xhci: Use ilog2() rather than __ffs() for calculating SEGMENT_SHIFT
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@redhat.com> cc: Sarah Sharp <sarah.a.sharp@linux.intel.com> cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> cc: linux-usb@vger.kernel.org Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
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@ -1239,7 +1239,7 @@ union xhci_trb {
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/* Allow two commands + a link TRB, along with any reserved command TRBs */
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#define MAX_RSVD_CMD_TRBS (TRBS_PER_SEGMENT - 3)
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#define SEGMENT_SIZE (TRBS_PER_SEGMENT*16)
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#define SEGMENT_SHIFT (__ffs(SEGMENT_SIZE))
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#define SEGMENT_SHIFT (ilog2(SEGMENT_SIZE))
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/* TRB buffer pointers can't cross 64KB boundaries */
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#define TRB_MAX_BUFF_SHIFT 16
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#define TRB_MAX_BUFF_SIZE (1 << TRB_MAX_BUFF_SHIFT)
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