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This array is read-only. Make it explicit by marking as const.
Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Link: http://lkml.kernel.org/r/1309482653-23648-1-git-send-email-Gregory.Dietsche@cuw.edu
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Signed-off-by: Joe Perches <joe@perches.com>
Cc: Jiri Kosina <trivial@kernel.org>
Link: http://lkml.kernel.org/r/10e35243fda0b8739c89ac32a7bdf348ec4752e1.1306603968.git.joe@perches.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
x86: Fix write lock scalability 64-bit issue
x86: Unify rwsem assembly implementation
x86: Unify rwlock assembly implementation
x86, asm: Fix binutils 2.16 issue with __USER32_CS
x86, asm: Cleanup thunk_64.S
x86, asm: Flip RESTORE_ARGS arguments logic
x86, asm: Flip SAVE_ARGS arguments logic
x86, asm: Thin down SAVE/RESTORE_* asm macros
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With the write lock path simply subtracting RW_LOCK_BIAS there
is, on large systems, the theoretical possibility of overflowing
the 32-bit value that was used so far (namely if 128 or more
CPUs manage to do the subtraction, but don't get to do the
inverse addition in the failure path quickly enough).
A first measure is to modify RW_LOCK_BIAS itself - with the new
value chosen, it is good for up to 2048 CPUs each allowed to
nest over 2048 times on the read path without causing an issue.
Quite possibly it would even be sufficient to adjust the bias a
little further, assuming that allowing for significantly less
nesting would suffice.
However, as the original value chosen allowed for even more
nesting levels, to support more than 2048 CPUs (possible
currently only for 64-bit kernels) the lock itself gets widened
to 64 bits.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/4E258E0D020000780004E3F0@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Rather than having two functionally identical implementations
for 32- and 64-bit configurations, use the previously extended
assembly abstractions to fold the rwsem two implementations into
a shared one.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/4E258DF3020000780004E3ED@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Rather than having two functionally identical implementations
for 32- and 64-bit configurations, extend the existing assembly
abstractions enough to fold the two rwlock implementations into
a shared one.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/4E258DD7020000780004E3EA@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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While testing the patchset at
http://lkml.kernel.org/r/1306873314-32523-1-git-send-email-bp@alien8.de
with binutils 2.16.1 from hell, kernel build fails with the following
error:
arch/x86/ia32/ia32entry.S: Assembler messages:
arch/x86/ia32/ia32entry.S:139: Error: too many positional arguments
make[2]: *** [arch/x86/ia32/ia32entry.o] Error 1
make[1]: *** [arch/x86/ia32] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [arch/x86] Error 2
make: *** Waiting for unfinished jobs....
due to spaces between the operators of the __USER32_CS define. Fix it so
that gas 2.16 can swallow it too.
Signed-off-by: Borislav Petkov <bp@alien8.de>
Link: http://lkml.kernel.org/r/1307131642-32595-1-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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Drop thunk_ra macro in favor of an additional argument to the thunk
macro since their bodies are almost identical. Do a whitespace scrubbing
and use CFI-aware macros for full annotation.
Signed-off-by: Borislav Petkov <bp@alien8.de>
Link: http://lkml.kernel.org/r/1306873314-32523-5-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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... thus getting rid of the "else" part of the conditional statement in
the macro.
No functionality change.
Signed-off-by: Borislav Petkov <bp@alien8.de>
Link: http://lkml.kernel.org/r/1306873314-32523-4-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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This saves us the else part of the conditional statement in the macro.
No functionality change.
Signed-off-by: Borislav Petkov <bp@alien8.de>
Link: http://lkml.kernel.org/r/1306873314-32523-3-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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Use dwarf2 cfi annotation macros, making SAVE/RESTORE_* marginally more
readable.
No functionality change.
Signed-off-by: Borislav Petkov <bp@alien8.de>
Link: http://lkml.kernel.org/r/1306873314-32523-2-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
x86, ioapic: Print IR_IO_APIC_route_entry when IR is enabled
x86, ioapic: Print IRTE when IR is enabled
x86, x2apic: Preserve high 32-bits of IA32_APIC_BASE MSR
x86, ioapic: Also print Dest field
x86, ioapic: Format clean up for IOAPIC output
x86: print APIC data a little later during boot
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When IR (interrupt remapping) is enabled print_IO_APIC() displays output according
to legacy RTE (redirection table entry) definitons:
NR Dst Mask Trig IRR Pol Stat Dmod Deli Vect:
00 00 1 0 0 0 0 0 0 00
01 00 0 0 0 0 0 0 0 01
02 00 0 0 0 0 0 0 0 02
03 00 1 0 0 0 0 0 0 03
04 00 1 0 0 0 0 0 0 04
05 00 1 0 0 0 0 0 0 05
06 00 1 0 0 0 0 0 0 06
...
The above output is as per Sec 3.2.4 of the IOAPIC datasheet:
82093AA I/O Advanced Programmable Interrupt Controller (IOAPIC):
http://download.intel.com/design/chipsets/datashts/29056601.pdf
Instead the output should display the fields as discussed in Sec 5.5.1
of the VT-d specification:
(Intel Virtualization Technology for Directed I/O:
http://download.intel.com/technology/computing/vptech/Intel(r)_VT_for_Direct_IO.pdf)
After the fix:
NR Indx Fmt Mask Trig IRR Pol Stat Indx2 Zero Vect:
00 0000 0 1 0 0 0 0 0 0 00
01 000F 1 0 0 0 0 0 0 0 01
02 0001 1 0 0 0 0 0 0 0 02
03 0002 1 1 0 0 0 0 0 0 03
04 0011 1 1 0 0 0 0 0 0 04
05 0004 1 1 0 0 0 0 0 0 05
06 0005 1 1 0 0 0 0 0 0 06
...
Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Link: http://lkml.kernel.org/r/20110712211658.2939.93123.sendpatchset@nchumbalkar.americas.cpqcorp.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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When "apic=debug" is used as a boot parameter, Linux prints the IOAPIC routing
entries in "dmesg". Below is output from IOAPIC whose apic_id is 8:
# dmesg | grep "routing entry"
IOAPIC[8]: Set routing entry (8-1 -> 0x31 -> IRQ 1 Mode:0 Active:0 Dest:0)
IOAPIC[8]: Set routing entry (8-2 -> 0x30 -> IRQ 0 Mode:0 Active:0 Dest:0)
IOAPIC[8]: Set routing entry (8-3 -> 0x33 -> IRQ 3 Mode:0 Active:0 Dest:0)
...
Similarly, when IR (interrupt remapping) is enabled, and the IRTE
(interrupt remapping table entry) is set up we should display it.
After the fix:
# dmesg | grep IRTE
IOAPIC[8]: Set IRTE entry (P:1 FPD:0 Dst_Mode:0 Redir_hint:1 Trig_Mode:0 Dlvry_Mode:0 Avail:0 Vector:31 Dest:00000000 SID:00F1 SQ:0 SVT:1)
IOAPIC[8]: Set IRTE entry (P:1 FPD:0 Dst_Mode:0 Redir_hint:1 Trig_Mode:0 Dlvry_Mode:0 Avail:0 Vector:30 Dest:00000000 SID:00F1 SQ:0 SVT:1)
IOAPIC[8]: Set IRTE entry (P:1 FPD:0 Dst_Mode:0 Redir_hint:1 Trig_Mode:0 Dlvry_Mode:0 Avail:0 Vector:33 Dest:00000000 SID:00F1 SQ:0 SVT:1)
...
The IRTE is defined in Sec 9.5 of the Intel VT-d Specification.
Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Link: http://lkml.kernel.org/r/20110712211704.2939.71291.sendpatchset@nchumbalkar.americas.cpqcorp.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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If there's no special reason to zero-out the "high" 32-bits of the IA32_APIC_BASE
MSR, let's preserve it.
The x2APIC Specification doesn't explicitly state any such requirement. (Sec 2.2
in: http://www.intel.com/Assets/PDF/manual/318148.pdf).
Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Link: http://lkml.kernel.org/r/20110712055831.2498.78521.sendpatchset@nchumbalkar.americas.cpqcorp.net
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Reviewed-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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The code in setup_ioapic_irq() determines the Destination Field,
so why not also include it in the debug printk output that gets
displayed when the boot parameter "apic=debug" is used.
Before the change, "dmesg" will show:
IOAPIC[0]: Set routing entry (8-1 -> 0x31 -> IRQ 1 Mode:0 Active:0)
IOAPIC[0]: Set routing entry (8-2 -> 0x30 -> IRQ 0 Mode:0 Active:0)
IOAPIC[0]: Set routing entry (8-3 -> 0x33 -> IRQ 3 Mode:0 Active:0) ...
After the change, you will see:
IOAPIC[0]: Set routing entry (8-1 -> 0x31 -> IRQ 1 Mode:0 Active:0 Dest:0)
IOAPIC[0]: Set routing entry (8-2 -> 0x30 -> IRQ 0 Mode:0 Active:0 Dest:0)
IOAPIC[0]: Set routing entry (8-3 -> 0x33 -> IRQ 3 Mode:0 Active:0 Dest:0) ...
Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Link: http://lkml.kernel.org/r/20110708184603.2734.91071.sendpatchset@nchumbalkar.americas.cpqcorp.net
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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When IOAPIC data is displayed in "dmesg" with the help of the
boot parameter "apic=debug" certain values are not formatted
correctly wrt their size.
In the "dmesg" snippet below, note that the output for "max
redirection entries", and "IO APIC version" which are each
defined to be just 8-bits long are displayed as 2 bytes in
length. Similarly, "Dst" under the "IRQ redirection table"
should only be 8-bits long.
IO APIC #0......
...
...
.... register #01: 00170020
....... : max redirection entries: 0017
....... : PRQ implemented: 0
....... : IO APIC version: 0020
...
...
.... IRQ redirection table:
NR Dst Mask Trig IRR Pol Stat Dmod Deli Vect:
00 000 1 0 0 0 0 0 0 00
01 000 0 0 0 0 0 0 0 31
02 000 0 0 0 0 0 0 0 30
03 000 1 0 0 0 0 0 0 33
...
...
Do some formatting clean up, so you will see output like below:
IO APIC #0......
...
...
.... register #01: 00170020
....... : max redirection entries: 17
....... : PRQ implemented: 0
....... : IO APIC version: 20
...
...
.... IRQ redirection table:
NR Dst Mask Trig IRR Pol Stat Dmod Deli Vect:
00 00 1 0 0 0 0 0 0 00
01 00 0 0 0 0 0 0 0 31
02 00 0 0 0 0 0 0 0 30
03 00 1 0 0 0 0 0 0 33
...
...
Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Link: http://lkml.kernel.org/r/20110708184557.2734.61830.sendpatchset@nchumbalkar.americas.cpqcorp.net
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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To view IOAPIC data you could boot with "apic=debug".
When booting in such a way then the kernel will dump the
IO-APIC's registers, for example:
NR Dst Mask Trig IRR Pol Stat Dmod Deli Vect:
00 000 1 0 0 0 0 0 0 00
01 000 0 0 0 0 0 0 0 31
02 000 0 0 0 0 0 0 0 30
03 000 0 0 0 0 0 0 0 33
04 000 0 0 0 0 0 0 0 34
05 000 0 0 0 0 0 0 0 35
06 000 0 0 0 0 0 0 0 36
07 000 0 0 0 0 0 0 0 37
08 000 0 0 0 0 0 0 0 38
09 000 0 1 0 0 0 0 0 39
0a 000 0 0 0 0 0 0 0 3A
0b 000 0 0 0 0 0 0 0 3B
0c 000 0 0 0 0 0 0 0 3C
0d 000 0 0 0 0 0 0 0 3D
0e 000 0 0 0 0 0 0 0 3E
0f 000 0 0 0 0 0 0 0 3F
10 000 1 0 0 0 0 0 0 00
11 000 1 0 0 0 0 0 0 00
12 000 1 0 0 0 0 0 0 00
13 000 1 0 0 0 0 0 0 00
14 000 1 0 0 0 0 0 0 00
15 000 1 0 0 0 0 0 0 00
16 000 1 0 0 0 0 0 0 00
17 000 1 0 0 0 0 0 0 00
Delaying the call to print_ICs() gives better results:
NR Dst Mask Trig IRR Pol Stat Dmod Deli Vect:
00 000 1 0 0 0 0 0 0 00
01 000 0 0 0 0 0 0 0 31
02 000 0 0 0 0 0 0 0 30
03 000 1 0 0 0 0 0 0 33
04 000 1 0 0 0 0 0 0 34
05 000 1 0 0 0 0 0 0 35
06 000 1 0 0 0 0 0 0 36
07 000 1 0 0 0 0 0 0 37
08 000 0 0 0 0 0 0 0 38
09 000 0 1 0 0 0 0 0 39
0a 000 1 0 0 0 0 0 0 3A
0b 000 1 0 0 0 0 0 0 3B
0c 000 0 0 0 0 0 0 0 3C
0d 000 1 0 0 0 0 0 0 3D
0e 000 1 0 0 0 0 0 0 3E
0f 000 1 0 0 0 0 0 0 3F
10 000 1 1 0 1 0 0 0 29
11 000 1 0 0 0 0 0 0 00
12 000 1 0 0 0 0 0 0 00
13 000 1 0 0 0 0 0 0 00
14 000 0 1 0 1 0 0 0 51
15 000 1 0 0 0 0 0 0 00
16 000 0 1 0 1 0 0 0 61
17 000 0 1 0 1 0 0 0 59
Notice that the entries beyond interrupt input signal 0x0f also
get populated and arent just the hw-initialization default of
all zeroes.
Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Link: http://lkml.kernel.org/r/20110708083555.2598.42216.sendpatchset@nchumbalkar.americas.hpqcorp.net
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'timers-rtc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
x86: Serialize EFI time accesses on rtc_lock
x86: Serialize SMP bootup CMOS accesses on rtc_lock
rtc: stmp3xxx: Remove UIE handlers
rtc: stmp3xxx: Get rid of mach-specific accessors
rtc: stmp3xxx: Initialize drvdata before registering device
rtc: stmp3xxx: Port stmp-functions to mxs-equivalents
rtc: stmp3xxx: Restore register definitions
rtc: vt8500: Use define instead of hardcoded value for status bit
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The EFI specification requires that callers of the time related
runtime functions serialize with other CMOS accesses in the
kernel, as the EFI time functions may choose to also use the
legacy CMOS RTC.
Besides fixing a latent bug, this is a prerequisite to safely
enable the rtc-efi driver for x86, which ought to be preferred
over rtc-cmos on all EFI platforms.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Acked-by: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: <mjg@redhat.com>
Link: http://lkml.kernel.org/r/4E257E33020000780004E319@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Matthew Garrett <mjg@redhat.com>
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With CPU hotplug, there is a theoretical race between other CMOS
(namely RTC) accesses and those done in the SMP secondary
processor bringup path.
I am unware of the problem having been noticed by anyone in practice,
but it would very likely be rather spurious and very hard to reproduce.
So to be on the safe side, acquire rtc_lock around those accesses.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/4E257AE7020000780004E2FF@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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The RTC core handles UIE since 6610e08 (RTC: Rework RTC code to use
timerqueue for events), so remove the specific interrupt in this driver.
To make it work at all, enable interrupts in set_alarm() if needed. Drop
IRQF_DISABLED which is deprecated, while we are here. Finally, add my
copyright after all these changes.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Tested-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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Replace the accessors with standard readl/writel to remove their
platform-dependency. Also, drop __raw_(read|write)l-accessors while we
are here.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Tested-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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Commit f44f7f96a20 ("RTC: Initialize kernel state from RTC") uncovered
an issue in a number of RTC drivers, where the drivers call
rtc_device_register before initializing the device or platform drvdata.
This frequently results in null pointer dereferences when the
rtc_device_register immediately makes use of the rtc device, calling
rtc_read_alarm.
The solution is to ensure the drvdata is initialized prior to registering
the rtc device.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Tested-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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The stmp3xxx driver used to include functions from a stmp-specific
include. Because of consolidation, plat-stmp has now been removed and
merged with the compatible mach-mxs.
Use the apropriate mxs-functions for transition. The accessors will be
converted to readl/writel in a later patch.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Tested-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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The stmp3xxx driver used to include register names from a stmp-specific
include. Because of consolidation, plat-stmp has now been removed and
merged with the compatible mach-mxs. Restore the register names directly
in the driver and rename them to be specific to this driver.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Tested-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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Fixes the vt8500 driver to use a define value for the isr
is-alarm bit.
Cc: Alexey Charkov <alchark@gmail.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
time: Fix stupid KERN_WARN compile issue
rtc: Avoid accumulating time drift in suspend/resume
time: Avoid accumulating time drift in suspend/resume
time: Catch invalid timespec sleep values in __timekeeping_inject_sleeptime
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Terribly embarassing. Don't know how I committed this, but its
KERN_WARNING not KERN_WARN.
This fixes the following compile error:
kernel/time/timekeeping.c: In function ‘__timekeeping_inject_sleeptime’:
kernel/time/timekeeping.c:608: error: ‘KERN_WARN’ undeclared (first use in this function)
kernel/time/timekeeping.c:608: error: (Each undeclared identifier is reported only once
kernel/time/timekeeping.c:608: error: for each function it appears in.)
kernel/time/timekeeping.c:608: error: expected ‘)’ before string constant
make[2]: *** [kernel/time/timekeeping.o] Error 1
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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Because the RTC interface is only a second granular interface,
each time we read from the RTC for suspend/resume, we introduce a
half second (on average) of error.
In order to avoid this error accumulating as the system is suspended
over and over, this patch measures the time delta between the RTC
and the system CLOCK_REALTIME.
If the delta is less then 2 seconds from the last suspend, we compensate
by using the previous time delta (keeping it close). If it is larger
then 2 seconds, we assume the clock was set or has been changed, so we
do no correction and update the delta.
Note: If NTP is running, ths could seem to "fight" with the NTP corrected
time, where as if the system time was off by 1 second, and NTP slewed the
value in, a suspend/resume cycle could undo this correction, by trying to
restore the previous offset from the RTC. However, without this patch,
since each read could cause almost a full second worth of error, its
possible to get almost 2 seconds of error just from the suspend/resume
cycle alone, so this about equal to any offset added by the compensation.
Further on systems that suspend/resume frequently, this should keep time
closer then NTP could compensate for if the errors were allowed to
accumulate.
Credits to Arve Hjønnevåg for suggesting this solution.
This patch also improves some of the variable names and adds more clear
comments.
CC: Arve Hjønnevåg <arve@android.com>
CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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Because the read_persistent_clock interface is usually backed by
only a second granular interface, each time we read from the persistent
clock for suspend/resume, we introduce a half second (on average) of error.
In order to avoid this error accumulating as the system is suspended
over and over, this patch measures the time delta between the persistent
clock and the system CLOCK_REALTIME.
If the delta is less then 2 seconds from the last suspend, we compensate
by using the previous time delta (keeping it close). If it is larger
then 2 seconds, we assume the clock was set or has been changed, so we
do no correction and update the delta.
Note: If NTP is running, ths could seem to "fight" with the NTP corrected
time, where as if the system time was off by 1 second, and NTP slewed the
value in, a suspend/resume cycle could undo this correction, by trying to
restore the previous offset from the persistent clock. However, without
this patch, since each read could cause almost a full second worth of
error, its possible to get almost 2 seconds of error just from the
suspend/resume cycle alone, so this about equal to any offset added by
the compensation.
Further on systems that suspend/resume frequently, this should keep time
closer then NTP could compensate for if the errors were allowed to
accumulate.
Credits to Arve Hjønnevåg for suggesting this solution.
CC: Arve Hjønnevåg <arve@android.com>
CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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Arve suggested making sure we catch possible negative sleep time
intervals that could be passed into timekeeping_inject_sleeptime.
CC: Arve Hjønnevåg <arve@android.com>
CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'timers-cleanup-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
mips: Fix i8253 clockevent fallout
i8253: Cleanup outb/inb magic
arm: Footbridge: Use common i8253 clockevent
mips: Use common i8253 clockevent
x86: Use common i8253 clockevent
i8253: Create common clockevent implementation
i8253: Export i8253_lock unconditionally
pcpskr: MIPS: Make config dependencies finer grained
pcspkr: Cleanup Kconfig dependencies
i8253: Move remaining content and delete asm/i8253.h
i8253: Consolidate definitions of PIT_LATCH
x86: i8253: Consolidate definitions of global_clock_event
i8253: Alpha, PowerPC: Remove unused asm/8253pit.h
alpha: i8253: Cleanup remaining users of i8253pit.h
i8253: Remove I8253_LOCK config
i8253: Make pcsp sound driver use the shared i8253_lock
i8253: Make pcspkr input driver use the shared i8253_lock
i8253: Consolidate all kernel definitions of i8253_lock
i8253: Unify all kernel declarations of i8253_lock
i8253: Create linux/i8253.h and use it in all 8253 related files
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pit_clockevent wants to replaced in the argument of the callback
function as well.
Reported-by; Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Remove the hysterical outb/inb_pit defines and use outb_p/inb_p in the
code.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20110609130622.348437125@linutronix.de
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20110609130622.241312122@linutronix.de
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20110609130622.133068765@linutronix.de
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20110609130622.026152527@linutronix.de
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arm, mips and x86 implement i8253 based clockevents. All the same code
copied. Create a common implementation in drivers/clocksource/i8253.c.
About time to rename drivers/clocksource/ to something else.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20110609130621.921710458@linutronix.de
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We don't want to add endless selects and module ifdefs.
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Only the Siemens-Nixdorf RM series workstations and the Jazz family
workstations have PC speakers built in; Malta can connect one via the
infamous AMR connector with an AMR sound card or a little creativity.
So we don't want to offer the PC speaker driver on all MIPS systems.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Link: http://lkml.kernel.org/r/20110601180611.061710714@duck.linux-mips.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Lenghty lists of the kind "depends on ARCH1 || ARCH2 ... || ARCH123" are
usually either wrong or too coarse grained. Or plain an ugly sin.
[ tglx: Fixed up amigaone ]
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linux-alpha@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Gerhard Pircher <gerhard_pircher@gmx.net>
Link: http://lkml.kernel.org/r/20110601180610.984881988@duck.linux-mips.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Move setup_pit_timer() declaration to the common header file and
remove the arch specific ones.
[ tglx: Move it to linux/i8253.h instead of asm/mips and asm/x86 ]
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Russell King <linux@arm.linux.org.uk>
Cc: linux-mips@linux-mips.org
Cc: Sergei Shtylyov <sshtylyov@mvista.com
Link: http://lkml.kernel.org/r/20110601180610.913463093@duck.linux-mips.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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x86 defines PIT_LATCH as LATCH which in <linux/timex.h> is defined as
((CLOCK_TICK_RATE + HZ/2) / HZ) and <asm/timex.h> again defines
CLOCK_TICK_RATE as PIT_TICK_RATE.
MIPS defines PIT_LATCH as LATCH which in <linux/timex.h> is defined as
((CLOCK_TICK_RATE + HZ/2) / HZ) and <asm/timex.h> again defines
CLOCK_TICK_RATE as 1193182.
ARM defines PITCH_LATCH as ((PIT_TICK_RATE + HZ / 2) / HZ) - and that's
the sanest thing and equivalent to above definitions so use that as the
new definition in <linux/i8253.h>.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mips@linux-mips.org
Link: http://lkml.kernel.org/r/20110601180610.832810002@duck.linux-mips.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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There are multiple declarations of global_clock_event in header files
specific to particular clock event implementations. Consolidate them
in <asm/time.h> and make sure all users include that header.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Venkatesh Pallipadi (Venki) <venki@google.com>
Link: http://lkml.kernel.org/r/20110601180610.762763451@duck.linux-mips.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/20110601180610.684557757@duck.linux-mips.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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The Alpha <asm/i8253pit.h> header is empty so this inclusion can just be
removed.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Link: http://lkml.kernel.org/r/20110601180610.608083130@duck.linux-mips.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Now that all extra ifdeffed implementations are gone, depend the lock
export on PCSPKR_PLATFORM
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Russell King <linux@arm.linux.org.uk>
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Jaroslav Kysela <perex@perex.cz>
Acked-by: Takashi Iwai <tiwai@suse.de>
Cc: alsa-devel@alsa-project.org
Link: http://lkml.kernel.org/r/20110601180610.532642190@duck.linux-mips.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Link: http://lkml.kernel.org/r/20110601180610.453577265@duck.linux-mips.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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