Merge branch 'bpf-avoid-attribute-ignored-warnings-in-gcc'

Jose E. Marchesi says:

====================
bpf: avoid `attribute ignored' warnings in GCC

These two patches avoid warnings (turned into errors) when building
the BPF selftests with GCC.

[Changes from V1:
- As requested by reviewer, an additional patch has been added in
  order to remove __hidden from the `private' macro in
  cpumask_common.h.
- Typo bening -> benign fixed in the commit message of the second
  patch.]
====================

Link: https://lore.kernel.org/r/20240507074227.4523-1-jose.marchesi@oracle.com
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

Author: anakryiko

tools/testing/selftests/bpf/Makefile

@@ -431,7 +431,7 @@ endef
 # Build BPF object using GCC
 define GCC_BPF_BUILD_RULE
 	$(call msg,GCC-BPF,$(TRUNNER_BINARY),$2)
-	$(Q)$(BPF_GCC) $3 -O2 -c $1 -o $2
+	$(Q)$(BPF_GCC) $3 -Wno-attributes -O2 -c $1 -o $2
 endef
 
 SKEL_BLACKLIST := btf__% test_pinning_invalid.c test_sk_assign.c

tools/testing/selftests/bpf/progs/cpumask_common.h

@@ -9,7 +9,7 @@
 
 int err;
 
-#define private(name) SEC(".bss." #name) __hidden __attribute__((aligned(8)))
+#define private(name) SEC(".bss." #name) __attribute__((aligned(8)))
 private(MASK) static struct bpf_cpumask __kptr * global_mask;
 
 struct __cpumask_map_value {