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Commit e5adb877 authored by Ralf Baechle's avatar Ralf Baechle
Browse files

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: default avatarRalf Baechle <ralf@linux-mips.org>
parent 7cf8053b

arch/mips/lib/memcpy.S

+15 −0
Original line number Diff line number Diff line
@@ -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>