xref: /OK3568_Linux_fs/kernel/scripts/atomic/fallbacks/dec_if_positive (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyuncat <<EOF
2*4882a593Smuzhiyunstatic __always_inline ${ret}
3*4882a593Smuzhiyun${arch}${atomic}_dec_if_positive(${atomic}_t *v)
4*4882a593Smuzhiyun{
5*4882a593Smuzhiyun	${int} dec, c = ${arch}${atomic}_read(v);
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun	do {
8*4882a593Smuzhiyun		dec = c - 1;
9*4882a593Smuzhiyun		if (unlikely(dec < 0))
10*4882a593Smuzhiyun			break;
11*4882a593Smuzhiyun	} while (!${arch}${atomic}_try_cmpxchg(v, &c, dec));
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun	return dec;
14*4882a593Smuzhiyun}
15*4882a593SmuzhiyunEOF
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