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182dd4b277
An IRC discussion uncovered many conflicting opinions on what types of data may be atomically loaded and stored. This commit therefore calls this out the official set: pointers, longs, ints, and chars (but not shorts). This commit also gives some examples of compiler mischief that can thwart atomicity. Please note that this discussion is relevant to !SMP kernels if CONFIG_PREEMPT=y: preemption can cause almost as much trouble as can SMP. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Mikael Starvik <starvik@axis.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: David Howells <dhowells@redhat.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Jes Sorensen <jes@sgi.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Cc: Jonas Bonn <jonas@southpole.se> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Helge Deller <deller@gmx.de> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Chen Liqin <liqin.chen@sunplusct.com> Cc: Lennox Wu <lennox.wu@gmail.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Chris Zankel <chris@zankel.net> |
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| .. | ||
| ABI | ||
| accounting | ||
| acpi | ||
| aoe | ||
| arm | ||
| auxdisplay | ||
| blackfin | ||
| block | ||
| blockdev | ||
| cdrom | ||
| cgroups | ||
| connector | ||
| console | ||
| cpu-freq | ||
| cpuidle | ||
| cris | ||
| crypto | ||
| development-process | ||
| device-mapper | ||
| devicetree | ||
| DocBook | ||
| driver-model | ||
| dvb | ||
| early-userspace | ||
| fault-injection | ||
| fb | ||
| filesystems | ||
| firmware_class | ||
| frv | ||
| hid | ||
| hwmon | ||
| i2c | ||
| i2o | ||
| ia64 | ||
| ide | ||
| infiniband | ||
| input | ||
| ioctl | ||
| isdn | ||
| ja_JP | ||
| kbuild | ||
| kdump | ||
| ko_KR | ||
| laptops | ||
| leds | ||
| m68k | ||
| make | ||
| mips | ||
| misc-devices | ||
| mmc | ||
| mn10300 | ||
| mtd | ||
| namespaces | ||
| netlabel | ||
| networking | ||
| nfc | ||
| parisc | ||
| PCI | ||
| pcmcia | ||
| power | ||
| powerpc | ||
| pps | ||
| prctl | ||
| pti | ||
| ptp | ||
| rapidio | ||
| RCU | ||
| s390 | ||
| scheduler | ||
| scsi | ||
| security | ||
| serial | ||
| sh | ||
| sound | ||
| sparc | ||
| spi | ||
| sysctl | ||
| target | ||
| telephony | ||
| thermal | ||
| timers | ||
| trace | ||
| usb | ||
| vDSO | ||
| video4linux | ||
| virtual | ||
| vm | ||
| w1 | ||
| watchdog | ||
| wimax | ||
| x86 | ||
| zh_CN | ||
| .gitignore | ||
| 00-INDEX | ||
| applying-patches.txt | ||
| atomic_ops.txt | ||
| bad_memory.txt | ||
| basic_profiling.txt | ||
| binfmt_misc.txt | ||
| braille-console.txt | ||
| bt8xxgpio.txt | ||
| btmrvl.txt | ||
| BUG-HUNTING | ||
| bus-virt-phys-mapping.txt | ||
| cachetlb.txt | ||
| Changes | ||
| circular-buffers.txt | ||
| coccinelle.txt | ||
| CodingStyle | ||
| cpu-hotplug.txt | ||
| cpu-load.txt | ||
| cputopology.txt | ||
| dcdbas.txt | ||
| debugging-modules.txt | ||
| debugging-via-ohci1394.txt | ||
| dell_rbu.txt | ||
| devices.txt | ||
| DMA-API-HOWTO.txt | ||
| DMA-API.txt | ||
| DMA-attributes.txt | ||
| DMA-ISA-LPC.txt | ||
| dmaengine.txt | ||
| dontdiff | ||
| dynamic-debug-howto.txt | ||
| edac.txt | ||
| eisa.txt | ||
| email-clients.txt | ||
| feature-removal-schedule.txt | ||
| flexible-arrays.txt | ||
| futex-requeue-pi.txt | ||
| gcov.txt | ||
| gpio.txt | ||
| highuid.txt | ||
| HOWTO | ||
| hw_random.txt | ||
| hwspinlock.txt | ||
| init.txt | ||
| initrd.txt | ||
| Intel-IOMMU.txt | ||
| intel_txt.txt | ||
| io-mapping.txt | ||
| io_ordering.txt | ||
| iostats.txt | ||
| IPMI.txt | ||
| IRQ-affinity.txt | ||
| IRQ.txt | ||
| irqflags-tracing.txt | ||
| isapnp.txt | ||
| java.txt | ||
| kernel-doc-nano-HOWTO.txt | ||
| kernel-docs.txt | ||
| kernel-parameters.txt | ||
| kmemcheck.txt | ||
| kmemleak.txt | ||
| kobject.txt | ||
| kprobes.txt | ||
| kref.txt | ||
| ldm.txt | ||
| local_ops.txt | ||
| lockdep-design.txt | ||
| lockstat.txt | ||
| logo.gif | ||
| logo.txt | ||
| magic-number.txt | ||
| Makefile | ||
| ManagementStyle | ||
| mca.txt | ||
| md.txt | ||
| media-framework.txt | ||
| memory-barriers.txt | ||
| memory-hotplug.txt | ||
| memory.txt | ||
| mono.txt | ||
| mutex-design.txt | ||
| nmi_watchdog.txt | ||
| nommu-mmap.txt | ||
| numastat.txt | ||
| oops-tracing.txt | ||
| padata.txt | ||
| parport-lowlevel.txt | ||
| parport.txt | ||
| pi-futex.txt | ||
| pinctrl.txt | ||
| pnp.txt | ||
| preempt-locking.txt | ||
| printk-formats.txt | ||
| prio_tree.txt | ||
| ramoops.txt | ||
| rbtree.txt | ||
| rfkill.txt | ||
| robust-futex-ABI.txt | ||
| robust-futexes.txt | ||
| rt-mutex-design.txt | ||
| rt-mutex.txt | ||
| rtc.txt | ||
| SAK.txt | ||
| SecurityBugs | ||
| serial-console.txt | ||
| sgi-ioc4.txt | ||
| sgi-visws.txt | ||
| SM501.txt | ||
| sparse.txt | ||
| spinlocks.txt | ||
| stable_api_nonsense.txt | ||
| stable_kernel_rules.txt | ||
| SubmitChecklist | ||
| SubmittingDrivers | ||
| SubmittingPatches | ||
| svga.txt | ||
| sysfs-rules.txt | ||
| sysrq.txt | ||
| unaligned-memory-access.txt | ||
| unicode.txt | ||
| unshare.txt | ||
| VGA-softcursor.txt | ||
| vgaarbiter.txt | ||
| video-output.txt | ||
| volatile-considered-harmful.txt | ||
| workqueue.txt | ||
| xz.txt | ||
| zorro.txt | ||
