linux-kernel - "of/platform: Pause/resume sync state during init and of_platform

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Date:   Tue, 6 Aug 2019 20:46:20 -0400
From:   Qian Cai <cai@....pw>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>
Subject: "of/platform: Pause/resume sync state during init and
 of_platform_populate()" with a warning on arm64

It looks like the linux-next commit “of/platform: Pause/resume sync state during init and of_platform_populate()” [1]
Introduced a warning while booting arm64.

[1] https://lore.kernel.org/lkml/20190731221721.187713-6-saravanak@google.com/

[   93.449300][    T1] arm-smmu-v3 arm-smmu-v3.4.auto: ias 44-bit, oas 44-bit (features 0x0000170d)
[   93.464873][    T1] arm-smmu-v3 arm-smmu-v3.4.auto: allocated 524288 entries for cmdq
[   93.485481][    T1] arm-smmu-v3 arm-smmu-v3.4.auto: allocated 524288 entries for evtq
[   93.496320][    T1] arm-smmu-v3 arm-smmu-v3.5.auto: option mask 0x2
[   93.502917][    T1] arm-smmu-v3 arm-smmu-v3.5.auto: ias 44-bit, oas 44-bit (features 0x0000170d)
[   93.621818][    T1] arm-smmu-v3 arm-smmu-v3.5.auto: allocated 524288 entries for cmdq
[   93.643000][    T1] arm-smmu-v3 arm-smmu-v3.5.auto: allocated 524288 entries for evtq
[   94.519445][    T1] libphy: Fixed MDIO Bus: probed
[   94.524649][    T1] EFI Variables Facility v0.08 2004-May-17
[   94.601166][    T1] NET: Registered protocol family 17
[   94.766008][    T1] zswap: loaded using pool lzo/zbud
[   94.774745][    T1] kmemleak: Kernel memory leak detector initialized (mempool size: 16384)
[   94.774756][ T1699] kmemleak: Automatic memory scanning thread started
[   94.812338][ T1368] pcieport 0000:0f:00.0: Adding to iommu group 0
[   94.984466][    T1] ------------[ cut here ]------------
[   94.989827][    T1] Unmatched sync_state pause/resume!
[   94.989894][    T1] WARNING: CPU: 25 PID: 1 at drivers/base/core.c:691 device_links_supplier_sync_state_resume+0x100/0x128
[   95.006062][    T1] Modules linked in:
[   95.009815][    T1] CPU: 25 PID: 1 Comm: swapper/0 Not tainted 5.3.0-rc3-next-20190806+ #11
[   95.018161][    T1] Hardware name: HPE Apollo 70             /C01_APACHE_MB         , BIOS L50_5.13_1.11 06/18/2019
[   95.028593][    T1] pstate: 60400009 (nZCv daif +PAN -UAO)
[   95.034077][    T1] pc : device_links_supplier_sync_state_resume+0x100/0x128
[   95.041124][    T1] lr : device_links_supplier_sync_state_resume+0x100/0x128
[   95.048167][    T1] sp : 34ff800806e6fbc0
[   95.052172][    T1] x29: 34ff800806e6fc00 x28: 0000000000000000 
[   95.058177][    T1] x27: 0000000000000000 x26: 0000000000000000 
[   95.064181][    T1] x25: 0000000000000038 x24: 0000000000000000 
[   95.070185][    T1] x23: 0000000000000000 x22: 0000000000000019 
[   95.076189][    T1] x21: 0000000000000000 x20: f9ff808b804e6c50 
[   95.082193][    T1] x19: ffff100014a6e600 x18: 0000000000000040 
[   95.088197][    T1] x17: 0000000000000000 x16: 86ff80099d581b50 
[   95.094201][    T1] x15: 0000000000000000 x14: ffff100010086d1c 
[   95.100205][    T1] x13: ffff1000109d8688 x12: ffffffffffffffff 
[   95.106209][    T1] x11: 00000000000000f9 x10: ffff0808b804e6c6 
[   95.112213][    T1] x9 : 4b71ad522c851d00 x8 : 4b71ad522c851d00 
[   95.118217][    T1] x7 : 6170206574617473 x6 : ffff100014076972 
[   95.124221][    T1] x5 : 34ff800806e6f8f0 x4 : 000000000000000f 
[   95.130225][    T1] x3 : ffff1000101bfa5c x2 : 0000000000000001 
[   95.136229][    T1] x1 : 0000000000000001 x0 : 0000000000000022 
[   95.142233][    T1] Call trace:
[   95.145374][    T1]  device_links_supplier_sync_state_resume+0x100/0x128
[   95.152074][    T1]  of_platform_sync_state_init+0x10/0x1c
[   95.157557][    T1]  do_one_initcall+0x2f8/0x600
[   95.162172][    T1]  do_initcall_level+0x37c/0x3fc
[   95.166959][    T1]  do_basic_setup+0x34/0x4c
[   95.171313][    T1]  kernel_init_freeable+0x188/0x24c
[   95.176363][    T1]  kernel_init+0x18/0x334
[   95.180543][    T1]  ret_from_fork+0x10/0x18
[   95.184809][    T1] ---[ end trace a9ea68c902540fe5 ]---
[   95.269085][    T1] Freeing unused kernel memory: 28672K
[  101.069860][    T1] Checked W+X mappings: passed, no W+X pages found
[  101.076265][    T1] Run /init as init process
[  101.186359][    T1] systemd[1]: System time before build time, advancing clock.