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Message-Id: <1422108218-25398-1-git-send-email-tj@kernel.org> Date: Sat, 24 Jan 2015 09:03:06 -0500 From: Tejun Heo <tj@...nel.org> To: akpm@...ux-foundation.org Cc: linux-kernel@...r.kernel.org Subject: [PATCHSET] bitmap, cpumask, nodemask: implement %*pb[l] to format bitmaps directly from printf family of functions Hello, bitmap implements two variants of scnprintf functions to format a bitmap into a string and cpumask and nodemask wrap them to provide equivalent interfaces. The scnprintf family of functions require a string buffer as an output target which complicates code paths which just want to print out the mask through printk for informational or debug purposes as they have to worry about how large the buffer should be and whether it's too large to allocate on stack. Neither cpumask or nodemask provides a guildeline on how large the target buffer should be forcing users come up with their own solutions - some allocate an arbitrarily sized buffer which is small enough to allocate on stack but may be too short in corner cases, other come up with a custom upper limit calculation considering the output format, some allocate the buffer dynamically while one resorted to using lock to synchronize access to a static buffer. This is an artificial problem which is being solved repeatedly for no benefit. In a lot of cases, the output area already exists and can be targeted directly making the intermediate buffer unnecessary. This patchset teaches printf family of functions how to format bitmaps and replace the dedicated formatting functions with it. Pointer formatting is extended to cover bitmap formatting. It uses the field width for the number of bits instead of precision. The format used is '%*pb[l]', with the optional trailing 'l' specifying list format instead of hex masks. For more details, please see 0002. This patchset contains the following 32 patches. 0001-cpumask-always-use-nr_cpu_ids-in-formatting-and-pars.patch 0002-lib-vsprintf-implement-bitmap-printing-through-pb-l.patch 0003-cpumask-nodemask-implement-cpumask-nodemask_pr_args.patch 0004-bitmap-use-pb-l-to-print-bitmaps-including-cpumasks-.patch 0005-mips-use-pb-l-to-print-bitmaps-including-cpumasks-an.patch 0006-powerpc-use-pb-l-to-print-bitmaps-including-cpumasks.patch 0007-s390-use-pb-l-to-print-bitmaps-including-cpumasks-an.patch 0008-tile-use-pb-l-to-print-bitmaps-including-cpumasks-an.patch 0009-x86-use-pb-l-to-print-bitmaps-including-cpumasks-and.patch 0010-ia64-use-pb-l-to-print-bitmaps-including-cpumasks-an.patch 0011-xtensa-use-pb-l-to-print-bitmaps-including-cpumasks-.patch 0012-arm-use-pb-l-to-print-bitmaps-including-cpumasks-and.patch 0013-cpuset-use-pb-l-to-print-bitmaps-including-cpumasks-.patch 0014-rcu-use-pb-l-to-print-bitmaps-including-cpumasks-and.patch 0015-sched-use-pb-l-to-print-bitmaps-including-cpumasks-a.patch 0016-time-use-pb-l-to-print-bitmaps-including-cpumasks-an.patch 0017-percpu-use-pb-l-to-print-bitmaps-including-cpumasks-.patch 0018-workqueue-use-pb-l-to-format-bitmaps-including-cpuma.patch 0019-tracing-use-pb-l-to-print-bitmaps-including-cpumasks.patch 0020-net-use-pb-l-to-print-bitmaps-including-cpumasks-and.patch 0021-wireless-use-pb-l-to-print-bitmaps-including-cpumask.patch 0022-input-use-pb-l-to-print-bitmaps-including-cpumasks-a.patch 0023-scsi-use-pb-l-to-print-bitmaps-including-cpumasks-an.patch 0024-usb-use-pb-l-to-print-bitmaps-including-cpumasks-and.patch 0025-drivers-base-use-pb-l-to-print-bitmaps-including-cpu.patch 0026-slub-use-pb-l-to-print-bitmaps-including-cpumasks-an.patch 0027-mm-use-pb-l-to-print-bitmaps-including-cpumasks-and-.patch 0028-padata-use-pb-l-to-print-bitmaps-including-cpumasks-.patch 0029-proc-use-pb-l-to-print-bitmaps-including-cpumasks-an.patch 0030-irq-use-pb-l-to-print-bitmaps-including-cpumasks-and.patch 0031-profile-use-pb-l-to-print-bitmaps-including-cpumasks.patch 0032-bitmap-cpumask-nodemask-remove-dedicated-formatting-.patch 0001 removes inconsistency in cpumask formatting and parsing. 0002 implements '%*pb[l]' formatting. 0003 implements cpumask/nodemask_pr_args() macros. 0004-0031 convert existing users of the dedicated formatting functions to use '%*pb[l]'. 0032 removes the dedicated formatting functions. If we can agree on this approach, it'd be best to route 0001-0003 through mainline ASAP and then route the rest through respective susbsystems. The patchset is also available in the following git branch. git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git review-bitmap-print diffstat follows. Around -300 LOC. arch/ia64/kernel/topology.c | 6 - arch/mips/netlogic/common/smp.c | 13 +-- arch/powerpc/kernel/cacheinfo.c | 15 +-- arch/powerpc/sysdev/xics/ics-opal.c | 6 - arch/powerpc/sysdev/xics/ics-rtas.c | 7 - arch/s390/kernel/cache.c | 9 +- arch/tile/kernel/hardwall.c | 5 - arch/tile/kernel/proc.c | 5 - arch/tile/kernel/setup.c | 13 +-- arch/tile/mm/homecache.c | 12 +- arch/tile/mm/init.c | 18 +--- arch/x86/kernel/cpu/intel_cacheinfo.c | 26 ++---- arch/x86/mm/numa.c | 6 - arch/x86/platform/uv/uv_nmi.c | 25 +----- arch/xtensa/kernel/setup.c | 7 - drivers/base/cpu.c | 2 drivers/base/node.c | 3 drivers/bus/arm-cci.c | 4 drivers/input/keyboard/atkbd.c | 4 drivers/input/keyboard/gpio_keys.c | 2 drivers/net/ethernet/tile/tilegx.c | 5 - drivers/net/ethernet/tile/tilepro.c | 5 - drivers/net/wireless/ath/ath9k/htc_drv_debug.c | 23 +---- drivers/net/wireless/ath/carl9170/debug.c | 24 +---- drivers/scsi/scsi_debug.c | 6 - drivers/usb/host/whci/debug.c | 7 - drivers/usb/wusbcore/reservation.c | 5 - drivers/usb/wusbcore/wa-rpipe.c | 5 - drivers/usb/wusbcore/wusbhc.c | 7 - drivers/uwb/drp.c | 2 drivers/uwb/uwb-debug.c | 16 +-- fs/proc/array.c | 10 -- fs/seq_file.c | 32 ------- include/linux/bitmap.h | 7 - include/linux/cpumask.h | 49 +++--------- include/linux/nodemask.h | 41 +++------- include/linux/seq_buf.h | 3 include/linux/seq_file.h | 25 ------ kernel/cpuset.c | 42 ++-------- kernel/irq/proc.c | 11 -- kernel/padata.c | 11 -- kernel/profile.c | 3 kernel/rcu/tree_plugin.h | 5 - kernel/sched/core.c | 10 -- kernel/sched/stats.c | 11 -- kernel/time/tick-sched.c | 11 -- kernel/trace/trace.c | 6 - kernel/trace/trace_seq.c | 2 kernel/workqueue.c | 5 - lib/bitmap.c | 102 ------------------------- lib/seq_buf.c | 36 -------- lib/vsprintf.c | 94 +++++++++++++++++++++++ mm/mempolicy.c | 7 - mm/percpu.c | 6 - mm/slub.c | 20 +--- net/core/net-sysfs.c | 28 +----- net/core/sysctl_net_core.c | 2 57 files changed, 288 insertions(+), 584 deletions(-) -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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