Sam Ravnborg [Wed, 30 Jan 2008 12:33:37 +0000 (13:33 +0100)]
x86: fix section mismatch warning in acpi/boot.c
Fix following warning:
WARNING: arch/x86/kernel/built-in.o(.text+0x10ea0): Section mismatch: reference to .cpuinit.data:num_processors in 'acpi_unmap_lsapic'
The exported function acpi_unmap_lsapic() references
the variable num_processors that is annotated __cpuinitdata.
Remove the annotation of num_processors as we never know
when an exported function are called.
And drop the needless initialsation to 0.
Warning was seen on 64 bit but similar pattern were seen
in 32 bit - so fix it up there too.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Sam Ravnborg [Wed, 30 Jan 2008 12:33:37 +0000 (13:33 +0100)]
x86: fix section mismatch warning in process_*.c
Fix the following warning:
WARNING: arch/x86/kernel/built-in.o(.text+0x3): Section mismatch: reference to .cpuinit.data:force_mwait in 'mwait_usable'
[Seen on 64 bit only but similar pattern exist on 32 bit so fix it there too]
mwait_usable() were only used by a function annotated __cpuinit
so annotate mwait_usable() with __cpuinit to fix the warning.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Sam Ravnborg [Wed, 30 Jan 2008 12:33:36 +0000 (13:33 +0100)]
x86: fix section mismatch warning in mcheck/mce_amd_64.c
Fix following warning:
WARNING: arch/x86/kernel/cpu/mcheck/built-in.o(.text+0x1584): Section mismatch: reference to .cpuinit.text:threshold_create_device in 'threshold_cpu_callback'
threshold_cpu_callback() is only used by threshold_cpu_notifier.
threshold_cpu_notifier is only used for cpu hot plug as it is registered
using register_hotcpu_notifier().
Mark them both __cpuinit to fix the warning.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Sam Ravnborg [Wed, 30 Jan 2008 12:33:36 +0000 (13:33 +0100)]
x86: fix section mismatch warning in mcheck/mce_64.c
Fix following warning:
WARNING: arch/x86/kernel/cpu/mcheck/built-in.o(.text+0x752): Section mismatch: reference to .cpuinit.text:mce_create_device in 'mce_cpu_callback'
mce_cpu_callback() is only used by mce_cpu_notofier.
The notifier is only used for hotplugable cpu's as it is
registered using register_hotcpu_notifier(),
Annotate them both __cpuinit to fix the warning.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Florian Fainelli [Wed, 30 Jan 2008 12:33:36 +0000 (13:33 +0100)]
x86: add support for the RDC R-321x SoC
This patch adds support for the RDC R-321x system-on-chip,
also known as R-861x-(G). It uses the generic GPIO API and
has support for the on-chip hardware watchdog.
Build-fix from: Randy Dunlap <randy.dunlap@oracle.com>
Florian Fainelli [Wed, 30 Jan 2008 12:33:35 +0000 (13:33 +0100)]
x86: add generic GPIO support to x86
This patch adds the generic GPIO support to the x86
architecture. We do the same as for MIPS, we let
the machine override the gpio callbacks and provide
defaults one in mach-generic.
Andres Salomon [Wed, 30 Jan 2008 12:33:35 +0000 (13:33 +0100)]
x86: GEODE: update GPIO API to support setting multiple GPIOs at once
The existing Geode GPIO API only allows for updating one GPIO at once. There
are instances where users want to update multiple GPIOs at once. With the
current API, they are given two choices; either ignore the GPIO API:
Neither are desirable. This patch changes the GPIO API to allow for setting
of multiple GPIOs at once; rather than being passed an integer, we pass
a bitmask and provide a translation function. The above code would now
look like this:
Since there are no upstream users of the GPIO API yet (afaik), best to
change this now. This also adds a bit of sanity checking; it is no
longer possible to use a GPIO above 28.
Note the semantics of geode_gpio_isset() have changed:
geode_gpio_isset(geode_gpio(3)|geode_gpio(4), ...)
will only return true iff both GPIOs are set.
Signed-off-by: Andres Salomon <dilinger@debian.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Fix cpu MHz reporting for AMD family 0x11 when powernow-k8 is
disabled.
Just adhere to the CONSTANT_TSC feature bit for AMD CPUs when deciding
whether cpu_khz needs calibration. The additional check for CPU family
is not needed and prevents calibration for future CPUs.
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Minoru Usui [Wed, 30 Jan 2008 12:33:35 +0000 (13:33 +0100)]
x86: fix NUMA emulation on 64-bit
I found a small bug of NUMA emulation code for x86_64. (CONFIG_NUMA_EMU)
If machine is non-NUMA, find_node_by_addr() should return
NUMA_NO_NODE, but current implementation code returns existent maximum
NUMA node number + 1.
This is not existent NUMA node number.
However, this behaviour does not affect NUMA emulation fortunately, because
acpi_fake_nodes() that is caller of find_node_by_addr() gets pxm
(proximity domain) by node_to_pxm() from non-existent NUMA node number
that was returned by find_node_by_addr().
node_to_pxm() returns PXM_INVAL that means illegal or non-existent
NUMA node number.
Yi Yang [Wed, 30 Jan 2008 12:33:34 +0000 (13:33 +0100)]
cpufreq: fix obvious condition statement error
The function __cpufreq_set_policy in file drivers/cpufreq/cpufreq.c
has a very obvious error:
if (policy->min > data->min && policy->min > policy->max) {
ret = -EINVAL;
goto error_out;
}
This condtion statement is wrong because it returns -EINVAL only if
policy->min is greater than policy->max (in this case,
"policy->min > data->min" is true for ever.). In fact, it should
return -EINVAL as well if policy->max is less than data->min.
The correct condition should be:
if (policy->min > data->max || policy->max < data->min) {
The following test result testifies the above conclusion:
travis@sgi.com [Wed, 30 Jan 2008 12:33:33 +0000 (13:33 +0100)]
x86: early cpu_to_node fix in numa_64.c
Both of these references to cpu_to_node() can potentially occur
before the "late" cpu_to_node map is setup. Therefore, they
should be changed to use early_cpu_to_node().
Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Willy Tarreau [Wed, 30 Jan 2008 12:33:33 +0000 (13:33 +0100)]
x86: GEODE add the "mfgptfix" boot time option to fix MFGPT timers
The new "mfgptfix" boot command line option may be usd to fix MFGPT
timers on AMD Geode platforms when the BIOS has incorrectly applied
a workaround. TinyBIOS version 0.98 is known to be affected, 0.99
fixes the problem by letting the user disable the workaround.
Andi Kleen [Wed, 30 Jan 2008 12:33:32 +0000 (13:33 +0100)]
x86: remove iBCS support
ibcs2 support has never been supported on 2.6 kernels as far as I know,
and if it has it must have been an external patch. Anyways, if anybody
applies an external patch they could as well readd the ibcs checking
code to the ELF loader in the same patch. But there is no reason to
keep this code running in all Linux kernels. This will save at least
two strcmps each ELF execution.
No deprecation period because it could not have been used anyway.
Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Bernhard Walle [Wed, 30 Jan 2008 12:33:31 +0000 (13:33 +0100)]
rtc: use the IRQ callback interface in (old) RTC driver
the previous patch in the old RTC driver. It also removes the direct
rtc_interrupt() call from arch/x86/kernel/hpetc.c so that there's finally no
(code) dependency to CONFIG_RTC in arch/x86/kernel/hpet.c.
Because of this, it's possible to compile the drivers/char/rtc.ko driver as
module and still use the HPET emulation functionality. This is also expressed
in Kconfig.
Signed-off-by: Bernhard Walle <bwalle@suse.de> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: David Brownell <david-b@pacbell.net> Cc: Andi Kleen <ak@suse.de> Cc: john stultz <johnstul@us.ibm.com> Cc: Robert Picco <Robert.Picco@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Bernhard Walle [Wed, 30 Jan 2008 12:33:28 +0000 (13:33 +0100)]
x86, rtc: make CONFIG_HPET_EMULATE_RTC usable from modules
enabled, then interrupts don't work for the rtc-cmos driver which results in
RTC_AIE*, RTC_PIE* and RTC_ALM being unusable. This affects hwclock from
util-linux-ng at least on i386 since that uses RTC_PIE_ON. (For x86-64, a
polling method is used for unknown reasons.)
This patch series now
1. export the functions from arch/x86/kernel/hpet.c that the old char/rtc
driver uses to work around that problem,
2. makes it possible to compile the old rtc driver as module, while still
having CONFIG_HPET_EMULATE_RTC enabled and
3. makes use of the exported functions in (1) in the new rtc-cmos driver.
This patch:
This patch makes the RTC emulation functions in arch/x86/kernel/hpet.c usable
for kernel modules. It
- exports the functions (EXPORT_SYMBOL_GPL()),
- adds an interface to register the interrupt callback function
instead of using only a fixed callback function and
- replaces the rtc_get_rtc_time() function which depends on
CONFIG_RTC with a call to get_rtc_time() which is defined in
include/asm-generic/rtc.h.
The only dependency to CONFIG_RTC is the call to rtc_interrupt() which is
removed by the next patch. After this, there's no (code) dependency of
this functions to CONFIG_RTC=y any more.
Signed-off-by: Bernhard Walle <bwalle@suse.de> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: David Brownell <david-b@pacbell.net> Cc: Andi Kleen <ak@suse.de> Cc: john stultz <johnstul@us.ibm.com> Cc: Robert Picco <Robert.Picco@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Ian Campbell [Wed, 30 Jan 2008 12:33:27 +0000 (13:33 +0100)]
x86_32: always run the full set of paging state.
I am preparing to convert the boot time page table to the kernels
native format. To achieve that I need to enable PAE. Enabling PSE
and the no execute bit would not hurt. So this patch modifies
the boot cpu path to execute all of the kernels enable code
if and only if we have the proper bits set in mmu_cr4_features.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Ian Campbell <ijc@hellion.org.uk> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Mika Penttilä <mika.penttila@kolumbus.fi> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Ian Campbell [Wed, 30 Jan 2008 12:33:27 +0000 (13:33 +0100)]
x86_32: remove unnecessary use of %ebx as the boot cpu flag
Currently in head_32.S there are two ways we test to see if we
are the boot cpu. By looking at %ebx and by looking at the
static variable ready. When changing things around I have
found that it gets tricky to preserve %ebx. So this
patch just switches head.S over to the more reliable
test of always using ready.
Hopefully later we can kill these tests entirely.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Ian Campbell <ijc@hellion.org.uk> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Mika Penttilä <mika.penttila@kolumbus.fi> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
travis@sgi.com [Wed, 30 Jan 2008 12:33:25 +0000 (13:33 +0100)]
x86: change size of node ids from u8 to s16
Change the size of node ids for X86_64 from u8 to s16 to
accomodate more than 32k nodes and allow for NUMA_NO_NODE
(-1) to be sign extended to int.
Cc: David Rientjes <rientjes@google.com> Cc: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Mike Travis <travis@sgi.com> Reviewed-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Mel Gorman [Wed, 30 Jan 2008 12:33:25 +0000 (13:33 +0100)]
x86: relax restrictions on setting CONFIG_NUMA on x86, #2
The FLATMEM memory model references a global mem_map and max_mapnr. This
is incompatible with how memory models used for NUMA view the world.
Builds fail if FLATMEM && NUMA are set on x86. This patch forbids that
combination of config items. This is consistent with x86_64
enforcements.
Mel Gorman [Wed, 30 Jan 2008 12:33:25 +0000 (13:33 +0100)]
x86: make NUMA work on 32-bit
The DISCONTIG memory model on x86 32 bit uses a remap allocator early
in boot. The objective is that portions of every node are mapped in to
the kernel virtual area (KVA) in place of ZONE_NORMAL so that node-local
allocations can be made for pgdat and mem_map structures.
With SPARSEMEM, the amount that is set aside is insufficient for all the
mem_maps to be allocated. During the boot process, it falls back to using
the bootmem allocator. This breaks assumptions that SPARSEMEM makes about
the layout of the mem_map in memory and results in a VM_BUG_ON triggering
due to pfn_to_page() returning garbage values.
This patch only enables the remap allocator for use with DISCONTIG.
Without SRAT support, a compile-error occurs because ACPI table parsing
functions are only available in x86-64. This patch also adds no-op stubs
and prints a warning message. What likely needs to be done is sharing
the table parsing functions between 32 and 64 bit if they are
compatible.
Sam Ravnborg [Wed, 30 Jan 2008 12:33:25 +0000 (13:33 +0100)]
xen: fix section usage in xen-head.S and setup.c
additional section for .init.text appending a number.
A side effect of this was a section mismatch warning because modpost did
not recognize a .init.text section named .init.text.1: WARNING:
vmlinux.o(.text.head+0x247): Section mismatch: reference to
.init.text.1:start_kernel (between 'is386' and 'check_x87')
Fix this by hardcoding the "ax" in the pushsection. Thanks to Torlaf for
reporting this.
Alan Modra provided the hint that made me able to locate the root cause of
this warning. And Mike Frysinger told me how to properly fix it using
__INIT/__FINIT.
Fix following Section mismatch warning in addition:
WARNING: vmlinux.o(.text+0x14c8): Section mismatch: reference to .init.data:vsyscall_int80_start (between 'fiddle_vdso' and 'xen_setup_features')
fiddle_vdso was only used from a __init function - so declare it __init.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Chris Wright <chrisw@sous-sol.org> Cc: WANG Cong <xiyou.wangcong@gmail.com> Cc: Toralf Förster <toralf.foerster@gmx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
export __supported_pte_mask variable as GPL symbol.
lguest is a user of it.
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Exporrt check_tsc_unstable function as GPL symbol. lguest is
a user of it.
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Ingo Molnar [Wed, 30 Jan 2008 12:33:24 +0000 (13:33 +0100)]
x86: fix up alternatives with lockdep enabled
An older binutils bug caused us to not fix up alternatives.
This problem involved mutex.c but we dont do lockdep section tricks
there anymore, so this workaround is moot. Keep the printk nevertheless,
just in case ... We can remove that later on.
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
travis@sgi.com [Wed, 30 Jan 2008 12:33:21 +0000 (13:33 +0100)]
x86: change bios_cpu_apicid to percpu data variable fixup
Change static bios_cpu_apicid array to a per_cpu data variable.
This includes using a static array used during initialization
similar to the way x86_cpu_to_apicid[] is handled.
There is one early use of bios_cpu_apicid in apic_is_clustered_box().
The other reference in cpu_present_to_apicid() is called after
smp_set_apicids() has setup the percpu version of bios_cpu_apicid.
Signed-off-by: Mike Travis <travis@sgi.com> Reviewed-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
travis@sgi.com [Wed, 30 Jan 2008 12:33:21 +0000 (13:33 +0100)]
x86: change NR_CPUS arrays in numa_64 fixup
Change the following static arrays sized by NR_CPUS to
per_cpu data variables:
char cpu_to_node_map[NR_CPUS];
fixup:
- Split cpu_to_node function into "early" and "late" versions
so that x86_cpu_to_node_map_early_ptr is not EXPORT'ed and
the cpu_to_node inline function is more streamlined.
- This also involves setting up the percpu maps as early as possible.
- Fix X86_32 NUMA build errors that previous version of this
patch caused.
V2->V3:
- add early_cpu_to_node function to keep cpu_to_node efficient
- move and rename smp_set_apicids() to setup_percpu_maps()
- call setup_percpu_maps() as early as possible
Andi Kleen [Wed, 30 Jan 2008 12:33:21 +0000 (13:33 +0100)]
x86: add generic clearcpuid=... option
Add a generic option to clear any cpuid bit. I added it because it was
very easy to add with the new generic cpuid disable bitmap and perhaps
it will be useful in the future.
Andi Kleen [Wed, 30 Jan 2008 12:33:20 +0000 (13:33 +0100)]
x86: don't disable RDTSC in userland for 32bit notsc
Modern 32bit userland doesn't even boot when the TSC is disabled
because ld.so tends to contain RDTSCs. So make notsc only effective for the
kernel, similar to 64bit.
Andi Kleen [Wed, 30 Jan 2008 12:33:20 +0000 (13:33 +0100)]
x86: add framework to disable CPUID bits on the command line
There are already various options to disable specific cpuid bits
on the command line. They all use their own variable. Add a generic
mask to make this easier in the future.
Eduardo Habkost [Wed, 30 Jan 2008 12:33:20 +0000 (13:33 +0100)]
x86: don't set pagetable_setup_{start,done} hooks on 64-bit
paravirt_pagetable_setup_{start,done}() are not used (yet) under x86_64,
and native_pagetable_setup_{start,done}() don't exist on x86_64. So they
don't need to be set.
__pmd, pmd_val and set_pud are used before they are defined (as static)
We move them a little up in the file, so it doesn't happen.
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This patch adds the __parainstructions section to vmlinux.lds.S.
It's needed for the patching system.
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This patch adds the constant PARAVIRT needs in asm_offsets_64.c
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This patch fills in the read and write cr8 fields with their
native version.
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Since the cr8 manipulation functions ended up staying in the tree,
they can't be defined just when PARAVIRT is off: In this patch,
those functions are defined for the PARAVIRT case too.
[ mingo@elte.hu: fixes ]
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This patch adds room for read and write_cr8 functions back in
pv_cpu_ops struct
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
With PARAVIRT, we actually have arch_{dup,exit}_mmap functions,
so we can't include the generic header
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
x86_64 lacks a native_init_IRQ() function, so we turn the arch's
init_IRQ() function into a native construct
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
We use a __stringify construction at paravirt_patch_64.c.
It's better practice to include the stringify header directly
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Yinghai Lu [Wed, 30 Jan 2008 12:33:18 +0000 (13:33 +0100)]
x86: only call early_init_amd one time
Andi's patch
"
x86: move X86_FEATURE_CONSTANT_TSC into early cpu feature detection
Need this in the next patch in time_init and that happens early.
This includes a minor fix on i386 where early_intel_workarounds()
[which is now called early_init_intel] really executes early as
the comments say.
"
calling early_init_amd in early_identify_cpu and identify_cpu two times.
this patch remove the one in identify_cpu
Signed-off-by: Yinghai Lu <yinghai.lu@sun.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Jesse Barnes [Wed, 30 Jan 2008 12:33:18 +0000 (13:33 +0100)]
x86, 32-bit: trim memory not covered by wb mtrrs
On some machines, buggy BIOSes don't properly setup WB MTRRs to cover all
available RAM, meaning the last few megs (or even gigs) of memory will be
marked uncached. Since Linux tends to allocate from high memory addresses
first, this causes the machine to be unusably slow as soon as the kernel
starts really using memory (i.e. right around init time).
This patch works around the problem by scanning the MTRRs at boot and
figuring out whether the current end_pfn value (setup by early e820 code)
goes beyond the highest WB MTRR range, and if so, trimming it to match. A
fairly obnoxious KERN_WARNING is printed too, letting the user know that
not all of their memory is available due to a likely BIOS bug.
Something similar could be done on i386 if needed, but the boot ordering
would be slightly different, since the MTRR code on i386 depends on the
boot_cpu_data structure being setup.
This patch fixes a bug in the last patch that caused the code to run on
non-Intel machines (AMD machines apparently don't need it and it's untested
on other non-Intel machines, so best keep it off).
Further enhancements and fixes from:
Yinghai Lu <Yinghai.Lu@Sun.COM>
Andi Kleen <ak@suse.de>
Signed-off-by: Jesse Barnes <jesse.barnes@intel.com> Tested-by: Justin Piszcz <jpiszcz@lucidpixels.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This makes it easier to pinpoint bugs to specific libraries.
And printing the offset into a mapping also always allows to find the
correct fault point in a library even with randomized mappings. Previously
there was no way to actually find the correct code address inside
the randomized mapping.
Relies on earlier patch to shorten the printk formats.
They are often now longer than 80 characters, but I think that's worth it.
[includes fix from Eric Dumazet to check d_path error value]
Andi Kleen [Wed, 30 Jan 2008 12:33:17 +0000 (13:33 +0100)]
x86: don't disable the APIC if it hasn't been mapped yet
When the kernel panics early for some unrelated reason
there would be eventually an early exception inside panic because
clear_local_APIC tried to disable the not yet mapped APIC.
Check for that explicitely.
Andi Kleen [Wed, 30 Jan 2008 12:33:17 +0000 (13:33 +0100)]
x86: optimize lock prefix switching to run less frequently
On VMs implemented using JITs that cache translated code changing the lock
prefixes is a quite costly operation that forces the JIT to throw away and
retranslate a lot of code.
Previously a SMP kernel would rewrite the locks once for each CPU which
is quite unnecessary. This patch changes the code to never switch at boot in
the normal case (SMP kernel booting with >1 CPU) or only once for SMP kernel
on UP.
This makes a significant difference in boot up performance on AMD SimNow!
Also I expect it to be a little faster on native systems too because a smp
switch does a lot of text_poke()s which each synchronize the pipeline.
v1->v2: Rename max_cpus
v1->v2: Fix off by one in UP check (Thomas Gleixner)
Andi Kleen [Wed, 30 Jan 2008 12:33:17 +0000 (13:33 +0100)]
x86: replace hard coded reservations in 64-bit early boot code with dynamic table
On x86-64 there are several memory allocations before bootmem. To avoid
them stomping on each other they used to be all hard coded in bad_area().
Replace this with an array that is filled as needed.
This cleans up the code considerably and allows to expand its use.
Andi Kleen [Wed, 30 Jan 2008 12:33:16 +0000 (13:33 +0100)]
x86: use the correct cpuid method to detect MWAIT support for C states
Previously there was a AMD specific quirk to handle the case of
AMD Fam10h MWAIT not supporting any C states. But it turns out
that CPUID already has ways to detectly detect that without
using special quirks.
The new code simply checks if MWAIT supports at least C1 and doesn't
use it if it doesn't. No more vendor specific code.
Note this is does not simply clear MWAIT because MWAIT can be still
useful even without C states.
Credit goes to Ben Serebrin for pointing out the (nearly) obvious.
Harvey Harrison [Wed, 30 Jan 2008 12:33:16 +0000 (13:33 +0100)]
x86: clean up ptrace.h
Leave definition of pt_regs in its own section, move all kernel
code to section afterwards, unify prototype definitions, has some
conditional prototypes to make it clear what was only defined in
32 and 64 bit.
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Dmitri Vorobiev [Wed, 30 Jan 2008 12:33:16 +0000 (13:33 +0100)]
x86_32: remove the useless NR_syscalls macro
This is against current x86.git.
The size of the system call table for 32-bit x86 kernels is obtained by
compile-time calculation of the sys_call_table array, not from the value,
which the NR_syscalls macro expands to. This trivial patch removes the
fossil macro.
Manually tested by grepping the x86 files for the "NR_syscalls" string.
No relevant use cases found.
Build-tested using allyesconfig, allnoconfig and a couple of randconfig
instances. All builds successfully finished.
Runtime test performed using a stripped-down Debian-ish config. The system
booted successfully.
Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
PSE, PGE, XMM, XMM2, and FXSR are defined as required features, and
will be optimized to a constant at compile time. Remove their redundant
definitions.
Remove duplicate set_pte* operations. PAE still needs to have special
variants of some of these because it can't atomically update a 64-bit
pte, so there's still some duplication.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
projects / linux-2.6 / log