powerpc/rtas: Make timestamp related code y2038-safe

While we are here, let us make timestamp related code y2038-safe.
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/rtas.h

@@ -4,6 +4,7 @@
 
 #include <linux/spinlock.h>
 #include <asm/page.h>
+#include <linux/time.h>
 
 /*
  * Definitions for talking to the RTAS on CHRP machines.
@@ -343,7 +344,7 @@ extern int early_init_dt_scan_rtas(unsigned long node,
 extern void pSeries_log_error(char *buf, unsigned int err_type, int fatal);
 
 #ifdef CONFIG_PPC_PSERIES
-extern unsigned long last_rtas_event;
+extern time64_t last_rtas_event;
 extern int clobbering_unread_rtas_event(void);
 extern int pseries_devicetree_update(s32 scope);
 extern void post_mobility_fixup(void);

arch/powerpc/kernel/nvram_64.c

@@ -376,7 +376,7 @@ static int zip_oops(size_t text_len)
 	}
 	oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
 	oops_hdr->report_length = cpu_to_be16(zipped_len);
-	oops_hdr->timestamp = cpu_to_be64(get_seconds());
+	oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());
 	return 0;
 }
 
@@ -423,7 +423,7 @@ static int nvram_pstore_write(enum pstore_type_id type,
 
 	oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
 	oops_hdr->report_length = cpu_to_be16(size);
-	oops_hdr->timestamp = cpu_to_be64(get_seconds());
+	oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());
 
 	if (compressed)
 		err_type = ERR_TYPE_KERNEL_PANIC_GZ;
@@ -721,7 +721,7 @@ static void oops_to_nvram(struct kmsg_dumper *dumper,
 		err_type = ERR_TYPE_KERNEL_PANIC;
 		oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
 		oops_hdr->report_length = cpu_to_be16(text_len);
-		oops_hdr->timestamp = cpu_to_be64(get_seconds());
+		oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());
 	}
 
 	(void) nvram_write_os_partition(&oops_log_partition, oops_buf,

arch/powerpc/platforms/pseries/nvram.c

@@ -36,10 +36,10 @@ static DEFINE_SPINLOCK(nvram_lock);
 
 /* See clobbering_unread_rtas_event() */
 #define NVRAM_RTAS_READ_TIMEOUT 5		/* seconds */
-static unsigned long last_unread_rtas_event;	/* timestamp */
+static time64_t last_unread_rtas_event;		/* timestamp */
 
 #ifdef CONFIG_PSTORE
-unsigned long last_rtas_event;
+time64_t last_rtas_event;
 #endif
 
 static ssize_t pSeries_nvram_read(char *buf, size_t count, loff_t *index)
@@ -144,9 +144,9 @@ int nvram_write_error_log(char * buff, int length,
 	int rc = nvram_write_os_partition(&rtas_log_partition, buff, length,
 						err_type, error_log_cnt);
 	if (!rc) {
-		last_unread_rtas_event = get_seconds();
+		last_unread_rtas_event = ktime_get_real_seconds();
 #ifdef CONFIG_PSTORE
-		last_rtas_event = get_seconds();
+		last_rtas_event = ktime_get_real_seconds();
 #endif
 	}
 
@@ -200,7 +200,7 @@ int clobbering_unread_rtas_event(void)
 {
 	return (oops_log_partition.index == rtas_log_partition.index
 		&& last_unread_rtas_event
-		&& get_seconds() - last_unread_rtas_event <=
+		&& ktime_get_real_seconds() - last_unread_rtas_event <=
 						NVRAM_RTAS_READ_TIMEOUT);
 }