[PATCH 0/2] x86: Rewrite ret_from_fork() in C

Brian Gerst
2023-06-22T12:08:15Z

When kCFI is enabled, special handling is needed for the indirect call
to the kernel thread function. Handling this in pure assembly is not
simple, so moving it to C is more appropriate. Instead of moving just
the indirect call to C as Peter Zijlstra has proposed, this patchset
rewrites the whole ret_from_fork() function in C (other than some
necessary asm glue remaning).

Brian Gerst (2):
x86/32: Remove schedule_tail_wrapper()
x86: Rewrite ret_from_fork() in C

arch/x86/entry/entry_32.S | 54 ++++++++------------------------
arch/x86/entry/entry_64.S | 35 ++++++---------------
arch/x86/include/asm/switch_to.h | 4 ++-
arch/x86/kernel/process.c | 22 ++++++++++++-
4 files changed, 47 insertions(+), 68 deletions(-)

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2.41.0