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2017-06-22dt-bindings: arm: amlogic: Add Libre Technology CC boardJerome Brunet1-0/+1
Add bindings documentation for the CC board from Shenzhen Libre Technology Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-06-22dt-bindings: add Libre Technology vendor prefixJerome Brunet1-0/+1
Shenzhen Libre Technology Co., Ltd is a single board computer manufacturer Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-06-16ARM64: dts: meson-gx: Add SPICC nodesNeil Armstrong3-0/+23
Add nodes for the SPICC controller on GX common dtsi, GXBB and GXL dtsi files. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-06-09ARM64: dts: meson-gxl-s905x-p212: Add HDMI and CVBS nodesNeil Armstrong1-0/+23
Add HDMI and CVBS nodes for the Amlogic P212 reference board. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-06-09ARM64: dts: meson-gxl-s905x-khadas-vim: Add HDMI nodesNeil Armstrong1-0/+23
Add HDMI nodes for the Khadas Vim board. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-06-09ARM64: dts: meson-gxl-s905d-p230: Add HDMI nodesNeil Armstrong1-0/+24
Add HDMI nodes for the Amlogic P230 board. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-06-09ARM64: dts: meson-gxbb-wetek-play2: Add HDMI and CVBS NodesNeil Armstrong1-0/+40
Add HDMI and CVBS nodes for the Wetek Play2 board. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-06-06ARM64: dts: meson-gx: Fix sensors reporting from SCPCarlo Caione1-1/+1
Switch to use the new compatible for the SCPI sensors so that the sensor readings are reported using the correct scale. Signed-off-by: Carlo Caione <carlo@endlessm.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-30ARM64: dts: meson-gxl: Add SPI pinctrl nodesNeil Armstrong1-0/+16
This patch adds the SPICC Controller pins nodes for Amlogic GXL SoCs. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-30ARM64: dts: meson-gxbb: Add SPI pinctrl nodesNeil Armstrong1-0/+16
This patch adds the SPICC Controller pins nodes for Amlogic GXBB SoCs. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-30ARM64: dts: meson-gxl: Add Ethernet PHY LEDS pins nodesNeil Armstrong1-0/+14
The Amlogic Meson GXL SoCs embeds an 10/100 Ethernet PHY, this patchs adds the Link and Activity LEDs signals pins nodes. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-30ARM64: dts: meson-gxl: Add CEC pins nodesNeil Armstrong1-0/+14
Add the AO and EE domain CEC pins nodes for the Amlogic Meson GXL SoCs. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-30ARM64: dts: meson-gxbb: Add CEC pins nodesNeil Armstrong1-0/+14
Add the AO and EE domain CEC pins nodes for the Amlogic Meson GXBB SoCs. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-30ARM64: dts: Fix GXBB periphs pinctrl pull-enable register baseNeil Armstrong1-1/+1
The pull-enable register base was wrongly copied from the meson8b pinctrl node, but was not used yet. Fixes: c328666d58aa ("ARM64: dts: amlogic: Add Meson GX dtsi from GXBB") Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-30ARM64: dts: Fix GXL periphs pinctrl pull-enable register baseNeil Armstrong1-1/+1
The pull-enable register base was wrongly copied from the GXBB pinctrl node, but was not used yet. Fixes: fb0fe92294a9 ("ARM64: dts: meson-gxl: Add pinctrl nodes") Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-30ARM64: dts: meson-gxl: Fix pinctrl periphs gpio-rangesNeil Armstrong1-1/+1
The gpio-range was badly added on the GXL dtsi, the AO pin count is 10 instead of 14. Fixes: 84412e4e857f ("ARM64: dts: meson-gxl: Add gpio-ranges properties") Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-30arm64: dts: amlogic: Add NanoPi K2Andreas Färber2-0/+292
The FriendlyARM NanoPi K2 is a single-board computer. Cc: techsupport@friendlyarm.com Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-30dt-bindings: arm: amlogic: Add NanoPi K2Andreas Färber1-0/+1
The FriendlyARM NanoPi K2 is a single-board computer. Cc: techsupport@friendlyarm.com Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-30arm64: dts: meson-gxm: Add R-Box ProAndreas Färber2-0/+241
The R-Box Pro is a TV box derived from Amlogic q200 reference design. It uses an AP6255 Wifi module. It features an LED tube that lights a surrounding stripe and the top logo in blue or red or pink'ish - blue is on by default, and red (i.e., pink) is configured as panic indicator. This device is available in at least two models, with 2 GB vs. 3 GB RAM as well as varying eMMC size. The intent is to handle this with a single .dts that gets the actual RAM size from U-Boot. Cc: ada@kingnoval.com Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-30dt-bindings: arm: amlogic: Add R-Box ProAndreas Färber1-0/+1
Cc: ada@kingnoval.com Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-30dt-bindings: Add Kingnovel vendor prefixAndreas Färber1-0/+1
Their domain name is spelled kingnoval, but textually Kingnovel. Cc: ada@kingnoval.com Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-29clk: meson-gxbb: un-export the CPU clockMartin Blumenstingl2-2/+1
The CPU clock defined in the Meson GX clock driver is actually a left-over from the Meson8b clock controller. Un-export the clock so we can remove it from the driver. Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
2017-05-29clk: meson-gxbb: expose UART clocksHelmut Klein2-3/+6
Expose the clock ids of the three none AO uarts to the dt-bindings Acked-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Helmut Klein <hgkr.klein@gmail.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> [tidy the commit message to match similar change] Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
2017-05-29clk: meson-gxbb: expose SPICC gateNeil Armstrong2-1/+2
Expose the SPICC gate clock to enable the SPICC controller. Acked-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> [tidy commit message to match similar changes] Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
2017-05-29clk: meson-gxbb: expose spdif master clockJerome Brunet2-2/+4
Expose the spdif master clock and the mux to select the appropriate spdif clock parent depending on the data source. Acked-by: Michael Turquette <mturquette@baylibre.com> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
2017-05-29clk: meson-gxbb: expose i2s master clockJerome Brunet2-1/+2
Expose cts_amclk in the device tree bindings Acked-by: Michael Turquette <mturquette@baylibre.com> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
2017-05-29clk: meson-gxbb: expose spdif clock gatesJerome Brunet2-2/+4
Expose the clock gates required for the spdif output Acked-by: Michael Turquette <mturquette@baylibre.com> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
2017-05-17arm64: dts: meson-gx-p23x-q20x: Fix node orderAndreas Färber1-29/+29
Sort nodes referenced by label alphabetically. Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxm-nexbox-a1: Fix node orderAndreas Färber1-43/+43
Sort nodes referenced by label alphabetically. Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxl-s905x-nexbox-a95x: Fix node orderAndreas Färber1-26/+26
Sort nodes referenced by label alphabetically. Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxl: Fix node orderAndreas Färber1-36/+36
Sort nodes referenced by label alphabetically. Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxbb-p20x: Fix node orderAndreas Färber1-31/+31
Sort nodes referenced by label alphabetically. Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxbb-nexbox-a95x: Fix node orderAndreas Färber1-26/+26
Sort nodes referenced by label alphabetically. Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxbb-vega-s95: Fix node orderAndreas Färber1-27/+27
Sort nodes referenced by label alphabetically. Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxbb-odroidc2: Fix node orderAndreas Färber1-54/+54
Sort nodes referenced by label alphabetically. Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxbb: Fix node orderAndreas Färber1-85/+96
Sort nodes referenced by label alphabetically. Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxbb-wetek-hub: Reference CVBS node by labelAndreas Färber2-4/+4
Makes the override safer. Acked-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Andreas Färber <afaerber@suse.de> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxl-s905x: Comment typo fixAndreas Färber1-1/+1
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Andreas Färber <afaerber@suse.de> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxm-nexbox-a1: Drop UART commentAndreas Färber1-1/+0
Product pictures show no DB9 connector, so this seems copy&paste. Acked-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Andreas Färber <afaerber@suse.de> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxl-s905x-khadas-vim: Fix Wifi node nameAndreas Färber1-1/+1
bcrmf -> brcmf -> wifi Fixes: e15d2774b8c0 ("ARM64: dts: meson-gxl: add support for the Khadas VIM board") Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Signed-off-by: Andreas Färber <afaerber@suse.de> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gx-p23x-q20x: Fix Wifi node nameAndreas Färber1-1/+1
bcrmf -> brcmf -> wifi Fixes: bb51b5350d2f ("ARM64: dts: Add support for Meson GXM") Cc: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Andreas Färber <afaerber@suse.de> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxbb-p20x: Fix Wifi node nameAndreas Färber1-1/+1
bcrmf -> brcmf -> wifi Fixes: ab3943fe57a2 ("ARM64: dts: meson-gxbb: Add P20x Wifi SDIO support") Cc: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Andreas Färber <afaerber@suse.de> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: meson-gxbb-vega-s95: Fix Wifi node nameAndreas Färber1-1/+1
bcrmf -> brcmf -> wifi Fixes: ab5b24fdd2d5 ("ARM64: dts: meson-gxbb-vega-s95: Add SD/SDIO/MMC and PWM nodes") Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Signed-off-by: Andreas Färber <afaerber@suse.de> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17arm64: dts: amlogic: Sort MakefileAndreas Färber1-3/+3
Sort the .dtb files alphabetically to make clear where to add new ones. Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-17dt-bindings: arm: amlogic: Reorder boardsAndreas Färber1-7/+13
Enforce groupment by SoCs, and order alphabetically within the group (with some exceptions). This should facilitate adding new boards. Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
2017-05-13Linux 4.12-rc1Linus Torvalds1-2/+2
2017-05-12mm, docs: update memory.stat description with workingset* entriesRoman Gushchin1-0/+12
Commit 4b4cea91691d ("mm: vmscan: fix IO/refault regression in cache workingset transition") introduced three new entries in memory stat file: - workingset_refault - workingset_activate - workingset_nodereclaim This commit adds a corresponding description to the cgroup v2 docs. Link: http://lkml.kernel.org/r/1494530293-31236-1-git-send-email-guro@fb.com Signed-off-by: Roman Gushchin <guro@fb.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Tejun Heo <tj@kernel.org> Cc: Li Zefan <lizefan@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-05-12mm: vmscan: scan until it finds eligible pagesMinchan Kim1-6/+15
Although there are a ton of free swap and anonymous LRU page in elgible zones, OOM happened. balloon invoked oom-killer: gfp_mask=0x17080c0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_NOTRACK), nodemask=(null), order=0, oom_score_adj=0 CPU: 7 PID: 1138 Comm: balloon Not tainted 4.11.0-rc6-mm1-zram-00289-ge228d67e9677-dirty #17 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014 Call Trace: oom_kill_process+0x21d/0x3f0 out_of_memory+0xd8/0x390 __alloc_pages_slowpath+0xbc1/0xc50 __alloc_pages_nodemask+0x1a5/0x1c0 pte_alloc_one+0x20/0x50 __pte_alloc+0x1e/0x110 __handle_mm_fault+0x919/0x960 handle_mm_fault+0x77/0x120 __do_page_fault+0x27a/0x550 trace_do_page_fault+0x43/0x150 do_async_page_fault+0x2c/0x90 async_page_fault+0x28/0x30 Mem-Info: active_anon:424716 inactive_anon:65314 isolated_anon:0 active_file:52 inactive_file:46 isolated_file:0 unevictable:0 dirty:27 writeback:0 unstable:0 slab_reclaimable:3967 slab_unreclaimable:4125 mapped:133 shmem:43 pagetables:1674 bounce:0 free:4637 free_pcp:225 free_cma:0 Node 0 active_anon:1698864kB inactive_anon:261256kB active_file:208kB inactive_file:184kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:532kB dirty:108kB writeback:0kB shmem:172kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no DMA free:7316kB min:32kB low:44kB high:56kB active_anon:8064kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB slab_reclaimable:464kB slab_unreclaimable:40kB kernel_stack:0kB pagetables:24kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 992 992 1952 DMA32 free:9088kB min:2048kB low:3064kB high:4080kB active_anon:952176kB inactive_anon:0kB active_file:36kB inactive_file:0kB unevictable:0kB writepending:88kB present:1032192kB managed:1019388kB mlocked:0kB slab_reclaimable:13532kB slab_unreclaimable:16460kB kernel_stack:3552kB pagetables:6672kB bounce:0kB free_pcp:56kB local_pcp:24kB free_cma:0kB lowmem_reserve[]: 0 0 0 959 Movable free:3644kB min:1980kB low:2960kB high:3940kB active_anon:738560kB inactive_anon:261340kB active_file:188kB inactive_file:640kB unevictable:0kB writepending:20kB present:1048444kB managed:1010816kB mlocked:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:832kB local_pcp:60kB free_cma:0kB lowmem_reserve[]: 0 0 0 0 DMA: 1*4kB (E) 0*8kB 18*16kB (E) 10*32kB (E) 10*64kB (E) 9*128kB (ME) 8*256kB (E) 2*512kB (E) 2*1024kB (E) 0*2048kB 0*4096kB = 7524kB DMA32: 417*4kB (UMEH) 181*8kB (UMEH) 68*16kB (UMEH) 48*32kB (UMEH) 14*64kB (MH) 3*128kB (M) 1*256kB (H) 1*512kB (M) 2*1024kB (M) 0*2048kB 0*4096kB = 9836kB Movable: 1*4kB (M) 1*8kB (M) 1*16kB (M) 1*32kB (M) 0*64kB 1*128kB (M) 2*256kB (M) 4*512kB (M) 1*1024kB (M) 0*2048kB 0*4096kB = 3772kB 378 total pagecache pages 17 pages in swap cache Swap cache stats: add 17325, delete 17302, find 0/27 Free swap = 978940kB Total swap = 1048572kB 524157 pages RAM 0 pages HighMem/MovableOnly 12629 pages reserved 0 pages cma reserved 0 pages hwpoisoned [ pid ] uid tgid total_vm rss nr_ptes nr_pmds swapents oom_score_adj name [ 433] 0 433 4904 5 14 3 82 0 upstart-udev-br [ 438] 0 438 12371 5 27 3 191 -1000 systemd-udevd With investigation, skipping page of isolate_lru_pages makes reclaim void because it returns zero nr_taken easily so LRU shrinking is effectively nothing and just increases priority aggressively. Finally, OOM happens. The problem is that get_scan_count determines nr_to_scan with eligible zones so although priority drops to zero, it couldn't reclaim any pages if the LRU contains mostly ineligible pages. get_scan_count: size = lruvec_lru_size(lruvec, lru, sc->reclaim_idx); size = size >> sc->priority; Assumes sc->priority is 0 and LRU list is as follows. N-N-N-N-H-H-H-H-H-H-H-H-H-H-H-H-H-H-H-H (Ie, small eligible pages are in the head of LRU but others are almost ineligible pages) In that case, size becomes 4 so VM want to scan 4 pages but 4 pages from tail of the LRU are not eligible pages. If get_scan_count counts skipped pages, it doesn't reclaim any pages remained after scanning 4 pages so it ends up OOM happening. This patch makes isolate_lru_pages try to scan pages until it encounters eligible zones's pages. [akpm@linux-foundation.org: clean up mind-bending `for' statement. Tweak comment text] Fixes: 3db65812d688 ("Revert "mm, vmscan: account for skipped pages as a partial scan"") Link: http://lkml.kernel.org/r/1494457232-27401-1-git-send-email-minchan@kernel.org Signed-off-by: Minchan Kim <minchan@kernel.org> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-05-12mm, thp: copying user pages must schedule on collapseDavid Rientjes1-4/+3
We have encountered need_resched warnings in __collapse_huge_page_copy() while doing {clear,copy}_user_highpage() over HPAGE_PMD_NR source pages. mm->mmap_sem is held for write, but the iteration is well bounded. Reschedule as needed. Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1705101426380.109808@chino.kir.corp.google.com Signed-off-by: David Rientjes <rientjes@google.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-05-12dax: fix PMD data corruption when fault races with writeRoss Zwisler1-14/+14
This is based on a patch from Jan Kara that fixed the equivalent race in the DAX PTE fault path. Currently DAX PMD read fault can race with write(2) in the following way: CPU1 - write(2) CPU2 - read fault dax_iomap_pmd_fault() ->iomap_begin() - sees hole dax_iomap_rw() iomap_apply() ->iomap_begin - allocates blocks dax_iomap_actor() invalidate_inode_pages2_range() - there's nothing to invalidate grab_mapping_entry() - we add huge zero page to the radix tree and map it to page tables The result is that hole page is mapped into page tables (and thus zeros are seen in mmap) while file has data written in that place. Fix the problem by locking exception entry before mapping blocks for the fault. That way we are sure invalidate_inode_pages2_range() call for racing write will either block on entry lock waiting for the fault to finish (and unmap stale page tables after that) or read fault will see already allocated blocks by write(2). Fixes: 9f141d6ef6258 ("dax: Call ->iomap_begin without entry lock during dax fault") Link: http://lkml.kernel.org/r/20170510172700.18991-1-ross.zwisler@linux.intel.com Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Dan Williams <dan.j.williams@intel.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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