Currently arch_validate_flags() is written in a very non-extensible fashion, returning immediately if MTE is not supported and writing the MTE check as a direct return. Since we will want to add more checks for GCS refactor the existing code to be more extensible, no functional change intended. Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@xxxxxxxxxx> Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx> Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> --- arch/arm64/include/asm/mman.h | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h index 5966ee4a6154..c21849ffdd88 100644 --- a/arch/arm64/include/asm/mman.h +++ b/arch/arm64/include/asm/mman.h @@ -52,11 +52,17 @@ static inline bool arch_validate_prot(unsigned long prot, static inline bool arch_validate_flags(unsigned long vm_flags) { - if (!system_supports_mte()) - return true; + if (system_supports_mte()) { + /* + * only allow VM_MTE if VM_MTE_ALLOWED has been set + * previously + */ + if ((vm_flags & VM_MTE) && !(vm_flags & VM_MTE_ALLOWED)) + return false; + } + + return true; - /* only allow VM_MTE if VM_MTE_ALLOWED has been set previously */ - return !(vm_flags & VM_MTE) || (vm_flags & VM_MTE_ALLOWED); } #define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags) -- 2.39.2