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[PATCH] time: drop dead code from gmtime()
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 8 May 2026 15:31:39 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 08 May 2026 13:31:45 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
"days", as calculated, can't be negative. Drop the respective loop and
change its type. Similarly "rem" can't be negative and doesn't require
more than 32 bits. Change its type, too.
As a consequence, the tm_wday calculation also can't yield negative
values, so the respective conditional can be dropped as well.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- unstable.orig/xen/common/time.c 2025-07-22 16:21:18.000000000 +0200
+++ unstable/xen/common/time.c 2026-05-07 12:22:11.687769995 +0200
@@ -45,7 +45,8 @@ static DEFINE_SPINLOCK(wc_lock);
struct tm gmtime(unsigned long t)
{
struct tm tbuf;
- long days, rem;
+ unsigned long days;
+ unsigned int rem;
int y;
const unsigned short int *ip;
@@ -70,18 +71,11 @@ struct tm gmtime(unsigned long t)
tbuf.tm_sec = rem % 60;
/* January 1, 1970 was a Thursday. */
tbuf.tm_wday = (4 + days) % 7;
- if ( tbuf.tm_wday < 0 )
- tbuf.tm_wday += 7;
while ( days >= (rem = __isleap(y) ? 366 : 365) )
{
++y;
days -= rem;
}
- while ( days < 0 )
- {
- --y;
- days += __isleap(y) ? 366 : 365;
- }
tbuf.tm_year = y - 1900;
tbuf.tm_yday = days;
/* SAF-14-safe use boolean as an array index */
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