It does look like a gcc bug -- -O0 makes it go away.
Details at http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29808
That's a different bug, gcc generates code that the assembler can't
handle. Might be an assembler bug.
It's the same thing, the code is taken from kvm_main.c:
static void load_fs(u16 sel)
{
asm ("mov %0, %%fs" : : "g"(sel)); <--- line 153
}
Like I said in GCC PR29808, it's invalid -- use "r" instead.
Segher
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