From: Nathan Chancellor <nathan@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Sasha Levin <sashal@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Nick Desaulniers <ndesaulniers@google.com>,
stable@vger.kernel.org, llvm@lists.linux.dev
Subject: static call fixes for clang's conditional tail calls (6.2 and 6.1)
Date: Tue, 21 Feb 2023 12:48:05 -0700 [thread overview]
Message-ID: <Y/Uf9WUi/rANmOk8@dev-arch.thelio-3990X> (raw)
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Hi Greg and Sasha,
Please consider applying the following commits to 6.2 (they apply
cleanly with some fuzz for me):
db7adcfd1cec ("x86/alternatives: Introduce int3_emulate_jcc()")
ac0ee0a9560c ("x86/alternatives: Teach text_poke_bp() to patch Jcc.d32 instructions")
923510c88d2b ("x86/static_call: Add support for Jcc tail-calls")
I have attached backports to 6.1.
Without these changes, kernels built with any version of clang using -Os
or clang 17.0.0 (tip of tree) at any kernel-supported optimization level
do not boot. This has been tested by people affected by this problem,
see https://github.com/ClangBuiltLinux/linux/issues/1774 for more info.
If there are any problems, please let me know.
Cheers,
Nathan
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next reply other threads:[~2023-02-21 19:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-21 19:48 Nathan Chancellor [this message]
2023-02-23 9:35 ` static call fixes for clang's conditional tail calls (6.2 and 6.1) Greg Kroah-Hartman
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