[PATCH 1/2] riscv: vdso_cfi: Add clean rule for copied sources

[cp0613@linux.alibaba.com]

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

When building VDSO with CFI support, source files are copied from the main
VDSO directory to the CFI build directory as part of the build process.
However, these copied source files were not removed during 'make clean',
leaving temporary files in the build directory.

Add the clean-files variable to ensure that these copied .c and .S files
are properly cleaned up. The notdir() function is used to strip the path
prefix, as clean-files expects relative file names without directory
components.

This ensures the build directory is left in a clean state after make clean.

Signed-off-by: Chen Pei <cp0613@linux.alibaba.com>
---
 arch/riscv/kernel/vdso_cfi/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/kernel/vdso_cfi/Makefile b/arch/riscv/kernel/vdso_cfi/Makefile
index 8ebd190782b0..10292498b765 100644
--- a/arch/riscv/kernel/vdso_cfi/Makefile
+++ b/arch/riscv/kernel/vdso_cfi/Makefile
@@ -23,3 +23,6 @@ $(vdso_c_objects): $(obj)/%.c: $(src)/%.c
 # Include the main VDSO Makefile which contains all the build rules and sources
 # The VDSO_CFI_BUILD variable will be passed to it to enable CFI compilation
 include $(src)/Makefile
+
+# Clean rules - remove the copied source files
+clean-files += $(notdir $(vdso_c_sources)) $(notdir $(vdso_S_sources))
-- 
2.50.1