07 May, 2010
1 commit
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Reimplement stop_machine using cpu_stop. As cpu stoppers are
guaranteed to be available for all online cpus,
stop_machine_create/destroy() are no longer necessary and removed.With resource management and synchronization handled by cpu_stop, the
new implementation is much simpler. Asking the cpu_stop to execute
the stop_cpu() state machine on all online cpus with cpu hotplug
disabled is enough.stop_machine itself doesn't need to manage any global resources
anymore, so all per-instance information is rolled into struct
stop_machine_data and the mutex and all static data variables are
removed.The previous implementation created and destroyed RT workqueues as
necessary which made stop_machine() calls highly expensive on very
large machines. According to Dimitri Sivanich, preventing the dynamic
creation/destruction makes booting faster more than twice on very
large machines. cpu_stop resources are preallocated for all online
cpus and should have the same effect.Signed-off-by: Tejun Heo
Acked-by: Rusty Russell
Acked-by: Peter Zijlstra
Cc: Oleg Nesterov
Cc: Dimitri Sivanich
13 Apr, 2010
39 commits
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Suggested by Peter Zijlstra
Signed-off-by: David S. Miller
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Conflicts:
lib/Kconfig.debug -
Found by kmemleak.
If request_resource() fails, we leak the struct resource we
allocated to represent the IOMMU mapping area.This actually happens on sun4v machines because the IOMEM area is only
reported sans the IOMMU region, unlike all previous systems. I'll
need to fix that at some point, but for now fix the leak.Signed-off-by: David S. Miller
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The only reference we store to this memory is in the form of a
physical address, so kmemleak can't see it.Add a kmemleak_not_leak() annotation.
It's probably useful to be able to look at a dump of these things
either via debugfs or similar, and thus we could at some point store
them in some kind of table and therefore get rid of this annotation.Signed-off-by: David S. Miller
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Only missing thing was an _sdata marker in vmlinux.lds.S
Signed-off-by: David S. Miller
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Signed-off-by: David S. Miller
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It's the only way we'll be able to implement the function
graph tracer properly.A positive is that we no longer have to worry about the
linker over-optimizing the tail call, since we don't
use a tail call any more.Signed-off-by: David S. Miller
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This keeps us from having to use kstat_irqs_cpu() from the NMI handler,
the former of which is a profiled function.Instead we use a currently empty slot in the cpu_data
Signed-off-by: David S. Miller
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These include the timer implementation, perf events support, and the
performance counter register (pcr) programming layer.Signed-off-by: David S. Miller
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Signed-off-by: David S. Miller
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The generic stack tracer does this job just as well.
Signed-off-by: David S. Miller
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Check function_trace_stop at ftrace_caller
Toss mcount_call and dummy call of ftrace_stub, unnecessary.
Document problems we'll have if the final kernel image link
ever turns on relaxation.Properly size 'ftrace_call' so it looks right when inspecting
instructions under gdb et al.Signed-off-by: David S. Miller
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If we are in an NMI then doing a plain raw_local_irq_disable() will
write PIL_NORMAL_MAX into %pil, which is lower than PIL_NMI, and thus
we'll re-enable NMIs and recurse.Doing a simple:
%pil = %pil | PIL_NORMAL_MAX
does what we want, if we're already at PIL_NMI (15) we leave it at
that setting, else we set it to PIL_NORMAL_MAX (14).This should get the function tracer working on sparc64.
Signed-off-by: David S. Miller
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This gets rid of a local function (is_kernel_stack()) which tries to
do the same thing, yet poorly in that it doesn't handle IRQ stacks
properly.Signed-off-by: David S. Miller
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* master.kernel.org:/home/rmk/linux-2.6-arm: (21 commits)
ARM: Fix ioremap_cached()/ioremap_wc() for SMP platforms
ARM: 6043/1: AT91 slow-clock resume: Don't wait for a disabled PLL to lock
ARM: 6031/1: fix Thumb-2 decompressor
ARM: 6029/1: ep93xx: gpio.c: local functions should be static
ARM: 6028/1: ARM: add MAINTAINERS for U300
ARM: 6024/1: bcmring: fix missing down on semaphore in dma.c
MXC: mach_armadillo5x0: Add USB Host support.
ARM mach-mx3: duplicated include
ARM mach-mx3: duplicated include
imx31: add watchdog device on litekit board.
imx3: Add watchdog platform device support
MXC: mach-mx31_3ds: add support for freescale mc13783 power management device.
MXC: mach-mx31_3ds: Add SPI1 device support.
MXC: mach-mx31_3ds: Add support for on board NAND Flash.
MXC: mach-mx31_3ds: Update variable names over recent mach name modification.
imx31: fix parent clock for rtc
i.MX51: remove NFC AXI static mapping
i.MX51: determine silicon revision dynamically
i.MX51: map TZIC dynamically
i.MX51: Use correct clock for gpt
... -
The ebase is relative to CKSEG0 not CAC_BASE. On a 32-bit kernel they
are the same thing, for a 64-bit kernel they are not.It happens to kind of work on a 64-bit kernel as they both reference
the same physical memory. However since the CPU uses the CKSEG0 base,
determining if a J instruction will reach always gives the wrong result
unless we use the same number the CPU uses.Signed-off-by: David Daney
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1093/
Signed-off-by: Ralf Baechle -
While playing with the out-of-tree MAE driver module, the system would
panic after a while in the db1200 custom wait code after wakeup due to
a clobbered k0 register being used as target address of a store op.Remove the custom wait implementation and revert back to the Alchemy-
recommended implementation already set as default.Signed-off-by: Manuel Lauss
To: Linux-MIPS
Patchwork: http://patchwork.linux-mips.org/patch/1092/
Signed-off-by: Ralf Baechle -
Signed-off-by: Ralf Baechle
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Commit b3594a089f1c17ff919f8f78505c3f20e1f6f8ce (lmo) rsp.
351336929ccf222ae38ff0cb7a8dd5fd5c6236a0 (kernel.org) break non-GPL modules
that use __vmalloc() or any of the vmap(), vm_map_ram(), etc functions on
MIPS.All those functions are EXPORT_SYMBOL() so are meant to be allowed to be
used by non-GPL kernel modules. These calls all take page protection as
an argument which is normally a constant like PAGE_KERNEL.This commit causes all protection constants like PAGE_KERNEL to not be
constants and instead to contain the GPL-only symbol _page_cachable_default.This means that all calls to __vmalloc(), vmap(), etc, cause non-GPL
modules to fail to link with the complaint that they are trying to use the
GPL-only symbol _page_cachable_default...Change EXPORT_SYMBOL_GPL(_page_cachable_default) to EXPORT_SYMBOL() for
non-GPL modules that call __vmalloc(), vmap(), vm_map_ram() etc.Signed-off-by: Anton Altaparmakov
Cc: Chris Dearman
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: http://patchwork.linux-mips.org/patch/1084/
Signed-off-by: Ralf Baechle -
The M3 workaround needs to cmpare the region and VPN2 fields only.
Signed-off-by: Ralf Baechle
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Since 2083e8327aeeaf818b0e4522a9d2539835c60423, the SPROM is now registered
in the board_prom_init callback, but it references variables and functions
which are declared below. Move the variables and functions above
board_prom_init.Signed-off-by: Florian Fainelli
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1077/
Signed-off-by: Ralf Baechle -
This is needed for the fix of the M3 workaround.
Signed-off-by: Ralf Baechle
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Previously it was unconditionally used on all Sibyte family SOCs. The
M3 bug has to be handled in the TLB exception handler which is extremly
performance sensitive, so this modification is expected to deliver around
2-3% performance improvment. This is important as required changes to the
M3 workaround will make it more costly.Signed-off-by: Ralf Baechle
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To avoid a glitch during GPIO initialisation read GPIO output register
values left by the firmware.Signed-off-by: Maxime Bizon
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/903/
Signed-off-by: Ralf Baechle -
Signed-off-by: Florian Fainelli
To: Maxime Bizon
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1017/
Signed-off-by: Ralf Baechle -
Fix typo: CONFIG_BCMCPU_IS_63xx does not exist;
CONFIG_BCM63XX_CPU_63xx is the valid config option.Signed-off-by: Maxime Bizon
To: linux-mips@linux-mips.org
Cc: Maxime Bizon
Patchwork: http://patchwork.linux-mips.org/patch/901/
Signed-off-by: Ralf Baechle -
The BCm63xx SOC has two uarts. Some boards use the second one for
bluetooth. This patch changes platform device registration code to
handle this. Changes to the UART driver were already merged in
6a2c7eabfd09ca7986bf96b8958a87ca041a19d8.Signed-off-by: Maxime Bizon
To: linux-mips@linux-mips.org
Cc: Maxime Bizon
Patchwork: http://patchwork.linux-mips.org/patch/900/
Signed-off-by: Ralf Baechle -
bcm63xx_gpio_init is already called from prom_init to allow board to use
them early, so we can remove the unneeded arch_initcall.Signed-off-by: Maxime Bizon
To: linux-mips@linux-mips.org
Cc: Maxime Bizon
Patchwork: http://patchwork.linux-mips.org/patch/899/
Signed-off-by: Ralf Baechle -
The DWVS0 board is a BCM6358-based board with an on-board OHCI controler.
Signed-off-by: Florian Fainelli
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1015/
Signed-off-by: Ralf Baechle -
Signed-off-by: Florian Fainelli
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1014/
Signed-off-by: Ralf Baechle -
The number of GPIOs on BCM6338 is 8, while BCM6345 has only 16 GPIOs
available.Signed-off-by: Florian Fainelli
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1016/
Signed-off-by: Ralf Baechle -
arch/mips/lib/libgcc.h:21: ERROR: open brace '{' following union go on the same line
Signed-off-by: Andrea Gelmini
To: linux-kernel@vger.kernel.org
Cc: Paul Mundt
Cc: linux-mips@linux-mips.org
Cc: linux-sh@vger.kernel.org
Patchwork: http://patchwork.linux-mips.org/patch/1007/
Signed-off-by: Ralf Baechle -
As per chapter 15 "Errata: Issue of Out-of-order in loongson"[1] to work
around the Loongson 2F erratum we need to do:"When switching from user mode to kernel mode, you should flush the
branch target history such as BTB and RAS."[1] Chinese version: http://www.loongson.cn/uploadfile/file/200808211
[2] English version of chapter 15:
http://groups.google.com.hk/group/loongson-dev/msg/e0d2e220958f10a6?dmode=sourceSigned-off-by: Wu Zhangjin
Cc: linux-mips@linux-mips.org
Cc: Shinya Kuribayashi
Patchwork: http://patchwork.linux-mips.org/patch/1066/
Signed-off-by: Ralf Baechle -
This is a follow on to the vdso patch.
Since all processes now have signal trampolines permanently mapped, we
can use those instead of putting the trampoline on the stack and
invalidating the corresponding icache across all CPUs. We also get rid
of a bunch of ICACHE_REFILLS_WORKAROUND_WAR code.[Ralf: GDB 7.1 which has the necessary modifications to allow backtracing
over signal frames will supposedly be released tomorrow. The old signal
frame format obsoleted by this patch exists in two variations, for sane
processors and for those requiring ICACHE_REFILLS_WORKAROUND_WAR. So
there was never a GDB which did support backtracing over signal frames
on all MIPS systems. This convinved me this series should be applied and
pushed upstream as soon as possible.]Signed-off-by: David Daney
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/974/
Signed-off-by: Ralf Baechle -
This is a preliminary patch to add a vdso to all user processes. Still
missing are ELF headers and .eh_frame information. But it is enough to
allow us to move signal trampolines off of the stack. Note that emulation
of branch delay slots in the FPU emulator still requires the stack.We allocate a single page (the vdso) and write all possible signal
trampolines into it. The stack is moved down by one page and the vdso is
mapped into this space.Signed-off-by: David Daney
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/975/
Signed-off-by: Ralf Baechle -
Signed-off-by: David Daney
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/976/
Signed-off-by: Ralf Baechle -
On AR7, we already redefine PHYS_OFFSET to match the system specifities, it
is however not sufficient when unsing dma_{map,unmap}_single, specifically
in the ethernet driver, we must also adjust CAC_ADDR and UNCAC_ADDR for DMA
to work correctly. This patch fixes the following issue, seen in cpmac_open:ops[#1]:
Cpu 0
$ 0 : 00000000 10008400 a0f5b120 00000000
$ 4 : 94c59000 94270f64 00000020 00000010
$ 8 : 00000010 94103ce0 0000000a 94c03400
$12 : ffffffff 94c03408 94c03410 00000001
$16 : a0f5ba20 00000041 94c592c0 94c59200
$20 : 94c59000 000005ee 00002000 9438c8f0
$24 : 00000010 00000000
$28 : 94fac000 94fadd58 94390000 942724a8
Hi : 00000000
Lo : 00000001
epc : 94272518 cpmac_open+0x208/0x3f8
Not tainted
ra : 942724a8 cpmac_open+0x198/0x3f8
Status: 10008403 KERNEL EXL IE
Cause : 3080000c
BadVA : 00000000
PrId : 00018448 (MIPS 4KEc)
Modules linked in:
Process ifconfig (pid: 278, threadinfo=94fac000, task=94e79590, tls=00000000)
Stack : 7f8da120 2ab05cb0 94c59000 943356f0 00000000 943d0000 94c59000 943356f0
94c59030 943d0000 943c27c0 94fade10 00000000 94fade20 94c59000 9428e5a4
00000000 94c59000 00000041 94289768 94c59000 00000041 00001002 00001043
00000000 9428d810 00000000 94fade10 7f8da4e8 9428e6b8 00000000 7f8da4a8
7f8da4e8 00008914 00000000 942f7f2c 00000000 00000008 00408000 00008913
...
Call Trace:
[] cpmac_open+0x208/0x3f8
[] dev_open+0x164/0x264
[] dev_change_flags+0xd0/0x1bc
[] devinet_ioctl+0x2d8/0x908
[] sock_ioctl+0x29c/0x2fc
[] vfs_ioctl+0x2c/0x7c
[] do_vfs_ioctl+0x5dc/0x630
[] sys_ioctl+0x50/0x88
[] stack_done+0x20/0x3cSigned-off-by: peter fuerst
Signed-off-by: Florian Fainelli
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1050/
Signed-off-by: Ralf Baechle -
Seems I trimmed one too many lines in
29ca2d81bd2a62fa86bc9a72ddadcf03d7daf795 (lmo) rsp
7084338eb8eb0cc021ba86c340157bad397f3f0b (kernel.org) which led to no
functioning Ethernet on my WAG54Gv2. This patch restores the AWOL line.Signed-off-by: Alexander Clouter
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1065/
Signed-off-by: Ralf Baechle -
Seems in my whitespace cleanup 0f2536082d01448daeced8d9e82c3ba1751fefa3
(lmo) rsp. 8c2961da46abd85a71d20f2b169bf80618e (kernel.org) caused AR7
to no longer get as far as init. Fixed my phat fingering.Signed-off-by: Alexander Clouter
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1064/
Signed-off-by: Ralf Baechle
