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um: Use real DMA barriers 

When we have virtio enabled, we must have real barriers since we
may be running on an SMP machine (quite likely are, in fact), so
the other process can be on another CPU.

Since in any other case we don't really use DMA barriers, remove
their override completely so real barriers will get used. In the
future we might need them for other cases as well.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Johannes Berg 2019-09-11 14:51:19 +02:00 committed by Richard Weinberger
parent a30cc14fe4
commit 851b6cb17c
1 changed files with 0 additions and 3 deletions
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3
arch/x86/um/asm/barrier.h
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@ -23,9 +23,6 @@
#endif /* CONFIG_X86_32 */
#define dma_rmb() barrier()
#define dma_wmb() barrier()
#include <asm-generic/barrier.h>
#endif