Closed
Description
| Bugzilla Link | 9258 |
| Resolution | DUPLICATE |
| Resolved on | Feb 21, 2011 16:10 |
| Version | trunk |
| OS | Linux |
| Blocks | #4440 |
| CC | @nlewycky |
Extended Description
Can't compile Xen:
arch/x86/xen/spinlock.c:284:14: error: unsupported inline asm: input with type 'int' matching output with type 'u8' (aka 'unsigned char')
: "1" (1)
^
Testcase:
typedef unsigned char u8;
struct arch_spinlock;
struct xen_spinlock {
unsigned char lock;
unsigned short spinners;
};
void foo(struct arch_spinlock *lock)
{
u8 oldval;
unsigned timeout;
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
asm("1: xchgb %1,%0\n"
" testb %1,%1\n"
" jz 3f\n"
"2: rep;nop\n"
" cmpb $0,%0\n"
" je 1b\n"
" dec %2\n"
" jnz 2b\n"
"3:\n"
: "+m" (xl->lock), "=q" (oldval), "+r" (timeout)
: "1" (1)
: "memory");
}