[patch 1/6] s390, block: disable fixed buffer mode when DMA supportis disabled

[David Rientjes]

dasd=fixedbuffers must create a SLAB_CACHE_DMA cache, which is not
possible if CONFIG_ZONE_DMA is disabled (a supported configuration
without 64-bit support).

If passed, emit a warning and disable fixed buffer mode.

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 drivers/s390/block/dasd_devmap.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -282,6 +282,11 @@ dasd_parse_keyword( char *parsestring ) {
 		return residual_str;
 	}
 	if (strncmp("fixedbuffers", parsestring, length) == 0) {
+#ifndef CONFIG_ZONE_DMA
+		DBF_EVENT(DBF_WARNING, "%s", "DMA support disabled, "
+					"fixed buffer mode disabled.");
+		return residual_str;
+#endif
 		if (dasd_page_cache)
 			return residual_str;
 		dasd_page_cache =
--
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