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Subject"ftrace: Rework event_create_dir()" triggers boot error messages
Date
The linux-next commit "ftrace: Rework event_create_dir()” [1] triggers boot warnings
for Clang-build (Clang version 8.0.1) kernels (reproduced on both arm64 and powerpc).
Reverted it (with trivial conflict fixes) on the top of today’s linux-next fixed the issue.

configs:
https://raw.githubusercontent.com/cailca/linux-mm/master/arm64.config
https://raw.githubusercontent.com/cailca/linux-mm/master/powerpc.config

[1] https://lore.kernel.org/lkml/20191111132458.342979914@infradead.org/

[ 115.799327][ T1] Registered efivars operations
[ 115.849770][ T1] clocksource: Switched to clocksource arch_sys_counter
[ 115.901145][ T1] Could not initialize trace point events/sys_enter_rt_sigreturn
[ 115.908854][ T1] Could not create directory for event sys_enter_rt_sigreturn
[ 115.998949][ T1] Could not initialize trace point events/sys_enter_restart_syscall
[ 116.006802][ T1] Could not create directory for event sys_enter_restart_syscall
[ 116.062702][ T1] Could not initialize trace point events/sys_enter_getpid
[ 116.069828][ T1] Could not create directory for event sys_enter_getpid
[ 116.078058][ T1] Could not initialize trace point events/sys_enter_gettid
[ 116.085181][ T1] Could not create directory for event sys_enter_gettid
[ 116.093405][ T1] Could not initialize trace point events/sys_enter_getppid
[ 116.100612][ T1] Could not create directory for event sys_enter_getppid
[ 116.108989][ T1] Could not initialize trace point events/sys_enter_getuid
[ 116.116058][ T1] Could not create directory for event sys_enter_getuid
[ 116.124250][ T1] Could not initialize trace point events/sys_enter_geteuid
[ 116.131457][ T1] Could not create directory for event sys_enter_geteuid
[ 116.139840][ T1] Could not initialize trace point events/sys_enter_getgid
[ 116.146908][ T1] Could not create directory for event sys_enter_getgid
[ 116.155163][ T1] Could not initialize trace point events/sys_enter_getegid
[ 116.162370][ T1] Could not create directory for event sys_enter_getegid
[ 116.178015][ T1] Could not initialize trace point events/sys_enter_setsid
[ 116.185138][ T1] Could not create directory for event sys_enter_setsid
[ 116.269307][ T1] Could not initialize trace point events/sys_enter_sched_yield
[ 116.276811][ T1] Could not create directory for event sys_enter_sched_yield
[ 116.527652][ T1] Could not initialize trace point events/sys_enter_munlockall
[ 116.535126][ T1] Could not create directory for event sys_enter_munlockall
[ 116.622096][ T1] Could not initialize trace point events/sys_enter_vhangup
[ 116.629307][ T1] Could not create directory for event sys_enter_vhangup
[ 116.783867][ T1] Could not initialize trace point events/sys_enter_sync
[ 116.790819][ T1] Could not create directory for event sys_enter_sync
[ 117.723402][ T1] pnp: PnP ACPI init
[ 117.736379][ T1] system 00:00: [mem 0x30000000-0x3fffffff window] could not be reserved
[ 126.020353][ T1] pnp: PnP ACPI: found 1 devices
[ 126.093919][ T1] NET: Registered protocol family 2
[ 126.180007][ T1] tcp_listen_portaddr_hash hash table entries: 65536 (order: 6, 4718592 bytes, vmalloc)
[ 126.206510][ T1] TCP established hash table entries: 524288 (order: 6, 4194304 bytes, vmalloc)
[ 126.227766][ T1] TCP bind hash table entries: 65536 (order: 6, 4194304 bytes, vmalloc)
[ 126.240146][ T1] TCP: Hash tables configured (established 524288 bind 65536)
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