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authorArnd Bergmann <arnd@arndb.de>2022-05-23 22:59:02 +0300
committerArnd Bergmann <arnd@arndb.de>2022-06-28 14:20:21 +0300
commit4313a24985f00340eeb591fd66aa2b257b9e0a69 (patch)
treee928f62456119eba18604dc474ab018d9c572ac1 /arch/xtensa
parent93929fb6c4ef6211e96679f060c842f35fac7710 (diff)
downloadlinux-4313a24985f00340eeb591fd66aa2b257b9e0a69.tar.xz
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 'arch/xtensa')
-rw-r--r--arch/xtensa/Kconfig1
-rw-r--r--arch/xtensa/include/asm/io.h3
2 files changed, 0 insertions, 4 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 0b0f0172cced..92a24ed738a5 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -50,7 +50,6 @@ config XTENSA
select MODULES_USE_ELF_RELA
select PERF_USE_VMALLOC
select TRACE_IRQFLAGS_SUPPORT
- select VIRT_TO_BUS
help
Xtensa processors are 32-bit RISC machines designed by Tensilica
primarily for embedded systems. These processors are both
diff --git a/arch/xtensa/include/asm/io.h b/arch/xtensa/include/asm/io.h
index 54188e69b988..a5b707e1c0f4 100644
--- a/arch/xtensa/include/asm/io.h
+++ b/arch/xtensa/include/asm/io.h
@@ -63,9 +63,6 @@ static inline void iounmap(volatile void __iomem *addr)
xtensa_iounmap(addr);
}
-#define virt_to_bus virt_to_phys
-#define bus_to_virt phys_to_virt
-
#endif /* CONFIG_MMU */
#include <asm-generic/io.h>