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Account for the main process stack being one page below the highest

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user address when ABI uses shared page.

Note that the change is no-op for correctness, since shared page does
not fault.  The mapping for the shared page is installed at the
address space creation, the page is unmanaged and its pte/pv entry
cannot be reclaimed.

Submitted by:	Oliver Pinter
Review:	https://reviews.freebsd.org/D2954
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2015-07-02 15:22:13 +00:00
parent 40fc1dffc3
commit be930a2021
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=285046
1 changed files with 2 additions and 1 deletions
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3
sys/vm/vm_map.c
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@ -3640,7 +3640,8 @@ vm_map_growstack(struct proc *p, vm_offset_t addr)
return (KERN_NO_SPACE);
}
is_procstack = (addr >= (vm_offset_t)vm->vm_maxsaddr) ? 1 : 0;
is_procstack = (addr >= (vm_offset_t)vm->vm_maxsaddr &&
addr < (vm_offset_t)p->p_sysent->sv_usrstack) ? 1 : 0;
/*
* If this is the main process stack, see if we're over the stack