linux-kernel - [PATCH] m68knommu: fix undefined reference to `mach_get_rtc

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Date:   Fri, 13 May 2022 16:49:52 +1000
From:   Greg Ungerer <gerg@...ux-m68k.org>
To:     linux-m68k@...r.kernel.org
Cc:     geert@...ux-m68k.org, linux-kernel@...r.kernel.org, arnd@...db.de,
        Greg Ungerer <gerg@...ux-m68k.org>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH] m68knommu: fix undefined reference to `mach_get_rtc_pll'

Configuring for a nommu classic m68k target and enabling the generic rtc
driver (CONFIG_RTC_DRV_GENERIC) will result in the following compile
error:

   m68k-linux-ld: arch/m68k/kernel/time.o: in function `rtc_ioctl':
   time.c:(.text+0x82): undefined reference to `mach_get_rtc_pll'
   m68k-linux-ld: time.c:(.text+0xbc): undefined reference to `mach_set_rtc_pll'
   m68k-linux-ld: time.c:(.text+0xf4): undefined reference to `mach_set_rtc_pll'

"mach_set_rtc_pll" and "mach_get_rtc_pll" are only defined in the common
MMU setup code, and are really only implemented in any meaningful way on
classic M68K MMU enabled machines. So conditionally limit their use to
MMU enabled classic M68K systems.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Greg Ungerer <gerg@...ux-m68k.org>
---
 arch/m68k/kernel/time.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/m68k/kernel/time.c b/arch/m68k/kernel/time.c
index 340ffeea0a9d..c8b70b425ada 100644
--- a/arch/m68k/kernel/time.c
+++ b/arch/m68k/kernel/time.c
@@ -62,7 +62,7 @@ void timer_heartbeat(void)
 }
 #endif /* CONFIG_HEARTBEAT */
 
-#ifdef CONFIG_M68KCLASSIC
+#if defined(CONFIG_M68KCLASSIC) && defined(CONFIG_MMU)
 #if !IS_BUILTIN(CONFIG_RTC_DRV_GENERIC)
 void read_persistent_clock64(struct timespec64 *ts)
 {
@@ -140,7 +140,7 @@ static int __init rtc_init(void)
 
 module_init(rtc_init);
 #endif /* CONFIG_RTC_DRV_GENERIC */
-#endif /* CONFIG M68KCLASSIC */
+#endif /* CONFIG M68KCLASSIC && CONFIG_MMU */
 
 void __init time_init(void)
 {
-- 
2.25.1