linux-kernel - Re: [PATCH v2 29/29] y2038: add 64-bit time_t syscalls to all 32-bit architectures

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Message-ID: <20190125155542.GI25901@arrakis.emea.arm.com>
Date:   Fri, 25 Jan 2019 15:55:43 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     y2038@...ts.linaro.org, linux-api@...r.kernel.org,
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Subject: Re: [PATCH v2 29/29] y2038: add 64-bit time_t syscalls to all 32-bit
 architectures

On Fri, Jan 18, 2019 at 05:18:35PM +0100, Arnd Bergmann wrote:
> This adds 21 new system calls on each ABI that has 32-bit time_t
> today. All of these have the exact same semantics as their existing
> counterparts, and the new ones all have macro names that end in 'time64'
> for clarification.
> 
> This gets us to the point of being able to safely use a C library
> that has 64-bit time_t in user space. There are still a couple of
> loose ends to tie up in various areas of the code, but this is the
> big one, and should be entirely uncontroversial at this point.
> 
> In particular, there are four system calls (getitimer, setitimer,
> waitid, and getrusage) that don't have a 64-bit counterpart yet,
> but these can all be safely implemented in the C library by wrapping
> around the existing system calls because the 32-bit time_t they
> pass only counts elapsed time, not time since the epoch. They
> will be dealt with later.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Catalin Marinas <catalin.marinas@....com>

(as long as compat follows the arm32 syscall numbers)