Generic versions of __find_first_bit and __find_first_zero_bit
are introduced as simplified versions of __find_next_bit and
__find_next_zero_bit. Their compilation and use are guarded by
a new config variable GENERIC_FIND_FIRST_BIT.

The generic versions of find_first_bit and find_first_zero_bit
are implemented in terms of the newly introduced __find_first_bit
and __find_first_zero_bit.

This patch does not remove the i386-specific implementation,
but it does switch i386 to use the generic functions by setting
GENERIC_FIND_FIRST_BIT=y for X86_32.
Signed-off-by: NAlexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

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: NAlexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Implement __fls on all 64-bit archs:

alpha has an implementation of fls64.
	Added __fls(x) = fls64(x) - 1.

ia64 has fls, but not __fls.
	Added __fls based on code of fls.

mips and powerpc have __ilog2, which is the same as __fls.
	Added __fls = __ilog2.

parisc, s390, sh and sparc64:
	Include generic __fls.

x86_64 already has __fls.
Signed-off-by: NAlexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

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: NAlexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Some of those can be written in such a way that the same
inline assembly can be used to generate both 32 bit and
64 bit code.

For ffs and fls, x86_64 unconditionally used the cmov
instruction and i386 unconditionally used a conditional
branch over a mov instruction. In the current patch I
chose to select the version based on the availability
of the cmov instruction instead. A small detail here is
that x86_64 did not previously set CONFIG_X86_CMOV=y.

Improved comments for ffs, ffz, fls and variations.
Signed-off-by: NAlexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

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 vmlinux

After 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 vmlinux

After 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: NIngo Molnar <mingo@elte.hu>

Update UML to use the generic bits too.
Signed-off-by: NAlexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

The versions with inline assembly are in fact slower on the machines I
tested them on (in userspace) (Athlon XP 2800+, p4-like Xeon 2.8GHz, AMD
Opteron 270). The i386-version needed a fix similar to 06024f21 to avoid
crashing the benchmark.

Benchmark using: gcc -fomit-frame-pointer -Os. For each bitmap size
1...512, for each possible bitmap with one bit set, for each possible
offset: find the position of the first bit starting at offset. If you
follow ;). Times include setup of the bitmap and checking of the
results.

		Athlon		Xeon		Opteron 32/64bit
x86-specific:	0m3.692s	0m2.820s	0m3.196s / 0m2.480s
generic:	0m2.622s	0m1.662s	0m2.100s / 0m1.572s

If the bitmap size is not a multiple of BITS_PER_LONG, and no set
(cleared) bit is found, find_next_bit (find_next_zero_bit) returns a
value outside of the range [0, size]. The generic version always returns
exactly size. The generic version also uses unsigned long everywhere,
while the x86 versions use a mishmash of int, unsigned (int), long and
unsigned long.

Using the generic version does give a slightly bigger kernel, though.

defconfig:	   text    data     bss     dec     hex filename
x86-specific:	4738555  481232  626688 5846475  5935cb vmlinux (32 bit)
generic:	4738621  481232  626688 5846541  59360d vmlinux (32 bit)
x86-specific:	5392395  846568  724424 6963387  6a40bb vmlinux (64 bit)
generic:	5392458  846568  724424 6963450  6a40fa vmlinux (64 bit)
Signed-off-by: NAlexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

pointed out by Linus: arch/um/Kconfig.x86_64 should
include arch/x86/Kconfig.cpu instead of defining those
symbols itself.
Signed-off-by: NIngo Molnar <mingo@elte.hu>

fix:

 arch/um/os-Linux/helper.c: In function 'run_helper':
 arch/um/os-Linux/helper.c:73: error: 'PATH_MAX' undeclared (first use in this function)
Signed-off-by: NIngo Molnar <mingo@elte.hu>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86-fixes:
  x86 PAT: decouple from nonpromisc devmem
  x86 PAT: tone down debugging messages

* git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb:
  V4L/DVB (7751): ir-kbd-i2c: Save a temporary memory allocation in ir_probe
  V4L/DVB (7750): au0828/ cleanups and fixes
  V4L/DVB (7748): tuner-core: some adjustments at tuner logs, if debug enabled
  V4L/DVB (7746): pvrusb2: make signed one-bit bitfields unsigned
  V4L/DVB (7744): pvrusb2-dvb: add atsc/qam support for Hauppauge pvrusb2 model 751xx
  V4L/DVB (7742): cx88: Add support for the DViCO FusionHDTV_7_GOLD digital modes
  V4L/DVB (7741): s5h1411: Adding support for this ATSC/QAM demodulator
  V4L/DVB (7740): tuner-xc2028.c dubious !x & y
  V4L/DVB (7739): mt312.h: dubious one-bit signed bitfield
  V4L/DVB (7735): Fix compilation for au0828
  V4L/DVB (7734): em28xx: copy and paste error in em28xx_init_isoc
  V4L/DVB (7733): blackbird_find_mailbox negative return ignored in blackbird_initialize_codec()
  V4L/DVB (7732): vivi: fix a warning

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86-optimized-inlining

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86-optimized-inlining:
  generic: make optimized inlining arch-opt-in
  x86: add optimized inlining

* git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6: (61 commits)
  ide: sanitize handling of IDE_HFLAG_NO_SET_MODE host flag
  sis5513: fail early for unsupported chipsets
  it821x: fix kzalloc() failure handling
  qd65xx: use IDE_HFLAG_SINGLE host flag
  qd65xx: always use ->selectproc method
  ide-cd: put proc-related functions together under single ifdef
  ide-cd: Replace __FUNCTION__ with __func__
  IDE: Coding Style fixes to drivers/ide/ide-cd.c
  IDE: Coding Style fixes to drivers/ide/pci/cy82c693.c
  IDE: Coding Style fixes to drivers/ide/pci/it8213.c
  IDE: Coding Style fixes to drivers/ide/ide-floppy.c
  IDE: Coding Style fixes to drivers/ide/legacy/ali14xx.c
  IDE: Coding Style fixes to drivers/ide/legacy/hd.c
  IDE: Coding Style fixes to drivers/ide/pci/cmd640.c
  IDE: Coding Style fixes to drivers/ide/pci/opti621.c
  IDE: Coding Style fixes to drivers/ide/ide-pnp.c
  IDE: Coding Style fixes to drivers/ide/ide-proc.c
  IDE: Coding Style fixes to drivers/ide/legacy/ide-4drives.c
  IDE: Coding Style fixes to drivers/ide/legacy/umc8672.c
  IDE: Coding Style fixes to drivers/ide/pci/generic.c
  ...

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86-misc: (28 commits)
  x86: section mismatch fixes, #3
  x86: section mismatch fixes, #2
  x86: pgtable_32.h - prototype and section mismatch fixes
  x86: unlock_ExtINT_logic() - fix section mismatch warnings
  x86: uniq_ioapic_id - fix section mismatch warning
  x86: trampoline_32.S - switch to .cpuinit.data
  x86: use get_bios_ebda()
  x86: remove duplicate get_bios_ebda() from rio.h
  x86: get_bios_ebda() requires asm/io.h
  x86: use cpumask function for present, possible, and online cpus
  x86: cleanup div_sc() usage
  x86: cleanup clocksource_hz2mult usage
  x86: remove unnecessary memset and NULL check after alloc_bootmem()
  x86: use bitmap library for pin_programmed
  x86: use MP_intsrc_info()
  x86: use BUILD_BUG_ON() for the size of struct intel_mp_floating
  x86_64 ia32 ptrace: convert to compat_arch_ptrace
  x86_64 ia32 ptrace: use compat_ptrace_request for siginfo
  x86 signals: lift set_fs
  x86 signals: lift flags diddling code
  ...

Linus pointed it out that PAT should not depend on NONPROMISC_DEVMEM.

Also make PAT non-default.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'agp-patches' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/agp-2.6:
  agp: convert drivers/char/agp/frontend.c to use unlocked_ioctl
  agp: fix shadowed variable warning in amd-k7-agp.c

* 'drm-patches' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
  drm: _end is shadowing real _end, just rename it.
  drm/vbl rework: rework how the drm deals with vblank.
  drm: reorganise minor number handling using backported modesetting code.
  drm/i915: Handle tiled buffers in vblank tasklet
  drm/i965: On I965, use correct 3DSTATE_DRAWING_RECTANGLE command in vblank
  drm: Remove unneeded dma sync in ATI pcigart alloc
  drm: Fix mismerge of non-coherent DMA patch

	Arrgghhh...

Sorry about that, I'd been sure I'd folded that one, but it actually got
lost.  Please apply - that breaks execve().
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Tested-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Stephen Rothwell reported that linux-next did not build on powerpc64.

make optimized inlining dependent on architecture opt-in.
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

add CONFIG_OPTIMIZE_INLINING=y.

allow gcc to optimize the kernel image's size by uninlining
functions that have been marked 'inline'. Previously gcc was
forced by Linux to always-inline these functions via a gcc
attribute:

 #define inline	inline __attribute__((always_inline))

Especially when the user has already selected
CONFIG_OPTIMIZE_FOR_SIZE=y this can make a huge difference in
kernel image size (using a standard Fedora .config):

   text    data     bss     dec           hex filename
   5613924  562708 3854336 10030968    990f78 vmlinux.before
   5486689  562708 3854336  9903733    971e75 vmlinux.after

that's a 2.3% text size reduction (!).
Signed-off-by: NIngo Molnar <mingo@elte.hu>

* Check for IDE_HFLAG_NO_SET_MODE host flag in ide_set_pio(),
  ide_set_[pio,dma]_mode(), ide_set_xfer_rate() and set_pio_mode().

* Remove no longer needed IDE_HFLAG_NO_SET_MODE host flag checking
  from ide_tune_dma().

* Remove superfluous ->set_pio_mode checking from do_special().

This is a part of preparations for adding 'struct ide_port_ops'.
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

* Factor out chipset family detection from init_chipset_sis5513()
  to sis_find_family().

* Use sis_find_family() in sis5513_init_one() to fail early if the
  chipset is unsupported.

* Keep a local copy sis5513_chipset in sis5513_init_one()
  and set .udma_mask according to chipset family.

* Remove no longer need ->ultra_mask setting from init_hwif_sis5513().
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Allocate 'struct it821x_dev' objects for both ports in it821x_init_one().

Fixes potential OOPS in it821x_quirkproc() (uses 'itdev' unconditionally)
and other problems ('itdev' is needed for correct operation of the driver).
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

* Set IDE_HFLAG_SINGLE host flag in qd_probe() for QD6500 and QD6580
  with the second port disabled.

* Check for IDE_HFLAG_SINGLE in qd6580_port_init_devs() instead of
  using cached value of QD6580 Control register.

* Don't cache QD6580 Control register value in hwif->config_data
  (bits 8-15) and remove no longer needed QD_CONTROL() macro.

* Cache QD65xx base address in hwif->config_data (bits 8-15)
  instead of hwif->select_data.

* Set hwif->config_data in qd_probe() and remove qd_setup() helper.
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

qd_select() checks itself whether timings should be reprogrammed so
remove superfluous qd_timing_ok() and always use ->selectproc method
(rename qd_select() to qd65xx_select() while at it).
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

[bart: ported it over Paolo's patch]
Signed-off-by: NBorislav Petkov <petkovbb@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

[bart: md5sum checked]
Signed-off-by: NPaolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Before:
total: 43 errors, 66 warnings, 2183 lines checked

After:
total: 0 errors, 36 warnings, 2192 lines checked

I didn't (and I don't plan to) fix the warnings:
WARNING: line over 80 characters

[bart: minor fixes, md5sum checked (modulo s/"ignore = NULL;"/"ignore;"/ fix)]
Signed-off-by: NPaolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Before:
total: 34 errors, 14 warnings, 456 lines checked

After:
total: 0 errors, 8 warnings, 456 lines checked

[bart: md5sum checked]
Signed-off-by: NPaolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

File is now error free, only a few
WARNING: line over 80 characters
are left.

Compile tested.

[bart: md5sum checked]
Signed-off-by: NPaolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Acked-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

File is now error free.
Compile tested.

[bart: minor fixes, md5sum checked]
Signed-off-by: NPaolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

File is now error free, 2 warnings left.
Compile tested.

[bart: md5sum checked]
Signed-off-by: NPaolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Fix a lot of errors and warnings.
Compile tested.

[bart: some fixes, md5sum checked]
Signed-off-by: NPaolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Fix all the errors and a few warnings.
Compile tested.

[bart: some fixes, md5sum checked]
Signed-off-by: NPaolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Compile tested.

[bart: some fixes, md5sum checked]
Signed-off-by: NPaolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

File is now error free.
Compile tested.

[bart: md5sum checked]
Signed-off-by: NPaolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Lot of errors and warnings removed.
Compile tested.

[bart: minor fixes, md5sum checked]
Signed-off-by: NPaolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

File is now error and warning free.
Compile tested.

[bart: md5sum checked]
Signed-off-by: NPaolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

File is now error free.
Compile tested.

[bart: minor fixes, md5sum checked]
Signed-off-by: NPaolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>