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[71.218.113.86]) by smtp.gmail.com with ESMTPSA id q2-20020a056e020c2200b002d546bec2f6sm479474ilg.67.2022.06.06.06.28.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Jun 2022 06:28:10 -0700 (PDT) From: James Hilliard To: bpf@vger.kernel.org Cc: James Hilliard , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , netdev@vger.kernel.org (open list:BPF (Safe dynamic programs and tools)), linux-kernel@vger.kernel.org (open list) Subject: [PATCH 1/1] libbpf: fix broken gcc pragma macros in bpf_helpers.h/bpf_tracing.h Date: Mon, 6 Jun 2022 07:27:40 -0600 Message-Id: <20220606132741.3462925-1-james.hilliard1@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org It seems the gcc preprocessor breaks unless pragmas are wrapped individually inside macros. Fixes errors like: error: expected identifier or '(' before '#pragma' 106 | SEC("cgroup/bind6") | ^~~ error: expected '=', ',', ';', 'asm' or '__attribute__' before '#pragma' 114 | char _license[] SEC("license") = "GPL"; | ^~~ Signed-off-by: James Hilliard --- tools/lib/bpf/bpf_helpers.h | 26 ++++++++++++++------------ tools/lib/bpf/bpf_tracing.h | 26 ++++++++++++++------------ 2 files changed, 28 insertions(+), 24 deletions(-) diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h index fb04eaf367f1..6d159082727d 100644 --- a/tools/lib/bpf/bpf_helpers.h +++ b/tools/lib/bpf/bpf_helpers.h @@ -22,11 +22,13 @@ * To allow use of SEC() with externs (e.g., for extern .maps declarations), * make sure __attribute__((unused)) doesn't trigger compilation warning. */ +#define __gcc_helpers_pragma(x) _Pragma(#x) +#define __gcc_helpers_diag_pragma(x) __gcc_helpers_pragma("GCC diagnostic " #x) #define SEC(name) \ - _Pragma("GCC diagnostic push") \ - _Pragma("GCC diagnostic ignored \"-Wignored-attributes\"") \ + __gcc_helpers_diag_pragma(push) \ + __gcc_helpers_diag_pragma(ignored "-Wignored-attributes") \ __attribute__((section(name), used)) \ - _Pragma("GCC diagnostic pop") \ + __gcc_helpers_diag_pragma(pop) /* Avoid 'linux/stddef.h' definition of '__always_inline'. */ #undef __always_inline @@ -215,10 +217,10 @@ enum libbpf_tristate { static const char ___fmt[] = fmt; \ unsigned long long ___param[___bpf_narg(args)]; \ \ - _Pragma("GCC diagnostic push") \ - _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ + __gcc_helpers_diag_pragma(push) \ + __gcc_helpers_diag_pragma(ignored "-Wint-conversion") \ ___bpf_fill(___param, args); \ - _Pragma("GCC diagnostic pop") \ + __gcc_helpers_diag_pragma(pop) \ \ bpf_seq_printf(seq, ___fmt, sizeof(___fmt), \ ___param, sizeof(___param)); \ @@ -233,10 +235,10 @@ enum libbpf_tristate { static const char ___fmt[] = fmt; \ unsigned long long ___param[___bpf_narg(args)]; \ \ - _Pragma("GCC diagnostic push") \ - _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ + __gcc_helpers_diag_pragma(push) \ + __gcc_helpers_diag_pragma(ignored "-Wint-conversion") \ ___bpf_fill(___param, args); \ - _Pragma("GCC diagnostic pop") \ + __gcc_helpers_diag_pragma(pop) \ \ bpf_snprintf(out, out_size, ___fmt, \ ___param, sizeof(___param)); \ @@ -264,10 +266,10 @@ enum libbpf_tristate { static const char ___fmt[] = fmt; \ unsigned long long ___param[___bpf_narg(args)]; \ \ - _Pragma("GCC diagnostic push") \ - _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ + __gcc_helpers_diag_pragma(push) \ + __gcc_helpers_diag_pragma(ignored "-Wint-conversion") \ ___bpf_fill(___param, args); \ - _Pragma("GCC diagnostic pop") \ + __gcc_helpers_diag_pragma(pop) \ \ bpf_trace_vprintk(___fmt, sizeof(___fmt), \ ___param, sizeof(___param)); \ diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h index 01ce121c302d..e08ffc290b3e 100644 --- a/tools/lib/bpf/bpf_tracing.h +++ b/tools/lib/bpf/bpf_tracing.h @@ -422,16 +422,18 @@ struct pt_regs; * This is useful when using BPF helpers that expect original context * as one of the parameters (e.g., for bpf_perf_event_output()). */ +#define __gcc_tracing_pragma(x) _Pragma(#x) +#define __gcc_tracing_diag_pragma(x) __gcc_tracing_pragma("GCC diagnostic " #x) #define BPF_PROG(name, args...) \ name(unsigned long long *ctx); \ static __attribute__((always_inline)) typeof(name(0)) \ ____##name(unsigned long long *ctx, ##args); \ typeof(name(0)) name(unsigned long long *ctx) \ { \ - _Pragma("GCC diagnostic push") \ - _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ + __gcc_tracing_diag_pragma(push) \ + __gcc_tracing_diag_pragma(ignored "-Wint-conversion") \ return ____##name(___bpf_ctx_cast(args)); \ - _Pragma("GCC diagnostic pop") \ + __gcc_tracing_diag_pragma(pop) \ } \ static __attribute__((always_inline)) typeof(name(0)) \ ____##name(unsigned long long *ctx, ##args) @@ -462,10 +464,10 @@ static __attribute__((always_inline)) typeof(name(0)) \ ____##name(struct pt_regs *ctx, ##args); \ typeof(name(0)) name(struct pt_regs *ctx) \ { \ - _Pragma("GCC diagnostic push") \ - _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ + __gcc_tracing_diag_pragma(push) \ + __gcc_tracing_diag_pragma(ignored "-Wint-conversion") \ return ____##name(___bpf_kprobe_args(args)); \ - _Pragma("GCC diagnostic pop") \ + __gcc_tracing_diag_pragma(pop) \ } \ static __attribute__((always_inline)) typeof(name(0)) \ ____##name(struct pt_regs *ctx, ##args) @@ -486,10 +488,10 @@ static __attribute__((always_inline)) typeof(name(0)) \ ____##name(struct pt_regs *ctx, ##args); \ typeof(name(0)) name(struct pt_regs *ctx) \ { \ - _Pragma("GCC diagnostic push") \ - _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ + __gcc_tracing_diag_pragma(push) \ + __gcc_tracing_diag_pragma(ignored "-Wint-conversion") \ return ____##name(___bpf_kretprobe_args(args)); \ - _Pragma("GCC diagnostic pop") \ + __gcc_tracing_diag_pragma(pop) \ } \ static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args) @@ -520,10 +522,10 @@ ____##name(struct pt_regs *ctx, ##args); \ typeof(name(0)) name(struct pt_regs *ctx) \ { \ struct pt_regs *regs = PT_REGS_SYSCALL_REGS(ctx); \ - _Pragma("GCC diagnostic push") \ - _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ + __gcc_tracing_diag_pragma(push) \ + __gcc_tracing_diag_pragma(ignored "-Wint-conversion") \ return ____##name(___bpf_syscall_args(args)); \ - _Pragma("GCC diagnostic pop") \ + __gcc_tracing_diag_pragma(pop) \ } \ static __attribute__((always_inline)) typeof(name(0)) \ ____##name(struct pt_regs *ctx, ##args) -- 2.25.1