From: kbuild test robot <lkp(a)intel.com&gt; arch/x86/mm/ioremap.c:465:8-9: WARNING: return of 0/1 in function 'arch_vmap_p4d_supported' with return type bool arch/x86/mm/ioremap.c:473:8-9: WARNING: return of 0/1 in function 'arch_vmap_pud_supported' with return type bool Return statements in functions returning bool should use true/false instead of 1/0. Generated by: scripts/coccinelle/misc/boolreturn.cocci CC: Nicholas Piggin <npiggin(a)gmail.com&gt; Signed-off-by: kbuild test robot <lkp(a)intel.com&gt; --- url: https://github.com/0day-ci/linux/commits/Nicholas-Piggin/huge-vmalloc-map... base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core ioremap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -462,7 +462,7 @@ EXPORT_SYMBOL(iounmap); bool arch_vmap_p4d_supported(pgprot_t prot) { - return 0; + return false; } bool arch_vmap_pud_supported(pgprot_t prot) @@ -470,7 +470,7 @@ bool arch_vmap_pud_supported(pgprot_t pr #ifdef CONFIG_X86_64 return boot_cpu_has(X86_FEATURE_GBPAGES); #else - return 0; + return false; #endif }