kbuild: uapi: validate that headers do not use libc

The UAPI headers should be self-contained. That means they should not
use other headers from libc. Currently this is not enforced and various
dependencies have crept in.

Add a check to make sure no new ones are added.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Link: https://patch.msgid.link/20251223-uapi-nostdinc-v1-1-d91545d794f7@linutronix.de
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
This commit is contained in:
Thomas Weißschuh 2025-12-23 08:04:08 +01:00 committed by Nathan Chancellor
parent 76df6815da
commit 6059b880a9
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View file

@ -68,12 +68,89 @@ endif
# asm-generic/*.h is used by asm/*.h, and should not be included directly
no-header-test += asm-generic/%
# The following are using libc header and types.
#
# Do not add a new header to the list without legitimate reason.
# Please consider to fix the header first.
#
# Sorted alphabetically.
uses-libc += linux/a.out.h
uses-libc += linux/atmbr2684.h
uses-libc += linux/auto_dev-ioctl.h
uses-libc += linux/auto_fs.h
uses-libc += linux/auto_fs4.h
uses-libc += linux/btrfs_tree.h
uses-libc += linux/cec-funcs.h
uses-libc += linux/cec.h
uses-libc += linux/dvb/dmx.h
uses-libc += linux/dvb/video.h
uses-libc += linux/ethtool.h
uses-libc += linux/ethtool_netlink.h
uses-libc += linux/fuse.h
uses-libc += linux/gsmmux.h
uses-libc += linux/icmp.h
uses-libc += linux/idxd.h
uses-libc += linux/if.h
uses-libc += linux/if_arp.h
uses-libc += linux/if_bonding.h
uses-libc += linux/if_pppox.h
uses-libc += linux/if_tunnel.h
uses-libc += linux/input.h
uses-libc += linux/ip6_tunnel.h
uses-libc += linux/joystick.h
uses-libc += linux/llc.h
uses-libc += linux/mctp.h
uses-libc += linux/mdio.h
uses-libc += linux/mii.h
uses-libc += linux/mptcp.h
uses-libc += linux/netdevice.h
uses-libc += linux/netfilter/xt_RATEEST.h
uses-libc += linux/netfilter/xt_hashlimit.h
uses-libc += linux/netfilter/xt_physdev.h
uses-libc += linux/netfilter/xt_rateest.h
uses-libc += linux/netfilter_arp/arp_tables.h
uses-libc += linux/netfilter_arp/arpt_mangle.h
uses-libc += linux/netfilter_bridge.h
uses-libc += linux/netfilter_bridge/ebtables.h
uses-libc += linux/netfilter_ipv4.h
uses-libc += linux/netfilter_ipv4/ip_tables.h
uses-libc += linux/netfilter_ipv6.h
uses-libc += linux/netfilter_ipv6/ip6_tables.h
uses-libc += linux/route.h
uses-libc += linux/shm.h
uses-libc += linux/soundcard.h
uses-libc += linux/string.h
uses-libc += linux/tipc_config.h
uses-libc += linux/uhid.h
uses-libc += linux/uinput.h
uses-libc += linux/vhost.h
uses-libc += linux/vhost_types.h
uses-libc += linux/virtio_ring.h
uses-libc += linux/wireless.h
uses-libc += regulator/regulator.h
uses-libc += scsi/fc/fc_els.h
ifeq ($(SRCARCH),hexagon)
uses-libc += asm/sigcontext.h
endif
ifeq ($(SRCARCH),nios2)
uses-libc += asm/ptrace.h
uses-libc += linux/bpf_perf_event.h
endif
ifeq ($(SRCARCH),s390)
uses-libc += asm/chpid.h
uses-libc += asm/chsc.h
endif
always-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
# Include the header twice to detect missing include guard.
quiet_cmd_hdrtest = HDRTEST $<
cmd_hdrtest = \
$(CC) $(c_flags) -fsyntax-only -Werror -x c /dev/null \
$(if $(filter-out $(uses-libc), $*.h), -nostdinc) \
$(if $(filter-out $(no-header-test), $*.h), -include $< -include $<); \
$(PERL) $(src)/headers_check.pl $(obj) $<; \
touch $@