tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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sparc64: vdso: Use 32-bit CHECKFLAGS for compat vDSO

When building the compat vDSO the CHECKFLAGS from the 64-bit kernel
are used. These are combined with the 32-bit CFLAGS. This confuses
sparse, producing false-positive warnings or potentially missing
real issues.

Manually override the CHECKFLAGS for the compat vDSO with the correct
32-bit configuration.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20260302-vdso-compat-checkflags-v2-2-78e55baa58ba@linutronix.de
Closes: https://lore.kernel.org/lkml/202511030021.9v1mIgts-lkp@intel.com/

authored by

Thomas Weißschuh and committed by
Thomas Gleixner 273aaa8e 56f85f67

+3
+3
arch/sparc/vdso/Makefile
··· 90 90 KBUILD_CFLAGS_32 += -mv8plus 91 91 $(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) 92 92 93 + CHECKFLAGS_32 := $(filter-out -m64 -D__sparc_v9__ -D__arch64__, $(CHECKFLAGS)) -m32 94 + $(obj)/vdso32.so.dbg: CHECKFLAGS = $(CHECKFLAGS_32) 95 + 93 96 $(obj)/vdso32.so.dbg: FORCE \ 94 97 $(obj)/vdso32/vdso32.lds \ 95 98 $(obj)/vdso32/vclock_gettime.o \