[issue2183] kern.ipc.shmmax is limited to 31 bits

["Francois Tigeot \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

New submission from Francois Tigeot <ftigeot@wolfpond.org>:

System: DragonFly 2.10/x86_64
kern.ipc.shmmax

Trying to set the kern.ipc.shmmax limit to 4GB fails:

# sysctl kern.ipc.shmmax=4294967296
kern.ipc.shmmax: 33554432 -> 0

2^31 is interpreted as a negative number:
# sysctl kern.ipc.shmmax=2147483648 (2^31)
kern.ipc.shmmax: 0 -> -2147483648

and (2^31 -1) as a positive one:
#sysctl kern.ipc.shmmax=2147483647
kern.ipc.shmmax: -2147483648 -> 2147483647

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keyword: kernel, x86-64
messages: 10282
nosy: ftigeot
priority: bug
status: unread
title: kern.ipc.shmmax is limited to 31 bits

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