From: David Howells <dhowells@xxxxxxxxxx>
Use ilog2() rather than __ffs() for calculating SEGMENT_SHIFT as ilog2() can
be worked out at compile time, whereas __ffs() must be calculated at runtime.
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
cc: linux-usb@xxxxxxxxxxxxxxx
Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 6358271..ca550dd 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1239,7 +1239,7 @@ union xhci_trb {
/* Allow two commands + a link TRB, along with any reserved command TRBs */
#define MAX_RSVD_CMD_TRBS (TRBS_PER_SEGMENT - 3)
#define SEGMENT_SIZE (TRBS_PER_SEGMENT*16)
-#define SEGMENT_SHIFT (__ffs(SEGMENT_SIZE))
+#define SEGMENT_SHIFT (ilog2(SEGMENT_SIZE))
/* TRB buffer pointers can't cross 64KB boundaries */
#define TRB_MAX_BUFF_SHIFT 16
#define TRB_MAX_BUFF_SIZE (1 << TRB_MAX_BUFF_SHIFT)
--
1.7.9
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
