Hi LKML:
I am reading code of memory management. this process is so challengable.
I have one quetion too.
in do_page_fault() (kernel 2.6.11.11) include one piece of code as
follow:
if (!down_read_trylock(&mm->mmap_sem)) {
if ((error_code & 4) == 0 &&
!search_exception_tables(regs->eip))
goto bad_area_nosemaphore;
down_read(&mm->mmap_sem);
}
I think I can understand these operations on mm->mmap_sem and
"error_code&4".
but how "search_exception_tables(regs->eip)" work here?
In "Understanding Linux kernel 2ed" book, the author say , kernel
must difference two case:
1. kernel memory access problem.
2. Arguments of system call include address of memeory unit is
unmapped.
Well, That is OK. but I want to know what 's mechanism in it ?
3ks. (in Chinese , number 3 read as 'th' :)
liyu
Mon Jul
4 13:23:24 CST 2005
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
| |
 |