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UTCBs are mmap'ed only when needed.

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In case of cloned threads, UTCBs may or may not need to be mmapped.
This is now checked before the do_mmap call via find_vma().
This commit is contained in:
Bahadir Balban
2009-05-01 14:52:06 +03:00
parent b1b3b59561
commit 8ca0ca9cfb
1 changed files with 12 additions and 7 deletions
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19
tasks/mm0/src/utcb.c
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@@ -9,6 +9,7 @@
#include <mmap.h>
#include <utcb.h>
#include <lib/malloc.h>
#include <vm_area.h>
/*
* UTCB management in Codezero
@@ -108,13 +109,17 @@ int task_setup_utcb(struct tcb *task)
slot = task_new_utcb_desc(task);
out:
/* Map this region as private to current task */
if (IS_ERR(err = do_mmap(0, 0, task, slot,
VMA_ANONYMOUS | VMA_PRIVATE | VMA_FIXED |
VM_READ | VM_WRITE, 1))) {
printf("UTCB: mmapping failed with %d\n", err);
return (int)err;
}
/* Check if utcb is already mapped (in case of multiple threads) */
if (!find_vma(slot, &task->vm_area_head->list)) {
/* Map this region as private to current task */
if (IS_ERR(err = do_mmap(0, 0, task, slot,
VMA_ANONYMOUS | VMA_PRIVATE |
VMA_FIXED | VM_READ | VM_WRITE, 1))) {
printf("UTCB: mmapping failed with %d\n", err);
return (int)err;
}
} else
printf("UTCB at 0x%x already mapped.\n", slot);
/* Assign task's utcb address */
task->utcb_address = slot;