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* clocksource/drivers/nomadik_mtu: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-2/+2
| | | | | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Due to the non portable code for the delay timer, this option is only available for the ARM architecture. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/lpc32xx: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+3
| | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/asm9260: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+3
| | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/cadence_ttc: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+4
| | | | | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. The driver depends on the common clock framework, thus the dependency added on COMMON_CLK. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/vt8500: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+3
| | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/vt8500: Remove unneeded headerDaniel Lezcano2015-12-151-1/+0
| | | | | | Remove the <asm/time.h> header inclusion which is pointless. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/tegra2: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+4
| | | | | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Due to the non portable code for the delay timer, this option is only available for the ARM architecture. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/sun5i: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+4
| | | | | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. The driver depends on the common clock framework, thus the dependency added on COMMON_CLK. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/sun4i: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+3
| | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/dw_apb: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+3
| | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/digicolor: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+3
| | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/orion: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+4
| | | | | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. The driver is using the atomic_io API which is not portable, so the compilation is restricted to ARM only. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/meson6: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+3
| | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/armada-370-xp: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+4
| | | | | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Due to the non portable 'delay' code, the compilation is restricted to the ARM architecture only. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/rockchip: Add COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+4
| | | | | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Due to the dsb() usage in the driver, this driver is only compilable on ARM and ARM64. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/mediatek: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+3
| | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/pistachio: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+3
| | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/tango: Add COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+4
| | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/pxa_timer: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+3
| | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/pxa_timer: Move the Kconfig ruleDaniel Lezcano2015-12-152-2/+4
| | | | | | | | | | Instead of having the clocksource's Kconfig depending on the arch, let the arch to select the timer it needs. The CLKSRC_OF dependency is removed because already selected by the ARCH_PXA, and it is added for SA1100. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/st_lpc: Add the COMPILE_TEST optionDaniel Lezcano2015-12-151-1/+1
| | | | | | Increase the compilation test coverage by adding the COMPILE_TEST option. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/st_lpc: Fix Kconfig dependencyDaniel Lezcano2015-12-152-1/+1
| | | | | | | | Change the Kconfig selection rule by letting the STI arch to select the timer. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Maxime Coquelin <maxime.coquelin@st.com>
* clocksource/drivers/qcom: Make COMPILE_TEST enabled for ARM architectureDaniel Lezcano2015-12-151-1/+6
| | | | | | | | | In order to be consistent with the rest of the drivers compilation, let's introduce the COMPILE_TEST option. Unfortunately, the delay.h code is not portable, so the compilation test coverage will be restricted to the ARM architecture. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/rockchip: Remove dsb() usageCaesar Wang2015-12-151-4/+0
| | | | | | | | | | | The dsb() instruction is pointless in this code. Remove it. That also fixes the ARM64 compilation issue. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Tested-by: Caesar Wang <wxt@rock-chips.com>
* time: Define dummy functions for the generic sched clockDaniel Lezcano2015-12-151-3/+9
| | | | | | | | | | | | | | | | When we try to compile a clocksource driver with the COMPILE_TEST option, we can't select the GENERIC_SCHED_CLOCK because the sched_clock() symbol will be duplicated with the one defined for the x86. In order to fix that, we don't select the GENERIC_SCHED_CLOCK in the driver Kconfig's file but we define some empty functions for the different symbols in order to prevent the unresolved ones. This patch fixes the COMPILE_TEST option for the compile test coverage for the clocksource drivers. Without this patch, we can't add the COMPILE_TEST option for the clocksource drivers using the GENERIC_SCHED_CLOCK. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/rockchip: Make the driver more readableCaesar Wang2015-12-151-9/+10
| | | | | | | Let's checkstyle to clean up the macros with such trivial details. Signed-off-by: Caesar Wang <wxt@rock-chips.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/tegra: Allow timer irq affinity changeLucas Stach2015-12-151-1/+2
| | | | | | | | | | | Allow the timer core to change the smp affinity of the broadcast timer irq by setting CLOCK_EVT_FEAT_DYNIRQ flag. This reduces interrupt pressure and wakeups on CPU0 as well as vastly reducing the number of timer broadcast IPIs. Signed-off-by: Lucas Stach <dev@lynxeye.de> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/mtk_timer: Fix memleak in mtk_timer_init()Alexey Klimov2015-12-151-1/+3
| | | | | | | | | Add error path to clear evt struct allocated by kzalloc() in the beginning of function mtk_timer_init(). Acked-by: Matthias Brugger <matthias.bgg@gmail.com> Signed-off-by: Alexey Klimov <alexey.klimov@linaro.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/mtk_timer: Fix pr_warn() messages in mtk_timer_initAlexey Klimov2015-12-151-8/+6
| | | | | | | | | | | 1) Change pr_warn()s to pr_err()s. These messages are actually errors and not warnings. 2) Add missing \n. 3) Error message for kzalloc() failure is removed per suggestion by Joe Perches. There is generic stack_dump() for allocation issues. Signed-off-by: Alexey Klimov <alexey.klimov@linaro.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* clocksource/drivers/mtk_timer: Add pr_fmt defineAlexey Klimov2015-12-151-0/+2
| | | | | | | | | | It's a bit unclear what subsystem/driver emits some messages to dmesg in the function mtk_init_timer(). Use pr_fmt to auto-prefix the messages appropriately. Acked-by: Matthias Brugger <matthias.bgg@gmail.com> Signed-off-by: Alexey Klimov <alexey.klimov@linaro.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
* nohz: Clarify magic in tick_nohz_stop_sched_tick()Peter Zijlstra2015-11-251-2/+18
| | | | | | | | | | | | While going through the nohz code I got stumped by some of it. This patch adds a few comments clarifying the code; based on discussion with Thomas. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/20151119162106.GO3816@twins.programming.kicks-ass.net Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* timekeeping: Lift clocksource cacheline restrictionThomas Gleixner2015-11-251-5/+11
| | | | | | | | | | | | | | | | | | | | | We cache all hotpath members of a clocksource in the time keeper core. So there is no requirement in general to cache line align struct clocksource. Remove the enforces alignment. That allows users which need to wrap struct clocksource into their own struct to align the struct without getting extra padding. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Russell King - ARM Linux <linux@arm.linux.org.uk> Cc: Marc Gonzalez <marc_gonzalez@sigmadesigns.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Mans Rullgard <mans@mansr.com> Cc: Viresh Kumar <viresh.kumar@linaro.org> Cc: Nicolas Pitre <nico@linaro.org> Cc: Tony Lindgren <tony@atomide.com> Cc: Sebastian Frias <sebastian_frias@sigmadesigns.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1511191209000.3898@nanos
* Linux 4.4-rc2v4.4-rc2Linus Torvalds2015-11-231-1/+1
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* Merge branch 'akpm' (patches from Andrew)Linus Torvalds2015-11-236-76/+182
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Merge slub bulk allocator updates from Andrew Morton: "This missed the merge window because I was waiting for some repairs to come in. Nothing actually uses the bulk allocator yet and the changes to other code paths are pretty small. And the net guys are waiting for this so they can start merging the client code" More comments from Jesper Dangaard Brouer: "The kmem_cache_alloc_bulk() call, in mm/slub.c, were included in previous kernel. The present version contains a bug. Vladimir Davydov noticed it contained a bug, when kernel is compiled with CONFIG_MEMCG_KMEM (see commit 03ec0ed57ffc: "slub: fix kmem cgroup bug in kmem_cache_alloc_bulk"). Plus the mem cgroup counterpart in kmem_cache_free_bulk() were missing (see commit 033745189b1b "slub: add missing kmem cgroup support to kmem_cache_free_bulk"). I don't consider the fix stable-material because there are no in-tree users of the API. But with known bugs (for memcg) I cannot start using the API in the net-tree" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: slab/slub: adjust kmem_cache_alloc_bulk API slub: add missing kmem cgroup support to kmem_cache_free_bulk slub: fix kmem cgroup bug in kmem_cache_alloc_bulk slub: optimize bulk slowpath free by detached freelist slub: support for bulk free with SLUB freelists
| * slab/slub: adjust kmem_cache_alloc_bulk APIJesper Dangaard Brouer2015-11-226-11/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Adjust kmem_cache_alloc_bulk API before we have any real users. Adjust API to return type 'int' instead of previously type 'bool'. This is done to allow future extension of the bulk alloc API. A future extension could be to allow SLUB to stop at a page boundary, when specified by a flag, and then return the number of objects. The advantage of this approach, would make it easier to make bulk alloc run without local IRQs disabled. With an approach of cmpxchg "stealing" the entire c->freelist or page->freelist. To avoid overshooting we would stop processing at a slab-page boundary. Else we always end up returning some objects at the cost of another cmpxchg. To keep compatible with future users of this API linking against an older kernel when using the new flag, we need to return the number of allocated objects with this API change. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Cc: Vladimir Davydov <vdavydov@virtuozzo.com> Acked-by: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * slub: add missing kmem cgroup support to kmem_cache_free_bulkJesper Dangaard Brouer2015-11-221-1/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Initial implementation missed support for kmem cgroup support in kmem_cache_free_bulk() call, add this. If CONFIG_MEMCG_KMEM is not enabled, the compiler should be smart enough to not add any asm code. Incoming bulk free objects can belong to different kmem cgroups, and object free call can happen at a later point outside memcg context. Thus, we need to keep the orig kmem_cache, to correctly verify if a memcg object match against its "root_cache" (s->memcg_params.root_cache). Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * slub: fix kmem cgroup bug in kmem_cache_alloc_bulkJesper Dangaard Brouer2015-11-221-18/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The call slab_pre_alloc_hook() interacts with kmemgc and is not allowed to be called several times inside the bulk alloc for loop, due to the call to memcg_kmem_get_cache(). This would result in hitting the VM_BUG_ON in __memcg_kmem_get_cache. As suggested by Vladimir Davydov, change slab_post_alloc_hook() to be able to handle an array of objects. A subtle detail is, loop iterator "i" in slab_post_alloc_hook() must have same type (size_t) as size argument. This helps the compiler to easier realize that it can remove the loop, when all debug statements inside loop evaluates to nothing. Note, this is only an issue because the kernel is compiled with GCC option: -fno-strict-overflow In slab_alloc_node() the compiler inlines and optimizes the invocation of slab_post_alloc_hook(s, flags, 1, &object) by removing the loop and access object directly. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Reported-by: Vladimir Davydov <vdavydov@virtuozzo.com> Suggested-by: Vladimir Davydov <vdavydov@virtuozzo.com> Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * slub: optimize bulk slowpath free by detached freelistJesper Dangaard Brouer2015-11-221-30/+79
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This change focus on improving the speed of object freeing in the "slowpath" of kmem_cache_free_bulk. The calls slab_free (fastpath) and __slab_free (slowpath) have been extended with support for bulk free, which amortize the overhead of the (locked) cmpxchg_double. To use the new bulking feature, we build what I call a detached freelist. The detached freelist takes advantage of three properties: 1) the free function call owns the object that is about to be freed, thus writing into this memory is synchronization-free. 2) many freelist's can co-exist side-by-side in the same slab-page each with a separate head pointer. 3) it is the visibility of the head pointer that needs synchronization. Given these properties, the brilliant part is that the detached freelist can be constructed without any need for synchronization. The freelist is constructed directly in the page objects, without any synchronization needed. The detached freelist is allocated on the stack of the function call kmem_cache_free_bulk. Thus, the freelist head pointer is not visible to other CPUs. All objects in a SLUB freelist must belong to the same slab-page. Thus, constructing the detached freelist is about matching objects that belong to the same slab-page. The bulk free array is scanned is a progressive manor with a limited look-ahead facility. Kmem debug support is handled in call of slab_free(). Notice kmem_cache_free_bulk no longer need to disable IRQs. This only slowed down single free bulk with approx 3 cycles. Performance data: Benchmarked[1] obj size 256 bytes on CPU i7-4790K @ 4.00GHz SLUB fastpath single object quick reuse: 47 cycles(tsc) 11.931 ns To get stable and comparable numbers, the kernel have been booted with "slab_merge" (this also improve performance for larger bulk sizes). Performance data, compared against fallback bulking: bulk - fallback bulk - improvement with this patch 1 - 62 cycles(tsc) 15.662 ns - 49 cycles(tsc) 12.407 ns- improved 21.0% 2 - 55 cycles(tsc) 13.935 ns - 30 cycles(tsc) 7.506 ns - improved 45.5% 3 - 53 cycles(tsc) 13.341 ns - 23 cycles(tsc) 5.865 ns - improved 56.6% 4 - 52 cycles(tsc) 13.081 ns - 20 cycles(tsc) 5.048 ns - improved 61.5% 8 - 50 cycles(tsc) 12.627 ns - 18 cycles(tsc) 4.659 ns - improved 64.0% 16 - 49 cycles(tsc) 12.412 ns - 17 cycles(tsc) 4.495 ns - improved 65.3% 30 - 49 cycles(tsc) 12.484 ns - 18 cycles(tsc) 4.533 ns - improved 63.3% 32 - 50 cycles(tsc) 12.627 ns - 18 cycles(tsc) 4.707 ns - improved 64.0% 34 - 96 cycles(tsc) 24.243 ns - 23 cycles(tsc) 5.976 ns - improved 76.0% 48 - 83 cycles(tsc) 20.818 ns - 21 cycles(tsc) 5.329 ns - improved 74.7% 64 - 74 cycles(tsc) 18.700 ns - 20 cycles(tsc) 5.127 ns - improved 73.0% 128 - 90 cycles(tsc) 22.734 ns - 27 cycles(tsc) 6.833 ns - improved 70.0% 158 - 99 cycles(tsc) 24.776 ns - 30 cycles(tsc) 7.583 ns - improved 69.7% 250 - 104 cycles(tsc) 26.089 ns - 37 cycles(tsc) 9.280 ns - improved 64.4% Performance data, compared current in-kernel bulking: bulk - curr in-kernel - improvement with this patch 1 - 46 cycles(tsc) - 49 cycles(tsc) - improved (cycles:-3) -6.5% 2 - 27 cycles(tsc) - 30 cycles(tsc) - improved (cycles:-3) -11.1% 3 - 21 cycles(tsc) - 23 cycles(tsc) - improved (cycles:-2) -9.5% 4 - 18 cycles(tsc) - 20 cycles(tsc) - improved (cycles:-2) -11.1% 8 - 17 cycles(tsc) - 18 cycles(tsc) - improved (cycles:-1) -5.9% 16 - 18 cycles(tsc) - 17 cycles(tsc) - improved (cycles: 1) 5.6% 30 - 18 cycles(tsc) - 18 cycles(tsc) - improved (cycles: 0) 0.0% 32 - 18 cycles(tsc) - 18 cycles(tsc) - improved (cycles: 0) 0.0% 34 - 78 cycles(tsc) - 23 cycles(tsc) - improved (cycles:55) 70.5% 48 - 60 cycles(tsc) - 21 cycles(tsc) - improved (cycles:39) 65.0% 64 - 49 cycles(tsc) - 20 cycles(tsc) - improved (cycles:29) 59.2% 128 - 69 cycles(tsc) - 27 cycles(tsc) - improved (cycles:42) 60.9% 158 - 79 cycles(tsc) - 30 cycles(tsc) - improved (cycles:49) 62.0% 250 - 86 cycles(tsc) - 37 cycles(tsc) - improved (cycles:49) 57.0% Performance with normal SLUB merging is significantly slower for larger bulking. This is believed to (primarily) be an effect of not having to share the per-CPU data-structures, as tuning per-CPU size can achieve similar performance. bulk - slab_nomerge - normal SLUB merge 1 - 49 cycles(tsc) - 49 cycles(tsc) - merge slower with cycles:0 2 - 30 cycles(tsc) - 30 cycles(tsc) - merge slower with cycles:0 3 - 23 cycles(tsc) - 23 cycles(tsc) - merge slower with cycles:0 4 - 20 cycles(tsc) - 20 cycles(tsc) - merge slower with cycles:0 8 - 18 cycles(tsc) - 18 cycles(tsc) - merge slower with cycles:0 16 - 17 cycles(tsc) - 17 cycles(tsc) - merge slower with cycles:0 30 - 18 cycles(tsc) - 23 cycles(tsc) - merge slower with cycles:5 32 - 18 cycles(tsc) - 22 cycles(tsc) - merge slower with cycles:4 34 - 23 cycles(tsc) - 22 cycles(tsc) - merge slower with cycles:-1 48 - 21 cycles(tsc) - 22 cycles(tsc) - merge slower with cycles:1 64 - 20 cycles(tsc) - 48 cycles(tsc) - merge slower with cycles:28 128 - 27 cycles(tsc) - 57 cycles(tsc) - merge slower with cycles:30 158 - 30 cycles(tsc) - 59 cycles(tsc) - merge slower with cycles:29 250 - 37 cycles(tsc) - 56 cycles(tsc) - merge slower with cycles:19 Joint work with Alexander Duyck. [1] https://github.com/netoptimizer/prototype-kernel/blob/master/kernel/mm/slab_bulk_test01.c [akpm@linux-foundation.org: BUG_ON -> WARN_ON;return] Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com> Acked-by: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * slub: support for bulk free with SLUB freelistsJesper Dangaard Brouer2015-11-221-18/+67
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make it possible to free a freelist with several objects by adjusting API of slab_free() and __slab_free() to have head, tail and an objects counter (cnt). Tail being NULL indicate single object free of head object. This allow compiler inline constant propagation in slab_free() and slab_free_freelist_hook() to avoid adding any overhead in case of single object free. This allows a freelist with several objects (all within the same slab-page) to be free'ed using a single locked cmpxchg_double in __slab_free() and with an unlocked cmpxchg_double in slab_free(). Object debugging on the free path is also extended to handle these freelists. When CONFIG_SLUB_DEBUG is enabled it will also detect if objects don't belong to the same slab-page. These changes are needed for the next patch to bulk free the detached freelists it introduces and constructs. Micro benchmarking showed no performance reduction due to this change, when debugging is turned off (compiled with CONFIG_SLUB_DEBUG). Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com> Acked-by: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Merge tag 'tty-4.4-rc2' of ↵Linus Torvalds2015-11-2311-13/+15
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty Pull tty/serial fixes from Greg KH: "Here are a few small tty/serial driver fixes for 4.4-rc2 that resolve some reported problems. All have been in linux-next, full details are in the shortlog below" * tag 'tty-4.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: serial: export fsl8250_handle_irq serial: 8250_mid: Add missing dependency tty: audit: Fix audit source serial: etraxfs-uart: Fix crash serial: fsl_lpuart: Fix earlycon support bcm63xx_uart: Use the device name when registering an interrupt tty: Fix direct use of tty buffer work tty: Fix tty_send_xchar() lock order inversion
| * | serial: export fsl8250_handle_irqArnd Bergmann2015-11-211-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | fsl8250_handle_irq is now used by the of_serial driver, and that fails if it is a loadable module: ERROR: "fsl8250_handle_irq" [drivers/tty/serial/of_serial.ko] undefined! This exports the symbol to avoid randconfig errors. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: d43b54d269d2 ("serial: Enable Freescale 16550 workaround on arm") Cc: Scott Wood <scottwood@freescale.com> Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | serial: 8250_mid: Add missing dependencyHeikki Krogerus2015-11-211-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 8250_mid uses rational_best_approximation() function, so the driver needs to select CONFIG_RATIONAL option. This fixes build error when CONFIG_RATIONAL is not enabled: drivers/built-in.o: In function `mid8250_set_termios': 8250_mid.c:(.text+0x10169a): undefined reference to `rational_best_approximation' Reported-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: audit: Fix audit sourcePeter Hurley2015-11-213-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The data to audit/record is in the 'from' buffer (ie., the input read buffer). Fixes: 72586c6061ab ("n_tty: Fix auditing support for cannonical mode") Cc: stable <stable@vger.kernel.org> # 4.1+ Cc: Miloslav Trmač <mitr@redhat.com> Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Acked-by: Laura Abbott <labbott@fedoraproject.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | serial: etraxfs-uart: Fix crashGuenter Roeck2015-11-211-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since commit 7d8c70d8048c ("serial: mctrl-gpio: rename init function"), crisv32 either do not build or crash as follows. Unable to handle kernel NULL pointer dereference Linux 4.3.0-rc7-next-20151101 #1 Sun Nov 1 11:41:28 PST 2015 ... Call Trace: [<c0004a0e>] show_stack+0x0/0x9e [<c004c0c0>] printk+0x0/0x2c [<c00059d4>] show_registers+0x14a/0x1c2 [<c004c0c0>] printk+0x0/0x2c [<c0004b52>] die_if_kernel+0x7c/0x9e [<c0005346>] do_page_fault+0x32e/0x3e6 [<c01dc59c>] of_get_property+0x0/0x2c [<c01e0558>] of_irq_parse_raw+0x12a/0x376 [<c01dc59c>] of_get_property+0x0/0x2c [<c0053aca>] get_page_from_freelist+0x73e/0x856 [<c01dc59c>] of_get_property+0x0/0x2c [<c0008912>] d_mmu_refill+0x10a/0x112 [<c01b488c>] devm_kmalloc+0x40/0x56 [<c01b47d0>] add_dr+0xc/0x1c [<c01b4800>] devm_add_action+0x2/0x4e [<c01abdbc>] mctrl_gpio_init_noauto+0x1c/0x76 [<c01abf9e>] mctrl_gpio_init+0x22/0x110 The function call in the etraxfs-uart driver was not renamed, possibly due to interference with commit 7b9c5162c182 ("serial: etraxfs-uart: use mctrl_gpio helpers for handling modem signals"). Fixes: 7d8c70d8048c ("serial: mctrl-gpio: rename init function") Signed-off-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Niklas Cassel <nks@flawful.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | serial: fsl_lpuart: Fix earlycon supportPeter Hurley2015-11-211-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Earlycon support for Freescale lpuart should only be enabled when console support is enabled. Fixes: 1d59b382f1c4 ("serial: fsl_lpuart: add earlycon support") Acked-by: Stefan Agner <stefan@agner.ch> Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | bcm63xx_uart: Use the device name when registering an interruptSimon Arlott2015-11-211-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | Use the device name when registering an interrupt so that multiple ports don't all have the same interrupt name. Signed-off-by: Simon Arlott <simon@fire.lp0.eu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: Fix direct use of tty buffer workPeter Hurley2015-11-211-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | Recent abstraction of tty buffer work introduced api to manage tty input kworker; use it. Fixes: e176058f0de5 ("tty: Abstract tty buffer work") Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: Fix tty_send_xchar() lock order inversionPeter Hurley2015-11-212-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The correct lock order is atomic_write_lock => termios_rwsem, as established by tty_write() => n_tty_write(). Fixes: c274f6ef1c666 ("tty: Hold termios_rwsem for tcflow(TCIxxx)") Reported-and-Tested-by: Dmitry Vyukov <dvyukov@google.com> Cc: <stable@vger.kernel.org> # v3.18+ Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | | Merge tag 'staging-4.4-rc2' of ↵Linus Torvalds2015-11-228-64/+115
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging Pull staging/IIO fixes from Greg KH: "Here are some staging and iio driver fixes for 4.4-rc2. All of these are in response to issues that have been reported and have been in linux-next for a while" * tag 'staging-4.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: Revert "Staging: wilc1000: coreconfigurator: Drop unneeded wrapper functions" iio: adc: xilinx: Fix VREFN scale iio: si7020: Swap data byte order iio: adc: vf610_adc: Fix division by zero error iio:ad7793: Fix ad7785 product ID iio: ad5064: Fix ad5629/ad5669 shift iio:ad5064: Make sure ad5064_i2c_write() returns 0 on success iio: lpc32xx_adc: fix warnings caused by enabling unprepared clock staging: iio: select IRQ_WORK for IIO_DUMMY_EVGEN vf610_adc: Fix internal temperature calculation
| * | | Revert "Staging: wilc1000: coreconfigurator: Drop unneeded wrapper functions"Glen Lee2015-11-181-23/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The source and destination pointers are misplaced. This will be like, ether_addr_copy(data, bssid + ADDR2); -> ether_addr_copy(bssid, data + ADDR2); and also to use ether_addr_copy, it has to be proved that src/dst address are properly aligned(2). I revert this as author agree to drop this patch. This reverts commit d4622f68db8095dd54179e3134e97812727f6b89. Signed-off-by: Glen Lee <glen.lee@atmel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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