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authorMaciej W. Rozycki <macro@linux-mips.org>2018-10-02 04:08:49 +0300
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2018-10-04 12:15:55 +0300
commitd197a253855d2d8e507a003880aab35c4e2473db (patch)
treef4c881ee2fc3917c937e7408f4ed8a85473cb796 /drivers/rtc/rtc-cmos.c
parent959e8b77bf9232a1956e03325837047b110553b2 (diff)
downloadlinux-d197a253855d2d8e507a003880aab35c4e2473db.tar.xz
rtc: cmos: Fix non-ACPI undefined reference to `hpet_rtc_interrupt'
Fix a commit 311ee9c151ad ("rtc: cmos: allow using ACPI for RTC alarm instead of HPET") `rtc-cmos' regression causing a link error: drivers/rtc/rtc-cmos.o: In function `cmos_platform_probe': rtc-cmos.c:(.init.text+0x33c): undefined reference to `hpet_rtc_interrupt' rtc-cmos.c:(.init.text+0x3f4): undefined reference to `hpet_rtc_interrupt' with non-ACPI platforms using this driver. The cause is the change of the condition guarding the use of `hpet_rtc_interrupt'. Previously it was a call to `is_hpet_enabled'. That function is static inline and has a hardcoded 0 result for non-ACPI platforms, which imply !HPET_EMULATE_RTC. Consequently the compiler optimized the whole block away including the reference to `hpet_rtc_interrupt', which never made it to the link stage. Now the guarding condition is a call to `use_hpet_alarm', which is not static inline and therefore the compiler may not be able to prove that it actually always returns 0 for non-ACPI platforms. Consequently the build breaks with an unsatisfied reference, because `hpet_rtc_interrupt' is nowhere defined at link time. Fix the problem by marking `use_hpet_alarm' inline. As the `inline' keyword serves as an optimization hint rather than a requirement the compiler is still free to choose whether inlining will be beneficial or not for ACPI platforms. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Fixes: 311ee9c151ad ("rtc: cmos: allow using ACPI for RTC alarm instead of HPET") Cc: stable@vger.kernel.org # 4.18+ Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc/rtc-cmos.c')
-rw-r--r--drivers/rtc/rtc-cmos.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index cd3a2411bc2f..1c98f845102c 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -167,7 +167,7 @@ static inline int hpet_unregister_irq_handler(irq_handler_t handler)
#endif
/* Don't use HPET for RTC Alarm event if ACPI Fixed event is used */
-static int use_hpet_alarm(void)
+static inline int use_hpet_alarm(void)
{
return is_hpet_enabled() && !use_acpi_alarm;
}