Subject: Re: Git 2.54.0-rc1, subtests of t5310, t5326, t5327

From: Jeff King <[email-masked]>
Date: Thu, 9 Apr 2026 18:58:06 -0400

On Thu, Apr 09, 2026 at 06:40:00PM -0400, [email-masked] wrote:

> >> Please do not make the change in git-compat-util. This will break xwrite().
> >> We already have MAX_IO_SIZE working and verified from years ago.
> >> Changing that will remove our platform from being supportable.
> >
> >I think that was just there to demonstrate that the patch works regardless of the
> >size, and would not be included in the final.
> >Building with:
> >
> >  make CFLAGS=-DMAX_IO_SIZE=128
> >
> >is probably a nicer way of doing that, though. ;)
> 
> We had that set properly in git-compat-util.h for years. MAX_IO_SIZE should be set to SSIZE_MAX if SSIZE_MAX is defined.
> #ifndef MAX_IO_SIZE
> # define MAX_IO_SIZE_DEFAULT (8*1024*1024)
> # if defined(SSIZE_MAX) && (SSIZE_MAX < MAX_IO_SIZE_DEFAULT)
> #  define MAX_IO_SIZE SSIZE_MAX
> # else
> #  define MAX_IO_SIZE MAX_IO_SIZE_DEFAULT

Right. We would retain that. I think the point was that Patrick was
dropping MAX_IO_SIZE artificially on his Linux system to exercise the
new code.

-Peff