RISC-V: vdso: Do not add missing symbols to version section in linker script
authorNathan Chancellor <nathan@kernel.org>
Tue, 8 Nov 2022 17:13:23 +0000 (10:13 -0700)
committerPalmer Dabbelt <palmer@rivosinc.com>
Thu, 10 Nov 2022 23:06:14 +0000 (15:06 -0800)
commitfcae44fd36d052e956e69a64642fc03820968d78
tree69c25b525a4d67fae182c8478a4def7bc9e76db2
parent50e63dd8ed92045eb70a72d7ec725488320fb68b
RISC-V: vdso: Do not add missing symbols to version section in linker script

Recently, ld.lld moved from '--undefined-version' to
'--no-undefined-version' as the default, which breaks the compat vDSO
build:

  ld.lld: error: version script assignment of 'LINUX_4.15' to symbol '__vdso_gettimeofday' failed: symbol not defined
  ld.lld: error: version script assignment of 'LINUX_4.15' to symbol '__vdso_clock_gettime' failed: symbol not defined
  ld.lld: error: version script assignment of 'LINUX_4.15' to symbol '__vdso_clock_getres' failed: symbol not defined

These symbols are not present in the compat vDSO or the regular vDSO for
32-bit but they are unconditionally included in the version section of
the linker script, which is prohibited with '--no-undefined-version'.

Fix this issue by only including the symbols that are actually exported
in the version section of the linker script.

Link: https://github.com/ClangBuiltLinux/linux/issues/1756
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20221108171324.3377226-1-nathan@kernel.org/
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
arch/riscv/kernel/vdso/Makefile
arch/riscv/kernel/vdso/vdso.lds.S