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Konstantin Belousov authored
Instead do one more allocation at the thread creation time. This frees a lot of space on the stack. Also do not use alloca() for temporal storage in signal delivery sendsig() function and signal return syscall sys_sigreturn(). This saves equal amount of space, again by the cost of one more allocation at the thread creation time. A useful experiment now would be to reduce KSTACK_PAGES. Reviewed by: jhb, markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D31954
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