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| author | Ralf Baechle <ralf@linux-mips.org> | 2005-10-20 22:55:26 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2005-10-29 19:32:50 +0100 |
| commit | e5adb8770e12169a6595a3ad5682541441bd1052 (patch) | |
| tree | 22aaae4e58f9d4054a474a5fa31d492e4b9e79a1 /arch/mips/lib | |
| parent | 7cf8053b8ee48a7f0e9d8ebc72c279fb2e168c25 (diff) | |
| download | linux-e5adb8770e12169a6595a3ad5682541441bd1052.tar.gz linux-e5adb8770e12169a6595a3ad5682541441bd1052.tar.bz2 linux-e5adb8770e12169a6595a3ad5682541441bd1052.zip | |
Hack to resolve longstanding prefetch issue
Prefetching may be fatal on some systems if we're prefetching beyond the
end of memory on some systems. It's also a seriously bad idea on non
dma-coherent systems.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/lib')
| -rw-r--r-- | arch/mips/lib/memcpy.S | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/mips/lib/memcpy.S b/arch/mips/lib/memcpy.S index a78865f76547..7f9aafa4d80e 100644 --- a/arch/mips/lib/memcpy.S +++ b/arch/mips/lib/memcpy.S @@ -13,6 +13,21 @@ * Mnemonic names for arguments to memcpy/__copy_user */ #include <linux/config.h> + +/* + * Hack to resolve longstanding prefetch issue + * + * Prefetching may be fatal on some systems if we're prefetching beyond the + * end of memory on some systems. It's also a seriously bad idea on non + * dma-coherent systems. + */ +#if !defined(CONFIG_DMA_COHERENT) || !defined(CONFIG_DMA_IP27) +#undef CONFIG_CPU_HAS_PREFETCH +#endif +#ifdef CONFIG_MIPS_MALTA +#undef CONFIG_CPU_HAS_PREFETCH +#endif + #include <asm/asm.h> #include <asm/asm-offsets.h> #include <asm/regdef.h> |