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 v1 and v2: Complete rewrite Andy Lutomirski (11): x86/entry: Fix entry/exit mismatch on failed fast 32-bit syscalls kentry: Rename irqentry to kentry 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: Make entry/exit_to_user_mode() arm64-only 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 | 85 ++++++++++---- arch/x86/entry/entry_32.S | 51 ++------ arch/x86/entry/entry_64.S | 33 ++---- arch/x86/include/asm/idtentry.h | 28 ++--- arch/x86/include/asm/switch_to.h | 2 +- arch/x86/kernel/cpu/mce/core.c | 10 +- arch/x86/kernel/dumpstack.c | 10 +- arch/x86/kernel/kvm.c | 6 +- arch/x86/kernel/nmi.c | 6 +- arch/x86/kernel/process.c | 15 ++- arch/x86/kernel/process_32.c | 2 +- arch/x86/kernel/traps.c | 32 ++--- arch/x86/kernel/unwind_orc.c | 2 +- arch/x86/mm/fault.c | 6 +- include/asm-generic/bug.h | 8 +- include/linux/entry-common.h | 180 ++++++++-------------------- include/linux/instrumentation.h | 25 +++- include/linux/sched.h | 4 + init/init_task.c | 8 ++ kernel/entry/common.c | 193 +++++++++++++++++++++---------- lib/Kconfig.debug | 11 ++ 22 files changed, 366 insertions(+), 361 deletions(-) -- 2.29.2
