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Message-Id: <229E1896-0C06-418A-B7DE-40AEBFB44F85@lca.pw>
Date: Fri, 8 May 2020 13:41:32 -0400
From: Qian Cai <cai@....pw>
To: Christophe Leroy <christophe.leroy@....fr>,
Michael Ellerman <mpe@...erman.id.au>
Cc: linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: ioremap() called early from pnv_pci_init_ioda_phb()
> On May 8, 2020, at 10:39 AM, Qian Cai <cai@....pw> wrote:
>
> Booting POWER9 PowerNV has this message,
>
> "ioremap() called early from pnv_pci_init_ioda_phb+0x420/0xdfc. Use early_ioremap() instead”
>
> but use the patch below will result in leaks because it will never call early_iounmap() anywhere. However, it looks me it was by design that phb->regs mapping would be there forever where it would be used in pnv_ioda_get_inval_reg(), so is just that check_early_ioremap_leak() initcall too strong?
>
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -36,6 +36,7 @@
> #include <asm/firmware.h>
> #include <asm/pnv-pci.h>
> #include <asm/mmzone.h>
> +#include <asm/early_ioremap.h>
>
> #include <misc/cxl-base.h>
>
> @@ -3827,7 +3828,7 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
> /* Get registers */
> if (!of_address_to_resource(np, 0, &r)) {
> phb->regs_phys = r.start;
> - phb->regs = ioremap(r.start, resource_size(&r));
> + phb->regs = early_ioremap(r.start, resource_size(&r));
> if (phb->regs == NULL)
> pr_err(" Failed to map registers !\n”);
This will also trigger a panic with debugfs reads, so isn’t that this commit bogus at least for powerpc64?
d538aadc2718 (“powerpc/ioremap: warn on early use of ioremap()")
11017.617022][T122068] Faulting instruction address: 0xc0000000000db564
[11017.617257][T122066] Faulting instruction address: 0xc0000000000db564
[11017.617950][T122073] Faulting instruction address: 0xc0000000000db564
[11017.618888][T122064] BUG: Unable to handle kernel data access on read at 0xffffffffffe20e10
[11017.618935][T122064] Faulting instruction address: 0xc0000000000db564
[11017.737996][T122072]
[11017.738010][T122073] Oops: Kernel access of bad area, sig: 11 [#2]
[11017.738024][T122073] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=256 DEBUG_PAGEALLOC NUMA PowerNV
[11017.738051][T122073] Modules linked in: brd ext4 crc16 mbcache jbd2 loop kvm_hv kvm ip_tables x_tables xfs sd_mod bnx2x ahci libahci tg3 mdio libata libphy firmware_class dm_mirror dm_region_hash dm_log dm_mod
[11017.738110][T122073] CPU: 108 PID: 122073 Comm: read_all Tainted: G D W 5.7.0-rc4-next-20200508+ #4
[11017.738138][T122073] NIP: c0000000000db564 LR: c00000000056f660 CTR: c0000000000db550
[11017.738173][T122073] REGS: c000000374f6f980 TRAP: 0380 Tainted: G D W (5.7.0-rc4-next-20200508+)
[11017.738234][T122073] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 22002282 XER: 20040000
[11017.738278][T122073] CFAR: c00000000056f65c IRQMASK: 0
[11017.738278][T122073] GPR00: c00000000056f660 c000000374f6fc10 c000000001689400 c000201ffc41aa00
[11017.738278][T122073] GPR04: c000000374f6fc70 0000000000000000 0000000000000000 0000000000000001
[11017.738278][T122073] GPR08: 0000000000000000 ffffffffffe20000 0000000000000000 c0000008ee380080
[11017.738278][T122073] GPR12: c0000000000db550 c000201fff671280 0000000000000000 0000000000000000
[11017.738278][T122073] GPR16: 0000000000000002 0000000010040800 000000001001ccd8 000000001001cc80
[11017.738278][T122073] GPR20: 000000001001cc98 000000001001ccc8 000000001001cca8 000000001001cb48
[11017.738278][T122073] GPR24: 0000000000000000 0000000000000000 00000000000003ff 00007fffebb67390
[11017.738278][T122073] GPR28: c000000374f6fd90 c000200c0c6a7550 0000000000000000 c000200c0c6a7500
[11017.738542][T122073] NIP [c0000000000db564] pnv_eeh_dbgfs_get_inbB+0x14/0x30
[11017.738579][T122073] LR [c00000000056f660] simple_attr_read+0xa0/0x180
[11017.738613][T122073] Call Trace:
[11017.738645][T122073] [c000000374f6fc10] [c00000000056f630] simple_attr_read+0x70/0x180 (unreliable)
[11017.738672][T122073] [c000000374f6fcb0] [c00000000064a2e0] full_proxy_read+0x90/0xe0
[11017.738686][T122073] [c000000374f6fd00] [c00000000051fe0c] __vfs_read+0x3c/0x70
[11017.738722][T122073] [c000000374f6fd20] [c00000000051feec] vfs_read+0xac/0x170
[11017.738757][T122073] [c000000374f6fd70] [c00000000052034c] ksys_read+0x7c/0x140
[11017.738818][T122073] [c000000374f6fdc0] [c000000000038af4] system_call_exception+0x114/0x1e0
[11017.738867][T122073] [c000000374f6fe20] [c00000000000c8f0] system_call_common+0xf0/0x278
[11017.738916][T122073] Instruction dump:
[11017.738948][T122073] 7c0004ac f9490d10 a14d0c78 38600000 b14d0c7a 4e800020 60000000 7c0802a6
[11017.739001][T122073] 60000000 e9230278 e9290028 7c0004ac <e9290e10> 0c090000 4c00012c 38600000
[11017.739052][T122073] ---[ end trace f68728a0d3053b5e ]---
[11017.828156][T122073]
[11017.828170][T122068] Oops: Kernel access of bad area, sig: 11 [#3]
[11017.828184][T122068] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=256 DEBUG_PAGEALLOC NUMA PowerNV
[11017.828209][T122068] Modules linked in: brd ext4 crc16 mbcache jbd2 loop kvm_hv kvm ip_tables x_tables xfs sd_mod bnx2x ahci libahci tg3 mdio libata libphy firmware_class dm_mirror dm_region_hash dm_log dm_mod
[11017.828265][T122068] CPU: 88 PID: 122068 Comm: read_all Tainted: G D W 5.7.0-rc4-next-20200508+ #4
[11017.828303][T122068] NIP: c0000000000db564 LR: c00000000056f660 CTR: c0000000000db550
[11017.828338][T122068] REGS: c000001ea20cf980 TRAP: 0380 Tainted: G D W (5.7.0-rc4-next-20200508+)
[11017.828386][T122068] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 22002282 XER: 20040000
[11017.828437][T122068] CFAR: c00000000056f65c IRQMASK: 0
[11017.828437][T122068] GPR00: c00000000056f660 c000001ea20cfc10 c000000001689400 c000201ffc41aa00
[11017.828437][T122068] GPR04: c000001ea20cfc70 0000000000000000 0000000000000000 0000000000000001
[11017.828437][T122068] GPR08: 0000000000000000 ffffffffffe20000 0000000000000000 c0000018930e8880
[11017.828437][T122068] GPR12: c0000000000db550 c000201fff691100 0000000000000000 0000000000000000
[11017.828437][T122068] GPR16: 0000000000000002 0000000010040800 000000001001ccd8 000000001001cc80
[11017.828437][T122068] GPR20: 000000001001cc98 000000001001ccc8 000000001001cca8 000000001001cb48
[11017.828437][T122068] GPR24: 0000000000000000 0000000000000000 00000000000003ff 00007fffebb67390
[11017.828437][T122068] GPR28: c000001ea20cfd90 c000200c0c6a4150 0000000000000000 c000200c0c6a4100
[11017.828808][T122068] NIP [c0000000000db564] pnv_eeh_dbgfs_get_inbB+0x14/0x30
[11017.828856][T122068] LR [c00000000056f660] simple_attr_read+0xa0/0x180
[11017.828901][T122068] Call Trace:
[11017.828921][T122068] [c000001ea20cfc10] [c00000000056f630] simple_attr_read+0x70/0x180 (unreliable)
[11017.828983][T122068] [c000001ea20cfcb0] [c00000000064a2e0] full_proxy_read+0x90/0xe0
[11017.829030][T122068] [c000001ea20cfd00] [c00000000051fe0c] __vfs_read+0x3c/0x70
[11017.829043][T122068] [c000001ea20cfd20] [c00000000051feec] vfs_read+0xac/0x170
[11017.829056][T122068] [c000001ea20cfd70] [c00000000052034c] ksys_read+0x7c/0x140
[11017.829116][T122068] [c000001ea20cfdc0] [c000000000038af4] system_call_exception+0x114/0x1e0
[11017.829153][T122068] [c000001ea20cfe20] [c00000000000c8f0] system_call_common+0xf0/0x278
[11017.829215][T122068] Instruction dump:
[11017.829234][T122068] 7c0004ac f9490d10 a14d0c78 38600000 b14d0c7a 4e800020 60000000 7c0802a6
[11017.829264][T122068] 60000000 e9230278 e9290028 7c0004ac <e9290e10> 0c090000 4c00012c 38600000
[11017.829281][T122068] ---[ end trace f68728a0d3053b5f ]---
[11017.928173][T122068]
[11017.928186][T122064] Oops: Kernel access of bad area, sig: 11 [#4]
[11017.928198][T122064] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=256 DEBUG_PAGEALLOC NUMA PowerNV
[11017.928211][T122064] Modules linked in: brd ext4 crc16 mbcache jbd2 loop kvm_hv kvm ip_tables x_tables xfs sd_mod bnx2x ahci libahci tg3 mdio libata libphy firmware_class dm_mirror dm_region_hash dm_log dm_mod
[11017.928263][T122064] CPU: 120 PID: 122064 Comm: read_all Tainted: G D W 5.7.0-rc4-next-20200508+ #4
[11017.928303][T122064] NIP: c0000000000db564 LR: c00000000056f660 CTR: c0000000000db550
[11017.928351][T122064] REGS: c000000978bef980 TRAP: 0380 Tainted: G D W (5.7.0-rc4-next-20200508+)
[11017.928387][T122064] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 22002282 XER: 20040000
[11017.928416][T122064] CFAR: c00000000056f65c IRQMASK: 0
[11017.928416][T122064] GPR00: c00000000056f660 c000000978befc10 c000000001689400 c000201ffc41aa00
[11017.928416][T122064] GPR04: c000000978befc70 0000000000000000 0000000000000000 0000000000000001
[11017.928416][T122064] GPR08: 0000000000000000 ffffffffffe20000 0000000000000000 c0000018930eaa80
[11017.928416][T122064] GPR12: c0000000000db550 c000201fff667c80 0000000000000000 0000000000000000
[11017.928416][T122064] GPR16: 0000000000000002 0000000010040800 000000001001ccd8 000000001001cc80
[11017.928416][T122064] GPR20: 000000001001cc98 000000001001ccc8 000000001001cca8 000000001001cb48
[11017.928416][T122064] GPR24: 0000000000000000 0000000000000000 00000000000003ff 00007fffebb67390
[11017.928416][T122064] GPR28: c000000978befd90 c000200c0c6a2550 0000000000000000 c000200c0c6a2500
[11017.928630][T122064] NIP [c0000000000db564] pnv_eeh_dbgfs_get_inbB+0x14/0x30
[11017.928657][T122064] LR [c00000000056f660] simple_attr_read+0xa0/0x180
[11017.928691][T122064] Call Trace:
[11017.928711][T122064] [c000000978befc10] [c00000000056f630] simple_attr_read+0x70/0x180 (unreliable)
[11017.928749][T122064] [c000000978befcb0] [c00000000064a2e0] full_proxy_read+0x90/0xe0
[11017.928810][T122064] [c000000978befd00] [c00000000051fe0c] __vfs_read+0x3c/0x70
[11017.928845][T122064] [c000000978befd20] [c00000000051feec] vfs_read+0xac/0x170
[11017.928896][T122064] [c000000978befd70] [c00000000052034c] ksys_read+0x7c/0x140
[11017.928946][T122064] [c000000978befdc0] [c000000000038af4] system_call_exception+0x114/0x1e0
[11017.928982][T122064] [c000000978befe20] [c00000000000c8f0] system_call_common+0xf0/0x278
[11017.928994][T122064] Instruction dump:
[11017.929014][T122064] 7c0004ac f9490d10 a14d0c78 38600000 b14d0c7a 4e800020 60000000 7c0802a6
[11017.929068][T122064] 60000000 e9230278 e9290028 7c0004ac <e9290e10> 0c090000 4c00012c 38600000
[11017.929085][T122064] ---[ end trace f68728a0d3053b60 ]---
[11018.018131][T122064]
[11018.018143][T122067] Oops: Kernel access of bad area, sig: 11 [#5]
[11018.018155][T122067] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=256 DEBUG_PAGEALLOC NUMA PowerNV
[11018.018178][T122067] Modules linked in: brd ext4 crc16 mbcache jbd2 loop kvm_hv kvm ip_tables x_tables xfs sd_mod bnx2x ahci libahci tg3 mdio libata libphy firmware_class dm_mirror dm_region_hash dm_log dm_mod
[11018.018231][T122067] CPU: 60 PID: 122067 Comm: read_all Tainted: G D W 5.7.0-rc4-next-20200508+ #4
[11018.018254][T122067] NIP: c0000000000db564 LR: c00000000056f660 CTR: c0000000000db550
[11018.018275][T122067] REGS: c000000e5a06f980 TRAP: 0380 Tainted: G D W (5.7.0-rc4-next-20200508+)
[11018.018307][T122067] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 22002282 XER: 20040000
[11018.018336][T122067] CFAR: c00000000056f65c IRQMASK: 0
[11018.018336][T122067] GPR00: c00000000056f660 c000000e5a06fc10 c000000001689400 c000201ffc41aa00
[11018.018336][T122067] GPR04: c000000e5a06fc70 0000000000000000 0000000000000000 0000000000000001
[11018.018336][T122067] GPR08: 0000000000000000 ffffffffffe20000 0000000000000000 c0000018930ecc80
[11018.018336][T122067] GPR12: c0000000000db550 c000001ffffcf200 0000000000000000 0000000000000000
[11018.018336][T122067] GPR16: 0000000000000002 0000000010040800 000000001001ccd8 000000001001cc80
[11018.018336][T122067] GPR20: 000000001001cc98 000000001001ccc8 000000001001cca8 000000001001cb48
[11018.018336][T122067] GPR24: 0000000000000000 0000000000000000 00000000000003ff 00007fffebb67390
[11018.018336][T122067] GPR28: c000000e5a06fd90 c000000007de7550 0000000000000000 c000000007de7500
[11018.018552][T122067] NIP [c0000000000db564] pnv_eeh_dbgfs_get_inbB+0x14/0x30
[11018.018574][T122067] LR [c00000000056f660] simple_attr_read+0xa0/0x180
[11018.018602][T122067] Call Trace:
[11018.018619][T122067] [c000000e5a06fc10] [c00000000056f630] simple_attr_read+0x70/0x180 (unreliable)
[11018.018652][T122067] [c000000e5a06fcb0] [c00000000064a2e0] full_proxy_read+0x90/0xe0
[11018.018674][T122067] [c000000e5a06fd00] [c00000000051fe0c] __vfs_read+0x3c/0x70
[11018.018686][T122067] [c000000e5a06fd20] [c00000000051feec] vfs_read+0xac/0x170
[11018.018716][T122067] [c000000e5a06fd70] [c00000000052034c] ksys_read+0x7c/0x140
[11018.018747][T122067] [c000000e5a06fdc0] [c000000000038af4] system_call_exception+0x114/0x1e0
[11018.018779][T122067] [c000000e5a06fe20] [c00000000000c8f0] system_call_common+0xf0/0x278
[11018.018808][T122067] Instruction dump:
[11018.018825][T122067] 7c0004ac f9490d10 a14d0c78 38600000 b14d0c7a 4e800020 60000000 7c0802a6
[11018.018850][T122067] 60000000 e9230278 e9290028 7c0004ac <e9290e10> 0c090000 4c00012c 38600000
[11018.018875][T122067] ---[ end trace f68728a0d3053b61 ]---
[11018.108865][T122067]
[11018.108875][T122070] Oops: Kernel access of bad area, sig: 11 [#6]
[11018.108887][T122070] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=256 DEBUG_PAGEALLOC NUMA PowerNV
[11018.108909][T122070] Modules linked in: brd ext4 crc16 mbcache jbd2 loop kvm_hv kvm ip_tables x_tables xfs sd_mod bnx2x ahci libahci tg3 mdio libata libphy firmware_class dm_mirror dm_region_hash dm_log dm_mod
[11018.108949][T122070] CPU: 36 PID: 122070 Comm: read_all Tainted: G D W 5.7.0-rc4-next-20200508+ #4
[11018.108981][T122070] NIP: c0000000000db564 LR: c00000000056f660 CTR: c0000000000db550
[11018.109002][T122070] REGS: c000000a3628f980 TRAP: 0380 Tainted: G D W (5.7.0-rc4-next-20200508+)
[11018.109043][T122070] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 22002282 XER: 20040000
[11018.109077][T122070] CFAR: c00000000056f65c IRQMASK: 0
[11018.109077][T122070] GPR00: c00000000056f660 c000000a3628fc10 c000000001689400 c000201ffc41aa00
[11018.109077][T122070] GPR04: c000000a3628fc70 0000000000000000 0000000000000000 0000000000000001
[11018.109077][T122070] GPR08: 0000000000000000 ffffffffffe20000 0000000000000000 c0000008ee384480
[11018.109077][T122070] GPR12: c0000000000db550 c000001ffffe1e00 0000000000000000 0000000000000000
[11018.109077][T122070] GPR16: 0000000000000002 0000000010040800 000000001001ccd8 000000001001cc80
[11018.109077][T122070] GPR20: 000000001001cc98 000000001001ccc8 000000001001cca8 000000001001cb48
[11018.109077][T122070] GPR24: 0000000000000000 0000000000000000 00000000000003ff 00007fffebb67390
[11018.109077][T122070] GPR28: c000000a3628fd90 c0000002f5243950 0000000000000000 c0000002f5243900
[11018.109256][T122070] NIP [c0000000000db564] pnv_eeh_dbgfs_get_inbB+0x14/0x30
[11018.109277][T122070] LR [c00000000056f660] simple_attr_read+0xa0/0x180
[11018.109296][T122070] Call Trace:
[11018.109314][T122070] [c000000a3628fc10] [c00000000056f630] simple_attr_read+0x70/0x180 (unreliable)
[11018.109346][T122070] [c000000a3628fcb0] [c00000000064a2e0] full_proxy_read+0x90/0xe0
[11018.109377][T122070] [c000000a3628fd00] [c00000000051fe0c] __vfs_read+0x3c/0x70
[11018.109417][T122070] [c000000a3628fd20] [c00000000051feec] vfs_read+0xac/0x170
[11018.109447][T122070] [c000000a3628fd70] [c00000000052034c] ksys_read+0x7c/0x140
[11018.109478][T122070] [c000000a3628fdc0] [c000000000038af4] system_call_exception+0x114/0x1e0
[11018.109510][T122070] [c000000a3628fe20] [c00000000000c8f0] system_call_common+0xf0/0x278
[11018.109548][T122070] Instruction dump:
[11018.109565][T122070] 7c0004ac f9490d10 a14d0c78 38600000 b14d0c7a 4e800020 60000000 7c0802a6
[11018.109599][T122070] 60000000 e9230278 e9290028 7c0004ac <e9290e10> 0c090000 4c00012c 38600000
[11018.109628][T122070] ---[ end trace f68728a0d3053b62 ]---
[11018.238625][T122070]
[11018.238635][T122069] Oops: Kernel access of bad area, sig: 11 [#7]
[11018.238646][T122069] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=256 DEBUG_PAGEALLOC NUMA PowerNV
[11018.238668][T122069] Modules linked in: brd ext4 crc16 mbcache jbd2 loop kvm_hv kvm ip_tables x_tables xfs sd_mod bnx2x ahci libahci tg3 mdio libata libphy firmware_class dm_mirror dm_region_hash dm_log dm_mod
[11018.238708][T122069] CPU: 48 PID: 122069 Comm: read_all Tainted: G D W 5.7.0-rc4-next-20200508+ #4
[11018.238732][T122069] NIP: c0000000000db564 LR: c00000000056f660 CTR: c0000000000db550
[11018.238761][T122069] REGS: c000001bf2e8f980 TRAP: 0380 Tainted: G D W (5.7.0-rc4-next-20200508+)
[11018.238793][T122069] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 22002282 XER: 20040000
[11018.238827][T122069] CFAR: c00000000056f65c IRQMASK: 0
[11018.238827][T122069] GPR00: c00000000056f660 c000001bf2e8fc10 c000000001689400 c000201ffc41aa00
[11018.238827][T122069] GPR04: c000001bf2e8fc70 0000000000000000 000000001ab703be ffffffff00018a2f
[11018.238827][T122069] GPR08: 000000006c4a22da ffffffffffe20000 0000000000000000 0000000000000002
[11018.238827][T122069] GPR12: c0000000000db550 c000001ffffd8800 0000000000000000 0000000000000000
[11018.238827][T122069] GPR16: 0000000000000002 0000000010040800 000000001001ccd8 000000001001cc80
[11018.238827][T122069] GPR20: 000000001001cc98 000000001001ccc8 000000001001cca8 000000001001cb48
[11018.238827][T122069] GPR24: 0000000000000000 0000000000000000 00000000000003ff 00007fffebb67390
[11018.238827][T122069] GPR28: c000001bf2e8fd90 c0000015bff0c950 0000000000000000 c0000015bff0c900
[11018.239055][T122069] NIP [c0000000000db564] pnv_eeh_dbgfs_get_inbB+0x14/0x30
[11018.239086][T122069] LR [c00000000056f660] simple_attr_read+0xa0/0x180
[11018.239105][T122069] Call Trace:
[11018.239122][T122069] [c000001bf2e8fc10] [c00000000056f630] simple_attr_read+0x70/0x180 (unreliable)
[11018.239155][T122069] [c000001bf2e8fcb0] [c00000000064a2e0] full_proxy_read+0x90/0xe0
[11018.239186][T122069] [c000001bf2e8fd00] [c00000000051fe0c] __vfs_read+0x3c/0x70
[11018.239207][T122069] [c000001bf2e8fd20] [c00000000051feec] vfs_read+0xac/0x170
[11018.239228][T122069] [c000001bf2e8fd70] [c00000000052034c] ksys_read+0x7c/0x140
[11018.239240][T122069] [c000001bf2e8fdc0] [c000000000038af4] system_call_exception+0x114/0x1e0
[11018.239272][T122069] [c000001bf2e8fe20] [c00000000000c8f0] system_call_common+0xf0/0x278
[11018.239292][T122069] Instruction dump:
[11018.239309][T122069] 7c0004ac f9490d10 a14d0c78 38600000 b14d0c7a 4e800020 60000000 7c0802a6
[11018.239342][T122069] 60000000 e9230278 e9290028 7c0004ac <e9290e10> 0c090000 4c00012c 38600000
[11018.239377][T122069] ---[ end trace f68728a0d3053b63 ]---
[11018.738011][T122072] Kernel panic - not syncing: Fatal exception
[11020.409414]
>
> [ 23.080069][ T1] ------------[ cut here ]------------
> [ 23.080089][ T1] Debug warning: early ioremap leak of 10 areas detected.
> [ 23.080089][ T1] please boot with early_ioremap_debug and report the dmesg.
> [ 23.080157][ T1] WARNING: CPU: 4 PID: 1 at mm/early_ioremap.c:99 check_early_ioremap_leak+0xd4/0x108
> [ 23.080171][ T1] Modules linked in:
> [ 23.080192][ T1] CPU: 4 PID: 1 Comm: swapper/0 Not tainted 5.7.0-rc4-next-20200508+ #4
> [ 23.080214][ T1] NIP: c00000000103f2d8 LR: c00000000103f2d4 CTR: 0000000000000000
> [ 23.080226][ T1] REGS: c00000003df0f860 TRAP: 0700 Not tainted (5.7.0-rc4-next-20200508+)
> [ 23.080259][ T1] MSR: 9000000000029033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 48000222 XER: 20040000
> [ 23.080296][ T1] CFAR: c00000000010d5a8 IRQMASK: 0
> [ 23.080296][ T1] GPR00: c00000000103f2d4 c00000003df0faf0 c000000001689400 0000000000000072
> [ 23.080296][ T1] GPR04: 0000000000000006 0000000000000000 c00000003df0f7e4 0000000000000004
> [ 23.080296][ T1] GPR08: 0000001ffbb60000 0000000000000000 c00000003dee6680 0000000000000002
> [ 23.080296][ T1] GPR12: 0000000000000000 c000001fffffae00 c000000001057860 c0000000010578b0
> [ 23.080296][ T1] GPR16: c000000001002d38 c0000000014f0660 c0000000014f0680 c0000000014f06a0
> [ 23.080296][ T1] GPR20: c0000000014f06c0 c0000000014f06e0 c0000000014f0700 c0000000014f0720
> [ 23.080296][ T1] GPR24: c000000000c4bc30 c000000486b82000 c0000000015a0fe0 c0000000015a0fc0
> [ 23.080296][ T1] GPR28: 0000000000000010 0000000000000010 c000000001061e30 000000000000000a
> [ 23.080507][ T1] NIP [c00000000103f2d8] check_early_ioremap_leak+0xd4/0x108
> [ 23.080530][ T1] LR [c00000000103f2d4] check_early_ioremap_leak+0xd0/0x108
> [ 23.080552][ T1] Call Trace:
> [ 23.080571][ T1] [c00000003df0faf0] [c00000000103f2d4] check_early_ioremap_leak+0xd0/0x108 (unreliable)
> [ 23.080607][ T1] [c00000003df0fb80] [c00000000001130c] do_one_initcall+0xcc/0x660
> [ 23.080648][ T1] [c00000003df0fc80] [c000000001004c18] kernel_init_freeable+0x480/0x568
> [ 23.080681][ T1] [c00000003df0fdb0] [c000000000012180] kernel_init+0x24/0x194
> [ 23.080713][ T1] [c00000003df0fe20] [c00000000000cb28] ret_from_kernel_thread+0x5c/0x74
>
> This is from the early_ioremap_debug dmesg.
>
> [ 0.000000][ T0] ------------[ cut here ]------------
> [ 0.000000][ T0] __early_ioremap(0x000600c3c0010000, 00010000) [0] => 00000000 + ffffffffffbe0000
> [ 0.000000][ T0] WARNING: CPU: 0 PID: 0 at mm/early_ioremap.c:162 __early_ioremap+0x2d8/0x408
> [ 0.000000][ T0] Modules linked in:
> [ 0.000000][ T0] CPU: 0 PID: 0 Comm: swapper Not tainted 5.7.0-rc4-next-20200508+ #4
> [ 0.000000][ T0] NIP: c00000000103f5e4 LR: c00000000103f5e0 CTR: c0000000001e77f0
> [ 0.000000][ T0] REGS: c00000000168f980 TRAP: 0700 Not tainted (5.7.0-rc4-next-20200508+)
> [ 0.000000][ T0] MSR: 9000000000021033 <SF,HV,ME,IR,DR,RI,LE> CR: 28000248 XER: 20040000
> [ 0.000000][ T0] CFAR: c00000000010d5a8 IRQMASK: 1
> [ 0.000000][ T0] GPR00: c00000000103f5e0 c00000000168fc10 c000000001689400 0000000000000050
> [ 0.000000][ T0] GPR04: c00000000152f6f8 0000000000000000 c00000000168f904 0000000000000000
> [ 0.000000][ T0] GPR08: 0000000000000000 0000000000000000 c00000000162f600 0000000000000002
> [ 0.000000][ T0] GPR12: c0000000001e77f0 c000000005b30000 0000000000000000 0000000000000000
> [ 0.000000][ T0] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000001000
> [ 0.000000][ T0] GPR20: 0000000000000000 80000000000001ae 0000000000000000 0000000000000000
> [ 0.000000][ T0] GPR24: 0000000000010000 c000000001061da8 0000000000000008 0000000000000008
> [ 0.000000][ T0] GPR28: 0000000000000000 c000000001061db0 0000000000000000 c000000001061eb8
> [ 0.000000][ T0] NIP [c00000000103f5e4] __early_ioremap+0x2d8/0x408
> [ 0.000000][ T0] LR [c00000000103f5e0] __early_ioremap+0x2d4/0x408
> [ 0.000000][ T0] Call Trace:
> [ 0.000000][ T0] [c00000000168fc10] [c00000000103f5e0] __early_ioremap+0x2d4/0x408 (unreliable)
> [ 0.000000][ T0] [c00000000168fcf0] [c00000000101d010] pnv_pci_init_ioda_phb+0x420/0xdfc
> [ 0.000000][ T0] [c00000000168fe10] [c00000000101c9b8] pnv_pci_init+0x12c/0x264
> [ 0.000000][ T0] [c00000000168fe40] [c000000001016c40] pnv_setup_arch+0x2e4/0x330
> [ 0.000000][ T0] [c00000000168fe80] [c000000001009dd0] setup_arch+0x3a0/0x3ec
> [ 0.000000][ T0] [c00000000168fef0] [c000000001003ed0] start_kernel+0xb0/0x978
> [ 0.000000][ T0] [c00000000168ff90] [c00000000000c790] start_here_common+0x1c/0x8c
> [ 0.000000][ T0] Instruction dump:
> [ 0.000000][ T0] 7d39ba14 3c82ff3c 3c62ff54 7f06c378 7f88e378 7fc7f378 38a10068 e9290110
> [ 0.000000][ T0] 38849e90 3863e8f0 4b0cdf65 60000000 <0fe00000> 2bbe000f 409d0018 3c62fff1
> [ 0.000000][ T0] irq event stamp: 0
> [ 0.000000][ T0] hardirqs last enabled at (0): [<0000000000000000>] 0x0
> [ 0.000000][ T0] hardirqs last disabled at (0): [<0000000000000000>] 0x0
> [ 0.000000][ T0] softirqs last enabled at (0): [<0000000000000000>] 0x0
> [ 0.000000][ T0] softirqs last disabled at (0): [<0000000000000000>] 0x0
>
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