave PCI IRQs 9 and 14 free to be used for sound (Multia) and IDE (any), respectively. include/asm-alpha/io.h Supply the "isa_virt_to_bus" routine. Signed-off-by: Jay Estabrook <jay.estabrook@hp.com> Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | cache_k8_northbridges() overflows beyond allocationBadari Pulavarty2007-04-16
| | | | | | | | | | | | | | | | | | cache_k8_northbridges() is storing config values to incorrect locations (in flush_words) and also its overflowing beyond the allocation, causing slab verification failures. Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Merge master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds2007-04-16
|\ \ | |/ |/| | | | | | | * master.kernel.org:/home/rmk/linux-2.6-arm: [ARM] 4313/1: S3C24XX: Update s3c2410 defconfig to 2.6.21-rc6 [ARM] Update mach-types
| * [ARM] 4313/1: S3C24XX: Update s3c2410 defconfig to 2.6.21-rc6Ben Dooks2007-04-16
| | | | | | | | | | | | | | | | Update defconfig to the latest kernel version and enable the h1940 LED driver Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * [ARM] Update mach-typesRussell King2007-04-16
| | | | | | | | Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* | Fix VMI relocation processing logic errorZachary Amsden2007-04-15
| | | | | | | | | | | | | | | | | | | | | | | | | | Fix logic error in VMI relocation processing. NOPs would always cause a BUG_ON to fire because the != RELOCATION_NONE in the first if clause precluding the == VMI_RELOCATION_NOP in the second clause. Make these direct equality tests and just warn for unsupported relocation types (which should never happen), falling back to native in that case. Thanks to Anthony Liguori for noting this! Signed-off-by: Zachary Amsden <zach@vmware.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | failsafe mechanism to HPET clock calibrationRavikiran G Thirumalai2007-04-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Provide a failsafe mechanism to avoid kernel spinning forever at read_hpet_tsc during early kernel bootup. This failsafe mechanism was originally introduced in commit 2f7a2a79c3ebb44f8b1b7d9b4fd3a650eb69e544, but looks like the hpet split from time.c lost it again. This reintroduces the failsafe mechanism Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org> Signed-off-by: Shai Fultheim <shai@scalex86.org> Cc: Jack Steiner <steiner@sgi.com> Cc: john stultz <johnstul@us.ibm.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6Linus Torvalds2007-04-13
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | * master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6: [SPARC64]: Fix inline directive in pci_iommu.c [SPARC64]: Fix arg passing to compat_sys_ipc(). [SPARC]: Fix section mismatch warnings in pci.c and pcic.c [SUNRPC]: Make sure on-stack cmsg buffer is properly aligned. [SPARC]: avoid CHILD_MAX and OPEN_MAX constants [SPARC64]: Fix SBUS IOMMU allocation code.
| * | [SPARC64]: Fix inline directive in pci_iommu.cTom "spot" Callaway2007-04-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | While building a test kernel for the new esp driver (against git-current), I hit this bug. Trivial fix, put the inline declaration in the right place. :) Signed-off-by: Tom "spot" Callaway <tcallawa@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | [SPARC64]: Fix arg passing to compat_sys_ipc().David S. Miller2007-04-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | Do not sign extend args using the sys32_ipc stub, that is buggy and unnecessary. Based upon an excellent report by Mikael Pettersson. Signed-off-by: David S. Miller <davem@davemloft.net>
| * | [SPARC]: Fix section mismatch warnings in pci.c and pcic.cRobert Reif2007-04-12
| | | | | | | | | | | | | | | | | | | | | | | | Fix section mismatch in arch/sparc/kernel/pcic.c and arch/sparc64/kernel/pci.c. Signed-off-by: Robert Reif <reif@earthlink.net> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | [SPARC]: avoid CHILD_MAX and OPEN_MAX constantsRoland McGrath2007-04-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I don't figure anyone really cares about SunOS syscall emulation, and I certainly don't. But I'm getting rid of uses of the OPEN_MAX and CHILD_MAX compile-time constant, and these are almost the only ones. OPEN_MAX is a bogus constant with no meaning about anything. The RLIMIT_NOFILE resource limit is what sysconf (_SC_OPEN_MAX) actually wants to return. The CHILD_MAX cases weren't actually using anything I want to get rid of, but I noticed that they are there and are wrong too. The CHILD_MAX value is not really unlimited as a -1 return from sysconf indicates. The RLIMIT_NPROC resource limit is what sysconf (_SC_CHILD_MAX) wants to return. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | [SPARC64]: Fix SBUS IOMMU allocation code.David S. Miller2007-04-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are several IOMMU allocator bugs. Instead of trying to fix this overly complicated code, just mirror the PCI IOMMU arena allocator which is very stable and well stress tested. I tried to make the code as identical as possible so we can switch sun4u PCI and SBUS over to a common piece of IOMMU code. All that will be need are two callbacks, one to do a full IOMMU flush and one to do a streaming buffer flush. This patch gets rid of a lot of hangs and mysterious crashes on SBUS sparc64 systems, at least for me. Signed-off-by: David S. Miller <davem@davemloft.net>
* | | [PPC] Fix compilation and linking errors of mpc86xads build.Vitaly Bordug2007-04-12
| | | | | | | | | | | | | | | | | | | | | Fix compilation of mpc866ads_setup.c Signed-off-by: Vitaly Bordug <vbordug@ru.mvista.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
* | | [PPC] Fix compilation and linking errors of mpc885ads build.Vitaly Bordug2007-04-12
| | | | | | | | | | | | | | | | | | | | | Fix compilation of mpc885ads_setup.c Signed-off-by: Vitaly Bordug <vbordug@ru.mvista.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
* | | [PPC] MPC8272 ADS compile fixed, defconfig refreshed.Vitaly Bordug2007-04-12
|/ / | | | | | | | | | | | | Fix compilation of mpc8272ads_setup.c Signed-off-by: Vitaly Bordug <vbordug@ru.mvista.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
* | [POWERPC] mpc52xx_pic: fix main interrupt maskingDomen Puncer2007-04-11
| | | | | | | | | | | | | | | | | | The bit setting was off by one. Tested with RTC and GPIO_WKUP interrupts. Signed-off-by: Domen Puncer <domen.puncer@telargo.com> Signed-off-by: Sylvain Munaut <tnt@246tNt.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* | Merge branch 'release' of ↵Linus Torvalds2007-04-10
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6: [IA64] SGI Altix : fix pcibr_dmamap_ate32() bug [IA64] Fix CPU freq displayed in /proc/cpuinfo [IA64] Fix wrong assumption about irq and vector in msi_ia64.c [IA64] BTE error timer fix
| * | [IA64] SGI Altix : fix pcibr_dmamap_ate32() bugMike Habeck2007-04-06
| | | | | | | | | | | | | | | | | | | | | | | | On a SGI Altix TIOCP based PCI bus we need to include the ATE_PIO attribute bit if we're mapping a 32bit MSI address. Signed-off-by: Mike Habeck <habeck@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
| * | [IA64] Fix CPU freq displayed in /proc/cpuinfoVenki Pallipadi2007-04-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | My patch: git commit=95235ca2c20ac0b31a8eb39e2d599bcc3e9c9a10 introduced a bug in IA64 cpuinfo output. Patch changed the proc_freq from 1HZ resolution to 1KHz resolution, but left format string unchanged at " %lu.%06lu". Below is the fix. Thanks to Bjorn for catching this. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
| * | [IA64] Fix wrong assumption about irq and vector in msi_ia64.cIshimatsu Yasuaki2007-04-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixes a wrong assumption in ia64 MSI code that IRQ equals vector. Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
| * | [IA64] BTE error timer fixRuss Anderson2007-04-06
| |/ | | | | | | | | | | | | The bte recovery_timer was not being set correctly. Signed-off-by: Russ Anderson <rja@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
* | [PATCH] i386: irqbalance_disable() section fixAndrew Morton2007-04-08
| | | | | | | | | | | | | | | | WARNING: arch/i386/kernel/built-in.o - Section mismatch: reference to .init.text:irqbalance_disable from .text between 'quirk_intel_irqbalance' (at offset 0x80a5) and 'i8237A_suspend' Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | [PATCH] x86_64 early quirks: fix early_qrk[] section tagAndrew Morton2007-04-08
| | | | | | | | | | | | | | | | | | | | | | | | | | WARNING: arch/x86_64/kernel/built-in.o - Section mismatch: reference to .init.text:nvidia_bugs from .data between 'early_qrk' (at offset 0x8428) and 'enable_cpu_hotplug' WARNING: arch/x86_64/kernel/built-in.o - Section mismatch: reference to .init.text:via_bugs from .data between 'early_qrk' (at offset 0x8438) and 'enable_cpu_hotplug' WARNING: arch/x86_64/kernel/built-in.o - Section mismatch: reference to .init.text:ati_bugs from .data between 'early_qrk' (at offset 0x8448) and 'enable_cpu_hotplug' The compiler is putting it into .data because the __initdata is in the wrong place. Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | [PATCH] Proper fix for highmem kmap_atomic functions for VMI for 2.6.21Zachary Amsden2007-04-08
|/ | | | | | | | | | | | | | | | | | | | Since lazy MMU batching mode still allows interrupts to enter, it is possible for interrupt handlers to try to use kmap_atomic, which fails when lazy mode is active, since the PTE update to highmem will be delayed. The best workaround is to issue an explicit flush in kmap_atomic_functions case; this is the only way nested PTE updates can happen in the interrupt handler. Thanks to Jeremy Fitzhardinge for noting the bug and suggestions on a fix. This patch gets reverted again when we start 2.6.22 and the bug gets fixed differently. Signed-off-by: Zachary Amsden <zach@vmware.com> Cc: Andi Kleen <ak@muc.de> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6Linus Torvalds2007-04-02
|\ | | | | | | | | | | | | | | * 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6: [PATCH] x86: Don't probe for DDC on VBE1.2 [PATCH] x86-64: Increase NMI watchdog probing timeout [PATCH] x86-64: Let oprofile reserve MSR on all CPUs [PATCH] x86-64: Disable local APIC timer use on AMD systems with C1E
| * [PATCH] x86: Don't probe for DDC on VBE1.2Zwane Mwaikambo2007-04-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | VBE1.2 doesn't support function 15h (DDC) resulting in a 'hang' whilst uncompressing kernel with some video cards. Make sure we check VBE version before fiddling around with DDC. http://bugzilla.kernel.org/show_bug.cgi?id=1458 Opened: 2003-10-30 09:12 Last update: 2007-02-13 22:03 Much thanks to Tobias Hain for help in testing and investigating the bug. Tested on; i386, Chips & Technologies 65548 VESA VBE 1.2 CONFIG_VIDEO_SELECT=Y CONFIG_FIRMWARE_EDID=Y Untested on x86_64. Signed-off-by: Zwane Mwaikambo <zwane@infradead.org> Signed-off-by: Andi Kleen <ak@suse.de>
| * [PATCH] x86-64: Increase NMI watchdog probing timeoutAndi Kleen2007-04-02
| | | | | | | | | | | | A 4 core Opteron needs longer than 10 ticks for this. Signed-off-by: Andi Kleen <ak@suse.de>
| * [PATCH] x86-64: Let oprofile reserve MSR on all CPUsAndi Kleen2007-04-02
| | | | | | | | | | | | | | | | | | | | The MSR reservation is per CPU and oprofile would only allocate them on the CPU it was initialized on. Change this to handle all CPUs. This also fixes a warning about unprotected use of smp_processor_id() in preemptible kernels. Signed-off-by: Andi Kleen <ak@suse.de>
| * [PATCH] x86-64: Disable local APIC timer use on AMD systems with C1EAndi Kleen2007-04-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | AMD dual core laptops with C1E do not run the APIC timer correctly when they go idle. Previously the code assumed this only happened on C2 or deeper. But not all of these systems report support C2. Use a AMD supplied snippet to detect C1E being enabled and then disable local apic timer use. This supercedes an earlier workaround using DMI detection of specific systems. Thanks to Mark Langsdorf for the detection snippet. Signed-off-by: Andi Kleen <ak@suse.de>
* | [PATCH] i386: fix file_read_actor() and pipe_read() for original i386 systemsThomas Gleixner2007-04-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The __copy_to_user_inatomic() calls in file_read_actor() and pipe_read() are broken on original i386 machines, where WP-works-ok == false, as __copy_to_user_inatomic() on such systems calls functions which might sleep and/or contain cond_resched() calls inside of a kmap_atomic() region. The original check for WP-works-ok was in access_ok(), but got moved during the 2.5 series to fix a race vs. swap. Return the number of bytes to copy in the case where we are in an atomic region, so the non atomic code pathes in file_read_actor() and pipe_read() are taken. This could be optimized to avoid the kmap_atomicby moving the check for WP-works-ok into fault_in_pages_writeable(), but this is more intrusive and can be done later. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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