- 02 May, 2007 40 commits
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Rusty Russell authored
Now we have an explicit per-cpu GDT variable, we don't need to keep the descriptors around to use them to find the GDT: expose cpu_gdt directly. We could go further and make load_gdt() pack the descriptor for us, or even assume it means "load the current cpu's GDT" which is what it always does. Signed-off-by:
Rusty Russell <rusty@rustcorp.com.au> Signed-off-by:
Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@suse.de> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org>
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Bernhard Walle authored
Fix "Section mismatch" warnings in arch/x86_64/kernel/time.c Signed-off-by:
Bernhard Walle <bwalle@suse.de> Signed-off-by:
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Jan Beulich authored
commit 5e518d76 did the same change to i386's variant. With this change, i386's and x86-64's versions are identical, raising the question whether the x86-64 one should go (just like there's only one instance of edd.S). Signed-off-by:
Jan Beulich <jbeulich@novell.com> Signed-off-by:
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Konrad Rzeszutek authored
This patch touches the NMI watchdog every MAX_ORDER_NR_PAGES to inhibit the machine from triggering an NMI while the CPUs are locked. This situation is happening on boxes with more than 64CPUs and 128GB of RAM when Alt-SysRq-m is performed. It has been succesfully tested for regression on uni, 2, 4, 8 32, and 64 CPU boxes with various memory configuration. Signed-off-by: -
Eric Dumazet authored
Current vsyscall_gtod_data is large (3 or 4 cache lines dirtied at timer interrupt). We can shrink it to exactly 64 bytes (1 cache line on AMD64) Instead of copying a whole struct clocksource, we copy only needed fields. I deleted an unused field : offset_base This patch fixes one oddity in vgettimeofday(): It can returns a timeval with tv_usec = 1000000. Maybe not a bug, but why not doing the right thing ? Signed-off-by:
Eric Dumazet <dada1@cosmosbay.com> Signed-off-by:
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Eric Dumazet authored
There is a tiny probability that the return value from vtime(time_t *t) is Signed-off-by:
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Adrian Bunk authored
Many years ago, UNEXPECTED_IO_APIC() contained printk()'s (but nothing more). Now that it's completely empty for years, we can as well remove it. Signed-off-by:
Adrian Bunk <bunk@stusta.de> Signed-off-by:
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Adrian Bunk authored
- there's no reason for duplicating the prototype from include/linux/syscalls.h in include/asm-x86_64/unistd.h - every file should #include the headers containing the prototypes for it's global functions Signed-off-by:
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Christoph Lameter authored
x86_64 currently simulates a list using the index and private fields of the page struct. Seems that the code was inherited from i386. But x86_64 does not use the slab to allocate pgds and pmds etc. So the lru field is not used by the slab and therefore available. This patch uses standard list operations on page->lru to realize pgd tracking. Signed-off-by:
Christoph Lameter <clameter@sgi.com> Signed-off-by:
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Parag Warudkar authored
Signed-off-by:
Parag Warudkar <parag.warudkar@gmail.com> Signed-off-by:
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Andi Kleen authored
suggested by Jan Beulich Signed-off-by: -
Andi Kleen authored
Move X86_EFLAGS_IF et al out to a new header: processor-flags.h, so we can include it from irqflags.h and use it in raw_irqs_disabled_flags(). As a side-effect, we could now use these flags in .S files. Signed-off-by:
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Parag Warudkar authored
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Jan Beulich authored
On x86-64, kernel memory freed after init can be entirely unmapped instead of just getting 'poisoned' by overwriting with a debug pattern. On i386 and x86-64 (under CONFIG_DEBUG_RODATA), kernel text and bug table can also be write-protected. Compared to the first version, this one prevents re-creating deleted mappings in the kernel image range on x86-64, if those got removed previously. This, together with the original changes, prevents temporarily having inconsistent mappings when cacheability attributes are being changed on such pages (e.g. from AGP code). While on i386 such duplicate mappings don't exist, the same change is done there, too, both for consistency and because checking pte_present() before using various other pte_XXX functions is a requirement anyway. At once, i386 code gets adjusted to use pte_huge() instead of open coding this. AK: split out cpa() changes Signed-off-by:
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Jan Beulich authored
Fix various broken corner cases in i386 and x86-64 change_page_attr. AK: split off from tighten kernel image access rights Signed-off-by:
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Rusty Russell authored
paravirt.c used to implement native versions of all low-level functions. Far cleaner is to have the native versions exposed in the headers and as inline native_XXX, and if !CONFIG_PARAVIRT, then simply #define XXX native_XXX. There are several nice side effects: 1) write_dt_entry() now takes the correct "struct Xgt_desc_struct *" not "void *". 2) load_TLS is reintroduced to the for loop, not manually unrolled with a #error in case the bounds ever change. 3) Macros become inlines, with type checking. 4) Access to the native versions is trivial for KVM, lguest, Xen and others who might want it. Signed-off-by:
Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by:
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Sebastien Dugue authored
Rename boot_gdt_table to boot_gdt to avoid the duplicate T(able). Signed-off-by:
Sebastien Dugue <sebastien.dugue@bull.net> Signed-off-by:
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Rusty Russell authored
We now have cpu_init() and secondary_cpu_init() doing nothing but calling _cpu_init() with the same arguments. Rename _cpu_init() to cpu_init() and use it as a replcement for secondary_cpu_init(). Signed-off-by:
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Rusty Russell authored
Now we are no longer dynamically allocating the GDT, we don't need the "cpu_gdt_table" at all: we can switch straight from "boot_gdt_table" to the per-cpu GDT. This means initializing the cpu_gdt array in C. The boot CPU uses the per-cpu var directly, then in smp_prepare_cpus() it switches to the per-cpu copy just allocated. For secondary CPUs, the early_gdt_descr is set to point directly to their per-cpu copy. For UP the code is very simple: it keeps using the "per-cpu" GDT as per SMP, but we never have to move. Signed-off-by:
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Rusty Russell authored
Allocating PDA and GDT at boot is a pain. Using simple per-cpu variables adds happiness (although we need the GDT page-aligned for Xen, which we do in a followup patch). [akpm@linux-foundation.org: build fix] Signed-off-by:
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Bernhard Walle authored
Because the command line is increased to 2048 characters after 2.6.21, it's not possible for boot loaders and userspace tools to determine the length of the command line the kernel can understand. The benefit of knowing the length is that users can be warned if the command line size is too long which prevents surprise if things don't work after bootup. This patch updates the boot protocol to contain a field called "cmdline_size" that contain the length of the command line (excluding the terminating zero). The patch also adds missing fields (of protocol version 2.05) to the x86_64 setup code. Signed-off-by:
H. Peter Anvin <hpa@zytor.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by:
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Ian Campbell authored
The specific case I am encountering is kdump under Xen with a 64 bit hypervisor and 32 bit kernel/userspace. The dump created is 64 bit due to the hypervisor but the dump kernel is 32 bit for maximum compatibility. It's possibly less likely to be useful in a purely native scenario but I see no reason to disallow it. [akpm@linux-foundation.org: build fix] Signed-off-by:
Ian Campbell <ian.campbell@xensource.com> Signed-off-by:
Vivek Goyal <vgoyal@in.ibm.com> Cc: Horms <horms@verge.net.au> Cc: Magnus Damm <magnus.damm@gmail.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by:
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Rusty Russell authored
GCC (4.1 at least) unrolls it anyway, but I can't believe this code was ever justifiable. (I've also submitted a patch which cleans up i386, which is even uglier). Signed-off-by:
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Rusty Russell authored
Whenever we schedule, __switch_to calls load_esp0 which does: tss->esp0 = thread->esp0; This is never initialized for the initial thread (ie "swapper"), so when we're scheduling that, we end up setting esp0 to 0. This is fine: the swapper never leaves ring 0, so this field is never used. lguest, however, gets upset that we're trying to used an unmapped page as our kernel stack. Rather than work around it there, let's initialize it. Signed-off-by:
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Andrew Morton authored
The lguest patches somehow managed to trigger this: In file included from arch/i386/lguest/lguest.c:38: include/asm/asm-offsets.h:67:1: warning: "VDSO_PRELINK" redefined In file included from include/linux/elf.h:7, from include/linux/module.h:15, from include/linux/device.h:21, from include/linux/interrupt.h:15, from arch/i386/lguest/lguest.c:27: include/asm/elf.h:140:1: warning: this is the location of the previous definition I assume that using the same identifier twice was a bad idea.. Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Andi Kleen <ak@suse.de> Signed-off-by: -
David Rientjes authored
Create a document to explain how to use numa=fake in conjunction with cpusets for coarse memory resource management. An attempt to get more awareness and testing for this feature. Cc: Andi Kleen <ak@suse.de> Signed-off-by:
David Rientjes <rientjes@google.com> Signed-off-by:
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Joerg Roedel authored
remove the reporting of the constant_tsc flag from the "power management" field in /proc/cpuinfo. The NULL value there was replaced by "" because the former would result in a printout of [8] if the flag is set. Signed-off-by:
Joerg Roedel <joerg.roedel@amd.com> Signed-off-by:
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David Rientjes authored
Extends the numa=fake x86_64 command-line option to split the remaining system memory into nodes of fixed size. Any leftover memory is allocated to a final node unless the command-line ends with a comma. For example: numa=fake=2*512,*128 gives two 512M nodes and the remaining system memory is split into nodes of 128M each. This is beneficial for systems where the exact size of RAM is unknown or not necessarily relevant, but the size of the remaining nodes to be allocated is known based on their capacity for resource management. Cc: Andi Kleen <ak@suse.de> Signed-off-by:
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David Rientjes authored
Extends the numa=fake x86_64 command-line option to split the remaining system memory into equal-sized nodes. For example: numa=fake=2*512,4* gives two 512M nodes and the remaining system memory is split into four approximately equal chunks. This is beneficial for systems where the exact size of RAM is unknown or not necessarily relevant, but the granularity with which nodes shall be allocated is known. Cc: Andi Kleen <ak@suse.de> Signed-off-by:
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David Rientjes authored
Extends the numa=fake x86_64 command-line option to allow for configurable node sizes. These nodes can be used in conjunction with cpusets for coarse memory resource management. The old command-line option is still supported: numa=fake=32 gives 32 fake NUMA nodes, ignoring the NUMA setup of the actual machine. But now you may configure your system for the node sizes of your choice: numa=fake=2*512,1024,2*256 gives two 512M nodes, one 1024M node, two 256M nodes, and the rest of system memory to a sixth node. The existing hash function is maintained to support the various node sizes that are possible with this implementation. Each node of the same size receives roughly the same amount of available pages, regardless of any reserved memory with its address range. The total available pages on the system is calculated and divided by the number of equal nodes to allocate. These nodes are then dynamically allocated and their borders extended until such time as their number of available pages reaches the required size. Configurable node sizes are recommended when used in conjunction with cpusets for memory control because it eliminates the overhead associated with scanning the zonelists of many smaller full nodes on page_alloc(). Cc: Andi Kleen <ak@suse.de> Signed-off-by:
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Ahmed S. Darwish authored
Fix comments to represent the true number of quadwords in GDT. Signed-off-by:
Ahmed S. Darwish <darwish.07@gmail.com> Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by:
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Adrian Bunk authored
This patch makes the needlessly global vmi_pmd_clear() static. Signed-off-by:
Zachary Amsden <zach@vmware.com> Signed-off-by:
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Adrian Bunk authored
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Yinghai Lu authored
Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by:
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Ralf Baechle authored
Reorder code to avoid multiple inclusion of elf.h. #undef several symbols to avoid build errors over redefinitions. Signed-off-by:
Ralf Baechle <ralf@linux-mips.org> Signed-off-by:
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john stultz authored
Change mark_tsc_unstable() so it takes a string argument, which holds the reason the TSC was marked unstable. This is then displayed the first time mark_tsc_unstable is called. This should help us better debug why the TSC was marked unstable on certain systems and allow us to make sure we're not being overly paranoid when throwing out this troublesome clocksource. Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andi Kleen <ak@suse.de> Signed-off-by:
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Adrian Bunk authored
Work around a warning with -Wmissing-prototypes in arch/i386/kernel/asm-offsets.c The warning isn't gcc's fault - asm-offsets.c is simply a special file. Signed-off-by:
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Ken Chen authored
clean up unneeded type cast by properly declare data type. Signed-off-by:
Ken Chen <kenchen@google.com> Signed-off-by:
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Adrian Bunk authored
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Vivek Goyal authored
o Modpost generates warnings for i386 if compiled with CONFIG_RELOCATABLE=y WARNING: vmlinux - Section mismatch: reference to .init.text:find_unisys_acpi_oem_table from .text between 'acpi_madt_oem_check' (at offset 0xc0101eda) and 'enable_apic_mode' WARNING: vmlinux - Section mismatch: reference to .init.text:acpi_get_table_header_early from .text between 'acpi_madt_oem_check' (at offset 0xc0101ef0) and 'enable_apic_mode' WARNING: vmlinux - Section mismatch: reference to .init.text:parse_unisys_oem from .text between 'acpi_madt_oem_check' (at offset 0xc0101f2e) and 'enable_apic_mode' WARNING: vmlinux - Section mismatch: reference to .init.text:setup_unisys from .text between 'acpi_madt_oem_check' (at offset 0xc0101f37) and 'enable_apic_mode'WARNING: vmlinux - Section mismatch: reference to .init.text:parse_unisys_oem from .text between 'mps_oem_check' (at offset 0xc0101ec7) and 'acpi_madt_oem_check' WARNING: vmlinux - Section mismatch: reference to .init.text:es7000_sw_apic from .text between 'enable_apic_mode' (at offset 0xc0101f48) and 'check_apicid_present' o Some functions which are inline (acpi_madt_oem_check) are not inlined by compiler as these functions are accessed using function pointer. These functions are put in .text section and they in-turn access __init type functions hence modpost generates warnings. o Do not iniline acpi_madt_oem_check, instead make it __init. Signed-off-by:
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