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The compiler splits unlikely code into a separate foo.cold symbol. Both
halves are the same function and both belong in the livepatch: carrying
only the hot part leaves the cold path branching into unpatched code.
GCC needs -freorder-blocks-and-partition to split reliably. The flag is
probed rather than assumed, and the test skips when the compiler declines
to split at all.
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Assisted-by: Claude:claude-opus-5
Link: https://patch.msgid.link/20260916184351.2720310-17-song@kernel.org
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