arch: hexagon: include: asm: add generic macro 'mmiowb' in "io.h"
Need dumy mmiowb(), or can not pass compiling, the related error with allmodconfig: CC [M] drivers/mmc/host/sdhci.o drivers/mmc/host/sdhci.c: In function 'sdhci_request': drivers/mmc/host/sdhci.c:1409:2: error: implicit declaration of function 'mmiowb' [-Werror=implicit-function-declaration] Signed-off-by: NChen Gang <gang.chen.5i5j@gmail.com> Signed-off-by: NRichard Kuo <rkuo@codeaurora.org>
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