From: Jiakai Xu Date: Fri, 26 Dec 2025 03:23:17 +0000 (+0000) Subject: riscv: fix KUnit test_kprobes crash when building with Clang X-Git-Tag: v6.19-rc5~8^2~7 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=641ecc890038f08af160bdff5183b6b42d2313b5;p=thirdparty%2Fkernel%2Flinux.git riscv: fix KUnit test_kprobes crash when building with Clang Clang misinterprets the placement of test_kprobes_addresses and test_kprobes_functions arrays when they are not explicitly assigned to a data section. This can lead to kmalloc_array() allocation errors and KUnit failures. When testing the Clang-compiled code in QEMU, this warning was emitted: WARNING: CPU: 1 PID: 3000 at mm/page_alloc.c:5159 __alloc_frozen_pages_noprof+0xe6/0x2fc mm/page_alloc.c:5159 Further investigation revealed that the test_kprobes_addresses array appeared to have over 100,000 elements, including invalid addresses; whereas, according to test-kprobes-asm.S, test_kprobes_addresses should only have 25 elements. When compiling the kernel with GCC, the kernel boots correctly. This patch fixes the issue by adding .section .rodata to explicitly place arrays in the read-only data segment. For detailed debug and analysis, see: https://github.com/j1akai/temp/blob/main/20251113/readme.md v1 -> v2： - Drop changes to .align, and .globl. Signed-off-by: Jiakai Xu Signed-off-by: Jiakai Xu Link: https://patch.msgid.link/738dd4e2.ff73.19a7cd7b4d5.Coremail.xujiakai2025@iscas.ac.cn Link: https://github.com/llvm/llvm-project/issues/168308 Link: https://patch.msgid.link/20251226032317.1523764-1-jiakaiPeanut@gmail.com Signed-off-by: Paul Walmsley --- diff --git a/arch/riscv/kernel/tests/kprobes/test-kprobes-asm.S b/arch/riscv/kernel/tests/kprobes/test-kprobes-asm.S index b951d0f12482..f16deee9e091 100644 --- a/arch/riscv/kernel/tests/kprobes/test-kprobes-asm.S +++ b/arch/riscv/kernel/tests/kprobes/test-kprobes-asm.S @@ -181,6 +181,7 @@ SYM_FUNC_END(test_kprobes_c_bnez) #endif /* CONFIG_RISCV_ISA_C */ +.section .rodata SYM_DATA_START(test_kprobes_addresses) RISCV_PTR test_kprobes_add_addr1 RISCV_PTR test_kprobes_add_addr2 @@ -212,6 +213,7 @@ SYM_DATA_START(test_kprobes_addresses) RISCV_PTR 0 SYM_DATA_END(test_kprobes_addresses) +.section .rodata SYM_DATA_START(test_kprobes_functions) RISCV_PTR test_kprobes_add RISCV_PTR test_kprobes_jal