28 Apr, 2008
3 commits
-
Add a new function gpiochip_reserve() to reserve ranges of gpios that platform
code has pre-allocated. That is, this marks gpio numbers which will be
claimed by drivers that haven't yet been loaded, and thus are not available
for dynamic gpio number allocation.[akpm@linux-foundation.org: remove unneeded __must_check]
[david-b@pacbell.net: don't export gpiochip_reserve (section fix)]
Signed-off-by: Anton Vorontsov
Signed-off-by: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Introduce a gpio_is_valid() predicate; use it in gpiolib.
Signed-off-by: Guennadi Liakhovetski
[ use inline function; follow the gpio_* naming convention;
work without gpiolib; all programming interfaces need docs ]
Signed-off-by: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
As long as one or more GPIOs on a gpio chip are used its driver should not be
unloaded. The existing mechanism (gpiochip_remove failure) doesn't address
that, since rmmod can no longer be made to fail by having the cleanup code
report errors. Module usecounts are the solution.Assuming standard "initialize struct to zero" policies, this change won't
affect SOC platform drivers. However, drivers for external chips (on I2C and
SPI busses) should be updated if they can be built as modules.Signed-off-by: Guennadi Liakhovetski
[ gpio_ensure_requested() needs to update module usecounts too ]
Signed-off-by: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
27 Apr, 2008
3 commits
-
Use __fls for fls64 on 64-bit archs. The implementation for
64-bit archs is moved from x86_64 to asm-generic.Signed-off-by: Alexander van Heukelum
Signed-off-by: Ingo Molnar -
Add a generic __fls implementation in the same spirit as
the generic __ffs one. It finds the last (most significant)
set bit in the given long value.Signed-off-by: Alexander van Heukelum
Signed-off-by: Ingo Molnar -
This moves an optimization for searching constant-sized small
bitmaps form x86_64-specific to generic code.On an i386 defconfig (the x86#testing one), the size of vmlinux hardly
changes with this applied. I have observed only four places where this
optimization avoids a call into find_next_bit:In the functions return_unused_surplus_pages, alloc_fresh_huge_page,
and adjust_pool_surplus, this patch avoids a call for a 1-bit bitmap.
In __next_cpu a call is avoided for a 32-bit bitmap. That's it.On x86_64, 52 locations are optimized with a minimal increase in
code size:Current #testing defconfig:
146 x bsf, 27 x find_next_*bit
text data bss dec hex filename
5392637 846592 724424 6963653 6a41c5 vmlinuxAfter removing the x86_64 specific optimization for find_next_*bit:
94 x bsf, 79 x find_next_*bit
text data bss dec hex filename
5392358 846592 724424 6963374 6a40ae vmlinuxAfter this patch (making the optimization generic):
146 x bsf, 27 x find_next_*bit
text data bss dec hex filename
5392396 846592 724424 6963412 6a40d4 vmlinux[ tglx@linutronix.de: build fixes ]
Signed-off-by: Ingo Molnar
25 Apr, 2008
1 commit
-
x86 has ioremap_wc for wc remap. Also introduce a generic ioremap_wc
aliased to ioremap_uc so that drivers can use this interface transparently.Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Suresh Siddha
Signed-off-by: Ingo Molnar
20 Apr, 2008
1 commit
-
Create a simple macro to always return a pointer to the node_to_cpumask(node)
value. This relies on compiler optimization to remove the extra indirection:#define node_to_cpumask_ptr(v, node) \
cpumask_t _##v = node_to_cpumask(node), *v = &_##vFor those systems with a large cpumask size, then a true pointer
to the array element can be used:#define node_to_cpumask_ptr(v, node) \
cpumask_t *v = &(node_to_cpumask_map[node])A node_to_cpumask_ptr_next() macro is provided to access another
node_to_cpumask value.The other change is to always include asm-generic/topology.h moving the
ifdef CONFIG_NUMA to this same file.Note: there are no references to either of these new macros in this patch,
only the definition.Based on 2.6.25-rc5-mm1
# alpha
Cc: Richard Henderson# fujitsu
Cc: David Howells# ia64
Cc: Tony Luck# powerpc
Cc: Paul Mackerras
Cc: Anton Blanchard# sparc
Cc: David S. Miller
Cc: William L. Irwin# x86
Cc: H. Peter AnvinSigned-off-by: Mike Travis
Signed-off-by: Ingo Molnar
03 Apr, 2008
1 commit
-
Currently include/linux/kvm.h is not considered by make headers_install,
because Kbuild cannot handle " unifdef-$(CONFIG_FOO) += foo.h. This problem
was introduced bycommit fb56dbb31c4738a3918db81fd24da732ce3b4ae6
Author: Avi Kivity
Date: Sun Dec 2 10:50:06 2007 +0200KVM: Export include/linux/kvm.h only if $ARCH actually supports KVM
Currently, make headers_check barfs due to , which
includes, not existing. Rather than add a zillion s, export kvm.
only if the arch actually supports it.Signed-off-by: Avi Kivity
which makes this an 2.6.25 regression.
One way of solving the issue is to enhance Kbuild, but Avi and David conviced
me, that changing headers_install is not the way to go. This patch changes
the definition for linux/kvm.h to unifdef-y.If unifdef-y is used for linux/kvm.h "make headers_check" will fail on all
architectures without asm/kvm.h. Therefore, this patch also provides
asm/kvm.h on all architectures.Signed-off-by: Christian Borntraeger
Acked-by: Avi Kivity
Cc: Sam Ravnborg
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
24 Feb, 2008
1 commit
-
2.6.25-rc1 percpu changes broke CONFIG_DEBUG_PREEMPT's per_cpu checking
on several architectures. On s390, sparc64 and x86 it's been weakened to
not checking at all; whereas on powerpc64 it's become too strict, issuing
warnings from __raw_get_cpu_var in io_schedule and init_timer for example.Fix this by weakening powerpc's __my_cpu_offset to use the non-checking
local_paca instead of get_paca (which itself contains such a check);
and strengthening the generic my_cpu_offset to go the old slow way via
smp_processor_id when CONFIG_DEBUG_PREEMPT (debug_smp_processor_id is
where all the knowledge of what's correct when lives).Signed-off-by: Hugh Dickins
Reviewed-by: Mike Travis
Signed-off-by: Linus Torvalds
20 Feb, 2008
1 commit
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When adding __devinitconst etc. the __initconst variant
were missed.
Add this one and proper definitions for .head.text for use
in .S files.
The naming .head.text is preferred over .text.head as the
latter will conflict for a function named head when introducing
-ffunctions-sections.Signed-off-by: Sam Ravnborg
12 Feb, 2008
1 commit
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This avoids warnings with unreferenced variables in the !NUMA case.
Signed-off-by: Andi Kleen
Signed-off-by: Linus Torvalds
09 Feb, 2008
3 commits
-
Signed-off-by: Harvey Harrison
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Suppress A.OUT library support if CONFIG_ARCH_SUPPORTS_AOUT is not set.
Not all architectures support the A.OUT binfmt, so the ELF binfmt should not
be permitted to go looking for A.OUT libraries to load in such a case. Not
only that, but under such conditions A.OUT core dumps are not produced either.To make this work, this patch also does the following:
(1) Makes the existence of the contents of linux/a.out.h contingent on
CONFIG_ARCH_SUPPORTS_AOUT.(2) Renames dump_thread() to aout_dump_thread() as it's only called by A.OUT
core dumping code.(3) Moves aout_dump_thread() into asm/a.out-core.h and makes it inline. This
is then included only where needed. This means that this bit of arch
code will be stored in the appropriate A.OUT binfmt module rather than
the core kernel.(4) Drops A.OUT support for Blackfin (according to Mike Frysinger it's not
needed) and FRV.This patch depends on the previous patch to move STACK_TOP[_MAX] out of
asm/a.out.h and into asm/processor.h as they're required whether or not A.OUT
format is available.[jdike@addtoit.com: uml: re-remove accidentally restored code]
Signed-off-by: David Howells
Cc:
Signed-off-by: Jeff Dike
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Give architectures that support the new termios2 the possibilty to overide the
user_termios_to_kernel_termios and kernel_termios_to_user_termios macros. As
soon as all architectures that use the generic variant have been converted the
ifdefs can go away again. Architectures in question are avr32, frv, powerpc
and s390.Cc: Alan Cox
Cc: Paul Mackerras
Cc: David Howells
Cc: Haavard Skinnemoen
Cc: Martin Schwidefsky
Signed-off-by: Heiko Carstens
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
08 Feb, 2008
4 commits
-
Emulates the cmpxchg_local by disabling interrupts around variable modification.
This is not reentrant wrt NMIs and MCEs. It is only protected against normal
interrupts, but this is enough for architectures without such interrupt sources
or if used in a context where the data is not shared with such handlers.It can be used as a fallback for architectures lacking a real cmpxchg
instruction.For architectures that have a real cmpxchg but does not have NMIs or MCE,
testing which of the generic vs architecture specific cmpxchg is the fastest
should be done.asm-generic/cmpxchg.h defines a cmpxchg that uses cmpxchg_local. It is meant to
be used as a cmpxchg fallback for architectures that do not support SMP.* Patch series comments
Using cmpxchg_local shows a performance improvements of the fast path goes from
a 66% speedup on a Pentium 4 to a 14% speedup on AMD64.In detail:
Tested-by: Mathieu Desnoyers
Measurements on a Pentium4, 3GHz, Hyperthread.
SLUB Performance testing
========================
1. Kmalloc: Repeatedly allocate then free test* slub HEAD, test 1
kmalloc(8) = 201 cycles kfree = 351 cycles
kmalloc(16) = 198 cycles kfree = 359 cycles
kmalloc(32) = 200 cycles kfree = 381 cycles
kmalloc(64) = 224 cycles kfree = 394 cycles
kmalloc(128) = 285 cycles kfree = 424 cycles
kmalloc(256) = 411 cycles kfree = 546 cycles
kmalloc(512) = 480 cycles kfree = 619 cycles
kmalloc(1024) = 623 cycles kfree = 750 cycles
kmalloc(2048) = 686 cycles kfree = 811 cycles
kmalloc(4096) = 482 cycles kfree = 538 cycles
kmalloc(8192) = 680 cycles kfree = 734 cycles
kmalloc(16384) = 713 cycles kfree = 843 cycles* Slub HEAD, test 2
kmalloc(8) = 190 cycles kfree = 351 cycles
kmalloc(16) = 195 cycles kfree = 360 cycles
kmalloc(32) = 201 cycles kfree = 370 cycles
kmalloc(64) = 245 cycles kfree = 389 cycles
kmalloc(128) = 283 cycles kfree = 413 cycles
kmalloc(256) = 409 cycles kfree = 547 cycles
kmalloc(512) = 476 cycles kfree = 616 cycles
kmalloc(1024) = 628 cycles kfree = 753 cycles
kmalloc(2048) = 684 cycles kfree = 811 cycles
kmalloc(4096) = 480 cycles kfree = 539 cycles
kmalloc(8192) = 661 cycles kfree = 746 cycles
kmalloc(16384) = 741 cycles kfree = 856 cycles* cmpxchg_local Slub test
kmalloc(8) = 83 cycles kfree = 363 cycles
kmalloc(16) = 85 cycles kfree = 372 cycles
kmalloc(32) = 92 cycles kfree = 377 cycles
kmalloc(64) = 115 cycles kfree = 397 cycles
kmalloc(128) = 179 cycles kfree = 438 cycles
kmalloc(256) = 314 cycles kfree = 564 cycles
kmalloc(512) = 398 cycles kfree = 615 cycles
kmalloc(1024) = 573 cycles kfree = 745 cycles
kmalloc(2048) = 629 cycles kfree = 816 cycles
kmalloc(4096) = 473 cycles kfree = 548 cycles
kmalloc(8192) = 659 cycles kfree = 745 cycles
kmalloc(16384) = 724 cycles kfree = 843 cycles2. Kmalloc: alloc/free test
* slub HEAD, test 1
kmalloc(8)/kfree = 322 cycles
kmalloc(16)/kfree = 318 cycles
kmalloc(32)/kfree = 318 cycles
kmalloc(64)/kfree = 325 cycles
kmalloc(128)/kfree = 318 cycles
kmalloc(256)/kfree = 328 cycles
kmalloc(512)/kfree = 328 cycles
kmalloc(1024)/kfree = 328 cycles
kmalloc(2048)/kfree = 328 cycles
kmalloc(4096)/kfree = 678 cycles
kmalloc(8192)/kfree = 1013 cycles
kmalloc(16384)/kfree = 1157 cycles* Slub HEAD, test 2
kmalloc(8)/kfree = 323 cycles
kmalloc(16)/kfree = 318 cycles
kmalloc(32)/kfree = 318 cycles
kmalloc(64)/kfree = 318 cycles
kmalloc(128)/kfree = 318 cycles
kmalloc(256)/kfree = 328 cycles
kmalloc(512)/kfree = 328 cycles
kmalloc(1024)/kfree = 328 cycles
kmalloc(2048)/kfree = 328 cycles
kmalloc(4096)/kfree = 648 cycles
kmalloc(8192)/kfree = 1009 cycles
kmalloc(16384)/kfree = 1105 cycles* cmpxchg_local Slub test
kmalloc(8)/kfree = 112 cycles
kmalloc(16)/kfree = 103 cycles
kmalloc(32)/kfree = 103 cycles
kmalloc(64)/kfree = 103 cycles
kmalloc(128)/kfree = 112 cycles
kmalloc(256)/kfree = 111 cycles
kmalloc(512)/kfree = 111 cycles
kmalloc(1024)/kfree = 111 cycles
kmalloc(2048)/kfree = 121 cycles
kmalloc(4096)/kfree = 650 cycles
kmalloc(8192)/kfree = 1042 cycles
kmalloc(16384)/kfree = 1149 cyclesTested-by: Mathieu Desnoyers
Measurements on a AMD64 2.0 GHz dual-coreIn this test, we seem to remove 10 cycles from the kmalloc fast path.
On small allocations, it gives a 14% performance increase. kfree fast
path also seems to have a 10 cycles improvement.1. Kmalloc: Repeatedly allocate then free test
* cmpxchg_local slub
kmalloc(8) = 63 cycles kfree = 126 cycles
kmalloc(16) = 66 cycles kfree = 129 cycles
kmalloc(32) = 76 cycles kfree = 138 cycles
kmalloc(64) = 100 cycles kfree = 288 cycles
kmalloc(128) = 128 cycles kfree = 309 cycles
kmalloc(256) = 170 cycles kfree = 315 cycles
kmalloc(512) = 221 cycles kfree = 357 cycles
kmalloc(1024) = 324 cycles kfree = 393 cycles
kmalloc(2048) = 354 cycles kfree = 440 cycles
kmalloc(4096) = 394 cycles kfree = 330 cycles
kmalloc(8192) = 523 cycles kfree = 481 cycles
kmalloc(16384) = 643 cycles kfree = 649 cycles* Base
kmalloc(8) = 74 cycles kfree = 113 cycles
kmalloc(16) = 76 cycles kfree = 116 cycles
kmalloc(32) = 85 cycles kfree = 133 cycles
kmalloc(64) = 111 cycles kfree = 279 cycles
kmalloc(128) = 138 cycles kfree = 294 cycles
kmalloc(256) = 181 cycles kfree = 304 cycles
kmalloc(512) = 237 cycles kfree = 327 cycles
kmalloc(1024) = 340 cycles kfree = 379 cycles
kmalloc(2048) = 378 cycles kfree = 433 cycles
kmalloc(4096) = 399 cycles kfree = 329 cycles
kmalloc(8192) = 528 cycles kfree = 624 cycles
kmalloc(16384) = 651 cycles kfree = 737 cycles2. Kmalloc: alloc/free test
* cmpxchg_local slub
kmalloc(8)/kfree = 96 cycles
kmalloc(16)/kfree = 97 cycles
kmalloc(32)/kfree = 97 cycles
kmalloc(64)/kfree = 97 cycles
kmalloc(128)/kfree = 97 cycles
kmalloc(256)/kfree = 105 cycles
kmalloc(512)/kfree = 108 cycles
kmalloc(1024)/kfree = 105 cycles
kmalloc(2048)/kfree = 107 cycles
kmalloc(4096)/kfree = 390 cycles
kmalloc(8192)/kfree = 626 cycles
kmalloc(16384)/kfree = 662 cycles* Base
kmalloc(8)/kfree = 116 cycles
kmalloc(16)/kfree = 116 cycles
kmalloc(32)/kfree = 116 cycles
kmalloc(64)/kfree = 116 cycles
kmalloc(128)/kfree = 116 cycles
kmalloc(256)/kfree = 126 cycles
kmalloc(512)/kfree = 126 cycles
kmalloc(1024)/kfree = 126 cycles
kmalloc(2048)/kfree = 126 cycles
kmalloc(4096)/kfree = 384 cycles
kmalloc(8192)/kfree = 749 cycles
kmalloc(16384)/kfree = 786 cyclesTested-by: Christoph Lameter
I can confirm Mathieus' measurement now:Athlon64:
regular NUMA/discontig
1. Kmalloc: Repeatedly allocate then free test
10000 times kmalloc(8) -> 79 cycles kfree -> 92 cycles
10000 times kmalloc(16) -> 79 cycles kfree -> 93 cycles
10000 times kmalloc(32) -> 88 cycles kfree -> 95 cycles
10000 times kmalloc(64) -> 124 cycles kfree -> 132 cycles
10000 times kmalloc(128) -> 157 cycles kfree -> 247 cycles
10000 times kmalloc(256) -> 200 cycles kfree -> 257 cycles
10000 times kmalloc(512) -> 250 cycles kfree -> 277 cycles
10000 times kmalloc(1024) -> 337 cycles kfree -> 314 cycles
10000 times kmalloc(2048) -> 365 cycles kfree -> 330 cycles
10000 times kmalloc(4096) -> 352 cycles kfree -> 240 cycles
10000 times kmalloc(8192) -> 456 cycles kfree -> 340 cycles
10000 times kmalloc(16384) -> 646 cycles kfree -> 471 cycles
2. Kmalloc: alloc/free test
10000 times kmalloc(8)/kfree -> 124 cycles
10000 times kmalloc(16)/kfree -> 124 cycles
10000 times kmalloc(32)/kfree -> 124 cycles
10000 times kmalloc(64)/kfree -> 124 cycles
10000 times kmalloc(128)/kfree -> 124 cycles
10000 times kmalloc(256)/kfree -> 132 cycles
10000 times kmalloc(512)/kfree -> 132 cycles
10000 times kmalloc(1024)/kfree -> 132 cycles
10000 times kmalloc(2048)/kfree -> 132 cycles
10000 times kmalloc(4096)/kfree -> 319 cycles
10000 times kmalloc(8192)/kfree -> 486 cycles
10000 times kmalloc(16384)/kfree -> 539 cyclescmpxchg_local NUMA/discontig
1. Kmalloc: Repeatedly allocate then free test
10000 times kmalloc(8) -> 55 cycles kfree -> 90 cycles
10000 times kmalloc(16) -> 55 cycles kfree -> 92 cycles
10000 times kmalloc(32) -> 70 cycles kfree -> 91 cycles
10000 times kmalloc(64) -> 100 cycles kfree -> 141 cycles
10000 times kmalloc(128) -> 128 cycles kfree -> 233 cycles
10000 times kmalloc(256) -> 172 cycles kfree -> 251 cycles
10000 times kmalloc(512) -> 225 cycles kfree -> 275 cycles
10000 times kmalloc(1024) -> 325 cycles kfree -> 311 cycles
10000 times kmalloc(2048) -> 346 cycles kfree -> 330 cycles
10000 times kmalloc(4096) -> 351 cycles kfree -> 238 cycles
10000 times kmalloc(8192) -> 450 cycles kfree -> 342 cycles
10000 times kmalloc(16384) -> 630 cycles kfree -> 546 cycles
2. Kmalloc: alloc/free test
10000 times kmalloc(8)/kfree -> 81 cycles
10000 times kmalloc(16)/kfree -> 81 cycles
10000 times kmalloc(32)/kfree -> 81 cycles
10000 times kmalloc(64)/kfree -> 81 cycles
10000 times kmalloc(128)/kfree -> 81 cycles
10000 times kmalloc(256)/kfree -> 91 cycles
10000 times kmalloc(512)/kfree -> 90 cycles
10000 times kmalloc(1024)/kfree -> 91 cycles
10000 times kmalloc(2048)/kfree -> 90 cycles
10000 times kmalloc(4096)/kfree -> 318 cycles
10000 times kmalloc(8192)/kfree -> 483 cycles
10000 times kmalloc(16384)/kfree -> 536 cyclesChangelog:
- Ran though checkpatch.Signed-off-by: Mathieu Desnoyers
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Do not export asm/page.h during make headers_install. This removes PAGE_SIZE
from userspace headers.Signed-off-by: Kirill A. Shutemov
Reviewed-by: David Woodhouse
Cc: David Howells
Cc: Martin Schwidefsky
Cc: Heiko Carstens
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: H. Peter Anvin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Do not export asm/elf.h during make headers_install.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: David Woodhouse
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Do not export asm/user.h and linux/user.h during make headers_install.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: David Woodhouse
Cc: Thomas Gleixner
Cc: Ingo Molnar
Acked-by: H. Peter Anvin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
07 Feb, 2008
2 commits
-
When passing a zero address to kallsyms_lookup(), the kernel thought it was
a valid kernel address, even if it is not. This is because is_ksym_addr()
called is_kernel_extratext() and checked against labels that don't exist on
many archs (which default as zero). Since PPC was the only kernel which
defines _extra_text, (in 2005), and no longer needs it, this patch removes
_extra_text support.For some history (provided by Jon):
http://ozlabs.org/pipermail/linuxppc-dev/2005-September/019734.html
http://ozlabs.org/pipermail/linuxppc-dev/2005-September/019736.html
http://ozlabs.org/pipermail/linuxppc-dev/2005-September/019751.html[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Robin Getz
Cc: David Woodhouse
Cc: Jon Loeliger
Cc: Paul Mackerras
Cc: Benjamin Herrenschmidt
Cc: Sam Ravnborg
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This moves the ability to scale cputime into generic code. This allows us
to fix the issue in kernel/timer.c (noticed by Balbir) where we could only
add an unscaled value to the scaled utime/stime.This adds a cputime_to_scaled function. As before, the POWERPC version
does the scaling based on the last SPURR/PURR ratio calculated. The
generic and s390 (only other arch to implement asm/cputime.h) versions are
both NOPs.Also moves the SPURR and PURR snapshots closer.
Signed-off-by: Michael Neuling
Cc: Jay Lan
Cc: Paul Mackerras
Cc: Benjamin Herrenschmidt
Cc: Heiko Carstens
Cc: Martin Schwidefsky
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
06 Feb, 2008
2 commits
-
(with Martin Schwidefsky )
The pgd/pud/pmd/pte page table allocation functions get a mm_struct pointer as
first argument. The free functions do not get the mm_struct argument. This
is 1) asymmetrical and 2) to do mm related page table allocations the mm
argument is needed on the free function as well.[kamalesh@linux.vnet.ibm.com: i386 fix]
[akpm@linux-foundation.org: coding-syle fixes]
Signed-off-by: Benjamin Herrenschmidt
Signed-off-by: Martin Schwidefsky
Cc:
Signed-off-by: Kamalesh Babulal
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Provide new implementation infrastructure that platforms may choose to use
when implementing the GPIO programming interface. Platforms can update their
GPIO support to use this. In many cases the incremental cost to access a
non-inlined GPIO should be less than a dozen instructions, with the memory
cost being about a page (total) of extra data and code. The upside is:* Providing two features which were "want to have (but OK to defer)" when
GPIO interfaces were first discussed in November 2006:- A "struct gpio_chip" to plug in GPIOs that aren't directly supported
by SOC platforms, but come from FPGAs or other multifunction devices
using conventional device registers (like UCB-1x00 or SM501 GPIOs,
and southbridges in PCs with more open specs than usual).- Full support for message-based GPIO expanders, where registers are
accessed through sleeping I/O calls. Previous support for these
"cansleep" calls was just stubs. (One example: the widely used
pcf8574 I2C chips, with 8 GPIOs each.)* Including a non-stub implementation of the gpio_{request,free}() calls,
making those calls much more useful. The diagnostic labels are also
recorded given DEBUG_FS, so /sys/kernel/debug/gpio can show a snapshot
of all GPIOs known to this infrastructure.The driver programming interfaces introduced in 2.6.21 do not change at all;
this infrastructure is entirely below those covers.Signed-off-by: David Brownell
Cc: Sam Ravnborg
Cc: Jean Delvare
Cc: Eric Miao
Cc: Haavard Skinnemoen
Cc: Philipp Zabel
Cc: Russell King
Cc: Ben Gardner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
04 Feb, 2008
2 commits
-
After disabling both CONFIG_DEBUG_LOCKING_API_SELFTESTS and netconsole
(using current mainline) I get a login prompt, and also...[ 5.181668] SELinux: policy loaded with handle_unknown=deny
[ 5.183315] type=1403 audit(1202100038.157:3): policy loaded auid=4294967295 ses=4294967295
[ 5.822073] SELinux: initialized (dev usbfs, type usbfs), uses genfs_contexts
[ 7.819146] ------------[ cut here ]------------
[ 7.819146] WARNING: at kernel/lockdep.c:2033 trace_hardirqs_on+0x9b/0x10d()
[ 7.819146] Modules linked in: generic ext3 jbd ide_disk ide_core
[ 7.819146] Pid: 399, comm: hwclock Not tainted 2.6.24 #4
[ 7.819146] [] warn_on_slowpath+0x41/0x51
[ 7.819146] [] ? lock_release_holdtime+0x50/0x56
[ 7.819146] [] ? check_usage_forwards+0x19/0x3b
[ 7.819146] [] ? __lock_acquire+0xac3/0xb0b
[ 7.819146] [] ? native_sched_clock+0x8b/0x9f
[ 7.819146] [] ? lock_release_holdtime+0x50/0x56
[ 7.819146] [] ? _spin_unlock_irq+0x22/0x42
[ 7.819146] [] trace_hardirqs_on+0x9b/0x10d
[ 7.819146] [] _spin_unlock_irq+0x22/0x42
[ 7.819146] [] hpet_rtc_interrupt+0xdf/0x290
[ 7.819146] [] handle_IRQ_event+0x1a/0x46
[ 7.819146] [] handle_edge_irq+0xbe/0xff
[ 7.819146] [] do_IRQ+0x6d/0x84
[ 7.819146] [] common_interrupt+0x2e/0x34
[ 7.819146] [] ? ktime_get_ts+0x8/0x3f
[ 7.819146] [] ? lock_release+0x167/0x16f
[ 7.819146] [] ? core_sys_select+0x2c/0x327
[ 7.819146] [] core_sys_select+0x74/0x327
[ 7.819146] [] ? native_sched_clock+0x8b/0x9f
[ 7.819146] [] ? lock_release_holdtime+0x50/0x56
[ 7.819146] [] ? _spin_unlock_irq+0x22/0x42
[ 7.819146] [] ? trace_hardirqs_on+0xe6/0x10d
[ 7.819146] [] ? _spin_unlock_irq+0x2d/0x42
[ 7.819146] [] ? rtc_do_ioctl+0x11b/0x677
[ 7.819146] [] ? inode_has_perm+0x5e/0x68
[ 7.819146] [] ? lock_release_holdtime+0x50/0x56
[ 7.819146] [] ? native_sched_clock+0x8b/0x9f
[ 7.819146] [] ? file_has_perm+0x83/0x8c
[ 7.819146] [] ? rtc_ioctl+0xf/0x11
[ 7.819146] [] ? do_ioctl+0x55/0x67
[ 7.819146] [] sys_select+0x93/0x163
[ 7.819146] [] ? sysenter_past_esp+0x9a/0xa5
[ 7.819146] [] sysenter_past_esp+0x5f/0xa5
[ 7.819146] =======================
[ 7.819146] ---[ end trace 96540ca301ffb84c ]---
[ 7.819210] rtc: lost 6 interrupts
[ 7.870668] type=1400 audit(1202128840.794:4): avc: denied { audit_write } for pid=399 comm="hwclock" capability=29 scontext=system_u:system_r:hwclock_t:s0 tcontext=system_u:system_r:hwclock_t:s0 tclass=capability
[ 9.538866] input: PC Speaker as /class/input/input5Because hpet_rtc_interrupt()'s call to get_rtc_time() ends up
resolving to include/asm-generic/rtc.h's (hilariously inlined)
get_rtc_time(), which does spin_unlock_irq() from hard IRQ context.The obvious patch fixes it.
Signed-off-by: Thomas Gleixner
Signed-off-by: Ingo Molnar -
Remove unused from ; per
Christoph Lameter this should have been part of a previous patch
reversal but apparently didn't get removed.Signed-off-by: H. Peter Anvin
Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner
01 Feb, 2008
1 commit
-
bring back the avr32, blackfin, sh, sparc architectures into working order,
by reverting the effects of this change that came in via the x86 tree:commit a5a19c63f4e55e32dc0bc3d936d7f94793d8b380
Author: Jeremy Fitzhardinge
Date: Wed Jan 30 13:33:39 2008 +0100x86: demacro asm-x86/pgalloc_32.h
Sorry about that!
Signed-off-by: Ingo Molnar
30 Jan, 2008
8 commits
-
Latest update; I now have 4 NX tests, but 2 fail so they're #if 0'd.
I also cleaned up the NX test code quite a bit, and got rid of the ugly
exception table sorting stuff.From: Arjan van de Ven
This patch adds testcases for the CONFIG_DEBUG_RODATA configuration option
as well as the NX CPU feature/mappings. Both testcases can move to tests/
once that patch gets merged into mainline.
(I'm half considering moving the rodata test into mm/init.c but I'll
wait with that until init.c is unified)As part of this I had to fix a not-quite-right alignment in the vmlinux.lds.h
for the RODATA sections, which lead to 1 page less being marked read only.Signed-off-by: Arjan van de Ven
Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner -
Convert macros into inline functions, for better type-checking.
This patch required a little bit of fiddling with headers in order to
make __(pte|pmd)_free_tlb inline rather than macros.
asm-generic/tlb.h includes asm/pgalloc.h, though it doesn't directly
use any pgalloc definitions. I removed this include to avoid an
include cycle, but it may cause secondary compile failures by things
depending on the indirect inclusion; arch/x86/mm/hugetlbpage.c was one
such place; there may be others.Signed-off-by: Jeremy Fitzhardinge
Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner -
Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner -
- add support for PER_CPU_ATTRIBUTES
- fix generic smp percpu_modcopy to use per_cpu_offset() macro.
Add the ability to use generic/percpu even if the arch needs to override
several aspects of its operations. This will enable the use of generic
percpu.h for all arches.An arch may define:
__per_cpu_offset Do not use the generic pointer array. Arch must
define per_cpu_offset(cpu) (used by x86_64, s390).__my_cpu_offset Can be defined to provide an optimized way to determine
the offset for variables of the currently executing
processor. Used by ia64, x86_64, x86_32, sparc64, s/390.SHIFT_PTR(ptr, offset) If an arch defines it then special handling
of pointer arithmentic may be implemented. Used
by s/390.(Some of these special percpu arch implementations may be later consolidated
so that there are less cases to deal with.)Cc: Rusty Russell
Cc: Andi Kleen
Signed-off-by: Christoph Lameter
Signed-off-by: Mike Travis
Signed-off-by: Thomas Gleixner
Signed-off-by: Ingo Molnar -
- Special consideration for IA64: Add the ability to specify
arch specific per cpu flags- remove .data.percpu attribute from DEFINE_PER_CPU for non-smp case.
The arch definitions are all the same. So move them into linux/percpu.h.
We cannot move DECLARE_PER_CPU since some include files just include
asm/percpu.h to avoid include recursion problems.Cc: Rusty Russell
Cc: Andi Kleen
Signed-off-by: Christoph Lameter
Signed-off-by: Mike Travis
Signed-off-by: Thomas Gleixner
Signed-off-by: Ingo Molnar -
The use of the __GENERIC_PERCPU is a bit problematic since arches
may want to run their own percpu setup while using the generic
percpu definitions. Replace it through a kconfig variable.Cc: Rusty Russell
Cc: Andi Kleen
Signed-off-by: Christoph Lameter
Signed-off-by: Mike Travis
Signed-off-by: Thomas Gleixner
Signed-off-by: Ingo Molnar -
A quick grep shows that there are currently 1145 instances of WARN_ON
in the kernel. Currently, WARN_ON is pretty much entirely inlined,
which makes it hard to enhance it without growing the size of the kernel
(and getting Andrew unhappy).This patch build on top of Olof's patch that introduces __WARN,
and places the slowpath out of line. It also uses Ingo's suggestion
to not use __FUNCTION__ but to use kallsyms to do the lookup;
this saves a ton of extra space since gcc doesn't need to store the function
string twice now:3936367 833603 624736 5394706 525112 vmlinux.before
3917508 833603 624736 5375847 520767 vmlinux-slowpath15Kb savings...
Signed-off-by: Arjan van de Ven
CC: Andrew Morton
CC: Olof Johansson
Acked-by: Matt Meckall
Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner -
Introduce __WARN() in the generic case, so the generic WARN_ON()
can use arch-specific code for when the condition is true.Signed-off-by: Olof Johansson
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner
29 Jan, 2008
6 commits
-
* git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild: (79 commits)
Remove references to "make dep"
kconfig: document use of HAVE_*
Introduce new section reference annotations tags: __ref, __refdata, __refconst
kbuild: warn about ld added unique sections
kbuild: add verbose option to Section mismatch reporting in modpost
kconfig: tristate choices with mixed tristate and boolean values
asm-generic/vmlix.lds.h: simplify __mem{init,exit}* dependencies
remove __attribute_used__
kbuild: support ARCH=x86 in buildtar
kconfig: remove "enable"
kbuild: simplified warning report in modpost
kbuild: introduce a few helpers in modpost
kbuild: use simpler section mismatch warnings in modpost
kbuild: link vmlinux.o before kallsyms passes
kbuild: introduce new option to enhance section mismatch analysis
Use separate sections for __dev/__cpu/__mem code/data
compiler.h: introduce __section()
all archs: consolidate init and exit sections in vmlinux.lds.h
kbuild: check section names consistently in modpost
kbuild: introduce blacklisting in modpost
... -
This function is used by the ext4 multi block allocator patches.
Also add generic_find_next_le_bit
Signed-off-by: Aneesh Kumar K.V
Cc:
Signed-off-by: Andrew Morton -
Today we have the following annotations for functions/data
referencing __init/__exit functions / data:__init_refok => for init functions
__initdata_refok => for init data
__exit_refok => for exit functionsThere is really no difference between the __init and __exit
versions and simplify it and to introduce a shorter annotation
the following new annotations are introduced:__ref => for functions (code) that
references __*init / __*exit
__refdata => for variables
__refconst => for const variablesWhit this annotation is it more obvious what the annotation
is for and there is no longer the arbitary division
between __init and __exit code.The mechanishm is the same as before - a special section
is created which is made part of the usual sections
in the linker script.We will start to see annotations like this:
-static struct pci_serial_quirk pci_serial_quirks[] = {
+static const struct pci_serial_quirk pci_serial_quirks[] __refconst = {
-----------------
-static struct notifier_block __cpuinitdata cpuid_class_cpu_notifier =
+static struct notifier_block cpuid_class_cpu_notifier __refdata =
----------------
-static int threshold_cpu_callback(struct notifier_block *nfb,
+static int __ref threshold_cpu_callback(struct notifier_block *nfb,[The above is just random samples].
Note: No modifications were needed in modpost
to support the new sections due to the newly introduced
blacklisting.Signed-off-by: Sam Ravnborg
-
Simplify the dependencies on __mem{init,exit}* (ACPI_HOTPLUG_MEMORY requires
MEMORY_HOTPLUG).Signed-off-by: Adrian Bunk
Signed-off-by: Sam Ravnborg -
Introducing separate sections for __dev* (HOTPLUG),
__cpu* (HOTPLUG_CPU) and __mem* (MEMORY_HOTPLUG)
allows us to do a much more reliable Section mismatch
check in modpost. We are no longer dependent on the actual
configuration of for example HOTPLUG.This has the effect that all users see much more
Section mismatch warnings than before because they
were almost all hidden when HOTPLUG was enabled.
The advantage of this is that when building a piece
of code then it is much more likely that the Section
mismatch errors are spotted and the warnings will be
felt less random of nature.Signed-off-by: Sam Ravnborg
Cc: Greg KH
Cc: Randy Dunlap
Cc: Adrian Bunk -
This patch consolidate all definitions of .init.text, .init.data
and .exit.text, .exit.data section definitions in
the generic vmlinux.lds.h.This is a preparational patch - alone it does not buy
us much good.Signed-off-by: Sam Ravnborg
