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Subject[PATCH v4 0/9] kentry: A stable bugfix and a bunch of improvements
Date
I noticed a little bug in fast compat syscalls.  I got a bit carried away
fixing it. This renames the irqentry stuff to kentry, improves (IMNSHO)
the API, and adds lots of debugging.

It also tweaks the unwinder wrt ret_from_fork and rewrites ret_from_fork
in C. I did this because the kentry work involved a small change to
ret_from_fork, and adjusting the asm is a mess. So C it is.

Changes from v3: Get rid of arm64 special cases

Changes from v1 and v2: Complete rewrite

Andy Lutomirski (9):
x86/dumpstack: Remove unnecessary range check fetching opcode bytes
x86/kthread,dumpstack: Set task_pt_regs->cs.RPL=3 for kernel threads
x86/entry: Convert ret_from_fork to C
kentry: Simplify the common syscall API
kentry: Remove enter_from/exit_to_user_mode()
entry: Make CONFIG_DEBUG_ENTRY available outside x86
kentry: Add debugging checks for proper kentry API usage
kentry: Check that syscall entries and syscall exits match
kentry: Verify kentry state in instrumentation_begin/end()

arch/x86/Kconfig.debug | 10 --
arch/x86/entry/common.c | 78 ++++++++++----
arch/x86/entry/entry_32.S | 51 ++-------
arch/x86/entry/entry_64.S | 33 ++----
arch/x86/include/asm/switch_to.h | 2 +-
arch/x86/kernel/dumpstack.c | 10 +-
arch/x86/kernel/process.c | 15 ++-
arch/x86/kernel/process_32.c | 2 +-
arch/x86/kernel/traps.c | 4 +-
arch/x86/kernel/unwind_orc.c | 2 +-
include/asm-generic/bug.h | 8 +-
include/linux/entry-common.h | 127 +++--------------------
include/linux/instrumentation.h | 25 ++++-
include/linux/sched.h | 4 +
init/init_task.c | 8 ++
kernel/entry/common.c | 173 ++++++++++++++++++++-----------
lib/Kconfig.debug | 11 ++
17 files changed, 267 insertions(+), 296 deletions(-)

--
2.30.2

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