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[PATCH 0/4] mm/damon/sysfs: free setup failures generated zombie sub-sub dirs

by SeongJae Park

Some DAMON sysfs directory setup functions generates its sub and sub-sub directories. For example, 'monitoring_attrs/' directory setup creates 'intervals/' and 'intervals/intervals_goal/' directories under 'monitoring_attrs/' directory. When such sub-sub directories are successfully made but followup setup is failed, the setup function should recursively clean up the subdirectories. However, such setup functions are only dereferencing sub directory reference counters. As a result, under certain setup failures, the sub-sub directories keep having non-zero reference counters. It means the directories cannot be removed like zombies, and the memory for the directories cannot be freed. The user impact of this issue is limited due to the following reasons. When the issue happens, the zombie directories are still taking the path. Hence attempts to generate the directories again will fail, without additional memory leak. This means the upper bound memory leak is limited. Nonetheless this also implies controlling DAMON with a feature that requires the setup-failed sysfs files will be impossible until the system reboots. Also, the setup operations are quite simple. The certain failures would hence only rarely happen, and are difficult to artificially trigger. SeongJae Park (4): mm/damon/sysfs: cleanup intervals subdirs on attrs dir setup failure mm/damon/sysfs: cleanup attrs subdirs on context dir setup failure mm/damon/sysfs-scheme: cleanup quotas subdirs on scheme dir setup failure mm/damon/sysfs-scheme: cleanup access_pattern subdirs on scheme dir setup failure mm/damon/sysfs-schemes.c | 10 ++++++---- mm/damon/sysfs.c | 9 ++++++--- 2 files changed, 12 insertions(+), 7 deletions(-) base-commit: 6d039da6a260dd7919bebc70ebb65d250bb9c24e -- 2.47.3

15 hours, 5 minutes

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Fwd: Request to add mainline merged patch to stable kernels

by JP Dehollain

Hi Greg, thanks for looking into this.. The full commit hash is 807221d3c5ff6e3c91ff57bc82a0b7a541462e20 Note: apologies if you received this multiple times, the previous one got bounced due to html Cheers, JP ________________________________ From: Greg KH <gregkh(a)linuxfoundation.org> Sent: Tuesday, December 23, 2025 6:39:22 PM To: JP Dehollain <jpdehollain(a)gmail.com> Cc: stable(a)vger.kernel.org <stable(a)vger.kernel.org> Subject: Re: Request to add mainline merged patch to stable kernels On Tue, Dec 23, 2025 at 04:05:24PM +1100, JP Dehollain wrote: > Hello, > I recently used the patch misc: rtsx_pci: Add separate CD/WP pin > polarity reversal support with commit ID 807221d, to fix a bug causing > the cardreader driver to always load sd cards in read-only mode. > On the suggestion of the driver maintainer, I am requesting that this > patch be applied to all stable kernel versions, as it is currently > only applied to >=6.18. > Thanks, > JP > What is the git id of the commit you are looking to have backported? thanks, greg k-h

19 hours, 40 minutes

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[PATCH] ARM: dts: integrator: Fix DMA ranges mismatch warning on IM-PD1

by Kuan-Wei Chiu

When compiling the device tree for the Integrator/AP with IM-PD1, the following warning is observed regarding the display controller node: arch/arm/boot/dts/arm/integratorap-im-pd1.dts:251.3-14: Warning (dma_ranges_format): /bus@c0000000/bus@c0000000/display@1000000:dma-ranges: empty "dma-ranges" property but its #address-cells (2) differs from /bus@c0000000/bus@c0000000 (1) The display node specifies an empty "dma-ranges" property, intended to describe a 1:1 identity mapping. However, the node lacks explicit "#address-cells" and "#size-cells" properties. In this case, the device tree compiler defaults the address cells to 2 (64-bit), which conflicts with the parent bus configuration (32-bit, 1 cell). Fix this by explicitly defining "#address-cells" and "#size-cells" as 1. This matches the 32-bit architecture of the Integrator platform and ensures the address translation range is correctly parsed by the compiler. Fixes: 7bea67a99430 ("ARM: dts: integrator: Fix DMA ranges") Cc: stable(a)vger.kernel.org Signed-off-by: Kuan-Wei Chiu <visitorckw(a)gmail.com> --- arch/arm/boot/dts/arm/integratorap-im-pd1.dts | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/boot/dts/arm/integratorap-im-pd1.dts b/arch/arm/boot/dts/arm/integratorap-im-pd1.dts index db13e09f2fab..6d90d9a42dc9 100644 --- a/arch/arm/boot/dts/arm/integratorap-im-pd1.dts +++ b/arch/arm/boot/dts/arm/integratorap-im-pd1.dts @@ -248,6 +248,8 @@ display@1000000 { /* 640x480 16bpp @ 25.175MHz is 36827428 bytes/s */ max-memory-bandwidth = <40000000>; memory-region = <&impd1_ram>; + #address-cells = <1>; + #size-cells = <1>; dma-ranges; port@0 { -- 2.52.0.177.g9f829587af-goog

20 hours, 39 minutes

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[PATCH v1 0/3] mm: mm_cid static initialization fixes

by Mathieu Desnoyers

Hi Andrew, Here are 2 fixes for missing mm_cid fields for init_mm and efi_mm static initialization. The renaming of cpu_bitmap to flexible_array (patch 2) is needed for patch 3. Those are relevant for mainline, with CC stable. They are based on v6.19-rc2. Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Thomas Gleixner <tglx(a)linutronix.de> Cc: stable(a)vger.kernel.org Cc: linux-mm(a)kvack.org Mathieu Desnoyers (3): mm: Add missing static initializer for init_mm::mm_cid.lock mm: Rename cpu_bitmap field to flexible_array mm: Take into account mm_cid size for mm_struct static definitions drivers/firmware/efi/efi.c | 2 +- include/linux/mm_types.h | 18 +++++++++++++----- mm/init-mm.c | 5 ++++- 3 files changed, 18 insertions(+), 7 deletions(-) -- 2.39.5

1 day

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[report] Performance regressions introduced via "cpuidle: menu: Remove iowait influence" on 6.12.y

by ALOK TIWARI

Hi, I’m reporting a performance regression of up to 6% sequential I/O vdbench regression observed on 6.12.y kernel. While running performance benchmarks on v6.12.60 kernel the sequential I/O vdbench metrics are showing a 5-6% performance regression when compared to v6.12.48 Bisect root cause commit ======================== - commit b39b62075ab4 ("cpuidle: menu: Remove iowait influence") Things work fine again when the previously removed performance-multiplier code is added back. Test details ============ The system is connected to a number of disks in disk array using multipathing and directio configuration in the vdbench profile. wd=wd1,sd=sd*,rdpct=0,seekpct=sequential,xfersize=128k rd=128k64T,wd=wd1,iorate=max,elapsed=600,interval=1,warmup=300,threads=64 Thanks, Alok

1 day, 4 hours

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[PATCH v3] virtio: console: fix lost wakeup when device is written and polled

by Lorenz Bauer

A process issuing blocking writes to a virtio console may get stuck indefinitely if another thread polls the device. Here is how to trigger the bug: - Thread A writes to the port until the virtqueue is full. - Thread A calls wait_port_writable() and goes to sleep, waiting on port->waitqueue. - The host processes some of the write, marks buffers as used and raises an interrupt. - Before the interrupt is serviced, thread B executes port_fops_poll(). This calls reclaim_consumed_buffers() via will_write_block() and consumes all used buffers. - The interrupt is serviced. vring_interrupt() finds no used buffers via more_used() and returns without waking port->waitqueue. - Thread A is still in wait_event(port->waitqueue), waiting for a wakeup that never arrives. The crux is that invoking reclaim_consumed_buffers() may cause vring_interrupt() to omit wakeups. Fix this by calling reclaim_consumed_buffers() in out_int() before waking. This is similar to the call to discard_port_data() in in_intr() which also frees buffer from a non-sleepable context. This in turn guarantees that port->outvq_full is up to date when handling polling. Since in_intr() already populates port->inbuf we use that to avoid changing reader state. Cc: stable(a)vger.kernel.org Signed-off-by: Lorenz Bauer <lmb(a)isovalent.com> --- As far as I can tell all currently maintained stable series kernels need this commit. Applies and builds cleanly on 5.10.247, verified to fix the issue. --- Changes in v3: - Use spin_lock_irq in port_fops_poll (Arnd) - Use spin_lock in out_intr (Arnd) - Link to v2: https://lore.kernel.org/r/20251222-virtio-console-lost-wakeup-v2-1-5de93cb3… Changes in v2: - Call reclaim_consumed_buffers() in out_intr instead of issuing another wake. - Link to v1: https://lore.kernel.org/r/20251215-virtio-console-lost-wakeup-v1-1-79a5c578… --- drivers/char/virtio_console.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 088182e54debd6029ea2c2a5542d7a28500e67b8..e6048e04c3b23d008caa2a1d31d4ac6b2841045f 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -971,10 +971,17 @@ static __poll_t port_fops_poll(struct file *filp, poll_table *wait) return EPOLLHUP; } ret = 0; - if (!will_read_block(port)) + + spin_lock_irq(&port->inbuf_lock); + if (port->inbuf) ret |= EPOLLIN | EPOLLRDNORM; - if (!will_write_block(port)) + spin_unlock_irq(&port->inbuf_lock); + + spin_lock_irq(&port->outvq_lock); + if (!port->outvq_full) ret |= EPOLLOUT; + spin_unlock_irq(&port->outvq_lock); + if (!port->host_connected) ret |= EPOLLHUP; @@ -1705,6 +1712,10 @@ static void out_intr(struct virtqueue *vq) return; } + spin_lock(&port->outvq_lock); + reclaim_consumed_buffers(port); + spin_unlock(&port->outvq_lock); + wake_up_interruptible(&port->waitqueue); } --- base-commit: d358e5254674b70f34c847715ca509e46eb81e6f change-id: 20251215-virtio-console-lost-wakeup-0f566c5cd35f Best regards, -- Lorenz Bauer <lmb(a)isovalent.com>

1 day, 6 hours

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[PATCH RESEND v5 0/3] phy: qcom: edp: Add missing ref clock to x1e80100

by Abel Vesa

According to documentation, the DP PHY on x1e80100 has another clock called ref. The current X Elite devices supported upstream work fine without this clock, because the boot firmware leaves this clock enabled. But we should not rely on that. Also, when it comes to power management, this clock needs to be also disabled on suspend. So even though this change breaks the ABI, it is needed in order to make we disable this clock on runtime PM, when that is going to be enabled in the driver. So rework the driver to allow different number of clocks, fix the dt-bindings schema and add the clock to the DT node as well. Signed-off-by: Abel Vesa <abel.vesa(a)linaro.org> --- Changes in v5: - Picked-up Bjorn's R-b tags. - Replaced "parse" with "get" on clocks acquiring failure. - Link to v4: https://lore.kernel.org/r/20251029-phy-qcom-edp-add-missing-refclk-v4-0-adb… Changes in v4: - Picked Dmitry's R-b tag for the driver patch - Added x1e80100 substring to subject of dts patch - Link to v3 (resend): https://lore.kernel.org/r/20251014-phy-qcom-edp-add-missing-refclk-v3-0-078… Changes in v3 (resend) - picked-up Krzysztof's R-b tag for bindings patch - Link to v3: https://lore.kernel.org/r/20250909-phy-qcom-edp-add-missing-refclk-v3-0-4ec… Changes in v3: - Use dev_err_probe() on clocks parsing failure. - Explain why the ABI break is necessary. - Drop the extra 'clk' suffix from the clock name. So ref instead of refclk. - Link to v2: https://lore.kernel.org/r/20250903-phy-qcom-edp-add-missing-refclk-v2-0-d88… Changes in v2: - Fix schema by adding the minItems, as suggested by Krzysztof. - Use devm_clk_bulk_get_all, as suggested by Konrad. - Rephrase the commit messages to reflect the flexible number of clocks. - Link to v1: https://lore.kernel.org/r/20250730-phy-qcom-edp-add-missing-refclk-v1-0-6f7… --- Abel Vesa (3): dt-bindings: phy: qcom-edp: Add missing clock for X Elite phy: qcom: edp: Make the number of clocks flexible arm64: dts: qcom: x1e80100: Add missing TCSR ref clock to the DP PHYs .../devicetree/bindings/phy/qcom,edp-phy.yaml | 28 +++++++++++++++++++++- arch/arm64/boot/dts/qcom/hamoa.dtsi | 12 ++++++---- drivers/phy/qualcomm/phy-qcom-edp.c | 16 ++++++------- 3 files changed, 43 insertions(+), 13 deletions(-) --- base-commit: 131f3d9446a6075192cdd91f197989d98302faa6 change-id: 20250730-phy-qcom-edp-add-missing-refclk-5ab82828f8e7 Best regards, -- Abel Vesa <abel.vesa(a)oss.qualcomm.com>

1 day, 6 hours

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[PATCH v6.1 0/2] x86/mm/pat: fix VM_PAT handling

by Ajay Kaher

[PATCH v6.1 1/2]: required to backport [PATCH v6.1 2/2]. [PATCH v6.1 2/2]: backport to fix VM_PAT handling when fork() fails in copy_page_range(). arch/x86/mm/pat/memtype.c | 50 +++++++++++++++++++++++---------------- include/linux/pgtable.h | 31 ++++++++++++++++++------ kernel/fork.c | 4 ++++ mm/memory.c | 10 ++++---- mm/mremap.c | 2 +- 5 files changed, 62 insertions(+), 35 deletions(-) -- 2.40.4

1 day, 7 hours

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[PATCH] usb: cdns3: fix a null pointer dereference in cdns3_gadget_ep_queue()

by Haoxiang Li

If cdns3_gadget_ep_alloc_request() fails, a null pointer dereference occurs. Add a check to prevent it. Found by code review and compiled on ubuntu 20.04. Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver") Cc: stable(a)vger.kernel.org Signed-off-by: Haoxiang Li <lihaoxiang(a)isrc.iscas.ac.cn> --- drivers/usb/cdns3/cdns3-gadget.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c index 168707213ed9..cc2421a34588 100644 --- a/drivers/usb/cdns3/cdns3-gadget.c +++ b/drivers/usb/cdns3/cdns3-gadget.c @@ -2659,6 +2659,8 @@ static int cdns3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request, struct cdns3_request *priv_req; zlp_request = cdns3_gadget_ep_alloc_request(ep, GFP_ATOMIC); + if (!zlp_request) + return -ENOMEM; zlp_request->buf = priv_dev->zlp_buf; zlp_request->length = 0; -- 2.25.1

1 day, 7 hours

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[PATCH] usb: cdns2: fix a null pointer dereference in cdns2_gadget_ep_queue()

by Haoxiang Li

If cdns2_gadget_ep_alloc_request() fails, a null pointer dereference occurs. Add a check to prevent it. Fixes: 3eb1f1efe204 ("usb: cdns2: Add main part of Cadence USBHS driver") Cc: stable(a)vger.kernel.org Signed-off-by: Haoxiang Li <lihaoxiang(a)isrc.iscas.ac.cn> --- drivers/usb/gadget/udc/cdns2/cdns2-gadget.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/usb/gadget/udc/cdns2/cdns2-gadget.c b/drivers/usb/gadget/udc/cdns2/cdns2-gadget.c index 9b53daf76583..c5b9dae743d8 100644 --- a/drivers/usb/gadget/udc/cdns2/cdns2-gadget.c +++ b/drivers/usb/gadget/udc/cdns2/cdns2-gadget.c @@ -1725,6 +1725,8 @@ static int cdns2_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request, struct cdns2_request *preq; zlp_request = cdns2_gadget_ep_alloc_request(ep, GFP_ATOMIC); + if (!zlp_request) + return -ENOMEM; zlp_request->buf = pdev->zlp_buf; zlp_request->length = 0; -- 2.25.1

1 day, 7 hours

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