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Remove spinlock and use the "rtc->ops_lock" from RTC subsystem instead. spin_lock_irqsave() is not needed here because we do not have hard IRQs. This patch fixes the following issue: root@GE004097290448 b850v3:~# hwclock --systohc root@GE004097290448 b850v3:~# hwclock --systohc root@GE004097290448 b850v3:~# hwclock --systohc root@GE004097290448 b850v3:~# hwclock --systohc root@GE004097290448 b850v3:~# hwclock --systohc [ 82.108175] BUG: spinlock wrong CPU on CPU#0, hwclock/855 [ 82.113660] lock: 0xedb4899c, .magic: dead4ead, .owner: hwclock/855, .owner_cpu: 1 [ 82.121329] CPU: 0 PID: 855 Comm: hwclock Not tainted 4.8.0-00042-g09d5410-dirty #20 [ 82.129078] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) [ 82.135609] Backtrace: [ 82.138090] [<8010d378>] (dump_backtrace) from [<8010d5c0>] (show_stack+0x20/0x24) [ 82.145664] r7:ec936000 r6:600a0013 r5:00000000 r4:81031680 [ 82.151402] [<8010d5a0>] (show_stack) from [<80401518>] (dump_stack+0xb4/0xe8) [ 82.158636] [<80401464>] (dump_stack) from [<8017b8b0>] (spin_dump+0x84/0xcc) [ 82.165775] r10:00000000 r9:ec936000 r8:81056090 r7:600a0013 r6:edb4899c r5:edb4899c [ 82.173691] r4:e5033e00 r3:00000000 [ 82.177308] [<8017b82c>] (spin_dump) from [<8017bcb0>] (do_raw_spin_unlock+0x108/0x130) [ 82.185314] r5:edb4899c r4:edb4899c [ 82.188938] [<8017bba8>] (do_raw_spin_unlock) from [<8094b93c>] (_raw_spin_unlock_irqrestore+0x34/0x54) [ 82.198333] r5:edb4899c r4:600a0013 [ 82.201953] [<8094b908>] (_raw_spin_unlock_irqrestore) from [<8065b090>] (rx8010_set_time+0x14c/0x188) [ 82.211261] r5:00000020 r4:edb48990 [ 82.214882] [<8065af44>] (rx8010_set_time) from [<80653fe4>] (rtc_set_time+0x70/0x104) [ 82.222801] r7:00000051 r6:edb39da0 r5:edb39c00 r4:ec937e8c [ 82.228535] [<80653f74>] (rtc_set_time) from [<80655774>] (rtc_dev_ioctl+0x3c4/0x674) [ 82.236368] r7:00000051 r6:7ecf1b74 r5:00000000 r4:edb39c00 [ 82.242106] [<806553b0>] (rtc_dev_ioctl) from [<80284034>] (do_vfs_ioctl+0xa4/0xa6c) [ 82.249851] r8:00000003 r7:80284a40 r6:ed1e9c80 r5:edb44e60 r4:7ecf1b74 [ 82.256642] [<80283f90>] (do_vfs_ioctl) from [<80284a40>] (SyS_ioctl+0x44/0x6c) [ 82.263953] r10:00000000 r9:ec936000 r8:7ecf1b74 r7:4024700a r6:ed1e9c80 r5:00000003 [ 82.271869] r4:ed1e9c80 [ 82.274432] [<802849fc>] (SyS_ioctl) from [<80108520>] (ret_fast_syscall+0x0/0x1c) [ 82.282005] r9:ec936000 r8:801086c4 r7:00000036 r6:00000000 r5:00000003 r4:0008e1bc root@GE004097290448 b850v3:~# Message from syslogd@GE004097290448 at Dec 3 11:17:08 ... kernel:[ 82.108175] BUG: spinlock wrong CPU on CPU#0, hwclock/855 Message from syslogd@GE004097290448 at Dec 3 11:17:08 ... kernel:[ 82.113660] lock: 0xedb4899c, .magic: dead4ead, .owner: hwclock/855, .owner_cpu: 1 hwclock --systohc root@GE004097290448 b850v3:~# Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.co.uk> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.