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Minimize conditional compilation for handling of M_EXEC.

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This simplifies some planned changes.  No functional change intended.

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D24474
This commit is contained in:
Mark Johnston 2020-04-21 15:55:28 +00:00
parent f527d7de58
commit 303b77029b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=360153
1 changed files with 3 additions and 10 deletions
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13
sys/vm/vm_kern.c
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@ -402,14 +402,10 @@ kmem_malloc_domain(int domain, vm_size_t size, int flags)
vm_offset_t addr;
int rv;
#if VM_NRESERVLEVEL > 0
if (__predict_true((flags & M_EXEC) == 0))
arena = vm_dom[domain].vmd_kernel_arena;
else
arena = vm_dom[domain].vmd_kernel_rwx_arena;
#else
arena = vm_dom[domain].vmd_kernel_arena;
#endif
size = round_page(size);
if (vmem_alloc(arena, size, flags | M_BESTFIT, &addr))
return (0);
@ -501,10 +497,8 @@ kmem_back_domain(int domain, vm_object_t object, vm_offset_t addr,
vm_page_valid(m);
pmap_enter(kernel_pmap, addr + i, m, prot,
prot | PMAP_ENTER_WIRED, 0);
#if VM_NRESERVLEVEL > 0
if (__predict_false((prot & VM_PROT_EXECUTE) != 0))
m->oflags |= VPO_KMEM_EXEC;
#endif
}
VM_OBJECT_WUNLOCK(object);
@ -578,14 +572,10 @@ _kmem_unback(vm_object_t object, vm_offset_t addr, vm_size_t size)
VM_OBJECT_WLOCK(object);
m = vm_page_lookup(object, atop(offset));
domain = vm_phys_domain(m);
#if VM_NRESERVLEVEL > 0
if (__predict_true((m->oflags & VPO_KMEM_EXEC) == 0))
arena = vm_dom[domain].vmd_kernel_arena;
else
arena = vm_dom[domain].vmd_kernel_rwx_arena;
#else
arena = vm_dom[domain].vmd_kernel_arena;
#endif
for (; offset < end; offset += PAGE_SIZE, m = next) {
next = vm_page_next(m);
vm_page_xbusy_claim(m);
@ -814,6 +804,9 @@ kmem_init(vm_offset_t start, vm_offset_t end)
vmem_set_import(vm_dom[domain].vmd_kernel_rwx_arena,
kva_import_domain, (vmem_release_t *)vmem_xfree,
kernel_arena, KVA_QUANTUM);
#else
vm_dom[domain].vmd_kernel_rwx_arena =
vm_dom[domain].vmd_kernel_arena;
#endif
}