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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/