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SubjectRe: [patch] Real-Time Preemption, -RT-2.6.13-rc6-V0.7.53-11
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Date
Hi Ingo,

two small buglets for my config. This is the first .53 kernel that
worked for me (admittedly -07 was the last I tried). It feels a bit odd
but that might be the lack of sleep.

two traces, two patches.

Peter Zijlstra

kernel: WARNING: swapper/1 changed soft IRQ-flags.
kernel: [<c01046b3>] dump_stack+0x23/0x30 (20)
kernel: [<c0147e2f>] illegal_API_call+0x4f/0x60 (20)
kernel: [<c0147f31>] __local_irq_save+0x31/0x40 (8)
kernel: [<c02d4a2e>] rh_call_control+0x16e/0x3e0 (88)
kernel: [<c02d4f53>] rh_urb_enqueue+0x33/0x60 (20)
kernel: [<c02d5c04>] hcd_submit_urb+0x194/0x1c0 (44)
kernel: [<c02d6a01>] usb_submit_urb+0x1e1/0x2c0 (44)
kernel: [<c02d6d1e>] usb_start_wait_urb+0x6e/0x120 (164)
kernel: [<c02d6e69>] usb_internal_control_msg+0x99/0xb0 (32)
kernel: [<c02d6f12>] usb_control_msg+0x92/0xb0 (56)
kernel: [<c02d781a>] usb_get_descriptor+0x9a/0xe0 (76)
kernel: [<c02d7cb5>] usb_get_device_descriptor+0x65/0xa0 (44)
kernel: [<c02d5507>] register_root_hub+0x77/0x160 (44)
kernel: [<c02d63c2>] usb_add_hcd+0x172/0x3b0 (56)
kernel: [<c02dafec>] usb_hcd_pci_probe+0x27c/0x3b0 (56)
kernel: [<c022ea26>] __pci_device_probe+0x56/0x70 (28)
kernel: [<c022ea74>] pci_device_probe+0x34/0x60 (24)
kernel: [<c028156e>] driver_probe_device+0x3e/0xc0 (36)
kernel: [<c02816ef>] __driver_attach+0x4f/0x60 (24)
kernel: [<c0280b12>] bus_for_each_dev+0x62/0x90 (48)
kernel: [<c028172d>] driver_attach+0x2d/0x30 (24)
kernel: [<c0281068>] bus_add_driver+0x88/0xf0 (36)
kernel: [<c0281b4d>] driver_register+0x5d/0x70 (32)
kernel: [<c022ed8a>] pci_register_driver+0x9a/0xc0 (28)
kernel: [<c048c7a9>] ohci_hcd_pci_init+0x39/0x40 (16)
kernel: [<c0471b02>] do_initcalls+0x32/0xf0 (36)
kernel: [<c0471bea>] do_basic_setup+0x2a/0x30 (8)
kernel: [<c01003fa>] init+0x8a/0x290 (24)
kernel: [<c01015f9>] kernel_thread_helper+0x5/0xc (1049518108)
kernel: ---------------------------
kernel: | preempt count: 00000000 ]
kernel: | 0-level deep critical section nesting:
kernel: ----------------------------------------
kernel:
kernel: ------------------------------
kernel: | showing all locks held by: | (swapper/1 [c171b4f0, 116]):
kernel: ------------------------------
kernel:
kernel: #001: [c07f6a74] {(struct semaphore *)(&hwif->gendev_rel_sem)}
kernel: ... acquired at: init_hwif_data+0x94/0x190
kernel:
kernel: #002: [c07f75f4] {(struct semaphore *)(&hwif->gendev_rel_sem)}
kernel: ... acquired at: init_hwif_data+0x94/0x190
kernel:
kernel: #003: [c07f8174] {(struct semaphore *)(&hwif->gendev_rel_sem)}
kernel: ... acquired at: init_hwif_data+0x94/0x190
kernel:
kernel: #004: [c07f8cf4] {(struct semaphore *)(&hwif->gendev_rel_sem)}
kernel: ... acquired at: init_hwif_data+0x94/0x190
kernel:
kernel: #005: [c07f9874] {(struct semaphore *)(&hwif->gendev_rel_sem)}
kernel: ... acquired at: init_hwif_data+0x94/0x190
kernel:
kernel: #006: [c07fa3f4] {(struct semaphore *)(&hwif->gendev_rel_sem)}
kernel: ... acquired at: init_hwif_data+0x94/0x190
kernel:
kernel: #007: [c07faf74] {(struct semaphore *)(&hwif->gendev_rel_sem)}
kernel: ... acquired at: init_hwif_data+0x94/0x190
kernel:
kernel: #008: [c07fbaf4] {(struct semaphore *)(&hwif->gendev_rel_sem)}
kernel: ... acquired at: init_hwif_data+0x94/0x190
kernel:
kernel: #009: [c07fc674] {(struct semaphore *)(&hwif->gendev_rel_sem)}
kernel: ... acquired at: init_hwif_data+0x94/0x190
kernel:
kernel: #010: [c07fd1f4] {(struct semaphore *)(&hwif->gendev_rel_sem)}
kernel: ... acquired at: init_hwif_data+0x94/0x190
kernel:
kernel: #011: [efe6fa00] {(struct semaphore *)(&dev->sem)}
kernel: ... acquired at: __driver_attach+0x21/0x60
kernel:
kernel: #012: [c03dcfe4] {kernel_sem.lock}
kernel: ... acquired at: __reacquire_kernel_lock+0x38/0x80
kernel:
kernel: #013: [c0429144] {usb_bus_list_lock.lock}
kernel: ... acquired at: register_root_hub+0x5b/0x160

--- linux-2.6.13-rc6-git7-RT-V0.7.53-11/drivers/usb/core/hcd.c~ 2005-08-15 21:23:45.000000000 +0200
+++ linux-2.6.13-rc6-git7-RT-V0.7.53-11/drivers/usb/core/hcd.c 2005-08-15 22:03:33.000000000 +0200
@@ -506,13 +506,11 @@ error:
}

/* any errors get returned through the urb completion */
- local_irq_save (flags);
+ local_irq_save_nort (flags);
spin_lock (&urb->lock);
if (urb->status == -EINPROGRESS)
urb->status = status;
spin_unlock (&urb->lock);
usb_hcd_giveback_urb (hcd, urb, NULL);
- local_irq_restore (flags);
+ local_irq_restore_nort (flags);
return 0;
}

kernel: WARNING: softirq-timer/0/4 changed soft IRQ-flags.
kernel: [<c01046b3>] dump_stack+0x23/0x30 (20)
kernel: [<c0147e2f>] illegal_API_call+0x4f/0x60 (20)
kernel: [<c0147f31>] __local_irq_save+0x31/0x40 (8)
kernel: [<c02d4cda>] usb_hcd_poll_rh_status+0x5a/0x180 (48)
kernel: [<c02d4e16>] rh_timer_func+0x16/0x20 (12)
kernel: [<c0131b30>] run_timer_softirq+0x210/0x430 (64)
kernel: [<c012d5af>] ksoftirqd+0xff/0x1f0 (48)
kernel: [<c013f816>] kthread+0xb6/0xf0 (48)
kernel: [<c01015f9>] kernel_thread_helper+0x5/0xc (268668956)
kernel: ---------------------------
kernel: | preempt count: 00000000 ]
kernel: | 0-level deep critical section nesting:
kernel: ----------------------------------------
kernel:
kernel: ------------------------------
kernel: | showing all locks held by: | (softirq-timer/0/4 [effc5510, 98]):
kernel: ------------------------------
kernel:

similar fix, completions need not have irqs disabled on
PREEMPT_RT right?

--- linux-2.6.13-rc6-git7-RT-V0.7.53-11/drivers/usb/core/hcd.c~ 2005-08-15 22:03:33.000000000 +0200
+++ linux-2.6.13-rc6-git7-RT-V0.7.53-11/drivers/usb/core/hcd.c 2005-08-15 22:32:54.000000000 +0200
@@ -538,7 +538,7 @@ void usb_hcd_poll_rh_status(struct usb_h
if (length > 0) {

/* try to complete the status urb */
- local_irq_save (flags);
+ local_irq_save_nort (flags);
spin_lock(&hcd_root_hub_lock);
urb = hcd->status_urb;
if (urb) {
@@ -562,7 +562,7 @@ void usb_hcd_poll_rh_status(struct usb_h
usb_hcd_giveback_urb (hcd, urb, NULL);
else
hcd->poll_pending = 1;
- local_irq_restore (flags);
+ local_irq_restore_nort (flags);
}

/* The USB 2.0 spec says 256 ms. This is close enough and won't


--
Peter Zijlstra <a.p.zijlstra@chello.nl>

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