On Thu, Mar 06, 2014 at 02:45:00PM +0100, Rasmus Villemoes wrote: > Peter Zijlstra <[email protected]> writes: > > > On Thu, Mar 06, 2014 at 02:24:43PM +0100, Rasmus Villemoes wrote: > >> Is it possible to implement non-sleeping versions of {get,put}_user()? > > > > __{get,put}_user() > > Huh? > > arch/x86/include/asm/uaccess.h: > > /** > * __get_user: - Get a simple variable from user space, with less checking. > * @x: Variable to store result. > * @ptr: Source address, in user space. > * > * Context: User context only. This function may sleep. > > What am I missing?
__get_user() -> __get_user_nocheck() -> __get_user_size() -> __get_user_asm() And __get_user_asm() seems to generate the required .fixup section for this to work in pagefault_disable() context. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
