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* [SPARC32]: Build fix.Andrew Morton2007-05-31
| | | | | | | | | | | | | | | Fix 6197fe4d720ea3e2ee94cdc7ef32d6c0151199de arch/sparc/lib/atomic32.c: In function '__cmpxchg_u32': arch/sparc/lib/atomic32.c:127: error: 'addr' undeclared (first use in this function) arch/sparc/lib/atomic32.c:127: error: (Each undeclared identifier is reported only once arch/sparc/lib/atomic32.c:127: error: for each function it appears in.) I assume this is what was intended.. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: William Irwin <wli@holomorphy.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Mark as emulating cmpxchg, add appropriate depends for DRM.Martin Habets2007-05-29
| | | | | | | | | The DRM code depends on an atomic version of cmpxchg(), which is not available on sparc32. Since other platforms besides sparc32 have this issue a KCONFIG option is added for it. Signed-off-by: Martin Habets <errandir_news@mph.eclipse.co.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Emulate cmpxchg like pariscKyle McMartin2007-05-29
| | | | | Signed-off-by: Kyle McMartin <kyle@parisc-linux.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC32]: Removes mismatch section warnigs in sparc time.c fileKrzysztof Helt2007-05-29
| | | | | | | | This patch removes mismatch section warnings in the sparc/kernel/time.c file. Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl> Signed-off-by: David S. Miller <davem@davemloft.net>
* all-archs: consolidate .data section definition in asm-genericSam Ravnborg2007-05-19
| | | | | | | With this consolidation we can now modify the .data section definition in one spot for all archs. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* all-archs: consolidate .text section definition in asm-genericSam Ravnborg2007-05-19
| | | | | | Move definition of .text section to asm-generic. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* [SPARC32]: Update defconfig.David S. Miller2007-05-14
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC32]: Fix sparc32 kdebug changes.Robert Reif2007-05-14
| | | | | | | Fix recent kdebug changes to compile on sparc32. Signed-off-by: Robert Reif <reif@earthlink.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Wire up signalfd/timerfd/eventfd syscalls.David S. Miller2007-05-12
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Spelling fixes.Simon Arlott2007-05-12
| | | | | | | Spelling fixes in arch/sparc/. Signed-off-by: Simon Arlott <simon@fire.lp0.eu> Signed-off-by: David S. Miller <davem@davemloft.net>
* rename thread_info to stackRoman Zippel2007-05-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This finally renames the thread_info field in task structure to stack, so that the assumptions about this field are gone and archs have more freedom about placing the thread_info structure. Nonbroken archs which have a proper thread pointer can do the access to both current thread and task structure via a single pointer. It'll allow for a few more cleanups of the fork code, from which e.g. ia64 could benefit. Signed-off-by: Roman Zippel <zippel@linux-m68k.org> [akpm@linux-foundation.org: build fix] Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ian Molton <spyro@f2s.com> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Mikael Starvik <starvik@axis.com> Cc: David Howells <dhowells@redhat.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Greg Ungerer <gerg@uclinux.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Cc: Richard Curnow <rc@rc0.org.uk> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp> Cc: Andi Kleen <ak@muc.de> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [SPARC]: Wire up utimensat syscall.David S. Miller2007-05-08
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* header cleaning: don't include smp_lock.h when not usedRandy Dunlap2007-05-08
| | | | | | | | | | | | Remove includes of <linux/smp_lock.h> where it is not used/needed. Suggested by Al Viro. Builds cleanly on x86_64, i386, alpha, ia64, powerpc, sparc, sparc64, and arm (all 59 defconfigs). Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* move die notifier handling to common codeChristoph Hellwig2007-05-08
| | | | | | | | | | | | | | | | | | | | | | | This patch moves the die notifier handling to common code. Previous various architectures had exactly the same code for it. Note that the new code is compiled unconditionally, this should be understood as an appel to the other architecture maintainer to implement support for it aswell (aka sprinkling a notify_die or two in the proper place) arm had a notifiy_die that did something totally different, I renamed it to arm_notify_die as part of the patch and made it static to the file it's declared and used at. avr32 used to pass slightly less information through this interface and I brought it into line with the other architectures. [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: fix vmalloc_sync_all bustage] [bryan.wu@analog.com: fix vmalloc_sync_all in nommu] Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: <linux-arch@vger.kernel.org> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [SPARC]: Fix comment typo in smp4m_blackbox_current().David S. Miller2007-05-07
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [PATCH] x86: Allow percpu variables to be page-alignedJeremy Fitzhardinge2007-05-02
| | | | | | | | | | | | | | | Let's allow page-alignment in general for per-cpu data (wanted by Xen, and Ingo suggested KVM as well). Because larger alignments can use more room, we increase the max per-cpu memory to 64k rather than 32k: it's getting a little tight. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
* [SPARC]: device_node name constification falloutStephen Rothwell2007-04-26
| | | | | | | A couple of routines need their arguments to be const. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Use strcasecmp for OFW property name comparisons.David S. Miller2007-04-26
| | | | | | | | This allows us to simplify sharing code with powerpc which has properties that have various forms of capitalization when on the sparc64 side the property is all lower-case. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: constify some paramaters of OF routinesStephen Rothwell2007-04-26
| | | | | | | | This starts bringing the PowerPC and Sparc implemetations back closer together. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC/64]: constify of_get_property returnStephen Rothwell2007-04-26
| | | | | | | Finally, we actually change the functions themselves. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: constify of_get_property return: arch/sparcStephen Rothwell2007-04-26
| | | | | Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Fix section mismatch warnings in pci.c and pcic.cRobert Reif2007-04-12
| | | | | | | | Fix section mismatch in arch/sparc/kernel/pcic.c and arch/sparc64/kernel/pci.c. Signed-off-by: Robert Reif <reif@earthlink.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: avoid CHILD_MAX and OPEN_MAX constantsRoland McGrath2007-04-12
| | | | | | | | | | | | | | | | I don't figure anyone really cares about SunOS syscall emulation, and I certainly don't. But I'm getting rid of uses of the OPEN_MAX and CHILD_MAX compile-time constant, and these are almost the only ones. OPEN_MAX is a bogus constant with no meaning about anything. The RLIMIT_NOFILE resource limit is what sysconf (_SC_OPEN_MAX) actually wants to return. The CHILD_MAX cases weren't actually using anything I want to get rid of, but I noticed that they are there and are wrong too. The CHILD_MAX value is not really unlimited as a -1 return from sysconf indicates. The RLIMIT_NPROC resource limit is what sysconf (_SC_CHILD_MAX) wants to return. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC32]: Fix SMP build regressionRobert Reif2007-03-27
| | | | | | | | | | | | commit b19cbe2a1695c09c74f83646c4b82b51123b3690 [BRIDGE]: Fix fdb RCU race breaks sparc SMP build because atomic_add_unless is not exported. This patch exports atomic_add_unless and atomic_cmpxchg. Signed-off-by: Robert Reif <reif@earthlink.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* [PATCH] sparc: nr_free_pages() is unsigned longAl Viro2007-03-14
| | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Acked-by: William Irwin <wli@holomorphy.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [SPARC]: Hook up missing syscalls.David S. Miller2007-03-12
| | | | | | | | | | | | | | | sys_mbind sys_get_mempolicy sys_set_mempolicy sys_kexec_load sys_move_pages sys_getcpu sys_epoll_pwait This work is largely a result of David Woodhouse's most excellent missing syscalls patch. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Fix TIF_USEDFPU flag atomicityWilliam Lee Irwin III2007-03-12
| | | | | | From: William Lee Irwin III <wli@holomorphy.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Provide pci_device_to_OF_node() just like powerpc.David S. Miller2007-03-02
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Handle unresolvable resources better in of_device.cDavid S. Miller2007-03-02
| | | | | | Just leave them as zero if we couldn't calculate it. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Fix bus handling in build_device_resources().David S. Miller2007-03-02
| | | | | | | | | | | | | | We mistakedly modify 'bus' in the innermost loop. What should happen is that at each register index iteration, we start with the same 'bus'. So preserve it's value at the top level, and use a loop local variable 'dbus' for iteration. This bug causes registers other than the first to be decoded improperly. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Re-export saved_command_line to modules.David S. Miller2007-02-12
| | | | | | | | | | | | | This reverts some bogosity from the dynamic command-line changes made on sparc32 and sparc64. Drivers such as drivers/sbus/char/openprom.c reference saved_command_line, and can be modular. The boot_command_line is __initdata, yet the dynamic command-line changes add modular exports of that symbol, obviously wrong. Signed-off-by: David S. Miller <davem@davemloft.net>
* [PATCH] mark struct file_operations const 2Arjan van de Ven2007-02-12
| | | | | | | | | | | | Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. [akpm@osdl.org: sparc64 fix] Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] Dynamic kernel command-line: sparcAlon Bar-Lev2007-02-12
| | | | | | | | | | Rename saved_command_line into boot_command_line. Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] signal: use kill_pgrp not kill_pg in the sunos compatibility codeEric W. Biederman2007-02-12
| | | | | | | | | | | | | | I am slowly moving to a model where all process killing is struct pid based instead of pid_t based. The sunos compatibility code is one of the last users of the old pid_t based kill_pg in the kernel. By being complete I allow for the future removal of kill_pg from the kernel, which will ensure I don't miss something. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] sort the devres mess outAl Viro2007-02-11
| | | | | | | | | | | | | * Split the implementation-agnostic stuff in separate files. * Make sure that targets using non-default request_irq() pull kernel/irq/devres.o * Introduce new symbols (HAS_IOPORT and HAS_IOMEM) defaulting to positive; allow architectures to turn them off (we needed these symbols anyway for dependencies of quite a few drivers). * protect the ioport-related parts of lib/devres.o with CONFIG_HAS_IOPORT. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] Consolidate default sched_clock()Alexey Dobriyan2007-02-11
| | | | | | | | | Use attribute(weak). Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] consolidate line discipline number definitionsTilman Schmidt2007-02-11
| | | | | | | | | | | | | | | | | | | The line discipline numbers N_* are currently defined for each architecture individually, but (except for a seeming mistake) identically, in asm/termios.h. There is no obvious reason why these numbers should be architecture specific, nor any apparent relationship with the termios structure. The total number of these, NR_LDISCS, is defined in linux/tty.h anyway. So I propose the following patch which moves the definitions of the individual line disciplines to linux/tty.h too. Three of these numbers (N_MASC, N_PROFIBUS_FDL, and N_SMSBLOCK) are unused in the current kernel, but the patch still keeps the complete set in case there are plans to use them yet. Signed-off-by: Tilman Schmidt <tilman@imap.cc> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] disable init/initramfs.c: architecturesJean-Paul Saman2007-02-11
| | | | | | | | | | | | Update all arch/*/kernel/vmlinux.lds.S to not include space for initramfs when CONFIG_BLK_DEV_INITRAMFS is not selected. This saves another 4 kbytes on most platfoms (some reserve PAGE_SIZE for initramfs). Signed-off-by: Jean-Paul Saman <jean-paul.saman@nxp.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] Set CONFIG_ZONE_DMA for arches with GENERIC_ISA_DMAChristoph Lameter2007-02-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | As Andi pointed out: CONFIG_GENERIC_ISA_DMA only disables the ISA DMA channel management. Other functionality may still expect GFP_DMA to provide memory below 16M. So we need to make sure that CONFIG_ZONE_DMA is set independent of CONFIG_GENERIC_ISA_DMA. Undo the modifications to mm/Kconfig where we made ZONE_DMA dependent on GENERIC_ISA_DMA and set theses explicitly in each arches Kconfig. Reviews must occur for each arch in order to determine if ZONE_DMA can be switched off. It can only be switched off if we know that all devices supported by a platform are capable of performing DMA transfers to all of memory (Some arches already support this: uml, avr32, sh sh64, parisc and IA64/Altix). In order to switch ZONE_DMA off conditionally, one would have to establish a scheme by which one can assure that no drivers are enabled that are only capable of doing I/O to a part of memory, or one needs to provide an alternate means of performing an allocation from a specific range of memory (like provided by alloc_pages_range()) and insure that all drivers use that call. In that case the arches alloc_dma_coherent() may need to be modified to call alloc_pages_range() instead of relying on GFP_DMA. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] sanitize sections for sparc32 smpAl Viro2007-02-01
| | | | | | | | | | a) sun4d_boot_one_cpu() should be __cpuinit (called only from __cpuinit __cpu_up(), for one thing, leads to calls of __cpuinit functions for another). b) got externs in arch/sparc/kernel/smp.c to match reality. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] missing exports of pm_power_off() on alpha and sparc32Al Viro2007-01-30
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [SPARC64]: Fix of_iounmap() region release.David S. Miller2006-12-31
| | | | | | | | | | We need to pass in the resource otherwise we cannot release the region properly. We must know whether it is an I/O or MEM resource. Spotted by Eric Brower. Signed-off-by: David S. Miller <davem@davemloft.net>
* [PATCH] sparc32: add offset in pci_map_sg()Jan Andersson2006-12-30
| | | | | | | | | | | | Add sg->offset to sg->dvma_address in pci_map_sg() on sparc32. Without the offset, transfers to buffers that do not begin on a page boundary will not work as expected. Signed-off-by: Jan Andersson <jan.andersson@ieee.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: William Lee Irwin III <wli@holomorphy.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [SPARC]: Make bitops use same spinlocks as atomics.David S. Miller2006-12-17
| | | | | | | | | Recent workqueue changes basically make this a formal requirement. Also, move atomic32.o from lib-y to obj-y since it exports symbols to modules. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Update defconfig.David S. Miller2006-12-17
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [PATCH] getting rid of all casts of k[cmz]alloc() callsRobert P. J. Day2006-12-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Run this: #!/bin/sh for f in $(grep -Erl "\([^\)]*\) *k[cmz]alloc" *) ; do echo "De-casting $f..." perl -pi -e "s/ ?= ?\([^\)]*\) *(k[cmz]alloc) *\(/ = \1\(/" $f done And then go through and reinstate those cases where code is casting pointers to non-pointers. And then drop a few hunks which conflicted with outstanding work. Cc: Russell King <rmk@arm.linux.org.uk>, Ian Molton <spyro@f2s.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Greg KH <greg@kroah.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Paul Fulghum <paulkf@microgate.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Karsten Keil <kkeil@suse.de> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Cc: Jeff Garzik <jeff@garzik.org> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Ian Kent <raven@themaw.net> Cc: Steven French <sfrench@us.ibm.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Neil Brown <neilb@cse.unsw.edu.au> Cc: Jaroslav Kysela <perex@suse.cz> Cc: Takashi Iwai <tiwai@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [SPARC{32,64}]: Propagate ptrace_traceme() return value.Alexey Dobriyan2006-12-10
| | | | | | | | | | | ptrace_traceme() consolidation made ret = ptrace_traceme(); dead write. Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Check kzalloc() return value in SUN4D irq/iommu init.David S. Miller2006-12-10
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Replace kmalloc+memset with kzallocYan Burman2006-12-10
| | | | | | | Replace kmalloc+memset with kzalloc Signed-off-by: Yan Burman <burman.yan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [PATCH] LOG2: Implement a general integer log2 facility in the kernelDavid Howells2006-12-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This facility provides three entry points: ilog2() Log base 2 of unsigned long ilog2_u32() Log base 2 of u32 ilog2_u64() Log base 2 of u64 These facilities can either be used inside functions on dynamic data: int do_something(long q) { ...; y = ilog2(x) ...; } Or can be used to statically initialise global variables with constant values: unsigned n = ilog2(27); When performing static initialisation, the compiler will report "error: initializer element is not constant" if asked to take a log of zero or of something not reducible to a constant. They treat negative numbers as unsigned. When not dealing with a constant, they fall back to using fls() which permits them to use arch-specific log calculation instructions - such as BSR on x86/x86_64 or SCAN on FRV - if available. [akpm@osdl.org: MMC fix] Signed-off-by: David Howells <dhowells@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: David Howells <dhowells@redhat.com> Cc: Wojtek Kaniewski <wojtekka@toxygen.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>