x86: Fix kthread unwind

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The rewrite of ret_from_form() misplaced an unwind hint which caused
all kthread stack unwinds to be marked unreliable, breaking
livepatching.

Restore the annotation and add a comment to explain the how and why of
things.

Fixes: 3aec4ecb3d ("x86: Rewrite ret_from_fork() in C")
Reported-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Petr Mladek <pmladek@suse.com>
Link: https://lkml.kernel.org/r/20230719201538.GA3553016@hirez.programming.kicks-ass.net

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This commit is contained in:

Peter Zijlstra 2023-07-19 22:15:38 +02:00

parent fdf0eaf114

commit 2e7e5bbb1c

1 changed files with 15 additions and 1 deletions

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arch/x86/entry/entry_64.S

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