linux-kernel - [PATCH AUTOSEL 6.7 07/12] tools: selftests: riscv: Fix compile warnings in mm tests

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Date: Mon, 29 Jan 2024 13:34:16 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Christoph Müllner <christoph.muellner@...ll.eu>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Sasha Levin <sashal@...nel.org>,
	shuah@...nel.org,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	charlie@...osinc.com,
	linux-kselftest@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.7 07/12] tools: selftests: riscv: Fix compile warnings in mm tests

From: Christoph Müllner <christoph.muellner@...ll.eu>

[ Upstream commit 12c16919652b5873f524c8b361336ecfa5ce5e6b ]

When building the mm tests with a riscv32 compiler, we see a range
of shift-count-overflow errors from shifting 1UL by more than 32 bits
in do_mmaps(). Since, the relevant code is only called from code that
is gated by `__riscv_xlen == 64`, we can just apply the same gating
to do_mmaps().

Signed-off-by: Christoph Müllner <christoph.muellner@...ll.eu>
Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>
Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
Link: https://lore.kernel.org/r/20231123185821.2272504-6-christoph.muellner@vrull.eu
Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/riscv/mm/mmap_test.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/riscv/mm/mmap_test.h b/tools/testing/selftests/riscv/mm/mmap_test.h
index 9b8434f62f57..2e0db9c5be6c 100644
--- a/tools/testing/selftests/riscv/mm/mmap_test.h
+++ b/tools/testing/selftests/riscv/mm/mmap_test.h
@@ -18,6 +18,8 @@ struct addresses {
 	int *on_56_addr;
 };
 
+// Only works on 64 bit
+#if __riscv_xlen == 64
 static inline void do_mmaps(struct addresses *mmap_addresses)
 {
 	/*
@@ -50,6 +52,7 @@ static inline void do_mmaps(struct addresses *mmap_addresses)
 	mmap_addresses->on_56_addr =
 		mmap(on_56_bits, 5 * sizeof(int), prot, flags, 0, 0);
 }
+#endif /* __riscv_xlen == 64 */
 
 static inline int memory_layout(void)
 {
-- 
2.43.0