[PATCH] platform/x86: amd-pmc: Fix undefined reference to __udivdi3

From: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
To: <hdegoede@redhat.com>, <mgross@linux.intel.com>
Cc: <platform-driver-x86@vger.kernel.org>,
	Shyam Sundar S K <Shyam-sundar.S-k@amd.com>,
	Randy Dunlap <rdunlap@infradead.org>
Subject: [PATCH] platform/x86: amd-pmc: Fix undefined reference to __udivdi3
Date: Fri, 16 Jul 2021 21:08:02 +0530	[thread overview]
Message-ID: <20210716153802.2929670-1-Shyam-sundar.S-k@amd.com> (raw)

It was reported that on i386 config

------
on i386:

ld: drivers/platform/x86/amd-pmc.o: in function `s0ix_stats_show':
amd-pmc.c:(.text+0x100): undefined reference to `__udivdi3'
-------

The reason for this is that 64-bit integer division is not supported
on 32-bit architecture. Use do_div macro to fix this.

Fixes: b9a4fa6978be ("platform/x86: amd-pmc: Add support for logging s0ix counters")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
---
 drivers/platform/x86/amd-pmc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/amd-pmc.c b/drivers/platform/x86/amd-pmc.c
index 680f94c7e075..45ce1d5e1e6d 100644
--- a/drivers/platform/x86/amd-pmc.c
+++ b/drivers/platform/x86/amd-pmc.c
@@ -189,7 +189,8 @@ static int s0ix_stats_show(struct seq_file *s, void *unused)
 	exit_time = exit_time << 32 | ioread32(dev->fch_virt_addr + FCH_S0I3_EXIT_TIME_L_OFFSET);
 
 	/* It's in 48MHz. We need to convert it */
-	residency = (exit_time - entry_time) / 48;
+	residency = exit_time - entry_time;
+	do_div(residency, 48);
 
 	seq_puts(s, "=== S0ix statistics ===\n");
 	seq_printf(s, "S0ix Entry Time: %lld\n", entry_time);
-- 
2.25.1

