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* powerpc/smp: smp_ops->kick_cpu() should be able to failMichael Ellerman2011-04-2012-23/+46
| | | | | | | | | | | | | When we start a cpu we use smp_ops->kick_cpu(), which currently returns void, it should be able to fail. Convert it to return int, and update all uses. Convert all the current error cases to return -ENOENT, which is what would eventually be returned by __cpu_up() currently when it doesn't detect the cpu as coming up in time. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/boot: Add an ePAPR compliant boot wrapperDavid Gibson2011-04-204-1/+79
| | | | | | | | | | | | | | | | | | | | This is a first cut at making bootwrapper code which will produce a zImage compliant with the requirements set down by ePAPR. This is a very simple bootwrapper, taking the device tree blob supplied by the ePAPR boot program and passing it on to the kernel. It builds on the earlier patch to build a relocatable ET_DYN zImage to meet the other ePAPR image requirements. For good measure we have some paranoid checks which will generate warnings if some of the ePAPR entry condition guarantees are not met. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/boot: Allow building the zImage wrapper as a relocatable ET_DYNMichael Ellerman2011-04-204-70/+118
| | | | | | | | | | | | | | | | | | | This patch adds code, linker script and makefile support to allow building the zImage wrapper around the kernel as a position independent executable. This results in an ET_DYN instead of an ET_EXEC ELF output file, which can be loaded at any location by the firmware and will process its own relocations to work correctly at the loaded address. This is of interest particularly since the standard ePAPR image format must be an ET_DYN (although this patch alone is not sufficient to produce a fully ePAPR compliant boot image). Note for now we don't enable building with -pie for anything. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/mm: Fix slice state initialization for Book3EMichael Ellerman2011-04-201-1/+1
| | | | | | | | | | | | | | On Book3E, MMU_NO_CONTEXT != 0, but the slice_mm_new_context() macro assumes that it is. This means that the map of the page sizes for each slice is always initialized to zeroes (which happens to be 4k pages), rather than to the correct default base page size value - which might be 64k. This patch corrects the problem. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/mm: Standardise on MMU_NO_CONTEXTMichael Ellerman2011-04-202-2/+3
| | | | | | | | Use MMU_NO_CONTEXT as the initialiser for mm_context.id on nohash and hash64. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Improve prom_printf()Benjamin Herrenschmidt2011-04-201-1/+25
| | | | | | | Adds the ability to print decimal numbers and adds some more format string variants Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Perform an isync to synchronize CPUs coming out of secondary_holdBenjamin Herrenschmidt2011-04-201-0/+2
| | | | | | | We need to do that to guarantee they see any code change done by dynamic patching during boot. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Add NAP mode support on Power7 in HV modeBenjamin Herrenschmidt2011-04-207-2/+139
| | | | | | | | | Wakeup comes from the system reset handler with a potential loss of the non-hypervisor CPU state. We save the non-volatile state on the stack and a pointer to it in the PACA, which the system reset handler uses to restore things Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Properly handshake CPUs going out of boot spin loopBenjamin Herrenschmidt2011-04-205-23/+37
| | | | | | | | We need to wait a bit for them to have done their CPU setup or we might end up with translation and EE on with different LPCR values between threads Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Call CPU ->restore callback earlier on secondary CPUsBenjamin Herrenschmidt2011-04-201-11/+11
| | | | | | | | | | | | | We do it before we loop on the PACA start flag. This way, we get a chance to set critical SPRs on all CPUs before Linux tries to start them up, which avoids problems when changing some bits such as LPCR bits that need to be identical on all threads of a core or similar things like that. Ideally, some of that should also be done before the MMU is enabled, but that's a separate issue which would require moving some of the SMP startup code earlier, let's not get there for now, it works with that change alone. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Initialize TLB and LPID register on HV mode Power7Benjamin Herrenschmidt2011-04-201-0/+18
| | | | | | In case entry from the bootloader isn't "clean" Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Initialize LPCR:DPFD on power7 to a sane defaultBenjamin Herrenschmidt2011-04-201-0/+7
| | | | | | | | This sets the default data stream prefetch size for operating systems that don't set their own value in DSCR. We use 4 which is "medium". Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Always use SPRN_SPRG_HSCRATCH0 when running in HV modePaul Mackerras2011-04-207-28/+41
| | | | | | | | | | | | This uses feature sections to arrange that we always use HSPRG1 as the scratch register in the interrupt entry code rather than SPRG2 when we're running in hypervisor mode on POWER7. This will ensure that we don't trash the guest's SPRG2 when we are running KVM guests. To simplify the code, we define GET_SCRATCH0() and SET_SCRATCH0() macros like the GET_PACA/SET_PACA macros. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: More work to support HV exceptionsBenjamin Herrenschmidt2011-04-203-42/+89
| | | | | | | Rework exception macros a bit to split offset from vector and add some basic support for HDEC, HDSI, HISI and a few more. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Base support for exceptions using HSRR0/1Benjamin Herrenschmidt2011-04-209-49/+86
| | | | | | | | | Pass the register type to the prolog, also provides alternate "HV" version of hardware interrupt (0x500) and adjust LPES accordingly We tag those interrupts by setting bit 0x2 in the trap number Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: In HV mode, use HSPRG0 for PACABenjamin Herrenschmidt2011-04-207-16/+50
| | | | | | | | | When running in Hypervisor mode (arch 2.06 or later), we store the PACA in HSPRG0 instead of SPRG1. The architecture specifies that SPRGs may be lost during a "nap" power management operation (though they aren't currently on POWER7) and this enables use of SPRG1 by KVM guests. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Define CPU feature for Architected 2.06 HV modeBenjamin Herrenschmidt2011-04-204-1/+74
| | | | | | | | | | This bit indicates that we are operating in hypervisor mode on a CPU compliant to architecture 2.06 or later (currently server only). We set it on POWER7 and have a boot-time CPU setup function that clears it if MSR:HV isn't set (booting under a hypervisor). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/xics: Make sure we have a sensible default distribution serverBenjamin Herrenschmidt2011-04-201-3/+9
| | | | | | | | | Even when nothing is specified in the device tree, and despite the fact that we don't setup links properly yet, we still need a reasonable value in there or some interrupts won't be setup properly to point to an existing processor. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Add more Power7 specific definitionsBenjamin Herrenschmidt2011-04-202-1/+46
| | | | | | | This adds more SPR definitions used on newer processors when running in hypervisor mode. Along with some other P7 specific bits and pieces Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/xics: Rewrite XICS driverBenjamin Herrenschmidt2011-04-2019-1017/+1377
| | | | | | | | | | | | | | | | This is a significant rework of the XICS driver, too significant to conveniently break it up into a series of smaller patches to be honest. The driver is moved to a more generic location to allow new platforms to use it, and is broken up into separate ICP and ICS "backends". For now we have the native and "hypervisor" ICP backends and one common RTAS ICS backend. The driver supports one ICP backend instanciation, and many ICS ones, in order to accomodate future platforms with multiple possibly different interrupt "sources" mechanisms. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/powermac: Build fix with SMP and CPU hotplugBenjamin Herrenschmidt2011-04-181-3/+5
| | | | Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/perf_event: Skip updating kernel counters if register value shrinksEric B Munson2011-04-181-7/+30
| | | | | | | | | | | | | | | Because of speculative event roll back, it is possible for some event coutners to decrease between reads on POWER7. This causes a problem with the way that counters are updated. Delta calues are calculated in a 64 bit value and the top 32 bits are masked. If the register value has decreased, this leaves us with a very large positive value added to the kernel counters. This patch protects against this by skipping the update if the delta would be negative. This can lead to a lack of precision in the coutner values, but from my testing the value is typcially fewer than 10 samples at a time. Signed-off-by: Eric B Munson <emunson@mgebm.net> Cc: stable@kernel.org Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Don't write protect kernel text with CONFIG_DYNAMIC_FTRACE enabledStefan Roese2011-04-181-1/+1
| | | | | | | | | | | | | This problem was noticed on an MPC855T platform. Ftrace did oops when trying to write to the kernel text segment. Many thanks to Joakim for finding the root cause of this problem. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Joakim Tjernlund <joakim.tjernlund@transmode.se> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Fix oops if scan_dispatch_log is called too earlyAnton Blanchard2011-04-181-0/+3
| | | | | | | | | | | | | | | | | | | | | | We currently enable interrupts before the dispatch log for the boot cpu is setup. If a timer interrupt comes in early enough we oops in scan_dispatch_log: Unable to handle kernel paging request for data at address 0x00000010 ... .scan_dispatch_log+0xb0/0x170 .account_system_vtime+0xa0/0x220 .irq_enter+0x88/0xc0 .do_IRQ+0x48/0x230 The patch below adds a check to scan_dispatch_log to ensure the dispatch log has been allocated. Signed-off-by: Anton Blanchard <anton@samba.org> Cc: <stable@kernel.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/pseries: Use a kmem cache for DTL buffersNishanth Aravamudan2011-04-181-2/+10
| | | | | | | | | | | PAPR specifies that DTL buffers can not cross AMS environments (aka CMO in the PAPR) and can not cross a memory entitlement granule boundary (4k). This is found in section 14.11.3.2 H_REGISTER_VPA of the PAPR. kmalloc does not guarantee an alignment of the allocation, though, beyond 8 bytes (at least in my understanding). Create a special kmem cache for DTL buffers with the alignment requirement. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/kexec: Fix regression causing compile failure on UPPaul Gortmaker2011-04-181-6/+6
| | | | | | | | | | | | | | | Recent commit b987812b3fcaf70fdf0037589e5d2f5f2453e6ce caused a compile failure on UP because a considerably large block of the file was included within CONFIG_SMP, hence making a stub function not exposed on UP builds when it needed to be. Relocate the stub to the #else /* ! CONFIG_SMP */ section and also annotate the relevant else/endif so that nobody else falls into the same trap I did. Reported-by: Michael Guntsche <mike@it-loops.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* Merge remote branch 'kumar/merge' into mergeBenjamin Herrenschmidt2011-04-185-7/+26
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| * powerpc/85xx: disable Suspend support if SMP enabledKumar Gala2011-04-121-1/+1
| | | | | | | | | | | | | | | | | | | | We currently dont have CPU Hotplug support working on 85xx so we need to disable Suspsend support as it will force enabling of CPU Hotplug. arch/powerpc/kernel/built-in.o: In function `cpu_die': arch/powerpc/kernel/smp.c:702: undefined reference to `start_secondary_resume' make: *** [.tmp_vmlinux1] Error 1 Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
| * powerpc/e500mc: Remove CPU_FTR_MAYBE_CAN_NAP/CPU_FTR_MAYBE_CAN_DOZEScott Wood2011-04-121-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | e500mc does not support the HID0/MSR mechanism that is used by e500_idle (and there are also issues with waking on certain types of interrupts). Further, even if napping is never actually enabled, just having CPU_FTR_CAN_NAP will cause machine_init() to overwrite the board's supplied ppc_md.power_save(). We drop CPU_FTR_MAYBE_CAN_DOZE becuase we should use 'wait' instead on e500mc. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
| * powerpc/book3e: Fix CPU feature handling on 64-bit e5500Kumar Gala2011-04-122-1/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | The CPU_FTRS_POSSIBLE and CPU_FTRS_ALWAYS defines did not encompass e5500 CPU features when built for 64-bit. This causes issues with cpu_has_feature() as it utilizes the POSSIBLE & ALWAYS defines as part of its check. Create a unique CPU_FTRS_E5500 (as its different from CPU_FTRS_E500MC), created a new group for 64-bit Book3e based CPUs and add CPU_FTRS_E5500 to that group. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
| * powerpc: Check device status before adding serial devicePrabhakar Kushwaha2011-04-121-3/+5
| | | | | | | | | | | | | | | | serial port nodes with the property status="disabled" are not usable and so avoid adding "disabled" port with the system. Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
| * powerpc/85xx: Don't add disabled PCIe devicesPrabhakar Kushwaha2011-04-121-0/+5
| | | | | | | | | | | | | | | | PCIe nodes with the property status="disabled" are not usable and so avoid adding "disabled" PCIe bridge with the system. Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
* | RapidIO/mpc85xx: fix possible mport registration problemsAlexandre Bounine2011-04-151-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix a possible problem with mport registration left non-cleared after fsl_rio_setup() exits on link error. Abort mport initialization if registration failed. This patch is applicable to 2.6.39-rc1 only. The problem does not exist for earlier versions. Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Li Yang <leoli@freescale.com> Cc: Thomas Moll <thomas.moll@sysgo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | PM / Hibernate: Introduce CONFIG_HIBERNATE_CALLBACKSRafael J. Wysocki2011-04-111-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Xen save/restore is going to use hibernate device callbacks for quiescing devices and putting them back to normal operations and it would need to select CONFIG_HIBERNATION for this purpose. However, that also would cause the hibernate interfaces for user space to be enabled, which might confuse user space, because the Xen kernels don't support hibernation. Moreover, it would be wasteful, as it would make the Xen kernels include a substantial amount of code that they would never use. To address this issue introduce new power management Kconfig option CONFIG_HIBERNATE_CALLBACKS, such that it will only select the code that is necessary for the hibernate device callbacks to work and make CONFIG_HIBERNATION select it. Then, Xen save/restore will be able to select CONFIG_HIBERNATE_CALLBACKS without dragging the entire hibernate code along with it. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Tested-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>
* | Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6Linus Torvalds2011-04-0764-94/+94
|\ \ | |/ |/| | | | | * 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6: Fix common misspellings
| * Fix common misspellingsLucas De Marchi2011-03-3164-94/+94
| | | | | | | | | | | | Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
* | powerpc/pseries: Fix build without CONFIG_HOTPLUG_CPUMatt Evans2011-04-051-6/+11
| | | | | | | | | | Signed-off-by: Matt Evans <matt@ozlabs.au.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc: Set nr_cpu_ids early and use it to free PACAsRyan Grimm2011-04-052-1/+4
| | | | | | | | | | | | | | Without this, "holes" in the CPU numbering can cause us to free too many PACAs Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/pseries: Don't register global initcallBenjamin Herrenschmidt2011-04-051-1/+1
| | | | | | | | Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/kexec: Fix mismatched ifdefs for PPC64/SMP.Paul Gortmaker2011-04-051-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit b3df895aebe091b1657 "powerpc/kexec: Add support for FSL-BookE" introduced the original PPC_STD_MMU_64 checks around the function crash_kexec_wait_realmode(). Then commit c2be05481f61252 "powerpc: Fix default_machine_crash_shutdown #ifdef botch" changed the ifdef around the calling site to add a check on SMP, but the ifdef around the function itself was left unchanged, leaving an unused function for PPC_STD_MMU_64=y and SMP=n Rather than have two ifdefs that can get out of sync like this, simply put the corrected conditional around the function and use a stub to get rid of one set of ifdefs completely. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | Merge remote branch 'kumar/merge' into mergeBenjamin Herrenschmidt2011-04-054-19/+19
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| * | powerpc/85xx: Update dts for PCIe memory maps to match u-boot of Px020RDBPrabhakar Kushwaha2011-04-044-19/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | PCIe memory address space is 1:1 mapped with u-boot. Update dts of Px020RDB i.e. P1020RDB and P2020RDB to match the address map changes in u-boot. Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
* | | Documentation: fix minor typos/spellingSylvestre Ledru2011-04-052-2/+2
|/ / | | | | | | | | | | | | | | | | | | | | Fix some minor typos: * informations => information * there own => their own * these => this Signed-off-by: Sylvestre Ledru <sylvestre.ledru@scilab.org> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | powerpc/pmac/smp: Remove no-longer needed preempt workaroundBenjamin Herrenschmidt2011-04-011-7/+0
| | | | | | | | | | | | | | The generic code properly re-initializes the preempt count in the idle thread now Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/smp: Increase vdso_data->processorCount, not just decrease itBenjamin Herrenschmidt2011-04-011-0/+4
| | | | | | | | Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/smp: Create idle threads on demand and properly reset themBenjamin Herrenschmidt2011-04-011-22/+78
| | | | | | | | | | | | | | | | | | Instead of creating idle threads at boot for all possible CPUs, we create them on demand, like x86 or ARM, and we properly call init_idle to re-initialize an idle thread when a CPU was unplugged and is now re-plugged. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/smp: Don't expose per-cpu "cpu_state" arrayBenjamin Herrenschmidt2011-04-013-6/+15
| | | | | | | | | | | | | | | | Instead, keep it static, expose an accessor and use that from the PowerMac code. Avoids easy namespace collisions and will make it easier to consolidate with other implementations. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/pmac/smp: Fix CPU hotplug crashes on some machinesBenjamin Herrenschmidt2011-04-011-16/+55
| | | | | | | | | | | | | | | | | | | | | | | | | | On some machines that use i2c to synchronize the timebases (such as PowerMac7,2/7,3 G5 machines), hotplug CPU would crash when putting back a new CPU online due to the underlying i2c bus being closed. This uses the newly added bringup_done() callback to move the close along with other housekeeping calls, and adds a CPU notifier to re-open the i2c bus around subsequent hotplug operations Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/smp: Add a smp_ops->bringup_up() done callbackBenjamin Herrenschmidt2011-04-012-0/+5
| | | | | | | | | | | | | | | | This allows us to stop abusing smp_ops->setup_cpu() for cleanup tasks that have to take place after the initial boot time CPU bringup. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/pmac/smp: Properly NAP offlined CPU on G5Benjamin Herrenschmidt2011-04-014-28/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The current code soft-disables, and then goes to NAP mode which turns interrupts on. That means that if an interrupt occurs, we will hit the masked interrupt code path which isn't what we want, as it will return with EE off, which will either get us out of NAP mode, or fail to enter it (according to spec). Instead, let's just rely on the fact that it is safe to take decrementer interrupts on an offline CPU and leave interrupts enabled. We can also get rid of the special case in asm for power4_cpu_offline_powersave() and just use power4_idle(). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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