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do_mmap(): simplify demand paging flags; avoid zeroobj and allocate pages directly

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Balazs Gerofi
2016-08-17 14:00:05 +09:00
parent 1a207e19c2
commit 9efd568e07
2 changed files with 8 additions and 11 deletions
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15
kernel/syscall.c
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@@ -1079,25 +1079,18 @@ do_mmap(const intptr_t addr0, const size_t len0, const int prot,
vrflags |= PROT_TO_VR_FLAG(prot);
vrflags |= (flags & MAP_PRIVATE)? VR_PRIVATE: 0;
vrflags |= (flags & MAP_LOCKED)? VR_LOCKED: 0;
vrflags |= VR_DEMAND_PAGING;
if (flags & MAP_ANONYMOUS) {
if (0) {
/* dummy */
if (!anon_on_demand) {
populated_mapping = 1;
}
#ifdef USE_NOCACHE_MMAP
#define X_MAP_NOCACHE MAP_32BIT
else if (flags & X_MAP_NOCACHE) {
vrflags &= ~VR_DEMAND_PAGING;
vrflags |= VR_IO_NOCACHE;
}
#endif
else {
vrflags |= VR_DEMAND_PAGING;
if (!anon_on_demand) {
populated_mapping = 1;
}
}
}
else {
vrflags |= VR_DEMAND_PAGING;
}
if (flags & (MAP_POPULATE | MAP_LOCKED)) {