[jolsa-perf:bpf/optimized_usdt_3 21/24] kernel/events/uprobes.c:2522:undefined reference to `arch_uprobe_optimize'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/optimized_usdt_3
head:   2e0575143d13814d04f02a33a4110989ccdbf3a3
commit: 0200936b03cfee067eb7db4b44079104b561b726 [21/24] uprobes/x86: Add support to optimize uprobes
config: powerpc-randconfig-003-20241103 (https://download.01.org/0day-ci/archive/20241103/202411031222.d41XHGa9-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241103/202411031222.d41XHGa9-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411031222.d41XHGa9-lkp@intel.com/

All errors (new ones prefixed by >>):

   powerpc-linux-ld: kernel/events/uprobes.o: in function `handle_swbp':
>> kernel/events/uprobes.c:2522:(.text+0x76f8): undefined reference to `arch_uprobe_optimize'

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for GET_FREE_REGION
   Depends on [n]: SPARSEMEM [=n]
   Selected by [y]:
   - RESOURCE_KUNIT_TEST [=y] && RUNTIME_TESTING_MENU [=y] && KUNIT [=y]


vim +2522 kernel/events/uprobes.c

  2457	
  2458	/*
  2459	 * Run handler and ask thread to singlestep.
  2460	 * Ensure all non-fatal signals cannot interrupt thread while it singlesteps.
  2461	 */
  2462	static void handle_swbp(struct pt_regs *regs)
  2463	{
  2464		struct uprobe *uprobe;
  2465		unsigned long bp_vaddr;
  2466		int is_swbp;
  2467	
  2468		bp_vaddr = uprobe_get_swbp_addr(regs);
  2469		if (bp_vaddr == uprobe_get_trampoline_vaddr())
  2470			return uprobe_handle_trampoline(regs);
  2471	
  2472		rcu_read_lock_trace();
  2473	
  2474		uprobe = find_active_uprobe_rcu(bp_vaddr, &is_swbp);
  2475		if (!uprobe) {
  2476			if (is_swbp > 0) {
  2477				/* No matching uprobe; signal SIGTRAP. */
  2478				force_sig(SIGTRAP);
  2479			} else {
  2480				/*
  2481				 * Either we raced with uprobe_unregister() or we can't
  2482				 * access this memory. The latter is only possible if
  2483				 * another thread plays with our ->mm. In both cases
  2484				 * we can simply restart. If this vma was unmapped we
  2485				 * can pretend this insn was not executed yet and get
  2486				 * the (correct) SIGSEGV after restart.
  2487				 */
  2488				instruction_pointer_set(regs, bp_vaddr);
  2489			}
  2490			goto out;
  2491		}
  2492	
  2493		/* change it in advance for ->handler() and restart */
  2494		instruction_pointer_set(regs, bp_vaddr);
  2495	
  2496		/*
  2497		 * TODO: move copy_insn/etc into _register and remove this hack.
  2498		 * After we hit the bp, _unregister + _register can install the
  2499		 * new and not-yet-analyzed uprobe at the same address, restart.
  2500		 */
  2501		if (unlikely(!test_bit(UPROBE_COPY_INSN, &uprobe->flags)))
  2502			goto out;
  2503	
  2504		/*
  2505		 * Pairs with the smp_wmb() in prepare_uprobe().
  2506		 *
  2507		 * Guarantees that if we see the UPROBE_COPY_INSN bit set, then
  2508		 * we must also see the stores to &uprobe->arch performed by the
  2509		 * prepare_uprobe() call.
  2510		 */
  2511		smp_rmb();
  2512	
  2513		/* Tracing handlers use ->utask to communicate with fetch methods */
  2514		if (!get_utask())
  2515			goto out;
  2516	
  2517		if (arch_uprobe_ignore(&uprobe->arch, regs))
  2518			goto out;
  2519	
  2520		handler_chain(uprobe, regs);
  2521	
> 2522		arch_uprobe_optimize(&uprobe->arch, bp_vaddr);
  2523	
  2524		if (arch_uprobe_skip_sstep(&uprobe->arch, regs))
  2525			goto out;
  2526	
  2527		if (pre_ssout(uprobe, regs, bp_vaddr))
  2528			goto out;
  2529	
  2530	out:
  2531		/* arch_uprobe_skip_sstep() succeeded, or restart if can't singlestep */
  2532		rcu_read_unlock_trace();
  2533	}
  2534	

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