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From: Nathan Chancellor <nathan@kernel.org>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Conor Dooley <conor@kernel.org>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	llvm@lists.linux.dev, patches@lists.linux.dev,
	Nathan Chancellor <nathan@kernel.org>
Subject: [PATCH] RISC-V: vdso: Do not add missing symbols to version section in linker script
Date: Tue,  8 Nov 2022 10:13:23 -0700	[thread overview]
Message-ID: <20221108171324.3377226-1-nathan@kernel.org> (raw)

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>
---
 arch/riscv/kernel/vdso/Makefile   | 3 +++
 arch/riscv/kernel/vdso/vdso.lds.S | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
index f2e065671e4d..82416ebf4cca 100644
--- a/arch/riscv/kernel/vdso/Makefile
+++ b/arch/riscv/kernel/vdso/Makefile
@@ -28,6 +28,9 @@ obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
 
 obj-y += vdso.o
 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
+ifneq ($(filter vgettimeofday, $(vdso-syms)),)
+CPPFLAGS_vdso.lds += -DHAS_VGETTIMEOFDAY
+endif
 
 # Disable -pg to prevent insert call site
 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os
diff --git a/arch/riscv/kernel/vdso/vdso.lds.S b/arch/riscv/kernel/vdso/vdso.lds.S
index 01d94aae5bf5..150b1a572e61 100644
--- a/arch/riscv/kernel/vdso/vdso.lds.S
+++ b/arch/riscv/kernel/vdso/vdso.lds.S
@@ -68,9 +68,11 @@ VERSION
 	LINUX_4.15 {
 	global:
 		__vdso_rt_sigreturn;
+#ifdef HAS_VGETTIMEOFDAY
 		__vdso_gettimeofday;
 		__vdso_clock_gettime;
 		__vdso_clock_getres;
+#endif
 		__vdso_getcpu;
 		__vdso_flush_icache;
 	local: *;

base-commit: f0c4d9fc9cc9462659728d168387191387e903cc
-- 
2.38.1


WARNING: multiple messages have this Message-ID (diff)
From: Nathan Chancellor <nathan@kernel.org>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Conor Dooley <conor@kernel.org>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	llvm@lists.linux.dev, patches@lists.linux.dev,
	Nathan Chancellor <nathan@kernel.org>
Subject: [PATCH] RISC-V: vdso: Do not add missing symbols to version section in linker script
Date: Tue,  8 Nov 2022 10:13:23 -0700	[thread overview]
Message-ID: <20221108171324.3377226-1-nathan@kernel.org> (raw)

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>
---
 arch/riscv/kernel/vdso/Makefile   | 3 +++
 arch/riscv/kernel/vdso/vdso.lds.S | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
index f2e065671e4d..82416ebf4cca 100644
--- a/arch/riscv/kernel/vdso/Makefile
+++ b/arch/riscv/kernel/vdso/Makefile
@@ -28,6 +28,9 @@ obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
 
 obj-y += vdso.o
 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
+ifneq ($(filter vgettimeofday, $(vdso-syms)),)
+CPPFLAGS_vdso.lds += -DHAS_VGETTIMEOFDAY
+endif
 
 # Disable -pg to prevent insert call site
 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os
diff --git a/arch/riscv/kernel/vdso/vdso.lds.S b/arch/riscv/kernel/vdso/vdso.lds.S
index 01d94aae5bf5..150b1a572e61 100644
--- a/arch/riscv/kernel/vdso/vdso.lds.S
+++ b/arch/riscv/kernel/vdso/vdso.lds.S
@@ -68,9 +68,11 @@ VERSION
 	LINUX_4.15 {
 	global:
 		__vdso_rt_sigreturn;
+#ifdef HAS_VGETTIMEOFDAY
 		__vdso_gettimeofday;
 		__vdso_clock_gettime;
 		__vdso_clock_getres;
+#endif
 		__vdso_getcpu;
 		__vdso_flush_icache;
 	local: *;

base-commit: f0c4d9fc9cc9462659728d168387191387e903cc
-- 
2.38.1


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             reply	other threads:[~2022-11-08 17:13 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-08 17:13 Nathan Chancellor [this message]
2022-11-08 17:13 ` [PATCH] RISC-V: vdso: Do not add missing symbols to version section in linker script Nathan Chancellor
2022-11-09  0:02 ` Conor Dooley
2022-11-09  0:02   ` Conor Dooley
2022-11-10 23:17 ` Palmer Dabbelt
2022-11-10 23:17   ` Palmer Dabbelt

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