From 5febf432df1cfa5b25d99b54c32103fafbdd0eb9 Mon Sep 17 00:00:00 2001 From: Miguel Ojeda Date: Sun, 16 Aug 2026 15:32:33 +0200 Subject: kbuild: rust: keep Rust objects out of Clang LTO with inline helpers Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit `objtool` errors such as: vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a: can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd The reason is that in such builds, the Clang invocation that compiles the combined Rust plus helpers bitcode emits LLVM bitcode (again) -- the final code generation happens in the linker's LTO step, which the `-mllvm` trap options passed to Clang do not reach. This, in turn, means that unreachable traps are missing, and the impossible paths do not merely fallthrough to the next symbol, but past the end of their own section, since LTO builds place each function in its own section. Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always emits machine code directly, with the traps in place. Assisted-by: LLM Cc: Gary Guo Cc: Boqun Feng Cc: Alice Ryhl Cc: Matthew Maurer Cc: Josh Poimboeuf Cc: Peter Zijlstra Cc: stable@vger.kernel.org Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust") Acked-by: Gary Guo Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org Signed-off-by: Miguel Ojeda --- include/net/netns/ipv6.h | 138 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 138 insertions(+) create mode 100644 include/net/netns/ipv6.h (limited to 'include/net/netns/ipv6.h') diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h new file mode 100644 index 000000000..ffda15318 --- /dev/null +++ b/include/net/netns/ipv6.h @@ -0,0 +1,138 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * ipv6 in net namespaces + */ + +#include + +#ifndef __NETNS_IPV6_H__ +#define __NETNS_IPV6_H__ +#include +#include + +struct ctl_table_header; + +struct netns_sysctl_ipv6 { +#ifdef CONFIG_SYSCTL + struct ctl_table_header *hdr; + struct ctl_table_header *route_hdr; + struct ctl_table_header *icmp_hdr; + struct ctl_table_header *frags_hdr; + struct ctl_table_header *xfrm6_hdr; +#endif + int flush_delay; + int ip6_rt_max_size; + int ip6_rt_gc_min_interval; + int ip6_rt_gc_timeout; + int ip6_rt_gc_interval; + int ip6_rt_gc_elasticity; + int ip6_rt_mtu_expires; + int ip6_rt_min_advmss; + u32 multipath_hash_fields; + u8 multipath_hash_policy; + + __cacheline_group_begin(sysctl_ipv6_flowlabel); + u8 flowlabel_consistency; + u8 auto_flowlabels; + u8 flowlabel_state_ranges; + __cacheline_group_end(sysctl_ipv6_flowlabel); + + u8 icmpv6_echo_ignore_all; + u8 icmpv6_echo_ignore_multicast; + u8 icmpv6_echo_ignore_anycast; + int icmpv6_time; + DECLARE_BITMAP(icmpv6_ratemask, ICMPV6_MSG_MAX + 1); + unsigned long *icmpv6_ratemask_ptr; + u8 anycast_src_echo_reply; + u8 bindv6only; + u8 ip_nonlocal_bind; + u8 fwmark_reflect; + int idgen_retries; + int idgen_delay; + int flowlabel_reflect; + int max_dst_opts_cnt; + int max_hbh_opts_cnt; + int max_dst_opts_len; + int max_hbh_opts_len; + int seg6_flowlabel; + u32 ioam6_id; + u64 ioam6_id_wide; + u8 skip_notify_on_dev_down; + u8 fib_notify_on_flag_change; + u8 icmpv6_error_anycast_as_unicast; + u8 icmpv6_errors_extension_mask; +}; + +struct netns_ipv6 { + /* Keep ip6_dst_ops at the beginning of netns_sysctl_ipv6 */ + struct dst_ops ip6_dst_ops; + + struct netns_sysctl_ipv6 sysctl; + struct ipv6_devconf *devconf_all; + struct ipv6_devconf *devconf_dflt; + struct inet_peer_base *peers; + struct fqdir *fqdir; + struct fib6_info *fib6_null_entry; + struct rt6_info *ip6_null_entry; + struct rt6_statistics *rt6_stats; + struct timer_list ip6_fib_timer; + struct hlist_head *fib_table_hash; + spinlock_t fib_table_hash_lock; + struct fib6_table *fib6_main_tbl; + struct list_head fib6_walkers; + rwlock_t fib6_walker_lock; + spinlock_t fib6_gc_lock; + atomic_t ip6_rt_gc_expire; + unsigned long ip6_rt_last_gc; + unsigned char flowlabel_has_excl; +#ifdef CONFIG_IPV6_MULTIPLE_TABLES + bool fib6_has_custom_rules; + unsigned int fib6_rules_require_fldissect; +#ifdef CONFIG_IPV6_SUBTREES + unsigned int fib6_routes_require_src; +#endif + struct rt6_info *ip6_prohibit_entry; + struct rt6_info *ip6_blk_hole_entry; + struct fib6_table *fib6_local_tbl; + struct fib_rules_ops *fib6_rules_ops; +#endif + struct sock *ndisc_sk; + struct sock *tcp_sk; + struct sock *igmp_sk; + struct sock *mc_autojoin_sk; + + struct hlist_head *inet6_addr_lst; + spinlock_t addrconf_hash_lock; + struct delayed_work addr_chk_work; + +#ifdef CONFIG_IPV6_MROUTE +#ifndef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES + struct mr_table *mrt6; +#else + struct list_head mr6_tables; + struct fib_rules_ops *mr6_rules_ops; +#endif + struct fib_notifier_ops *ip6mr_notifier_ops; + atomic_t ipmr_seq; + struct mutex mfc_mutex; +#endif + atomic_t dev_addr_genid; + atomic_t fib6_sernum; + struct seg6_pernet_data *seg6_data; + struct fib_notifier_ops *notifier_ops; + int flowlabel_count; + struct { + struct hlist_head head; + spinlock_t lock; + u32 seq; + } ip6addrlbl_table; + struct ioam6_pernet_data *ioam6_data; +}; + +#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) +struct netns_nf_frag { + struct fqdir *fqdir; +}; +#endif + +#endif -- cgit v1.3.1