Revert "x86/orc: Make it callthunk aware"

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Commit 396e0b8e09 ("x86/orc: Make it callthunk aware") attempted to
deal with the fact that function prefix code didn't have ORC coverage.
However, it didn't work as advertised.  Use of the "null" ORC entry just
caused affected unwinds to end early.

The root cause has now been fixed with commit 5743654f5e ("objtool:
Generate ORC data for __pfx code").

Revert most of commit 396e0b8e09 ("x86/orc: Make it callthunk aware").
The is_callthunk() function remains as it's now used by other code.

Link: https://lore.kernel.org/r/a05b916ef941da872cbece1ab3593eceabd05a79.1684245404.git.jpoimboe@kernel.org
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>

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This commit is contained in:

Josh Poimboeuf 2023-05-16 06:56:46 -07:00

parent 4a03aa3443

commit 020126239b

3 changed files with 2 additions and 26 deletions

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5

arch/x86/include/asm/alternative.h

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2

arch/x86/kernel/callthunks.c

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21

arch/x86/kernel/unwind_orc.c

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