On Fri, Feb 24, 2017 at 05:35:33PM +0300, Alexey Dobriyan wrote: > On Thu, Feb 23, 2017 at 02:44:31PM -0800, a...@linux-foundation.org wrote: > > /usr/include/linux/sysctl.h:38:2: error: unknown type name 'size_t' > > size_t *oldlenp; > > /usr/include/linux/sysctl.h:40:2: error: unknown type name 'size_t' > > size_t newlen; > > > --- > > a/include/uapi/linux/sysctl.h~uapi-fix-linux-sysctlh-userspace-compilation-errors > > +++ a/include/uapi/linux/sysctl.h > > @@ -26,6 +26,10 @@ > > #include <linux/types.h> > > #include <linux/compiler.h> > > > > +#ifndef __KERNEL__ > > +#include <stddef.h> /* For size_t. */ > > +#endif > > There is __kernel_size_t for cases like this.
No, __kernel_size_t is not for cases like this because size_t differs from __kernel_size_t on x32 and mips n32. Fortunately, there is no sysctl syscall entry on x32, but on mips m32 it is there with number 6152, implemented using compat_sys_sysctl. The latter operates with argument of type struct compat_sysctl_args* where newlen is of type compat_size_t. If you change it from size_t to __kernel_size_t, you'll break mips n32. -- ldv
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