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| author |   Arnd Bergmann <arnd@arndb.de> | 2022-05-23 21:59:02 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2022-06-28 13:20:21 +0200 |
| commit | 4313a24985f00340eeb591fd66aa2b257b9e0a69 (patch) | |
| tree | e928f62456119eba18604dc474ab018d9c572ac1 /mm/Kconfig | |
| parent | Merge branch 'asm-generic-mmiotrace' into asm-generic (diff) | |
| download | linux-dev-4313a24985f00340eeb591fd66aa2b257b9e0a69.tar.xz linux-dev-4313a24985f00340eeb591fd66aa2b257b9e0a69.zip | |
arch/*/: remove CONFIG_VIRT_TO_BUS
All architecture-independent users of virt_to_bus() and bus_to_virt()
have been fixed to use the dma mapping interfaces or have been
removed now. This means the definitions on most architectures, and the
CONFIG_VIRT_TO_BUS symbol are now obsolete and can be removed.
The only exceptions to this are a few network and scsi drivers for m68k
Amiga and VME machines and ppc32 Macintosh. These drivers work correctly
with the old interfaces and are probably not worth changing.
On alpha and parisc, virt_to_bus() were still used in asm/floppy.h.
alpha can use isa_virt_to_bus() like x86 does, and parisc can just
open-code the virt_to_phys() here, as this is architecture specific
code.
I tried updating the bus-virt-phys-mapping.rst documentation, which
started as an email from Linus to explain some details of the Linux-2.0
driver interfaces. The bits about virt_to_bus() were declared obsolete
backin 2000, and the rest is not all that relevant any more, so in the
end I just decided to remove the file completely.
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Acked-by: Helge Deller <deller@gmx.de> # parisc
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'mm/Kconfig')
| -rw-r--r-- | mm/Kconfig | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index 169e64192e48..b7a44b17c79f 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -639,14 +639,6 @@ config BOUNCE memory available to the CPU. Enabled by default when HIGHMEM is selected, but you may say n to override this. -config VIRT_TO_BUS - bool - help - An architecture should select this if it implements the - deprecated interface virt_to_bus(). All new architectures - should probably not select this. - - config MMU_NOTIFIER bool select SRCU |