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* Remove the uncached-control page code.Christopher Kenna2012-12-04
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* Update memory protection flags. Comment-out some debug messages.Christopher Kenna2012-12-03
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* Added IPI measurements to arm.Jonathan Herman2012-10-30
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* Turn color_ctrl_page into a system call.Christopher Kenna2012-10-18
| | | | | | | | Conflicts: include/litmus/color.h Signed-off-by: Christopher Kenna <cjk@cs.unc.edu>
* ARM: 7447/1: rwlocks: remove unused branch labels from trylock routinesWill Deacon2012-10-17
| | | | | | | | | | | | | The ARM arch_{read,write}_trylock implementations include unused backwards branch labels, since we don't retry the locking operation if the exclusive store fails. This patch removes the labels. Acked-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Christopher Kenna <cjk@cs.unc.edu>
* ARM: 7446/1: spinlock: use ticket algorithm for ARMv6+ locking implementationWill Deacon2012-10-17
| | | | | | | | | | | | | | | | | | | Ticket spinlocks ensure locking fairness by introducing a FIFO-like nature to the granting of lock acquisitions and also reducing the thundering herd effect when spinning on a lock by allowing the cacheline to remain in a shared state amongst the waiting CPUs. This is especially important on systems where memory-access times are not necessarily uniform when accessing the lock structure (for example, on a multi-cluster platform where the lock is allocated into L1 when a CPU releases it). This patch implements the ticket spinlock algorithm for ARM, replacing the simpler implementation for ARMv6+ processors. Reviewed-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Christopher Kenna <cjk@cs.unc.edu>
* Changes to ARM lockdown and LITMUS cycle counting code.Christopher Kenna2012-10-17
| | | | | | | | | | Try and fix the cycle counter on ARMv7 CPUs (unsuccessful). Use the multi-core timer on the ODROID-X to count cycles. Add lockdown register access to proc. Add proc options to disable prefetching for L1/L2 cache. Add test to lockdown.c to print the time to read in various WSSs. Signed-off-by: Christopher Kenna <cjk@cs.unc.edu>
* Fix cycle counters for ARM v7 CPUs.Christopher Kenna2012-10-12
| | | | | | | | Conflicts: arch/arm/mach-omap2/board-omap4panda.c Signed-off-by: Christopher Kenna <cjk@cs.unc.edu>
* Basic lockdown functions like a page prefetching under lock method.Christopher Kenna2012-10-12
| | | | | | | | Conflicts: arch/arm/mm/cache-l2x0.c Signed-off-by: Christopher Kenna <cjk@cs.unc.edu>
* Fix variable name in cache-l2x0.cChristopher Kenna2012-10-11
| | | | Signed-off-by: Christopher Kenna <cjk@cs.unc.edu>
* ARM: 7080/1: l2x0: make sure I&D are not locked down on initLinus Walleij2012-10-11
| | | | | | | | | | | | | | | | | | | | Fighting unfixed U-Boots and other beasts that may the cache in a locked-down state when starting the kernel, we make sure to disable all cache lock-down when initializing the l2x0 so we are in a known state. Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com> Cc: Rabin Vincent <rabin.vincent@stericsson.com> Cc: Adrian Bunk <adrian.bunk@movial.com> Cc: Rob Herring <robherring2@gmail.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reported-by: Jan Rinze <janrinze@gmail.com> Tested-by: Robert Marklund <robert.marklund@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Christopher Kenna <cjk@cs.unc.edu>
* uncachable color control pageChristopher Kenna2012-10-11
| | | | Signed-off-by: Christopher Kenna <cjk@cs.unc.edu>
* ARM: Fix bad merge bd1274dc005 (Merge branch 'v6v7' into devel)Russell King2012-10-11
| | | | | | | | | | | | | Commit 774c096bf9e49 (ARM: v6/v7 cache: allow cache calls to be optimized) got dropped when the merge conflicts for moving the contents of the files in commit 753790e713d (ARM: move cache/processor/fault glue to separate include files) was fixed up in merge bd1274dc005 (Merge branch 'v6v7' into devel). This puts the change back. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Christopher Kenna <cjk@cs.unc.edu>
* Architecture dependent uncachable control page.Christopher Kenna2012-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | While working on an ODROID-X (Samsung Exynos4412 ARM Cortex-A9), I experienced non-determinism when reading and writing values to the LITMUS^RT control page. Writes to the control page from user- (kernel-) space where not always reflected in kernel- (user-) space. Neither restricting the task to run on a single CPU nor inserting general memory barriers (with mb()) fixed the problem. Mapping the control page as uncachable in both kernel and user space did fix the problem, which is what this patch does. Also, since vunmap() cannot be called from an interrupt context, I had to add a workqueue that unmaps and frees the control page when it is no longer needed. (On my system, exit_litmus() was called from interrupt context while the kernel reaped the task_struct.) Conflicts: include/litmus/rt_param.h litmus/litmus.c Does not make the color control page uncachable yet! Signed-off-by: Christopher Kenna <cjk@cs.unc.edu>
* Coloring on the ARM.Christopher Kenna2012-10-05
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* Fix compilation of the perf tool.Christopher Kenna2012-10-02
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* Fixed sched_color run issues.Jonathan Herman2012-09-30
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| * Update to improved x86 Feather-Trace triggersBjoern Brandenburg2012-06-26
| | | | | | | | | | | | | | | | | | | | This patch imports recent upstream changes in Feather-Trace that reduce register pressure around Feather-Trace triggers. References: Commits 00713b8 and 225d734 in Feather-Trace. https://github.com/brandenburg/feather-trace/commit/00713b878636867ce07291c588509b38fa5bf152 https://github.com/brandenburg/feather-trace/commit/225d7348a08682cd87f72b127142bdfd6c0c7890
* | Merge branch 'wip-color' into wip-mcJonathan Herman2012-09-29
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: include/litmus/budget.h include/litmus/litmus.h include/litmus/rt_param.h include/litmus/sched_trace.h include/litmus/trace.h include/trace/events/litmus.h litmus/Makefile litmus/budget.c litmus/ftdev.c litmus/jobs.c litmus/litmus.c litmus/locking.c litmus/preempt.c litmus/rt_domain.c litmus/sched_gsn_edf.c litmus/trace.c
| * | Move nr_colors into color_cache_info and extern it for everyone.Christopher Kenna2012-05-04
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| * | Ticket spinlocks for flare based on Bjoern's old code.Christopher Kenna2012-05-03
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| * | Syscalls workingJonathan Herman2012-05-03
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| * | Add the beginings of a SPARC port. Edit page-types to work on SPARCChristopher Kenna2012-05-01
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| * | First commit.Christopher Kenna2012-03-26
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| * Update PULL_TIMERS_VECTOR numberAndrea Bastoni2011-08-27
| | | | | | | | | | | | From 2.6.39 the "0xee" vector number that we used for pull_timers low-level management is is use by invalidate_tlb_X interrupts. Move the pull_timers vector below the max size of invalidate_tlb.
| * Fix prototype mismatching and synch syscall numbersAndrea Bastoni2011-08-27
| | | | | | | | | | | | * Update prototypes for switched_to(), prio_changed(), select_task_rq(). * Fix missing pid field in printk output. * Synchronize syscall numbers for arm and x86.
| * Merge 'Linux v3.0' into LitmusAndrea Bastoni2011-08-27
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some notes: * Litmus^RT scheduling class is the topmost scheduling class (above stop_sched_class). * scheduler_ipi() function (e.g., in smp_reschedule_interrupt()) may increase IPI latencies. * Added path into schedule() to quickly re-evaluate scheduling decision without becoming preemptive again. This used to be a standard path before the removal of BKL. Conflicts: Makefile arch/arm/kernel/calls.S arch/arm/kernel/smp.c arch/x86/include/asm/unistd_32.h arch/x86/kernel/smp.c arch/x86/kernel/syscall_table_32.S include/linux/hrtimer.h kernel/printk.c kernel/sched.c kernel/sched_fair.c
| | * Merge branch 'for_linus' of ↵Linus Torvalds2011-07-21
| | |\ | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb: sparc,kgdbts: fix compile regression with kgdb test suite
| | | * sparc,kgdbts: fix compile regression with kgdb test suiteJason Wessel2011-07-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 63ab25ebbc (kgdbts: unify/generalize gdb breakpoint adjustment) introduced a compile regression on sparc. kgdbts.c: In function 'check_and_rewind_pc': kgdbts.c:307: error: implicit declaration of function 'instruction_pointer_set' Simply add the correct macro definition for instruction pointer on the Sparc architecture. Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Acked-by: Mike Frysinger <vapier@gentoo.org> Acked-by: David S. Miller <davem@davemloft.net>
| | * | x86: Make Dell Latitude E6420 use reboot=pciH. Peter Anvin2011-07-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Yet another variant of the Dell Latitude series which requires reboot=pci. From the E5420 bug report by Daniel J Blueman: > The E6420 is affected also (same platform, different casing and > features), which provides an external confirmation of the issue; I can > submit a patch for that later or include it if you prefer: > http://linux.koolsolutions.com/2009/08/04/howto-fix-linux-hangfreeze-during-reboots-and-restarts/ Reported-by: Daniel J Blueman <daniel.blueman@gmail.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Cc: <stable@kernel.org>
| | * | x86: Make Dell Latitude E5420 use reboot=pciDaniel J Blueman2011-07-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Rebooting on the Dell E5420 often hangs with the keyboard or ACPI methods, but is reliable via the PCI method. [ hpa: this was deferred because we believed for a long time that the recent reshuffling of the boot priorities in commit 660e34cebf0a11d54f2d5dd8838607452355f321 fixed this platform. Unfortunately that turned out to be incorrect. ] Signed-off-by: Daniel J Blueman <daniel.blueman@gmail.com> Link: http://lkml.kernel.org/r/1305248699-2347-1-git-send-email-daniel.blueman@gmail.com Signed-off-by: H. Peter Anvin <hpa@zytor.com> Cc: <stable@kernel.org>
| | * | Merge branch 'x86-urgent-for-linus' of ↵Linus Torvalds2011-07-20
| | |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86. reboot: Make Dell Latitude E6320 use reboot=pci x86, doc only: Correct real-mode kernel header offset for init_size x86: Disable AMD_NUMA for 32bit for now
| | | * | x86. reboot: Make Dell Latitude E6320 use reboot=pciMaxime Ripard2011-07-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The Dell Latitude E6320 doesn't reboot unless reboot=pci is set. Force it thanks to DMI. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Link: http://lkml.kernel.org/r/1309269451-4966-1-git-send-email-maxime.ripard@free-electrons.com Cc: Matthew Garrett <mjg@redhat.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
| | | * | x86: Disable AMD_NUMA for 32bit for nowTejun Heo2011-07-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 2706a0bf7b ("x86, NUMA: Enable CONFIG_AMD_NUMA on 32bit too") enabled AMD NUMA for 32bit too. Unfortunately, SPARSEMEM on 32bit had rather coarse (512MiB) addr->node mapping granularity due to lack of space in page->flags. This led to boot failure on certain AMD NUMA machines which had 128MiB alignment on nodes. Patches to properly detect this condition and reject NUMA configuration are posted[1] but deemed too pervasive for merge at this point (-rc6). Disable AMD NUMA for 32bit for now and re-enable once the detection logic is merged. [1] http://thread.gmane.org/gmane.linux.kernel/1161279/focus=1162583 Reported-by: Hans Rosenfeld <hans.rosenfeld@amd.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Conny Seidel <conny.seidel@amd.com> Link: http://lkml.kernel.org/r/20110711083432.GC943@htj.dyndns.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | Merge branch 'fixes' of ↵Linus Torvalds2011-07-20
| | |\ \ \ | | | |_|/ | | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/arm/linux-arm-soc * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/linux-arm-soc: davinci: DM365 EVM: fix video input mux bits ARM: davinci: Check for NULL return from irq_alloc_generic_chip arm: davinci: Fix low level gpio irq handlers' argument
| | | * | davinci: DM365 EVM: fix video input mux bitsJon Povey2011-07-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Video input mux settings for tvp7002 and imager inputs were swapped. Comment was correct. Tested on EVM with tvp7002 input. Signed-off-by: Jon Povey <jon.povey@racelogic.co.uk> Acked-by: Manjunath Hadli <manjunath.hadli@ti.com> Cc: stable@kernel.org Signed-off-by: Sekhar Nori <nsekhar@ti.com>
| | | * | ARM: davinci: Check for NULL return from irq_alloc_generic_chipTodd Poynor2011-07-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Avoid NULL dereference of irq_alloc_generic_chip return in low memory conditions. Signed-off-by: Todd Poynor <toddpoynor@google.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
| | | * | arm: davinci: Fix low level gpio irq handlers' argumentIdo Yariv2011-07-12
| | | |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 7416401 ("arm: davinci: Fix fallout from generic irq chip conversion") introduced a bug, causing low level interrupt handlers to get a bogus irq number as an argument. The gpio irq handler falsely assumes that the handler data is the irq base number and that is no longer true. Set the irq handler data to be a pointer to the corresponding gpio controller. The chained irq handler can then use it to extract both the irq base number and the gpio registers structure. Signed-off-by: Ido Yariv <ido@wizery.com> CC: Thomas Gleixner <tglx@linutronix.de> [nsekhar@ti.com: renamed "ctl" to "d", simplified indexing logic for chips and took care of odd bank handling in irq handler] Signed-off-by: Sekhar Nori <nsekhar@ti.com>
| | * | Merge branch 'pm-fixes' of ↵Linus Torvalds2011-07-17
| | |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6 * 'pm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6: PM / MIPS: Convert i8259.c to using syscore_ops
| | | * | PM / MIPS: Convert i8259.c to using syscore_opsRafael J. Wysocki2011-07-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The code in arch/mips/kernel/i8259.c still hasn't been converted to using struct syscore_ops instead of a sysdev for resume and shutdown. As a result, this code doesn't build any more after suspend, resume and shutdown callbacks have been removed from struct sysdev_class. Fix this problem by converting i8259.c to using syscore_ops. Reported-and-tested-by: Roland Vossen <rvossen@broadcom.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Ralf Baechle <ralf@linux-mips.org>
| | * | | Merge branch 's5p-fixes-for-linus' of ↵Linus Torvalds2011-07-17
| | |\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung * 's5p-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung: ARM: SAMSUNG: DMA Cleanup as per sparse ARM: SAMSUNG: Check NULL return from irq_alloc_generic_chip
| | | * | | ARM: SAMSUNG: DMA Cleanup as per sparseSangwook Lee2011-07-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Function declaration differs between file: dma.c and file:dma.h and SPARSE (Documentation/sparse.txt) gives error messages All dma channels are members of 'enum dma_ch' and not 'unsigned int' Please have a look at channel definitions in: arch/arm/mach-s3c64xx/include/mach/dma.h arch/arm/plat-samsung/include/plat/s3c-dma-pl330.h arch/arm/mach-s3c2410/include/mach/dma.h So all arguments should be of type 'enum dma_ch' Signed-off-by: Sangwook Lee <sangwook.lee@linaro.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
| | | * | | ARM: SAMSUNG: Check NULL return from irq_alloc_generic_chipTodd Poynor2011-07-15
| | | | |/ | | | |/| | | | | | | | | | | | | | | | Signed-off-by: Todd Poynor <toddpoynor@google.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
| | * | | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6Linus Torvalds2011-07-17
| | |\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6: sparc: sun4m SMP: fix wrong shift instruction in IPI handler sparc32,leon: Added __init declaration to leon_flush_needed() sparc/irqs: Do not trace arch_local_{*,irq_*} functions
| | | * | | sparc: sun4m SMP: fix wrong shift instruction in IPI handlerWill Simoneau2011-07-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This shift instruction appears to be shifting in the wrong direction. Without this change, my SparcStation-20MP hangs just after bringing up the second CPU: Entering SMP Mode... Starting CPU 2 at f02b4e90 Brought up 2 CPUs Total of 2 processors activated (99.52 BogoMIPS). *** stuck *** Signed-off-by: Will Simoneau <simoneau@ele.uri.edu> Signed-off-by: David S. Miller <davem@davemloft.net>
| | | * | | sparc32,leon: Added __init declaration to leon_flush_needed()Matthias Rosenfelder2011-07-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The function leon_flush_needed() is called only during bootup from another __init function. Therefore, we can also add __init to leon_flush_needed(). Signed-off-by: Matthias Rosenfelder <rosenfelder.lkml@googlemail.com> Acked-by: Daniel Hellstrom <daniel@gaisler.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| | | * | | sparc/irqs: Do not trace arch_local_{*,irq_*} functionsSteven Rostedt2011-07-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Do not trace arch_local_save_flags(), arch_local_irq_*() and friends. Although they are marked inline, gcc may still make a function out of them and add it to the pool of functions that are traced by the function tracer. This can cause undesirable results (kernel panic, triple faults, etc). Add the notrace notation to prevent them from ever being traced. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: David S. Miller <davem@davemloft.net>
| | * | | | ARM: fix regression in IXP4xx clocksourceRichard Cochran2011-07-15
| | | |_|/ | | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 234b6ceddb4fc2a4bc5b9a7670f070f6e69e0868 clocksource: convert ARM 32-bit up counting clocksources broke the build for ixp4xx and made big endian operation impossible. This commit restores the original behaviour. Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl> [ Thomas says that we might want to have generic BE accessor functions to the MMIO clock source, but that hasn't happened yet, so in the meantime this seems to be the short-term fix for the particular problem - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| | * | | Merge branch 'merge' of ↵Linus Torvalds2011-07-12
| | |\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: powerpc/mm: Fix memory_block_size_bytes() for non-pseries mm: Move definition of MIN_MEMORY_BLOCK_SIZE to a header
| | | * | | powerpc/mm: Fix memory_block_size_bytes() for non-pseriesBenjamin Herrenschmidt2011-07-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Just compiling pseries in the kernel causes it to override memory_block_size_bytes() regardless of what is the runtime platform. This cleans up the implementation of that function, fixing a bug or two while at it, so that it's harmless (and potentially useful) for other platforms. Without this, bugs in that code would trigger a WARN_ON() in drivers/base/memory.c when booting some different platforms. If/when we have another platform supporting memory hotplug we might want to either move that out to a generic place or make it a ppc_md. callback. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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