wil6210: fix for 64-bit integer division

On some platforms, cycles_t is 64-bit, and gcc generates call to
__udivdi3 for straight division of cycles_t/cycles_t. This leads
to compilation failure, as this function is not exist in the kernel
runtime. do_div() to rescue

Original report:

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next.git master
head:   2e91606f5e1ec7329557dfc0e298c4c021acbb80
commit: 7c0acf868d2e470c9d6a40091acf8d6444c01b57 [81/103] wil6210: Tx performance monitoring
config: i386-randconfig-ha3-0620 (attached as .config)

All error/warnings:

   drivers/built-in.o: In function `wil_vring_debugfs_show':
>> debugfs.c:(.text+0x39b9be): undefined reference to `__udivdi3'

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c
index 7d1ef4e..a868c5e 100644 (file)
--- a/drivers/net/wireless/ath/wil6210/debugfs.c
+++ b/drivers/net/wireless/ath/wil6210/debugfs.c
@@ -83,9 +83,10 @@ static int wil_vring_debugfs_show(struct seq_file *s, void *data)
                        char name[10];
                        /* performance monitoring */
                        cycles_t now = get_cycles();
-                       cycles_t idle = txdata->idle;
+                       cycles_t idle = txdata->idle * 100;
                        cycles_t total = now - txdata->begin;
 
+                       do_div(idle, total);
                        txdata->begin = now;
                        txdata->idle = 0ULL;
 
@@ -93,7 +94,7 @@ static int wil_vring_debugfs_show(struct seq_file *s, void *data)
 
                        seq_printf(s, "\n%pM CID %d TID %d [%3d|%3d] idle %3d%%\n",
                                   wil->sta[cid].addr, cid, tid, used, avail,
-                                  (int)((idle*100)/total));
+                                  (int)idle);
 
                        wil_print_vring(s, wil, name, vring, '_', 'H');
                }