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Hack to resolve longstanding prefetch issue

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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>
This commit is contained in:
Ralf Baechle 2005-10-20 22:55:26 +01:00
parent 7cf8053b8e
commit e5adb8770e
1 changed files with 15 additions and 0 deletions
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15
arch/mips/lib/memcpy.S
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@ -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>