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* x86: delete __cpuinit usage from all x86 filesPaul Gortmaker2013-07-141-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The __cpuinit type of throwaway sections might have made sense some time ago when RAM was more constrained, but now the savings do not offset the cost and complications. For example, the fix in commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time") is a good example of the nasty type of bugs that can be created with improper use of the various __init prefixes. After a discussion on LKML[1] it was decided that cpuinit should go the way of devinit and be phased out. Once all the users are gone, we can then finally remove the macros themselves from linux/init.h. Note that some harmless section mismatch warnings may result, since notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c) are flagged as __cpuinit -- so if we remove the __cpuinit from arch specific callers, we will also get section mismatch warnings. As an intermediate step, we intend to turn the linux/init.h cpuinit content into no-ops as early as possible, since that will get rid of these warnings. In any case, they are temporary and harmless. This removes all the arch/x86 uses of the __cpuinit macros from all C files. x86 only had the one __CPUINIT used in assembly files, and it wasn't paired off with a .previous or a __FINIT, so we can delete it directly w/o any corresponding additional change there. [1] https://lkml.org/lkml/2013/5/20/589 Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: x86@kernel.org Acked-by: Ingo Molnar <mingo@kernel.org> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: H. Peter Anvin <hpa@linux.intel.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
* x86, topology: Debug CPU0 hotplugFenghua Yu2012-11-141-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | CONFIG_DEBUG_HOTPLUG_CPU0 is for debugging the CPU0 hotplug feature. The switch offlines CPU0 as soon as possible and boots userspace up with CPU0 offlined. User can online CPU0 back after boot time. The default value of the switch is off. To debug CPU0 hotplug, you need to enable CPU0 offline/online feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during compilation or giving cpu0_hotplug kernel parameter at boot. It's safe and early place to take down CPU0 after all hotplug notifiers are installed and SMP is booted. Please note that some applications or drivers, e.g. some versions of udevd, during boot time may put CPU0 online again in this CPU0 hotplug debug mode. In this debug mode, setup_local_APIC() may report a warning on max_loops<=0 when CPU0 is onlined back after boot time. This is because pending interrupt in IRR can not move to ISR. The warning is not CPU0 specfic and it can happen on other CPUs as well. It is harmless except the first CPU0 online takes a bit longer time. And so this debug mode is useful to expose this issue. I'll send a seperate patch to fix this generic warning issue. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Link: http://lkml.kernel.org/r/1352835171-3958-15-git-send-email-fenghua.yu@intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
* x86, hotplug: Wake up CPU0 via NMI instead of INIT, SIPI, SIPIFenghua Yu2012-11-141-0/+1
| | | | | | | | | | | | | | | | | Instead of waiting for STARTUP after INITs, BSP will execute the BIOS boot-strap code which is not a desired behavior for waking up BSP. To avoid the boot-strap code, wake up CPU0 by NMI instead. This works to wake up soft offlined CPU0 only. If CPU0 is hard offlined (i.e. physically hot removed and then hot added), NMI won't wake it up. We'll change this code in the future to wake up hard offlined CPU0 if real platform and request are available. AP is still waken up as before by INIT, SIPI, SIPI sequence. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Link: http://lkml.kernel.org/r/1352896613-25957-1-git-send-email-fenghua.yu@intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
* x86: Fix mwait_usable section mismatchBorislav Petkov2011-02-141-1/+1
| | | | | | | | We use it in non __cpuinit code now too so drop marker. Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> LKML-Reference: <20110211171754.GA21047@aftab> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86, hotplug: Fix powersavings with offlined cores on AMDBorislav Petkov2011-01-211-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | ea53069231f9317062910d6e772cca4ce93de8c8 made a CPU use monitor/mwait when offline. This is not the optimal choice for AMD wrt to powersavings and we'd prefer our cores to halt (i.e. enter C1) instead. For this, the same selection whether to use monitor/mwait has to be used as when we select the idle routine for the machine. With this patch, offlining cores 1-5 on a X6 machine allows core0 to boost again. [ hpa: putting this in urgent since it is a (power) regression fix ] Reported-by: Andreas Herrmann <andreas.herrmann3@amd.com> Cc: stable@kernel.org # 37.x Cc: H. Peter Anvin <hpa@linux.intel.com> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Len Brown <lenb@kernel.org> Cc: Venkatesh Pallipadi <venki@google.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.hl> Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> LKML-Reference: <1295534572-10730-1-git-send-email-bp@amd64.org> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
* x86, cleanup: Remove obsolete boot_cpu_id variableRobert Richter2010-08-121-1/+0
| | | | | | | | | | | | | | | | boot_cpu_id is there for historical reasons and was renamed to boot_cpu_physical_apicid in patch: c70dcb7 x86: change boot_cpu_id to boot_cpu_physical_apicid However, there are some remaining occurrences of boot_cpu_id that are never touched in the kernel and thus its value is always 0. This patch removes boot_cpu_id completely. Signed-off-by: Robert Richter <robert.richter@amd.com> LKML-Reference: <1279731838-1522-8-git-send-email-robert.richter@amd.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
* x86: generalize boot_cpu_idIngo Molnar2009-01-291-5/+1
| | | | | | | | x86/Voyager can boot on non-zero processors. While that can probably be fixed by properly remapping the physical CPU IDs, keep boot_cpu_id for now for easier transition - and expand it to all of x86. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: smp.h move boot_cpu_id declartion to cpu.hJaswinder Singh Rajput2009-01-071-0/+7
| | | | | | | Impact: cleanup Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: smp.h move cpu_physical_id declartion to cpu.hJaswinder Singh Rajput2009-01-071-0/+1
| | | | | | | Impact: cleanup Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: smp.h move safe_smp_processor_id declartion to cpu.hJaswinder Singh Rajput2009-01-071-0/+1
| | | | | | | Impact: cleanup Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: smp.h move stack_processor_id declartion to cpu.hJaswinder Singh Rajput2009-01-071-0/+2
| | | | | | | Impact: cleanup Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: smp.h move prefill_possible_map declartion to cpu.hJaswinder Singh Rajput2009-01-071-0/+10
| | | | | | | Impact: cleanup, moving NON-SMP stuff from smp.h Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: Fix ASM_X86__ header guardsH. Peter Anvin2008-10-221-3/+3
| | | | | | | | | Change header guards named "ASM_X86__*" to "_ASM_X86_*" since: a. the double underscore is ugly and pointless. b. no leading underscore violates namespace constraints. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
* x86, um: ... and asm-x86 moveAl Viro2008-10-221-0/+20
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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