jetson-nano legacy: try, and fail, to fix this legacy; (does NOT) fixes #5117

- `jetson-nano` `legacy`: kernel config: `CONFIG_SECTION_MISMATCH_WARN_ONLY=y`
- `jetson-nano` `legacy`: add `-mno-outline-atomics` to fix linking
- `jetson-nano` `legacy`: add `xxd` host-dependency
- `jetson-nano` `legacy`: downgrade _a lot_ of gcc errors to allow this legacy to build

config/kernel/linux-jetson-nano-legacy.config

@@ -229,6 +229,7 @@ CONFIG_JUMP_LABEL=y
 # CONFIG_UPROBES is not set
 # CONFIG_HAVE_64BIT_ALIGNED_ACCESS is not set
 CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y
+CONFIG_KRETPROBES=y
 CONFIG_HAVE_KPROBES=y
 CONFIG_HAVE_KRETPROBES=y
 CONFIG_HAVE_ARCH_TRACEHOOK=y
@@ -716,8 +717,6 @@ CONFIG_XFRM_IPCOMP=m
 CONFIG_NET_KEY=y
 CONFIG_NET_KEY_MIGRATE=y
 CONFIG_INET=y
-CONFIG_WIREGUARD=m
-# CONFIG_WIREGUARD_DEBUG is not set
 CONFIG_IP_MULTICAST=y
 CONFIG_IP_ADVANCED_ROUTER=y
 CONFIG_IP_FIB_TRIE_STATS=y
@@ -1332,6 +1331,7 @@ CONFIG_NET_FLOW_LIMIT=y
 # Network testing
 #
 # CONFIG_NET_PKTGEN is not set
+# CONFIG_NET_TCPPROBE is not set
 # CONFIG_NET_DROP_MONITOR is not set
 # CONFIG_HAMRADIO is not set
 CONFIG_CAN=m
@@ -2664,6 +2664,13 @@ CONFIG_WLCORE=m
 # CONFIG_WLCORE_SPI is not set
 CONFIG_WLCORE_SDIO=m
 CONFIG_WILINK_PLATFORM_DATA=y
+# CONFIG_RTL8822BS is not set
+# CONFIG_RTL8188EU is not set
+CONFIG_RTL8821CU=m
+# CONFIG_88XXAU is not set
+# CONFIG_RTL8192EU is not set
+# CONFIG_RTL8189FS is not set
+# CONFIG_RTL8189ES is not set
 CONFIG_WLAN_VENDOR_ZYDAS=y
 CONFIG_USB_ZD1201=m
 CONFIG_ZD1211RW=m
@@ -2675,7 +2682,6 @@ CONFIG_USB_NET_RNDIS_WLAN=m
 # CONFIG_RTL8812AU is not set
 CONFIG_RTL8814AU=m
 CONFIG_RTL8821AU=m
-CONFIG_RTL8821CU=m
 CONFIG_RTL8822BU=m
 CONFIG_RTL8822CE=m
 
@@ -6573,7 +6579,7 @@ CONFIG_FRAME_WARN=2048
 CONFIG_DEBUG_FS=y
 # CONFIG_HEADERS_CHECK is not set
 CONFIG_DEBUG_SECTION_MISMATCH=y
-# CONFIG_SECTION_MISMATCH_WARN_ONLY is not set
+CONFIG_SECTION_MISMATCH_WARN_ONLY=y
 CONFIG_ARCH_WANT_FRAME_POINTERS=y
 CONFIG_FRAME_POINTER=y
 # CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set
@@ -6712,7 +6718,8 @@ CONFIG_BRANCH_PROFILE_NONE=y
 # CONFIG_PROFILE_ALL_BRANCHES is not set
 # CONFIG_STACK_TRACER is not set
 # CONFIG_BLK_DEV_IO_TRACE is not set
-# CONFIG_PROBE_EVENTS is not set
+CONFIG_KPROBE_EVENT=y
+CONFIG_PROBE_EVENTS=y
 CONFIG_DYNAMIC_FTRACE=y
 # CONFIG_FUNCTION_PROFILER is not set
 CONFIG_FTRACE_MCOUNT_RECORD=y
@@ -6728,6 +6735,7 @@ CONFIG_TRACING_EVENTS_GPIO=y
 #
 # CONFIG_LKDTM is not set
 # CONFIG_TEST_LIST_SORT is not set
+# CONFIG_KPROBES_SANITY_TEST is not set
 # CONFIG_BACKTRACE_SELF_TEST is not set
 # CONFIG_RBTREE_TEST is not set
 # CONFIG_INTERVAL_TREE_TEST is not set

config/sources/families/media.conf

@@ -46,6 +46,15 @@ case $BRANCH in
 			EXTRAWIFI="no"
 			WIREGUARD="no"
 		elif [[ $BOARD == jetson-nano ]]; then
+			# This is a very old kernel source that generates errors on modern gcc. Downgrade those to warnings.
+			declare -g KERNEL_EXTRA_CFLAGS="-Wno-error=builtin-declaration-mismatch -Wno-error=array-bounds -Wno-error=maybe-uninitialized -Wno-error=zero-length-bounds -Wno-error=restrict -Wno-error=stringop-overflow -Wno-error=array-parameter -mno-outline-atomics"
+
+			# This legacy thing requires `xxd` package installed. Don't ask questions.
+			function add_host_dependencies__jetson_nano_legacy_requires_xxd() {
+				display_alert "Adding xxd dep" "for ${BOARD} ${BRANCH}" "info"
+				declare -g EXTRA_BUILD_DEPS="${EXTRA_BUILD_DEPS} xxd"
+			}
+
 			KERNELDIR='linux-nano'
 			KERNELSOURCE='https://github.com/150balbes/Jetson-Nano'
 			declare -g KERNEL_MAJOR_MINOR="4.9" # Major and minor versions of this kernel.