From: W_Armin@gmx.de
To: pali@kernel.org
Cc: linux@roeck-us.net, jdelvare@suse.com, linux-hwmon@vger.kernel.org
Subject: [PATCH RESEND v2] hwmon: (dell-smm) Rework SMM function debugging
Date: Sat, 14 Aug 2021 21:05:16 +0200 [thread overview]
Message-ID: <20210814190516.26718-1-W_Armin@gmx.de> (raw)
From: Armin Wolf <W_Armin@gmx.de>
Drop #ifdef DEBUG and use ktime_us_delta()
for improved precision.
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
---
Changes in v2:
- remove #ifdef DEBUG completly
- init each variable at one line
---
drivers/hwmon/dell-smm-hwmon.c | 21 ++++++---------------
1 file changed, 6 insertions(+), 15 deletions(-)
diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 68af95c1d90c..25fac796fc86 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -158,17 +158,12 @@ static inline const char __init *i8k_get_dmi_data(int field)
*/
static int i8k_smm_func(void *par)
{
- int rc;
+ ktime_t calltime = ktime_get();
struct smm_regs *regs = par;
int eax = regs->eax;
-
-#ifdef DEBUG
int ebx = regs->ebx;
- unsigned long duration;
- ktime_t calltime, delta, rettime;
-
- calltime = ktime_get();
-#endif
+ long long duration;
+ int rc;
/* SMM requires CPU 0 */
if (smp_processor_id() != 0)
@@ -230,13 +225,9 @@ static int i8k_smm_func(void *par)
if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
rc = -EINVAL;
-#ifdef DEBUG
- rettime = ktime_get();
- delta = ktime_sub(rettime, calltime);
- duration = ktime_to_ns(delta) >> 10;
- pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx,
- (rc ? 0xffff : regs->eax & 0xffff), duration);
-#endif
+ duration = ktime_us_delta(ktime_get(), calltime);
+ pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lld usecs)\n", eax, ebx,
+ (rc ? 0xffff : regs->eax & 0xffff), duration);
return rc;
}
--
2.20.1
next reply other threads:[~2021-08-14 19:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-14 19:05 W_Armin [this message]
2021-08-15 10:11 ` [PATCH RESEND v2] hwmon: (dell-smm) Rework SMM function debugging Pali Rohár
2021-08-15 11:40 ` Guenter Roeck
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