From: Ben Dooks ben.dooks@sifive.com
[ Upstream commit a2a5580fcbf808e7c2310e4959b62f9d2157fdb6 ]
When checking with sparse, btf_show_type_value() is causing a warning about checking integer vs NULL when the macro is passed a pointer, due to the 'value != 0' check. Stop sparse complaining about any type-casting by adding a cast to the typeof(value).
This fixes the following sparse warnings:
kernel/bpf/btf.c:2579:17: warning: Using plain integer as NULL pointer kernel/bpf/btf.c:2581:17: warning: Using plain integer as NULL pointer kernel/bpf/btf.c:3407:17: warning: Using plain integer as NULL pointer kernel/bpf/btf.c:3758:9: warning: Using plain integer as NULL pointer
Signed-off-by: Ben Dooks ben.dooks@sifive.com Signed-off-by: Andrii Nakryiko andrii@kernel.org Acked-by: Yonghong Song yhs@fb.com Link: https://lore.kernel.org/bpf/20220714100322.260467-1-ben.dooks@sifive.com Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/bpf/btf.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 3cfba41a0829..cf89c99d4f28 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -1013,7 +1013,8 @@ __printf(2, 3) static void btf_show(struct btf_show *show, const char *fmt, ...) */ #define btf_show_type_value(show, fmt, value) \ do { \ - if ((value) != 0 || (show->flags & BTF_SHOW_ZERO) || \ + if ((value) != (__typeof__(value))0 || \ + (show->flags & BTF_SHOW_ZERO) || \ show->state.depth == 0) { \ btf_show(show, "%s%s" fmt "%s%s", \ btf_show_indent(show), \