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Message-ID: <89df78d0-fb52-9045-2074-1d6f0afae4d9@infradead.org>
Date: Sat, 27 May 2023 16:08:03 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: linux-scsi@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: scsi/stex time_after() build warnings
Hi,
When I build stex.o for i386, I see these build warnings:
In file included from ../include/linux/bitops.h:7,
from ../include/linux/kernel.h:22,
from ../drivers/scsi/stex.c:13:
../drivers/scsi/stex.c: In function ‘stex_common_handshake’:
../include/linux/typecheck.h:12:25: warning: comparison of distinct pointer types lacks a cast
12 | (void)(&__dummy == &__dummy2); \
| ^~
../include/linux/jiffies.h:106:10: note: in expansion of macro ‘typecheck’
106 | typecheck(unsigned long, b) && \
| ^~~~~~~~~
../drivers/scsi/stex.c:1035:29: note: in expansion of macro ‘time_after’
1035 | if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
| ^~~~~~~~~~
../include/linux/typecheck.h:12:25: warning: comparison of distinct pointer types lacks a cast
12 | (void)(&__dummy == &__dummy2); \
| ^~
../include/linux/jiffies.h:106:10: note: in expansion of macro ‘typecheck’
106 | typecheck(unsigned long, b) && \
| ^~~~~~~~~
../drivers/scsi/stex.c:1085:21: note: in expansion of macro ‘time_after’
1085 | if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
| ^~~~~~~~~~
../drivers/scsi/stex.c: In function ‘stex_ss_handshake’:
../include/linux/typecheck.h:12:25: warning: comparison of distinct pointer types lacks a cast
12 | (void)(&__dummy == &__dummy2); \
| ^~
../include/linux/jiffies.h:106:10: note: in expansion of macro ‘typecheck’
106 | typecheck(unsigned long, b) && \
| ^~~~~~~~~
../drivers/scsi/stex.c:1121:29: note: in expansion of macro ‘time_after’
1121 | if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
| ^~~~~~~~~~
../include/linux/typecheck.h:12:25: warning: comparison of distinct pointer types lacks a cast
12 | (void)(&__dummy == &__dummy2); \
| ^~
../include/linux/jiffies.h:106:10: note: in expansion of macro ‘typecheck’
106 | typecheck(unsigned long, b) && \
| ^~~~~~~~~
../drivers/scsi/stex.c:1133:29: note: in expansion of macro ‘time_after’
1133 | if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
| ^~~~~~~~~~
../include/linux/typecheck.h:12:25: warning: comparison of distinct pointer types lacks a cast
12 | (void)(&__dummy == &__dummy2); \
| ^~
../include/linux/jiffies.h:106:10: note: in expansion of macro ‘typecheck’
106 | typecheck(unsigned long, b) && \
| ^~~~~~~~~
../drivers/scsi/stex.c:1186:29: note: in expansion of macro ‘time_after’
1186 | if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
| ^~~~~~~~~~
../include/linux/typecheck.h:12:25: warning: comparison of distinct pointer types lacks a cast
12 | (void)(&__dummy == &__dummy2); \
| ^~
../include/linux/jiffies.h:106:10: note: in expansion of macro ‘typecheck’
106 | typecheck(unsigned long, b) && \
| ^~~~~~~~~
../drivers/scsi/stex.c:1199:29: note: in expansion of macro ‘time_after’
1199 | if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
| ^~~~~~~~~~
../drivers/scsi/stex.c: In function ‘stex_yos_reset’:
../include/linux/typecheck.h:12:25: warning: comparison of distinct pointer types lacks a cast
12 | (void)(&__dummy == &__dummy2); \
| ^~
../include/linux/jiffies.h:106:10: note: in expansion of macro ‘typecheck’
106 | typecheck(unsigned long, b) && \
| ^~~~~~~~~
../drivers/scsi/stex.c:1355:21: note: in expansion of macro ‘time_after’
1355 | if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ)) {
| ^~~~~~~~~~
../drivers/scsi/stex.c: In function ‘stex_hba_stop’:
../include/linux/typecheck.h:12:25: warning: comparison of distinct pointer types lacks a cast
12 | (void)(&__dummy == &__dummy2); \
| ^~
../include/linux/jiffies.h:106:10: note: in expansion of macro ‘typecheck’
106 | typecheck(unsigned long, b) && \
| ^~~~~~~~~
../drivers/scsi/stex.c:1902:21: note: in expansion of macro ‘time_after’
1902 | if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ)) {
| ^~~~~~~~~~
but I don't see this type of warning for any other SCSI drivers
and I don't see this problem for stex.o on x86_64.
Does anyone have a clue about why this happens?
If I modify each timer_after() check to use a calculated unsigned long
variable, the warnings do not happen (as in the patch below).
Thanks.
--
~Randy
---
drivers/scsi/stex.c | 32 ++++++++++++++++++++------------
1 file changed, 20 insertions(+), 12 deletions(-)
diff -- a/drivers/scsi/stex.c b/drivers/scsi/stex.c
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -1025,14 +1025,15 @@ static int stex_common_handshake(struct
struct handshake_frame *h;
dma_addr_t status_phys;
u32 data;
- unsigned long before;
+ unsigned long before, timeout;
if (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
writel(MU_INBOUND_DOORBELL_HANDSHAKE, base + IDBL);
readl(base + IDBL);
before = jiffies;
while (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
- if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
+ timeout = before + MU_MAX_DELAY * HZ;
+ if (time_after(jiffies, timeout)) {
printk(KERN_ERR DRV_NAME
"(%s): no handshake signature\n",
pci_name(hba->pdev));
@@ -1082,7 +1083,8 @@ static int stex_common_handshake(struct
udelay(10);
before = jiffies;
while (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
- if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
+ timeout = before + MU_MAX_DELAY * HZ;
+ if (time_after(jiffies, timeout)) {
printk(KERN_ERR DRV_NAME
"(%s): no signature after handshake frame\n",
pci_name(hba->pdev));
@@ -1110,7 +1112,7 @@ static int stex_ss_handshake(struct st_h
struct handshake_frame *h;
__le32 *scratch;
u32 data, scratch_size, mailboxdata, operationaldata;
- unsigned long before;
+ unsigned long before, timeout;
int ret = 0;
before = jiffies;
@@ -1118,7 +1120,8 @@ static int stex_ss_handshake(struct st_h
if (hba->cardtype == st_yel) {
operationaldata = readl(base + YIOA_STATUS);
while (operationaldata != SS_MU_OPERATIONAL) {
- if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
+ timeout = before + MU_MAX_DELAY * HZ;
+ if (time_after(jiffies, timeout)) {
printk(KERN_ERR DRV_NAME
"(%s): firmware not operational\n",
pci_name(hba->pdev));
@@ -1130,7 +1133,8 @@ static int stex_ss_handshake(struct st_h
} else {
operationaldata = readl(base + PSCRATCH3);
while (operationaldata != SS_MU_OPERATIONAL) {
- if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
+ timeout = before + MU_MAX_DELAY * HZ;
+ if (time_after(jiffies, timeout)) {
printk(KERN_ERR DRV_NAME
"(%s): firmware not operational\n",
pci_name(hba->pdev));
@@ -1183,7 +1187,8 @@ static int stex_ss_handshake(struct st_h
scratch = hba->scratch;
if (hba->cardtype == st_yel) {
while (!(le32_to_cpu(*scratch) & SS_STS_HANDSHAKE)) {
- if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
+ timeout = before + MU_MAX_DELAY * HZ;
+ if (time_after(jiffies, timeout)) {
printk(KERN_ERR DRV_NAME
"(%s): no signature after handshake frame\n",
pci_name(hba->pdev));
@@ -1196,7 +1201,8 @@ static int stex_ss_handshake(struct st_h
} else {
mailboxdata = readl(base + MAILBOX_BASE + MAILBOX_HNDSHK_STS);
while (mailboxdata != SS_STS_HANDSHAKE) {
- if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
+ timeout = before + MU_MAX_DELAY * HZ;
+ if (time_after(jiffies, timeout)) {
printk(KERN_ERR DRV_NAME
"(%s): no signature after handshake frame\n",
pci_name(hba->pdev));
@@ -1344,7 +1350,7 @@ static void stex_hard_reset(struct st_hb
static int stex_yos_reset(struct st_hba *hba)
{
void __iomem *base;
- unsigned long flags, before;
+ unsigned long flags, before, timeout;
int ret = 0;
base = hba->mmio_base;
@@ -1352,7 +1358,8 @@ static int stex_yos_reset(struct st_hba
readl(base + IDBL); /* flush */
before = jiffies;
while (hba->out_req_cnt > 0) {
- if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ)) {
+ timeout = before + ST_INTERNAL_TIMEOUT * HZ;
+ if (time_after(jiffies, timeout)) {
printk(KERN_WARNING DRV_NAME
"(%s): reset timeout\n", pci_name(hba->pdev));
ret = -1;
@@ -1852,7 +1859,7 @@ static void stex_hba_stop(struct st_hba
struct req_msg *req;
struct st_msg_header *msg_h;
unsigned long flags;
- unsigned long before;
+ unsigned long before, timeout;
u16 tag = 0;
spin_lock_irqsave(hba->host->host_lock, flags);
@@ -1899,7 +1906,8 @@ static void stex_hba_stop(struct st_hba
spin_unlock_irqrestore(hba->host->host_lock, flags);
before = jiffies;
while (hba->ccb[tag].req_type & PASSTHRU_REQ_TYPE) {
- if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ)) {
+ timeout = before + ST_INTERNAL_TIMEOUT * HZ;
+ if (time_after(jiffies, timeout)) {
hba->ccb[tag].req_type = 0;
hba->mu_status = MU_STATE_STOP;
return;
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