09d97da660
After commit9f76779f24("MIPS: implement architecture-specific 'pci_remap_iospace()'"), there exists the following warning on the Loongson64 platform: loongson-pci 1a000000.pci: IO 0x0018020000..0x001803ffff -> 0x0000020000 loongson-pci 1a000000.pci: MEM 0x0040000000..0x007fffffff -> 0x0040000000 ------------[ cut here ]------------ WARNING: CPU: 2 PID: 1 at arch/mips/pci/pci-generic.c:55 pci_remap_iospace+0x84/0x90 resource start address is not zero ... Call Trace: [<ffffffff8020dc78>] show_stack+0x40/0x120 [<ffffffff80cf4a0c>] dump_stack_lvl+0x58/0x74 [<ffffffff8023a0b0>] __warn+0xe0/0x110 [<ffffffff80cee02c>] warn_slowpath_fmt+0xa4/0xd0 [<ffffffff80cecf24>] pci_remap_iospace+0x84/0x90 [<ffffffff807f9864>] devm_pci_remap_iospace+0x5c/0xb8 [<ffffffff808121b0>] devm_of_pci_bridge_init+0x178/0x1f8 [<ffffffff807f4000>] devm_pci_alloc_host_bridge+0x78/0x98 [<ffffffff80819454>] loongson_pci_probe+0x34/0x160 [<ffffffff809203cc>] platform_probe+0x6c/0xe0 [<ffffffff8091d5d4>] really_probe+0xbc/0x340 [<ffffffff8091d8f0>] __driver_probe_device+0x98/0x110 [<ffffffff8091d9b8>] driver_probe_device+0x50/0x118 [<ffffffff8091dea0>] __driver_attach+0x80/0x118 [<ffffffff8091b280>] bus_for_each_dev+0x80/0xc8 [<ffffffff8091c6d8>] bus_add_driver+0x130/0x210 [<ffffffff8091ead4>] driver_register+0x8c/0x150 [<ffffffff80200a8c>] do_one_initcall+0x54/0x288 [<ffffffff811a5320>] kernel_init_freeable+0x27c/0x2e4 [<ffffffff80cfc380>] kernel_init+0x2c/0x134 [<ffffffff80205a2c>] ret_from_kernel_thread+0x14/0x1c ---[ end trace e4a0efe10aa5cce6 ]--- loongson-pci 1a000000.pci: error -19: failed to map resource [io 0x20000-0x3ffff] We can see that the resource start address is 0x0000020000, because the ISA Bridge used the zero address which is defined in the dts file arch/mips/boot/dts/loongson/ls7a-pch.dtsi: ISA Bridge: /bus@10000000/isa@18000000 IO 0x0000000018000000..0x000000001801ffff -> 0x0000000000000000 Based on the above analysis, the architecture-specific pci_remap_iospace() is not suitable for Loongson64, we should only define pci_remap_iospace() for Ralink on MIPS based on the commit background. Fixes:9f76779f24("MIPS: implement architecture-specific 'pci_remap_iospace()'") Suggested-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Tested-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> Acked-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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.