On Fri, 26 Jul 2013, Juli Mallett wrote:
On Fri, Jul 26, 2013 at 2:26 PM, Andrey Zonov <z...@freebsd.org> wrote:
On 7/26/13 8:09 AM, Jilles Tjoelker wrote:
As noted in mail from Bruce Evans, please preserve the ABI of
VM_SWAPPING_ENABLED here.
I don't think it's a big problem. Internally we don't use it. Good
code uses sysctlbyname() instead of sysctl(). It doesn't seem to me
this is very popular sysctl. It's also CURRENT without MFC.
That doesn't seem like a great argument.
Why should we break the ABI for bad code that used that sysctl and all
following? It seems pretty trivial to preserve, and no-cost. Also, the
fact that it's in current misses the point completely: it breaks ABI with
older binaries, namely older binaries running on -CURRENT. And not just
for that field.
Especially since the main reason numbered sysctls exist is to support old
binaries (and sources) that use them.
Bruce
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