Revision 4ceb5db9757aaeadcf8fbbf97d76bd42aa4df0d6 authored by Linus Torvalds on 01 August 2005, 18:14:49 UTC, committed by Linus Torvalds on 01 August 2005, 18:14:49 UTC
There's no real guarantee that handle_mm_fault() will always be able to break a COW situation - if an update from another thread ends up modifying the page table some way, handle_mm_fault() may end up requiring us to re-try the operation. That's normally fine, but get_user_pages() ended up re-trying it as a read, and thus a write access could in theory end up losing the dirty bit or be done on a page that had not been properly COW'ed. This makes get_user_pages() always retry write accesses as write accesses by making "follow_page()" require that a writable follow has the dirty bit set. That simplifies the code and solves the race: if the COW break fails for some reason, we'll just loop around and try again. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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| File | Mode | Size |
|---|---|---|
| basic | ||
| genksyms | ||
| kconfig | ||
| ksymoops | ||
| lxdialog | ||
| mod | ||
| package | ||
| Lindent | -rwxr-xr-x | 60 bytes |
| Makefile | -rw-r--r-- | 801 bytes |
| Makefile.build | -rw-r--r-- | 9.8 KB |
| Makefile.clean | -rw-r--r-- | 2.9 KB |
| Makefile.host | -rw-r--r-- | 5.8 KB |
| Makefile.lib | -rw-r--r-- | 9.9 KB |
| Makefile.modinst | -rw-r--r-- | 825 bytes |
| Makefile.modpost | -rw-r--r-- | 3.4 KB |
| bin2c.c | -rw-r--r-- | 702 bytes |
| binoffset.c | -rw-r--r-- | 3.9 KB |
| checkconfig.pl | -rwxr-xr-x | 1.7 KB |
| checkincludes.pl | -rwxr-xr-x | 529 bytes |
| checkstack.pl | -rw-r--r-- | 3.5 KB |
| checkversion.pl | -rwxr-xr-x | 1.9 KB |
| conmakehash.c | -rw-r--r-- | 6.0 KB |
| extract-ikconfig | -rwxr-xr-x | 1.6 KB |
| gcc-version.sh | -rw-r--r-- | 338 bytes |
| gen_initramfs_list.sh | -rw-r--r-- | 4.7 KB |
| kallsyms.c | -rw-r--r-- | 17.7 KB |
| kernel-doc | -rwxr-xr-x | 49.7 KB |
| makelst | -rwxr-xr-x | 941 bytes |
| mkcompile_h | -rwxr-xr-x | 2.1 KB |
| mkmakefile | -rw-r--r-- | 563 bytes |
| mksysmap | -rw-r--r-- | 1.3 KB |
| mkuboot.sh | -rwxr-xr-x | 293 bytes |
| mkversion | -rw-r--r-- | 74 bytes |
| namespace.pl | -rw-r--r-- | 13.1 KB |
| patch-kernel | -rwxr-xr-x | 9.7 KB |
| pnmtologo.c | -rw-r--r-- | 11.7 KB |
| reference_discarded.pl | -rw-r--r-- | 3.2 KB |
| reference_init.pl | -rw-r--r-- | 3.3 KB |
| show_delta | -rw-r--r-- | 3.0 KB |
| ver_linux | -rwxr-xr-x | 3.0 KB |
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