linux-kernel - [PATCH] tools/perf: Fix compiling with libelf on rv32

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Message-Id: <20240415095532.4930-1-cp0613@linux.alibaba.com>
Date: Mon, 15 Apr 2024 17:55:32 +0800
From: cp0613@...ux.alibaba.com
To: palmer@...belt.com,
	paul.walmsley@...ive.com,
	aou@...s.berkeley.edu
Cc: linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	Chen Pei <cp0613@...ux.alibaba.com>
Subject: [PATCH] tools/perf: Fix compiling with libelf on rv32

From: Chen Pei <cp0613@...ux.alibaba.com>

When cross-compiling perf with libelf, the following error occurred:

	In file included from tests/genelf.c:14:
	tests/../util/genelf.h:50:2: error: #error "unsupported architecture"
	50 | #error "unsupported architecture"
		|  ^~~~~
	tests/../util/genelf.h:59:5: warning: "GEN_ELF_CLASS" is not defined, evaluates to 0 [-Wundef]
	59 | #if GEN_ELF_CLASS == ELFCLASS64

Fix this by adding GEN-ELF-ARCH and GEN-ELF-CLASS definitions for rv32.

Signed-off-by: Chen Pei <cp0613@...ux.alibaba.com>
---
 tools/perf/util/genelf.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/genelf.h b/tools/perf/util/genelf.h
index 5f18d20ea903..4e2e4f40e134 100644
--- a/tools/perf/util/genelf.h
+++ b/tools/perf/util/genelf.h
@@ -43,6 +43,9 @@ int jit_add_debug_info(Elf *e, uint64_t code_addr, void *debug, int nr_debug_ent
 #elif defined(__riscv) && __riscv_xlen == 64
 #define GEN_ELF_ARCH	EM_RISCV
 #define GEN_ELF_CLASS	ELFCLASS64
+#elif defined(__riscv) && __riscv_xlen == 32
+#define GEN_ELF_ARCH	EM_RISCV
+#define GEN_ELF_CLASS	ELFCLASS32
 #elif defined(__loongarch__)
 #define GEN_ELF_ARCH	EM_LOONGARCH
 #define GEN_ELF_CLASS	ELFCLASS64
-- 
2.25.1