[Deepin-Kernel-SIG] [linux 6.6-y] [Upstream] Update kernel base to 6.6.79Linux stable update 6.6.79 v3

[opsiff]

Summary by Sourcery

Sync the kernel base to Linux stable release 6.6.79.

[sourcery-ai]

Reviewer's Guide by Sourcery

The pull request updates the Linux kernel to version 6.6.79, incorporating various changes across multiple subsystems, including drivers, architecture-specific code, and core kernel functionalities. Key changes include updates to the HID subsystem, RAID5 improvements, network stack enhancements, and various bug fixes and optimizations.

Updated class diagram for steam_device

classDiagram
  class steam_device {
    struct list_head list
    spinlock_t lock
    struct hid_device *hdev, *client_hdev
    struct mutex report_mutex
    bool client_opened
    struct input_dev __rcu *input
    struct input_dev __rcu *sensors
    unsigned long quirks
    struct work_struct work_connect
    bool connected
    char serial_no[STEAM_SERIAL_LEN + 1]
    struct power_supply __rcu *battery
    u8 battery_charge
    u16 voltage
    struct delayed_work mode_switch
    bool did_mode_switch
    bool gamepad_mode
    struct work_struct rumble_work
    u16 rumble_left
    u16 rumble_right
    unsigned int sensor_timestamp_us
    struct work_struct unregister_work
  }
  note for steam_device "Added sensors, mode_switch, did_mode_switch, gamepad_mode, sensor_timestamp_us, and unregister_work fields."

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File-Level Changes

Change	Details	Files
Update HID Steam driver with new resolutions and command IDs.	Added new resolution definitions for accelerometer and gyroscope. Replaced command and register definitions with enums for better readability. Introduced new settings and input report identifiers.	drivers/hid/hid-steam.c
Refactor RAID5 bitmap handling and introduce reshape location tracking.	Removed STRIPE_BITMAP_PENDING and STRIPE_DEGRADED flags. Introduced reshape location tracking with new enum and helper functions. Refactored bitmap start and end write functions.	drivers/md/raid5.c drivers/md/md-bitmap.c drivers/md/md-bitmap.h
Enhance network stack with improved PMTU exception handling and multipath routing.	Added new test for IPv4 multipath PMTU exceptions. Refactored route_get_dst_exception to handle multiple parameters. Improved handling of PMTU exceptions in multipath scenarios.	tools/testing/selftests/net/pmtu.sh net/ipv4/route.c
Fix and optimize various drivers and subsystems.	Fixed potential null pointer dereference in UVC driver. Optimized GPIO lock/unlock operations in Kona driver. Resolved memory leaks in regmap IRQ handling.	drivers/media/usb/uvc/uvc_video.c drivers/gpio/gpio-bcm-kona.c drivers/base/regmap/regmap-irq.c
Update architecture-specific code for ARM64 and x86.	Added support for new hardware capabilities in ARM64. Improved TLB flushing logic in x86 to handle lazy TLBs more efficiently. Fixed potential race conditions in x86 static call updates.	arch/arm64/kernel/cpufeature.c arch/x86/mm/tlb.c arch/x86/kernel/static_call.c

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[github-actions]

WARNING: Prefer a maximum 75 chars per line (possible unwrapped commit description?)

[github-actions]

WARNING: Prefer a maximum 75 chars per line (possible unwrapped commit description?)

[github-actions]

ERROR: Avoid using diff content in the commit message - patch(1) might not work

[github-actions]

ERROR: patch seems to be corrupt (line wrapped?)

[github-actions]

WARNING: Prefer a maximum 75 chars per line (possible unwrapped commit description?)

[github-actions]

WARNING: Prefer a maximum 75 chars per line (possible unwrapped commit description?)

[sourcery-ai]

Hey @opsiff - I've reviewed your changes - here's some feedback:

Overall Comments:

• The commit message could be improved to better describe the changes, especially the addition of new enums and constants.
• Consider adding comments to explain the purpose of the new enums and constants in drivers/hid/hid-steam.c.
• The changes in drivers/md/raid5.c remove some calls to md_bitmap_endwrite, consider if this could lead to inconsistencies.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟡 Complexity: 1 issue found
• 🟢 Documentation: all looks good

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[sourcery-ai]

issue (complexity): Consider refactoring the allocation logic to use a static allocation for the common case and only dynamically allocate when a larger order is needed.

The dynamic reallocation logic adds extra state and complicated locking that might be avoided. If most cases use the fixed minimum order, consider simplifying by always using the static allocation unless a larger order is absolutely needed. For example, refactor the allocation logic to:

• Only dynamically allocate when order > MIN_CONTIG_ORDER.
• Keep the fixed array for the common case.
• Encapsulate the dynamic-swap logic in a well‐documented helper to limit its spread.

A possible refactoring could be:

/* Only allocate dynamically if needed */
static int ensure_discontig_frames(unsigned int order)
{
    if (order <= MIN_CONTIG_ORDER)
        return 0;

    /* Dynamic allocation needed for orders > MIN_CONTIG_ORDER */
    unsigned long *new_array = (unsigned long *)__get_free_pages(GFP_KERNEL, order - MIN_CONTIG_ORDER);
    if (!new_array)
        return -ENOMEM;

    unsigned long flags;
    spin_lock_irqsave(&xen_reservation_lock, flags);
    {
        unsigned long *old_array = discontig_frames_dyn ? discontig_frames : NULL;

        /* Update globals only if the new order is larger */
        if (order > discontig_frames_order) {
            discontig_frames = new_array;
            discontig_frames_order = order;
            discontig_frames_dyn = true;
        } else {
            old_array = new_array;
        }
        spin_unlock_irqrestore(&xen_reservation_lock, flags);

        if (old_array)
            free_pages((unsigned long)old_array, old_order - MIN_CONTIG_ORDER);
    }
    return 0;
}

Then update xen_create_contiguous_region() and xen_destroy_contiguous_region() to call this helper before using discontig_frames. This approach isolates the higher complexity code and only applies dynamic allocation when required, making the common path simpler without changing functionality.

These steps maintain all functionality while reducing cognitive overhead around dynamic allocation and the associated spinlock manipulations.