/* (C) 1999-2001 Paul `Rusty' Russell * (C) 2002-2006 Netfilter Core Team * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include static bool icmp_in_range(const struct nf_conntrack_tuple *tuple, enum nf_nat_manip_type maniptype, const union nf_conntrack_man_proto *min, const union nf_conntrack_man_proto *max) { return ntohs(tuple->src.u.icmp.id) >= ntohs(min->icmp.id) && ntohs(tuple->src.u.icmp.id) <= ntohs(max->icmp.id); } static void icmp_unique_tuple(const struct nf_nat_l3proto *l3proto, struct nf_conntrack_tuple *tuple, const struct nf_nat_range *range, enum nf_nat_manip_type maniptype, const struct nf_conn *ct) { static u_int16_t id; unsigned int range_size; unsigned int i; range_size = ntohs(range->max_proto.icmp.id) - ntohs(range->min_proto.icmp.id) + 1; /* If no range specified... */ if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED)) range_size = 0xFFFF; for (i = 0; ; ++id) { tuple->src.u.icmp.id = htons(ntohs(range->min_proto.icmp.id) + (id % range_size)); if (++i == range_size || !nf_nat_used_tuple(tuple, ct)) return; } return; } static bool icmp_manip_pkt(struct sk_buff *skb, const struct nf_nat_l3proto *l3proto, unsigned int iphdroff, unsigned int hdroff, const struct nf_conntrack_tuple *tuple, enum nf_nat_manip_type maniptype) { struct icmphdr *hdr; if (!skb_make_writable(skb, hdroff + sizeof(*hdr))) return false; hdr = (struct icmphdr *)(skb->data + hdroff); inet_proto_csum_replace2(&hdr->checksum, skb, hdr->un.echo.id, tuple->src.u.icmp.id, false); hdr->un.echo.id = tuple->src.u.icmp.id; return true; } const struct nf_nat_l4proto nf_nat_l4proto_icmp = { .l4proto = IPPROTO_ICMP, .manip_pkt = icmp_manip_pkt, .in_range = icmp_in_range, .unique_tuple = icmp_unique_tuple, #if IS_ENABLED(CONFIG_NF_CT_NETLINK) .nlattr_to_range = nf_nat_l4proto_nlattr_to_range, #endif }; git/log/Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.txt'>
path: root/Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.txt
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authorVineet Gupta <vgupta@synopsys.com>2016-10-20 07:39:45 -0700
committerVineet Gupta <vgupta@synopsys.com>2016-10-24 09:24:26 -0700
commit91e040a79df73d371f70792f30380d4e44805250 (patch)
treeb2732eadb60fc5575c465a81cc637a899330c1b5 /Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.txt
parent1dec78585328db00e33fb18dc1a6deed0e2095a5 (diff)
ARC: syscall for userspace cmpxchg assist
Older ARC700 cores (ARC750 specifically) lack instructions to implement atomic r-w-w. This is problematic for userspace libraries such as NPTL which need atomic primitives. So enable them by providing kernel assist. This is costly but really the only sane soluton (othern than tight spinning using the otherwise availiable atomic exchange EX instruciton). Good thing is there are only a few of these cores running Linux out in the wild. This only works on UP systems. Reviewed-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.txt')