Hi Richard, > On Wed, 2022-11-30 at 09:07 +0100, Alexander Kanavin wrote: > > On Tue, 29 Nov 2022 at 16:45, Stephen Jolley > > <[email protected]> wrote: > > > We’d welcome a proposal/series on how to move forward with the > > > Y2038 work for 32 bit platforms. > > > > I have the following proposal: > > > > 1. A branch is made where: > > a. "-D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64" is enabled globally. > > b. qemu is always started with "-rtc base=2040-01-01", simulating > > Y2038 actually occurring. > > c. an additional runtime test verifies that both RTC clock and > > system clock report 2040. > > > > 2. This branch is run through a-full on the autobuilder. Any > > uncovered issues are filed as bugs. > > > > 3. Once *all* of the bugs are addressed, repeat point 2. > > > > 4. Once there are no more open bugs, 1a is merged into master. > > > > Any fatal flaws in the plan? > > Others have made some good comments. My thoughts: > > * We need to add some runtime tests to oeqa for this (in addition to > the ptests) > > * We need to have a 32 bit ptest run on the autobuilder (qemux86 > should work, not sure we can make qemuarm fast). Whether this is > manually triggered, not sure. We could have a smaller set of ptests > to run for it?
Y2038 ptests maybe? Here is the list of integrated tests to ptests: https://github.com/lmajewski/y2038-tests > > * Could we optionally disable some of the glibc 32 bit function calls > to ensure they're not being used? Could you be more specific here? Would you like to disable some syscalls? > We don't really want to diverge from > upstream glibc much though. Could you be more specific here? The glibc now supports the whole set of syscalls as of 2.34 version? To enable them one needs to pass -D_TIME_BITS=64 flag when compiling programs. This is now the official glibc ABI. > > * We need to work out how to communicate this change happened and have > people "buy in" to it. Ok. > The reason for that is that if someone has > existing binaries, there could be problems using them after the > change. The binary shall work without issues on glibc 2.34+ and 5.10+ kernel without issues. The only problem happens when new binaries with 64 bit time support are run on glibc or kernel not supporting 64 bit time. > We therefore need to be sure they are aware of it. > > Cheers, > > Richard > > > > Best regards, Lukasz Majewski -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: [email protected]
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