• Yang Shi's avatar
    arm64: convert patch_lock to raw lock · abffa6f3
    Yang Shi authored
    When running kprobe test on arm64 rt kernel, it reports the below warning:
    
    root@qemu7:~# modprobe kprobe_example
    BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:917
    in_atomic(): 0, irqs_disabled(): 128, pid: 484, name: modprobe
    CPU: 0 PID: 484 Comm: modprobe Not tainted 4.1.6-rt5 #2
    Hardware name: linux,dummy-virt (DT)
    Call trace:
    [<ffffffc0000891b8>] dump_backtrace+0x0/0x128
    [<ffffffc000089300>] show_stack+0x20/0x30
    [<ffffffc00061dae8>] dump_stack+0x1c/0x28
    [<ffffffc0000bbad0>] ___might_sleep+0x120/0x198
    [<ffffffc0006223e8>] rt_spin_lock+0x28/0x40
    [<ffffffc000622b30>] __aarch64_insn_write+0x28/0x78
    [<ffffffc000622e48>] aarch64_insn_patch_text_nosync+0x18/0x48
    [<ffffffc000622ee8>] aarch64_insn_patch_text_cb+0x70/0xa0
    [<ffffffc000622f40>] aarch64_insn_patch_text_sync+0x28/0x48
    [<ffffffc0006236e0>] arch_arm_kprobe+0x38/0x48
    [<ffffffc00010e6f4>] arm_kprobe+0x34/0x50
    [<ffffffc000110374>] register_kprobe+0x4cc/0x5b8
    [<ffffffbffc002038>] kprobe_init+0x38/0x7c [kprobe_example]
    [<ffffffc000084240>] do_one_initcall+0x90/0x1b0
    [<ffffffc00061c498>] do_init_module+0x6c/0x1cc
    [<ffffffc0000fd0c0>] load_module+0x17f8/0x1db0
    [<ffffffc0000fd8cc>] SyS_finit_module+0xb4/0xc8
    
    Convert patch_lock to raw loc kto avoid this issue.
    
    Although the problem is found on rt kernel, the fix should be applicable to
    mainline kernel too.
    Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
    Signed-off-by: default avatarYang Shi <yang.shi@linaro.org>
    Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
    abffa6f3
insn.c 26.7 KB