um: Remove unused os_process_parent

The function is not used anywhere.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://patch.msgid.link/20240913134442.967599-3-benjamin@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 0 insertions, 40 deletions

diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index c8c1a93c8d2c..4bdd4fb5dd80 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -199,7 +199,6 @@ extern int create_mem_file(unsigned long long len);
 extern void report_enomem(void);
 
 /* process.c */
-extern int os_process_parent(int pid);
 extern void os_alarm_process(int pid);
 extern void os_stop_process(int pid);
 extern void os_kill_process(int pid, int reap_child);
diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c
index 6b74a8d91e06..b25c226c5491 100644
--- a/arch/um/os-Linux/process.c
+++ b/arch/um/os-Linux/process.c
@@ -18,45 +18,6 @@
 #include <longjmp.h>
 #include <os.h>
 
-#define FAILURE_PID    -1
-
-#define STAT_PATH_LEN sizeof("/proc/#######/stat\0")
-#define COMM_SCANF "%*[^)])"
-
-int os_process_parent(int pid)
-{
-	char stat[STAT_PATH_LEN];
-	char data[256];
-	int parent = FAILURE_PID, n, fd;
-
-	if (pid == -1)
-		return parent;
-
-	snprintf(stat, sizeof(stat), "/proc/%d/stat", pid);
-	fd = open(stat, O_RDONLY, 0);
-	if (fd < 0) {
-		printk(UM_KERN_ERR "Couldn't open '%s', errno = %d\n", stat,
-		       errno);
-		return parent;
-	}
-
-	CATCH_EINTR(n = read(fd, data, sizeof(data)));
-	close(fd);
-
-	if (n < 0) {
-		printk(UM_KERN_ERR "Couldn't read '%s', errno = %d\n", stat,
-		       errno);
-		return parent;
-	}
-
-	parent = FAILURE_PID;
-	n = sscanf(data, "%*d " COMM_SCANF " %*c %d", &parent);
-	if (n != 1)
-		printk(UM_KERN_ERR "Failed to scan '%s'\n", data);
-
-	return parent;
-}
-
 void os_alarm_process(int pid)
 {
 	kill(pid, SIGALRM);