[Xen-devel] [PATCH 5 of 6] [OCAML] Fix 2 bit-twiddling bugs and an off-by-one

[Jon Ludlam <jonathan.ludlam@xxxxxxxxxxxxx>]

The bit bugs are in ocaml vcpu affinity calls, and the off-by-one
error is in the ocaml console ring code

Signed-off-by: Zheng Li <zheng.li@xxxxxxxxxxxxx>
Acked-by: Jon Ludlam <jonathan.ludlam@xxxxxxxxxxxxx>

diff -r da67f075e413 -r fdca6d8c0c5a tools/ocaml/libs/xc/xenctrl_stubs.c
--- a/tools/ocaml/libs/xc/xenctrl_stubs.c
+++ b/tools/ocaml/libs/xc/xenctrl_stubs.c
@@ -430,7 +430,7 @@
 
        for (i=0; i<len; i++) {
                if (Bool_val(Field(cpumap, i)))
-                       c_cpumap[i/8] |= i << (i&7);
+                       c_cpumap[i/8] |= 1 << (i&7);
        }
        retval = xc_vcpu_setaffinity(_H(xch), _D(domid),
                                     Int_val(vcpu), c_cpumap);
@@ -466,7 +466,7 @@
        ret = caml_alloc(len, 0);
 
        for (i=0; i<len; i++) {
-               if (c_cpumap[i%8] & 1 << (i&7))
+               if (c_cpumap[i/8] & 1 << (i&7))
                        Store_field(ret, i, Val_true);
                else
                        Store_field(ret, i, Val_false);
@@ -523,7 +523,7 @@
 
 CAMLprim value stub_xc_readconsolering(value xch)
 {
-       unsigned int size = RING_SIZE;
+       unsigned int size = RING_SIZE - 1;
        char *ring_ptr = ring;
 
        CAMLparam1(xch);

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