Re: [PATCH v3 4/4] arc: Use generic dump_stack_print_cmdline() implementation

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On 8/8/22 06:09, Helge Deller wrote:
The process program name and command line is now shown in generic code
in dump_stack_print_info(), so drop the arc-specific implementation.

Signed-off-by: Helge Deller <deller@xxxxxx>

But that info printing was added back in 2018 by e36df28f532f882.
I don't think arc is using show_regs_print_info -> dump_stack_print_info yet.
Or is there a different code path now which calls here ?

---
  arch/arc/kernel/troubleshoot.c | 24 ------------------------
  1 file changed, 24 deletions(-)

diff --git a/arch/arc/kernel/troubleshoot.c b/arch/arc/kernel/troubleshoot.c
index 7654c2e42dc0..9807e590ee55 100644
--- a/arch/arc/kernel/troubleshoot.c
+++ b/arch/arc/kernel/troubleshoot.c
@@ -51,29 +51,6 @@ static void print_regs_callee(struct callee_regs *regs)
  		regs->r24, regs->r25);
  }

-static void print_task_path_n_nm(struct task_struct *tsk)
-{
-	char *path_nm = NULL;
-	struct mm_struct *mm;
-	struct file *exe_file;
-	char buf[ARC_PATH_MAX];
-
-	mm = get_task_mm(tsk);
-	if (!mm)
-		goto done;
-
-	exe_file = get_mm_exe_file(mm);
-	mmput(mm);
-
-	if (exe_file) {
-		path_nm = file_path(exe_file, buf, ARC_PATH_MAX-1);
-		fput(exe_file);
-	}
-
-done:
-	pr_info("Path: %s\n", !IS_ERR(path_nm) ? path_nm : "?");
-}
-
  static void show_faulting_vma(unsigned long address)
  {
  	struct vm_area_struct *vma;
@@ -176,7 +153,6 @@ void show_regs(struct pt_regs *regs)
  	 */
  	preempt_enable();

Maybe we remove preempt* as well now (perhaps as a follow up patch) since that was added by f731a8e89f8c78 "ARC: show_regs: lockdep: re-enable preemption" where show_regs -> print_task_path_n_nm -> mmput was triggering lockdep splat which is supposedly removed.


-	print_task_path_n_nm(tsk);
  	show_regs_print_info(KERN_INFO);

  	show_ecr_verbose(regs);
--
2.37.1


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