On 2014/4/24 02:26 PM, Chung-Lin Tang wrote: > On 2014/4/24 上午 02:15, Pinski, Andrew wrote: >> >>>> On Apr 23, 2014, at 10:59 AM, "Chung-Lin Tang" <clt...@codesourcery.com> >>>> wrote: >>>> >>>>>> On 2014/4/22 07:20 PM, Ley Foon Tan wrote: >>>>>> On Tue, Apr 22, 2014 at 6:56 PM, Arnd Bergmann <a...@arndb.de> wrote: >>>>>>>>>> On Tuesday 22 April 2014 18:37:11 Ley Foon Tan wrote: >>>>>>>>>>>>>> Hi Arnd and Peter Anvin, >>>>>>>>>>>>>> >>>>>>>>>>>>>> Other than 64-bit time_t, clock_t and suseconds_t, can you >>>>>>>>>>>>>> confirm >>>>>>>>>>>>>> that we don't need to have 64 bit off_t? See detail in link >>>>>>>>>>>>>> below. >>>>>>>>>>>>>> I can submit the patches for 64-bit time changes >>>>>>>>>>>>>> (include/asm-generic/posix_types.h and other archs) if everyone >>>>>>>>>>>>>> is >>>>>>>>>>>>>> agreed on this. >>>>>>>>>> >>>>>>>>>> Yes. >>>>>> Okay, will doing that. >>>> >>>> I believe that arm64 ILP32 will also be affected. What is the status of >>>> this configuration? Has the glibc/kernel ABI been finalized? >> Not yet. I am still working out the signal handling part. But we already >> agreed on 64bit time_t, clock_t, and suseconds_t. And we agreed to a 64bit >> offset_t too. >> >> On a related note suseconds in the timespec in posix is defined to be long. >> So it would nice if the kernel ignores the upper 32bits so we (glibc >> developers) can fix this for new targets including x32 and arm64/ilp32. > > Hmm, but that means for purely 32-bit architectures like nios2, which > unlike x86_64 or arm64, never has a 64-bit mode, suseconds_t as a 64-bit > type in the kernel is simply wasted. > > Chung-Lin
The more I think of this, the more I feel that suseconds_t should jsut be 'long', not strictly 64-bitified. An ILP32 sub-mode in a 64-bit kernel should be using compat_* code paths, something like a COMPAT_USE_32BIT_SUSECONDS case. suseconds_t is for micro-seconds in struct timeval, 32-bit is more than enough. Chung-Lin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
