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2008-07-15Merge branch 'timers/for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'timers/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86: add PCI ID for 6300ESB force hpet x86: add another PCI ID for ICH6 force-hpet kernel-paramaters: document pmtmr= command line option acpi_pm clccksource: fix printk format warning nohz: don't stop idle tick if softirqs are pending. pmtmr: allow command line override of ioport nohz: reduce jiffies polling overhead hrtimer: Remove unused variables in ktime_divns() hrtimer: remove warning in hres_timers_resume posix-timers: print RT watchdog message
2008-07-15Merge branch 'core/stacktrace' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core/stacktrace' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: generic-ipi: powerpc/generic-ipi tree build failure stacktrace: fix build failure on sparc64 stacktrace: export save_stack_trace[_tsk] stacktrace: fix modular build, export print_stack_trace and save_stack_trace backtrace: replace timer with tasklet + completions stacktrace: add saved stack traces to backtrace self-test stacktrace: print_stack_trace() cleanup debugging: make stacktrace independent from DEBUG_KERNEL stacktrace: don't crash on invalid stack trace structs
2008-07-15x86: sanitize KconfigThomas Gleixner
Set default n for MEMTEST and MTRR_SANITIZER and fix the help texts. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-07-15Merge branch 'linus' into x86/urgentIngo Molnar
2008-07-14Merge branch 'for-2.6.27' of git://git.infradead.org/users/dwmw2/firmware-2.6Linus Torvalds
* 'for-2.6.27' of git://git.infradead.org/users/dwmw2/firmware-2.6: (64 commits) firmware: convert sb16_csp driver to use firmware loader exclusively dsp56k: use request_firmware edgeport-ti: use request_firmware() edgeport: use request_firmware() vicam: use request_firmware() dabusb: use request_firmware() cpia2: use request_firmware() ip2: use request_firmware() firmware: convert Ambassador ATM driver to request_firmware() whiteheat: use request_firmware() ti_usb_3410_5052: use request_firmware() emi62: use request_firmware() emi26: use request_firmware() keyspan_pda: use request_firmware() keyspan: use request_firmware() ttusb-budget: use request_firmware() kaweth: use request_firmware() smctr: use request_firmware() firmware: convert ymfpci driver to use firmware loader exclusively firmware: convert maestro3 driver to use firmware loader exclusively ... Fix up trivial conflicts with BKL removal in drivers/char/dsp56k.c and drivers/char/ip2/ip2main.c manually.
2008-07-14Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.gitDavid Woodhouse
Conflicts: sound/pci/Kconfig
2008-07-14Merge branch 'core/rodata' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core/rodata' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: move BUG_TABLE into RODATA
2008-07-14Merge branch 'core/printk' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core/printk' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86, generic: mark early_printk as asmlinkage printk: export console_drivers printk: remember the message level for multi-line output printk: refactor processing of line severity tokens printk: don't prefer unsuited consoles on registration printk: clean up recursion check related static variables namespacecheck: more kernel/printk.c fixes namespacecheck: fix kernel printk.c
2008-07-14x86: MMIOTRACE should not default to onLinus Torvalds
Even the help-text makes it clear that normal people shouldn't enable it. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-14Merge branch 'tracing/for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'tracing/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (228 commits) ftrace: build fix for ftraced_suspend ftrace: separate out the function enabled variable ftrace: add ftrace_kill_atomic ftrace: use current CPU for function startup ftrace: start wakeup tracing after setting function tracer ftrace: check proper config for preempt type ftrace: trace schedule ftrace: define function trace nop ftrace: move sched_switch enable after markers ftrace: prevent ftrace modifications while being kprobe'd, v2 fix "ftrace: store mcount address in rec->ip" mmiotrace broken in linux-next (8-bit writes only) ftrace: avoid modifying kprobe'd records ftrace: freeze kprobe'd records kprobes: enable clean usage of get_kprobe ftrace: store mcount address in rec->ip ftrace: build fix with gcc 4.3 namespacecheck: fixes ftrace: fix "notrace" filtering priority ftrace: fix printout ...
2008-07-14Merge branch 'bkl-removal' of git://git.lwn.net/linux-2.6Linus Torvalds
* 'bkl-removal' of git://git.lwn.net/linux-2.6: (146 commits) IB/umad: BKL is not needed for ib_umad_open() IB/uverbs: BKL is not needed for ib_uverbs_open() bf561-coreb: BKL unneeded for open() Call fasync() functions without the BKL snd/PCM: fasync BKL pushdown ipmi: fasync BKL pushdown ecryptfs: fasync BKL pushdown Bluetooth VHCI: fasync BKL pushdown tty_io: fasync BKL pushdown tun: fasync BKL pushdown i2o: fasync BKL pushdown mpt: fasync BKL pushdown Remove BKL from remote_llseek v2 Make FAT users happier by not deadlocking x86-mce: BKL pushdown vmwatchdog: BKL pushdown vmcp: BKL pushdown via-pmu: BKL pushdown uml-random: BKL pushdown uml-mmapper: BKL pushdown ...
2008-07-14Merge commit 'v2.6.26' into bkl-removalJonathan Corbet
2008-07-14Merge branch 'x86/for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (821 commits) x86: make 64bit hpet_set_mapping to use ioremap too, v2 x86: get x86_phys_bits early x86: max_low_pfn_mapped fix #4 x86: change _node_to_cpumask_ptr to return const ptr x86: I/O APIC: remove an IRQ2-mask hack x86: fix numaq_tsc_disable calling x86, e820: remove end_user_pfn x86: max_low_pfn_mapped fix, #3 x86: max_low_pfn_mapped fix, #2 x86: max_low_pfn_mapped fix, #1 x86_64: fix delayed signals x86: remove conflicting nx6325 and nx6125 quirks x86: Recover timer_ack lost in the merge of the NMI watchdog x86: I/O APIC: Never configure IRQ2 x86: L-APIC: Always fully configure IRQ0 x86: L-APIC: Set IRQ0 as edge-triggered x86: merge dwarf2 headers x86: use AS_CFI instead of UNWIND_INFO x86: use ignore macro instead of hash comment x86: use matching CFI_ENDPROC ...
2008-07-14Start using the new '%pS' infrastructure to print symbolsLinus Torvalds
This simplifies the code significantly, and was the whole point of the exercise. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-14x86, suspend, acpi: correct and add comments about Big Real ModeH. Peter Anvin
Explain that we set up the descriptors for Big Real Mode, and why we do so. In particular, one system that is known to fail without it is the Lenovo X61. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2008-07-14x86, suspend, acpi: enter Big Real ModeH. Peter Anvin
The explanation for recent video BIOS suspend quirk failures is that the VESA BIOS expects to be entered in Big Real Mode (*.limit = 0xffffffff) instead of ordinary Real Mode (*.limit = 0xffff). This patch changes the segment descriptors to Big Real Mode instead. The segment descriptor registers (what Intel calls "segment cache") is always active. The only thing that changes based on CR0.PE is how it is *loaded* and the interpretation of the CS flags. The segment descriptor registers contain of the following sub-registers: selector (the "visible" part), base, limit and flags. In protected mode or long mode, they are loaded from descriptors (or fs.base or gs.base can be manipulated directly in long mode.) In real mode, the only thing changed by a segment register load is the selector and the base, where the base <- selector << 4. In particular, *the limit and the flags are not changed*. As far as the handling of the CS flags: a code segment cannot be writable in protected mode, whereas it is "just another segment" in real mode, so there is some kind of quirk that kicks in for this when CR0.PE <- 0. I'm not sure if this is accomplished by actually changing the cs.flags register or just changing the interpretation; it might be something that is CPU-specific. In particular, the Transmeta CPUs had an explicit "CS is writable if you're in real mode" override, so even if you had loaded CS with an execute-only segment it'd be writable (but not readable!) on return to real mode. I'm not at all sure if that is how other CPUs behave. Signed-off-by: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-14x86: add PCI ID for 6300ESB force hpetJoe Buehler
00:1f.0 ISA bridge: Intel Corporation 6300ESB LPC Interface Controller (rev 02) 00:1f.0 Class 0601: 8086:25a1 (rev 02) kernel: pci 0000:00:1f.0: Force enabled HPET at 0xfed00000 kernel: hpet clockevent registered kernel: hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0 kernel: hpet0: 3 64-bit timers, 14318180 Hz Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-07-14x86: add another PCI ID for ICH6 force-hpetKrzysztof Oledzki
Tested on Asus P5GDC-V $ lspci -n -n |grep ISA 00:1f.0 ISA bridge [0601]: Intel Corporation 82801FB/FR (ICH6/ICH6R) LPC Interface Bridge [8086:2640] (rev 03) Force enabled HPET at base address 0xfed00000 hpet clockevent registered hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0 hpet0: 3 64-bit timers, 14318180 Hz Signed-off-by: Krzysztof Piotr Oledzki <ole@ans.pl> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-07-14Merge branch 'auto-ftrace-next' into tracing/for-linusIngo Molnar
Conflicts: arch/x86/kernel/entry_32.S arch/x86/kernel/process_32.c arch/x86/kernel/process_64.c arch/x86/lib/Makefile include/asm-x86/irqflags.h kernel/Makefile kernel/sched.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-14x86: make 64bit hpet_set_mapping to use ioremap too, v2Yinghai Lu
keep the one for VSYSCALL_HPET Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-14x86: get x86_phys_bits earlyYinghai Lu
when try to make hpet_enable use io_remap instead fixmap got ioremap: invalid physical address fed00000 ------------[ cut here ]------------ WARNING: at arch/x86/mm/ioremap.c:161 __ioremap_caller+0x8c/0x2f3() Modules linked in: Pid: 0, comm: swapper Not tainted 2.6.26-rc9-tip-01873-ga9827e7-dirty #358 Call Trace: [<ffffffff8026615e>] warn_on_slowpath+0x6c/0xa7 [<ffffffff802e2313>] ? __slab_alloc+0x20a/0x3fb [<ffffffff802d85c5>] ? mpol_new+0x88/0x17d [<ffffffff8022a4f4>] ? mcount_call+0x5/0x31 [<ffffffff8022a4f4>] ? mcount_call+0x5/0x31 [<ffffffff8024b0d2>] __ioremap_caller+0x8c/0x2f3 [<ffffffff80e86dbd>] ? hpet_enable+0x39/0x241 [<ffffffff8022a4f4>] ? mcount_call+0x5/0x31 [<ffffffff8024b466>] ioremap_nocache+0x2a/0x40 [<ffffffff80e86dbd>] hpet_enable+0x39/0x241 [<ffffffff80e7a1f6>] hpet_time_init+0x21/0x4e [<ffffffff80e730e9>] start_kernel+0x302/0x395 [<ffffffff80e722aa>] x86_64_start_reservations+0xb9/0xd4 [<ffffffff80e722fe>] ? x86_64_init_pda+0x39/0x4f [<ffffffff80e72400>] x86_64_start_kernel+0xec/0x107 ---[ end trace a7919e7f17c0a725 ]--- it seems for amd system that is set later... try to move setting early in early_identify_cpu. and remove same code for intel and centaur. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-14x86: max_low_pfn_mapped fix #4Yinghai Lu
only add direct mapping for aperture Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-13x86: change _node_to_cpumask_ptr to return const ptrMike Travis
* Strengthen the return type for the _node_to_cpumask_ptr to be a const pointer. This adds compiler checking to insure that node_to_cpumask_map[] is not changed inadvertently. Signed-off-by: Mike Travis <travis@sgi.com> Cc: "akpm@linux-foundation.org" <akpm@linux-foundation.org> Cc: Yinghai Lu <yhlu.kernel@gmail.com> Acked-by: Vegard Nossum <vegard.nossum@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-13x86: I/O APIC: remove an IRQ2-mask hackMaciej W. Rozycki
Now that IRQ2 is never made available to the I/O APIC, there is no need to special-case it and mask as a workaround for broken systems. Actually, because of the former, mask_IO_APIC_irq(2) is a no-op already. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Andreas Herrmann <andreas.herrmann3@amd.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-13x86: fix numaq_tsc_disable callingYinghai Lu
got this on a test-system: calling numaq_tsc_disable+0x0/0x39 NUMAQ: disabling TSC initcall numaq_tsc_disable+0x0/0x39 returned 0 after 0 msecs that's because we should not be using arch_initcall to call numaq_tsc_disable. need to call it in setup_arch before time_init()/tsc_init() and call it in init_intel() to make the cpu feature bits right. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-13x86, e820: remove end_user_pfnYinghai Lu
end_user_pfn used to modify the meaning of the e820 maps. Now that all e820 operations are cleaned up, unified, tightened up, the e820 map always get updated to reality, we don't need to keep this secondary mechanism anymore. If you hit this commit in bisection it means something slipped through. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-13x86: max_low_pfn_mapped fix, #3Yinghai Lu
optimization: try to merge the range with same page size in init_memory_mapping, to get the best possible linear mappings set up. thus when GBpages is not there, we could do 2M pages. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-13x86: max_low_pfn_mapped fix, #2Yinghai Lu
tighten the boundary checks around max_low_pfn_mapped - dont overmap nor undermap into holes. also print out tseg for AMD cpus, for diagnostic purposes. (this is an SMM area, and we split up any big mappings around that area) Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-13x86: max_low_pfn_mapped fix, #1Yinghai Lu
fix crash on Ingo's big box: calling pci_iommu_init+0x0/0x17 PCI-DMA: Disabling AGP. PCI-DMA: aperture base @ d0000000 size 65536 KB PCI-DMA: using GART IOMMU. PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture BUG: unable to handle kernel paging request at ffff88000003be88 IP: [<ffffffff8026d377>] __alloc_pages_internal+0xc3/0x3f2 PGD 202063 PUD 206063 PMD 22fc00163 PTE 3b162 Oops: 0000 [1] SMP and e820 is: BIOS-e820: 0000000000000000 - 000000000009ac00 (usable) BIOS-e820: 000000000009ac00 - 00000000000a0000 (reserved) BIOS-e820: 00000000000ca000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 000000007ff70000 (usable) BIOS-e820: 000000007ff70000 - 000000007ff86000 (ACPI data) BIOS-e820: 000000007ff86000 - 0000000080000000 (ACPI NVS) BIOS-e820: 0000000080000000 - 00000000cfe00000 (usable) BIOS-e820: 00000000cfe00000 - 00000000d0000000 (reserved) BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved) BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved) BIOS-e820: 0000000100000000 - 0000000830000000 (usable) system has 32 GB RAM installed. max_low_pfn_mapped is 0xcfe00, and GART aperture is not mapped. So try to use init_memory_mapping to map that area, because the iommu thinks that area is ram ... Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-12Merge branch 'linus' into x86/coreIngo Molnar
Conflicts: arch/x86/mm/ioremap.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-12x86_64: fix delayed signalsRoland McGrath
On three of the several paths in entry_64.S that call do_notify_resume() on the way back to user mode, we fail to properly check again for newly-arrived work that requires another call to do_notify_resume() before going to user mode. These paths set the mask to check only _TIF_NEED_RESCHED, but this is wrong. The other paths that lead to do_notify_resume() do this correctly already, and entry_32.S does it correctly in all cases. All paths back to user mode have to check all the _TIF_WORK_MASK flags at the last possible stage, with interrupts disabled. Otherwise, we miss any flags (TIF_SIGPENDING for example) that were set any time after we entered do_notify_resume(). More work flags can be set (or left set) synchronously inside do_notify_resume(), as TIF_SIGPENDING can be, or asynchronously by interrupts or other CPUs (which then send an asynchronous interrupt). There are many different scenarios that could hit this bug, most of them races. The simplest one to demonstrate does not require any race: when one signal has done handler setup at the check before returning from a syscall, and there is another signal pending that should be handled. The second signal's handler should interrupt the first signal handler before it actually starts (so the interrupted PC is still at the handler's entry point). Instead, it runs away until the next kernel entry (next syscall, tick, etc). This test behaves correctly on 32-bit kernels, and fails on 64-bit (either 32-bit or 64-bit test binary). With this fix, it works. #define _GNU_SOURCE #include <stdio.h> #include <signal.h> #include <string.h> #include <sys/ucontext.h> #ifndef REG_RIP #define REG_RIP REG_EIP #endif static sig_atomic_t hit1, hit2; static void handler (int sig, siginfo_t *info, void *ctx) { ucontext_t *uc = ctx; if ((void *) uc->uc_mcontext.gregs[REG_RIP] == &handler) { if (sig == SIGUSR1) hit1 = 1; else hit2 = 1; } printf ("%s at %#lx\n", strsignal (sig), uc->uc_mcontext.gregs[REG_RIP]); } int main (void) { struct sigaction sa; sigset_t set; sigemptyset (&sa.sa_mask); sa.sa_flags = SA_SIGINFO; sa.sa_sigaction = &handler; if (sigaction (SIGUSR1, &sa, NULL) || sigaction (SIGUSR2, &sa, NULL)) return 2; sigemptyset (&set); sigaddset (&set, SIGUSR1); sigaddset (&set, SIGUSR2); if (sigprocmask (SIG_BLOCK, &set, NULL)) return 3; printf ("main at %p, handler at %p\n", &main, &handler); raise (SIGUSR1); raise (SIGUSR2); if (sigprocmask (SIG_UNBLOCK, &set, NULL)) return 4; if (hit1 + hit2 == 1) { puts ("PASS"); return 0; } puts ("FAIL"); return 1; } Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-12x86: remove conflicting nx6325 and nx6125 quirksRafael J. Wysocki
We have two conflicting DMA-based quirks in there for the same set of boxes (HP nx6325 and nx6125) and one of them actually breaks my box. So remove the extra code. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: =?iso-8859-1?q?T=F6r=F6k_Edwin?= <edwintorok@gmail.com> Cc: Vegard Nossum <vegard.nossum@gmail.com> Cc: Andreas Herrmann <andreas.herrmann3@amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-11Merge branch 'x86/generalize-visws' into x86/coreIngo Molnar
2008-07-11x86: Recover timer_ack lost in the merge of the NMI watchdogMaciej W. Rozycki
In the course of the recent unification of the NMI watchdog an assignment to timer_ack to switch off unnecesary POLL commands to the 8259A in the case of a watchdog failure has been accidentally removed. The statement used to be limited to the 32-bit variation as since the rewrite of the timer code it has been relevant for the 82489DX only. This change brings it back. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-11x86: I/O APIC: Never configure IRQ2Maciej W. Rozycki
There is no such entity as ISA IRQ2. The ACPI spec does not make it explicitly clear, but does not preclude it either -- all it says is ISA legacy interrupts are identity mapped by default (subject to overrides), but it does not state whether IRQ2 exists or not. As a result if there is no IRQ0 override, then IRQ2 is normally initialised as an ISA interrupt, which implies an edge-triggered line, which is unmasked by default as this is what we do for edge-triggered I/O APIC interrupts so as not to miss an edge. To the best of my knowledge it is useless, as IRQ2 has not been in use since the PC/AT as back then it was taken by the 8259A cascade interrupt to the slave, with the line position in the slot rerouted to newly-created IRQ9. No device could thus make use of this line with the pair of 8259A chips. Now in theory INTIN2 of the I/O APIC may be usable, but the interrupt of the device wired to it would not be available in the PIC mode at all, so I seriously doubt if anybody decided to reuse it for a regular device. However there are two common uses of INTIN2. One is for IRQ0, with an ACPI interrupt override (or its equivalent in the MP table). But in this case IRQ2 is gone entirely with INTIN0 left vacant. The other one is for an 8959A ExtINTA cascade. In this case IRQ0 goes to INTIN0 and if ACPI is used INTIN2 is assumed to be IRQ2 (there is no override and ACPI has no way to report ExtINTA interrupts). This is where a problem happens. The problem is INTIN2 is configured as a native APIC interrupt, with a vector assigned and the mask cleared. And the line may indeed get active and inject interrupts if the master 8959A has its timer interrupt enabled (it might happen for other interrupts too, but they are normally masked in the process of rerouting them to the I/O APIC). There are two cases where it will happen: * When the I/O APIC NMI watchdog is enabled. This is actually a misnomer as the watchdog pulses are delivered through the 8259A to the LINT0 inputs of all the local APICs in the system. The implication is the output of the master 8259A goes high and low repeatedly, signalling interrupts to INTIN2 which is enabled too! [The origin of the name is I think for a brief period during the development we had a capability in our code to configure the watchdog to use an I/O APIC input; that would be INTIN2 in this scenario.] * When the native route of IRQ0 via INTIN0 fails for whatever reason -- as it happens with the system considered here. In this scenario the timer pulse is delivered through the 8259A to LINT0 input of the local APIC of the bootstrap processor, quite similarly to how is done for the watchdog described above. The result is, again, INTIN2 receives these pulses too. Rafael's system used to escape this scenario, because an incorrect IRQ0 override would occupy INTIN2 and prevent it from being unmasked. My conclusion is IRQ2 should be excluded from configuration in all the cases and the current exception for ACPI systems should be lifted. The reason being the exception not only being useless, but harmful as well. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Andreas Herrmann <andreas.herrmann3@amd.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-11x86: L-APIC: Always fully configure IRQ0Maciej W. Rozycki
Unlike the 32-bit one, the 64-bit variation of the LVT0 setup code for the "8259A Virtual Wire" through the local APIC timer configuration does not fully configure the relevant irq_chip structure. Instead it relies on the preceding I/O APIC code to have set it up, which does not happen if the I/O APIC variants have not been tried. The patch includes corresponding changes to the 32-bit variation too which make them both the same, barring a small syntactic difference involving sequence of functions in the source. That should work as an aid with the upcoming merge. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Andreas Herrmann <andreas.herrmann3@amd.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-11x86: L-APIC: Set IRQ0 as edge-triggeredMaciej W. Rozycki
IRQ0 is edge-triggered, but the "8259A Virtual Wire" through the local APIC configuration in the 32-bit version uses the "fasteoi" handler suitable for level-triggered APIC interrupt. Rewrite code so that the "edge" handler is used. The 64-bit version uses different code and is unaffected. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Andreas Herrmann <andreas.herrmann3@amd.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-11x86: use matching CFI_ENDPROCGlauber Costa
The RING0_INT_FRAME macro defines a CFI_STARTPROC. So we should really be using CFI_ENDPROC after it. Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-11x86_64: vdso32 cleanup using feature flagsJeremy Fitzhardinge
Use the X86_FEATURE_SYSENTER32 to remove hard-coded CPU vendor check. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-11x86_64: add pseudo-features for 32-bit compat syscallJeremy Fitzhardinge
Add pseudo-feature bits to describe whether the CPU supports sysenter and/or syscall from ia32-compat userspace. This removes a hardcoded test in vdso32-setup. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-11x86: fix tsc unification buglet with ftrace and stackprotectorIngo Molnar
Yinghai Lu reported crashes on 64-bit x86: BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 IP: [<ffffffff80253b17>] hrtick_start_fair+0x89/0x173 [...] And with a long session of debugging and a lot of difficulty, tracked it down to this commit: ---------------> 8fbbc4b45ce3e4c0eeb15004c79c72b6896a79c2 is first bad commit commit 8fbbc4b45ce3e4c0eeb15004c79c72b6896a79c2 Author: Alok Kataria <akataria@vmware.com> Date: Tue Jul 1 11:43:34 2008 -0700 x86: merge tsc_init and clocksource code <-------------- The problem is that the TSC unification missed these Makefile rules in arch/x86/kernel/Makefile: # Do not profile debug and lowlevel utilities CFLAGS_REMOVE_tsc_64.o = -pg CFLAGS_REMOVE_tsc_32.o = -pg ... CFLAGS_tsc_64.o := $(nostackp) ... which rules make sure that various instrumentation and debugging facilities are disabled for code that might end up in a VDSO - such as the TSC code. Reported-and-bisected-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Conflicts: Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-11x86: introduce max_low_pfn_mapped for 64-bitYinghai Lu
when more than 4g memory is installed, don't map the big hole below 4g. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-11x86: reserve SLITYinghai Lu
save the SLIT, in case we are using fixmap to read it, and that fixmap could be cleared by others. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-11x86: e820: user-defined memory maps: remove the range instead of update it ↵Yinghai Lu
to reserved also let mem= to print out modified e820 map too Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Bernhard Walle <bwalle@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-10x86: fix compile error in current tip.gitJeremy Fitzhardinge
Gas 2.15 complains about 32-bit registers being used in lea. AS arch/x86/lib/copy_user_64.o /local/scratch-2/jeremy/hg/xen/paravirt/linux/arch/x86/lib/copy_user_64.S: Assembler messages: /local/scratch-2/jeremy/hg/xen/paravirt/linux/arch/x86/lib/copy_user_64.S:188: Error: `(%edx,%ecx,8)' is not a valid 64 bit base/index expression /local/scratch-2/jeremy/hg/xen/paravirt/linux/arch/x86/lib/copy_user_64.S:257: Error: `(%edx,%ecx,8)' is not a valid 64 bit base/index expression AS arch/x86/lib/copy_user_nocache_64.o /local/scratch-2/jeremy/hg/xen/paravirt/linux/arch/x86/lib/copy_user_nocache_64.S: Assembler messages: /local/scratch-2/jeremy/hg/xen/paravirt/linux/arch/x86/lib/copy_user_nocache_64.S:107: Error: `(%edx,%ecx,8)' is not a valid 64 bit base/index expression Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Vitaly Mayatskikh <v.mayatskih@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-10Merge branch 'x86-fixes-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86: fix /dev/mem compatibility under PAT
2008-07-10x86, VisWS: fix pci_direct_conf1 dependencyIngo Molnar
fix: arch/x86/pci/built-in.o: In function `pci_subsys_init': visws.c:(.init.text+0xfc5): undefined reference to `pci_direct_conf1' Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-10x86, VisWS: build fixIngo Molnar
fix: arch/x86/kernel/built-in.o: In function `visws_early_detect': : undefined reference to `mach_get_smp_config_quirk' arch/x86/kernel/built-in.o: In function `visws_early_detect': : undefined reference to `mach_find_smp_config_quirk' Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-10x86: remove duplicate call to use_tsc_delayGlauber Costa
Integration generated a duplicate call to use_tsc_delay. Particularly, the one that is done before we check for general tsc usability seems wrong. Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-10x86, VisWS: build fixIngo Molnar
fix: arch/x86/kernel/visws_quirks.c: In function ‘visws_early_detect’: arch/x86/kernel/visws_quirks.c:293: error: ‘no_broadcast’ undeclared (first use in this function) arch/x86/kernel/visws_quirks.c:293: error: (Each undeclared identifier is reported only once arch/x86/kernel/visws_quirks.c:293: error: for each function it appears in.) make[1]: *** [arch/x86/kernel/visws_quirks.o] Error 1 make: *** [arch/x86/kernel/visws_quirks.o] Error 2 Signed-off-by: Ingo Molnar <mingo@elte.hu>