[PATCH 2/3] tracing: add more symbols to whitelist

[Arnd Bergmann <arnd@kernel.org>]

From: Arnd Bergmann <arnd@arndb.de>

Randconfig builds show a number of cryptic build errors from
hitting undefined symbols in simple_ring_buffer.o:

make[7]: *** [/home/arnd/arm-soc/kernel/trace/Makefile:147: kernel/trace/simple_ring_buffer.o.checked] Error 1

These happen with CONFIG_TRACE_BRANCH_PROFILING, CONFIG_KASAN_HW_TAGS,
CONFIG_STACKPROTECTOR, CONFIG_DEBUG_IRQFLAGS and indirectly from WARN_ON().

Add exceptions for each one that I have hit so far on arm64, x86_64 and arm
randconfig builds.

Other architectures likely hit additional ones, so it would be nice
to produce a little more verbose output that include the name of the
missing symbols directly.

Fixes: a717943d8ecc ("tracing: Check for undefined symbols in simple_ring_buffer")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 kernel/trace/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 3182e1bc1cf7..e3f8d6e619d2 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -138,6 +138,8 @@ obj-$(CONFIG_TRACE_REMOTE_TEST) += remote_test.o
 #
 UNDEFINED_ALLOWLIST := memset alt_cb_patch_nops __x86 __ubsan __asan __kasan __gcov __aeabi_unwind
 UNDEFINED_ALLOWLIST += __stack_chk_fail stackleak_track_stack __ref_stack __sanitizer
+UNDEFINED_ALLOWLIST += ftrace_likely_update __hwasan_load __hwasan_store __hwasan_tag_memory
+UNDEFINED_ALLOWLIST += warn_bogus_irq_restore warn_slowpath_fmt __stack_chk_guard
 UNDEFINED_ALLOWLIST := $(addprefix -e , $(UNDEFINED_ALLOWLIST))
 
 quiet_cmd_check_undefined = NM      $<
-- 
2.39.5