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* New warning in linus/master
@ 2026-04-22  3:51 Ricardo Ribalda
  2026-04-22  5:56 ` Thomas Weißschuh
  0 siblings, 1 reply; 8+ messages in thread
From: Ricardo Ribalda @ 2026-04-22  3:51 UTC (permalink / raw)
  To: Thomas Weißschuh, linux-arm-kernel,
	Linux Kernel Mailing List, linuxppc-dev

Hi Thomas

Media-CI has found a couple of new warnings in the latest kernel
version for aarch64 and powerpc. They get fixed with this patch and
before moving I wanted to know if this was under your radar.



diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
index 7dec05dd33b7..65914842fae0 100644
--- a/arch/arm64/kernel/vdso/Makefile
+++ b/arch/arm64/kernel/vdso/Makefile
@@ -50,7 +50,7 @@ CFLAGS_vgettimeofday.o = $(CC_FLAGS_ADD_VDSO)
 CFLAGS_vgetrandom.o = $(CC_FLAGS_ADD_VDSO)

 ifneq ($(c-gettimeofday-y),)
-  CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
+  CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
-Wno-maybe-uninitialized
 endif

 ifneq ($(c-getrandom-y),)
diff --git a/arch/powerpc/kernel/vdso/Makefile
b/arch/powerpc/kernel/vdso/Makefile
index 8834dfe9d727..4b8d40b1dfeb 100644
--- a/arch/powerpc/kernel/vdso/Makefile
+++ b/arch/powerpc/kernel/vdso/Makefile
@@ -12,12 +12,12 @@ obj-vdso32 += getrandom-32.o vgetrandom-chacha-32.o
 obj-vdso64 += getrandom-64.o vgetrandom-chacha-64.o

 ifneq ($(c-gettimeofday-y),)
-  CFLAGS_vgettimeofday-32.o += -include $(c-gettimeofday-y)
+  CFLAGS_vgettimeofday-32.o += -include $(c-gettimeofday-y)
-Wno-maybe-uninitialized
 # Go prior to 1.16.x assumes r30 is not clobbered by any VDSO code.
That used to be true
 # by accident when the VDSO was hand-written asm code, but may not be
now that the VDSO is
 # compiler generated. To avoid breaking Go tell GCC not to use r30.
Impact on code
 # generation is minimal, it will just use r29 instead.
-  CFLAGS_vgettimeofday-64.o += -include $(c-gettimeofday-y) $(call
cc-option, -ffixed-r30)
+  CFLAGS_vgettimeofday-64.o += -include $(c-gettimeofday-y) $(call
cc-option, -ffixed-r30) -Wno-maybe-uninitialized
 endif

 ifneq ($(c-getrandom-y),)


https://gitlab.freedesktop.org/linux-media/users/ribalda/-/pipelines/1649144/test_report?job_name=cross-gcc


CONFIG_CC_VERSION_TEXT="aarch64-linux-gnu-gcc (Debian 15.2.0-16) 15.2.0"
  SYNC    include/config/auto.conf
  CC      arch/arm64/kernel/vdso/vgettimeofday.o
In file included from <command-line>:
In function ‘vdso_set_timespec’,
    inlined from ‘do_aux’ at /workdir/lib/vdso/gettimeofday.c:266:2,
    inlined from ‘__cvdso_clock_gettime_common’ at
/workdir/lib/vdso/gettimeofday.c:293:10,
    inlined from ‘__cvdso_clock_gettime_data.constprop’ at
/workdir/lib/vdso/gettimeofday.c:306:7:
/workdir/lib/vdso/gettimeofday.c:104:26: warning: ‘sec’ may be used
uninitialized [-Wmaybe-uninitialized]
  104 |         ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
      |                      ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/workdir/lib/vdso/gettimeofday.c: In function
‘__cvdso_clock_gettime_data.constprop’:
/workdir/lib/vdso/gettimeofday.c:242:13: note: ‘sec’ was declared here
  242 |         u64 sec, ns;
      |             ^~~
In file included from /workdir/lib/vdso/gettimeofday.c:11:
In function ‘__iter_div_u64_rem’,
    inlined from ‘vdso_set_timespec’ at /workdir/lib/vdso/gettimeofday.c:104:21,
    inlined from ‘do_aux’ at /workdir/lib/vdso/gettimeofday.c:266:2,
    inlined from ‘__cvdso_clock_gettime_common’ at
/workdir/lib/vdso/gettimeofday.c:293:10,
    inlined from ‘__cvdso_clock_gettime_data.constprop’ at
/workdir/lib/vdso/gettimeofday.c:306:7:
./include/vdso/math64.h:10:25: warning: ‘ns’ may be used uninitialized
[-Wmaybe-uninitialized]
   10 |         while (dividend >= divisor) {
      |                ~~~~~~~~~^~~~~~~~~~
/workdir/lib/vdso/gettimeofday.c: In function
‘__cvdso_clock_gettime_data.constprop’:
/workdir/lib/vdso/gettimeofday.c:242:18: note: ‘ns’ was declared here
  242 |         u64 sec, ns;
      |                  ^~
  LD      arch/arm64/kernel/vdso/vdso.so.dbg
  VDSOSYM include/generated/vdso-offsets.h
  OBJCOPY arch/arm64/kernel/vdso/vdso.so
/workdir/lib/vdso/gettimeofday.c:104:26: warning: ‘sec’ may be used
uninitialized [-Wmaybe-uninitialized]
./include/vdso/math64.h:10:25: warning: ‘ns’ may be used uninitialized
[-Wmaybe-uninitialized]

CONFIG_CC_VERSION_TEXT="powerpc64-linux-gnu-gcc (Debian 15.2.0-15) 15.2.0"
  SYNC    include/config/auto.conf
  VDSO32C arch/powerpc/kernel/vdso/vgettimeofday-32.o
In file included from <command-line>:
In function ‘vdso_set_timespec’,
    inlined from ‘do_aux’ at /workdir/lib/vdso/gettimeofday.c:266:2,
    inlined from ‘__cvdso_clock_gettime_common’ at
/workdir/lib/vdso/gettimeofday.c:293:10,
    inlined from ‘__cvdso_clock_gettime32_data’ at
/workdir/lib/vdso/gettimeofday.c:327:7:
/workdir/lib/vdso/gettimeofday.c:104:26: warning: ‘sec’ may be used
uninitialized [-Wmaybe-uninitialized]
  104 |         ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
      |                      ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/workdir/lib/vdso/gettimeofday.c: In function ‘__cvdso_clock_gettime32_data’:
/workdir/lib/vdso/gettimeofday.c:242:13: note: ‘sec’ was declared here
  242 |         u64 sec, ns;
      |             ^~~
In file included from /workdir/lib/vdso/gettimeofday.c:11:
In function ‘__iter_div_u64_rem’,
    inlined from ‘vdso_set_timespec’ at /workdir/lib/vdso/gettimeofday.c:104:21,
    inlined from ‘do_aux’ at /workdir/lib/vdso/gettimeofday.c:266:2,
    inlined from ‘__cvdso_clock_gettime_common’ at
/workdir/lib/vdso/gettimeofday.c:293:10,
    inlined from ‘__cvdso_clock_gettime32_data’ at
/workdir/lib/vdso/gettimeofday.c:327:7:
./include/vdso/math64.h:10:25: warning: ‘ns’ may be used uninitialized
[-Wmaybe-uninitialized]
   10 |         while (dividend >= divisor) {
      |                ~~~~~~~~~^~~~~~~~~~
/workdir/lib/vdso/gettimeofday.c: In function ‘__cvdso_clock_gettime32_data’:
/workdir/lib/vdso/gettimeofday.c:242:18: note: ‘ns’ was declared here
  242 |         u64 sec, ns;
      |                  ^~
In function ‘vdso_set_timespec’,
    inlined from ‘do_aux’ at /workdir/lib/vdso/gettimeofday.c:266:2,
    inlined from ‘__cvdso_clock_gettime_common’ at
/workdir/lib/vdso/gettimeofday.c:293:10,
    inlined from ‘__cvdso_clock_gettime_data’ at
/workdir/lib/vdso/gettimeofday.c:306:7:
/workdir/lib/vdso/gettimeofday.c:104:26: warning: ‘sec’ may be used
uninitialized [-Wmaybe-uninitialized]
  104 |         ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
      |                      ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/workdir/lib/vdso/gettimeofday.c: In function ‘__cvdso_clock_gettime_data’:
/workdir/lib/vdso/gettimeofday.c:242:13: note: ‘sec’ was declared here
  242 |         u64 sec, ns;
      |             ^~~
In function ‘__iter_div_u64_rem’,
    inlined from ‘vdso_set_timespec’ at /workdir/lib/vdso/gettimeofday.c:104:21,
    inlined from ‘do_aux’ at /workdir/lib/vdso/gettimeofday.c:266:2,
    inlined from ‘__cvdso_clock_gettime_common’ at
/workdir/lib/vdso/gettimeofday.c:293:10,
    inlined from ‘__cvdso_clock_gettime_data’ at
/workdir/lib/vdso/gettimeofday.c:306:7:
./include/vdso/math64.h:10:25: warning: ‘ns’ may be used uninitialized
[-Wmaybe-uninitialized]
   10 |         while (dividend >= divisor) {
      |                ~~~~~~~~~^~~~~~~~~~
/workdir/lib/vdso/gettimeofday.c: In function ‘__cvdso_clock_gettime_data’:
/workdir/lib/vdso/gettimeofday.c:242:18: note: ‘ns’ was declared here
  242 |         u64 sec, ns;
      |                  ^~
  VDSO32L arch/powerpc/kernel/vdso/vdso32.so.dbg
  VDSO32SYM include/generated/vdso32-offsets.h
  CC      arch/powerpc/kernel/vdso/vgettimeofday-64.o
  VDSO64L arch/powerpc/kernel/vdso/vdso64.so.dbg
  VDSO64SYM include/generated/vdso64-offsets.h
/workdir/lib/vdso/gettimeofday.c:104:26: warning: ‘sec’ may be used
uninitialized [-Wmaybe-uninitialized]
./include/vdso/math64.h:10:25: warning: ‘ns’ may be used uninitialized
[-Wmaybe-uninitialized]
/workdir/lib/vdso/gettimeofday.c:104:26: warning: ‘sec’ may be used
uninitialized [-Wmaybe-uninitialized]
./include/vdso/math64.h:10:25: warning: ‘ns’ may be used uninitialized
[-Wmaybe-uninitialized]

Thanks

-- 
Ricardo Ribalda


^ permalink raw reply related	[flat|nested] 8+ messages in thread
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Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-04-22  3:51 New warning in linus/master Ricardo Ribalda
2026-04-22  5:56 ` Thomas Weißschuh
2026-04-22  7:00   ` Ricardo Ribalda
2026-04-22  7:32     ` Thomas Weißschuh
2026-04-22  8:06       ` Ricardo Ribalda
2026-04-22  8:45         ` Thomas Weißschuh
2026-04-22  9:09           ` Christophe Leroy (CS GROUP)
2026-04-22  7:26   ` Christophe Leroy (CS GROUP)

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