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ffd0b25ca0
This reverts commit 3a3181e16f which
causes memory corruptions on POWER9 powernv. eg:
pci_bus 0035:08: busn_res: [bus 08-0c] is released
=============================================================================
BUG kmalloc-16 (Tainted: G W O ): Object already free
-----------------------------------------------------------------------------
Disabling lock debugging due to kernel taint
INFO: Allocated in pcibios_scan_phb+0x104/0x3e0 age=1960714 cpu=4 pid=1
__slab_alloc+0xa4/0xf0
__kmalloc+0x294/0x330
pcibios_scan_phb+0x104/0x3e0
pcibios_init+0x84/0x124
do_one_initcall+0xac/0x528
kernel_init_freeable+0x35c/0x3fc
kernel_init+0x24/0x148
ret_from_kernel_thread+0x5c/0x80
INFO: Freed in pcibios_remove_bus+0x70/0x90 age=0 cpu=16 pid=1717146
kfree+0x49c/0x510
pcibios_remove_bus+0x70/0x90
pci_remove_bus+0xe4/0x110
pci_remove_bus_device+0x74/0x170
pci_remove_bus_device+0x4c/0x170
pci_stop_and_remove_bus_device_locked+0x34/0x50
remove_store+0xc0/0xe0
dev_attr_store+0x30/0x50
sysfs_kf_write+0x68/0xb0
kernfs_fop_write+0x114/0x260
vfs_write+0xe4/0x260
ksys_write+0x74/0x130
system_call_exception+0xf8/0x1d0
system_call_common+0xe8/0x218
INFO: Slab 0x0000000099caaf22 objects=178 used=174 fp=0x00000000006a64b0 flags=0x7fff8000000201
INFO: Object 0x00000000f360132d @offset=30192 fp=0x0000000000000000
Signed-off-by: Qian Cai <cai@lca.pw>
Acked-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201014182811.12027-1-cai@lca.pw
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.