Spare migration tests

[thirdparty/mdadm.git] / platform-intel.h

diff --git a/platform-intel.h b/platform-intel.h
index bbdc9f9508b4c95e6322b6ac5e8f776e4c939780..908843618de969bfc86120cecada0513a9d9c389 100644 (file)
--- a/platform-intel.h
+++ b/platform-intel.h
@@ -115,6 +115,55 @@ static inline int imsm_orom_has_chunk(const struct imsm_orom *orom, int chunk)
        return !!(orom->sss & (1 << (fs - 1)));
 }
 
+/**
+ * fls - find last (most-significant) bit set
+ * @x: the word to search
+ * The funciton is borrowed from Linux kernel code
+ * include/asm-generic/bitops/fls.h
+ */
+static inline int fls(int x)
+{
+       int r = 32;
+
+       if (!x)
+               return 0;
+       if (!(x & 0xffff0000u)) {
+               x <<= 16;
+               r -= 16;
+       }
+       if (!(x & 0xff000000u)) {
+               x <<= 8;
+               r -= 8;
+       }
+       if (!(x & 0xf0000000u)) {
+               x <<= 4;
+               r -= 4;
+       }
+       if (!(x & 0xc0000000u)) {
+               x <<= 2;
+               r -= 2;
+       }
+       if (!(x & 0x80000000u)) {
+               x <<= 1;
+               r -= 1;
+       }
+       return r;
+}
+
+/**
+ * imsm_orom_default_chunk - return the largest chunk size supported via orom
+ * @orom: orom pointer from find_imsm_orom
+ */
+static inline int imsm_orom_default_chunk(const struct imsm_orom *orom)
+{
+       int fs = fls(orom->sss);
+
+       if (!fs)
+               return 0;
+
+       return min(512, (1 << fs));
+}
+
 struct sys_dev {
        char *path;
        struct sys_dev *next;