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Tiezhu Yang 09d97da660 MIPS: Only define pci_remap_iospace() for Ralink 
After commit 9f76779f24 ("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>
2021-12-09 10:22:24 +01:00
arch MIPS: Only define pci_remap_iospace() for Ralink 2021-12-09 10:22:24 +01:00
block block: call rq_qos_done() before ref check in batch completions 2021-11-26 09:53:23 -07:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto Update to zstd-1.4.10 2021-11-13 15:32:30 -08:00
Documentation 5 ksmbd server fixes, 4 for stable 2021-11-27 14:49:35 -08:00
drivers vhost,virtio,vdpa: bugfixes 2021-11-28 11:58:52 -08:00
fs 5 ksmbd server fixes, 4 for stable 2021-11-27 14:49:35 -08:00
include vhost,virtio,vdpa: bugfixes 2021-11-28 11:58:52 -08:00
init kbuild: Fix -Wimplicit-fallthrough=5 error for GCC 5.x and 6.x 2021-11-14 18:59:49 -08:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-11-20 10:35:54 -08:00
kernel A single scheduler fix to ensure that there is no stale KASAN shadow state 2021-11-28 09:15:34 -08:00
lib parisc: Increase FRAME_WARN to 2048 bytes on parisc 2021-11-22 07:37:31 +01:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm Fixes for 5.16 folios: 2021-11-25 10:13:56 -08:00
net vhost,virtio,vdpa: bugfixes 2021-11-28 11:58:52 -08:00
samples s390 updates for 5.16-rc2 2021-11-20 10:55:50 -08:00
scripts Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid 2021-11-24 09:44:13 -08:00
security selinux: fix NULL-pointer dereference when hashtab allocation fails 2021-11-19 16:11:39 -05:00
sound xen: branch for v5.16-rc3 2021-11-26 09:54:13 -08:00
tools Networking fixes for 5.16-rc3, including fixes from netfilter. 2021-11-26 12:58:53 -08:00
usr initramfs: Check timestamp to prevent broken cpio archive 2021-10-24 13:48:40 +09:00
virt Merge branch 'kvm-5.16-fixes' into kvm-master 2021-11-18 02:11:57 -05:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap MAINTAINERS: update email address of Christian Borntraeger 2021-11-18 17:50:54 +01:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Networking fixes for 5.16-rc3, including fixes from netfilter. 2021-11-26 12:58:53 -08:00
Makefile Linux 5.16-rc3 2021-11-28 14:09:19 -08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

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.