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From: "tip-bot2 for Nathan Chancellor" <tip-bot2@linutronix.de>
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Reply-to: linux-kernel@vger.kernel.org
To: linux-tip-commits@vger.kernel.org
Subject: [tip: x86/urgent] x86/vdso: Conditionally export
__vdso_sgx_enter_enclave()
Cc: Nathan Chancellor <nathan@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Nick Desaulniers <ndesaulniers@google.com>, x86@kernel.org,
linux-kernel@vger.kernel.org
In-Reply-To: <20221109000306.1407357-1-nathan@kernel.org>
References: <20221109000306.1407357-1-nathan@kernel.org>
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[tip:,x86/urgent] x86/vdso: Conditionally export __vdso_sgx_enter_enclave()
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Commit Message
tip-bot2 for Thomas Gleixner
Dec. 9, 2022, 2:02 p.m. UTC
The following commit has been merged into the x86/urgent branch of tip:
Commit-ID: 45be2ad007a9c6bea70249c4cf3e4905afe4caeb
Gitweb: https://git.kernel.org/tip/45be2ad007a9c6bea70249c4cf3e4905afe4caeb
Author: Nathan Chancellor <nathan@kernel.org>
AuthorDate: Tue, 08 Nov 2022 17:03:07 -07:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Fri, 09 Dec 2022 14:58:02 +01:00
x86/vdso: Conditionally export __vdso_sgx_enter_enclave()
Recently, ld.lld moved from '--undefined-version' to
'--no-undefined-version' as the default, which breaks building the vDSO
when CONFIG_X86_SGX is not set:
ld.lld: error: version script assignment of 'LINUX_2.6' to symbol '__vdso_sgx_enter_enclave' failed: symbol not defined
__vdso_sgx_enter_enclave is only included in the vDSO when
CONFIG_X86_SGX is set. Only export it if it will be present in the final
object, which clears up the error.
Fixes: 8466436952017 ("x86/vdso: Implement a vDSO for Intel SGX enclave call")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1756
Link: https://lore.kernel.org/r/20221109000306.1407357-1-nathan@kernel.org
---
arch/x86/entry/vdso/vdso.lds.S | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/entry/vdso/vdso.lds.S b/arch/x86/entry/vdso/vdso.lds.S index 4bf4846..e8c60ae 100644 --- a/arch/x86/entry/vdso/vdso.lds.S +++ b/arch/x86/entry/vdso/vdso.lds.S @@ -27,7 +27,9 @@ VERSION { __vdso_time; clock_getres; __vdso_clock_getres; +#ifdef CONFIG_X86_SGX __vdso_sgx_enter_enclave; +#endif local: *; }; }