![]() | |||||||||||||
Messages in this thread |
From: Russell King <rmk+lkml@arm.linux.org.uk> Date: Sun, 31 Dec 2006 09:23:18 +0000 > We do this on ARM - if page_mapping() is NULL, we flush the kernel > alias unconditionally. However, we have no view where the user > mapping of that page is, which is where the problem is. Cache lines > remain allocated for the user mapping and data contained within is > not visible via the kernel mapping. You can walk the RMAP list. > However, it's not only FUSE which is suffering - direct-IO also doesn't > work. If my analysis is correct, only _two_ users of get_user_pages() > with the current process actually does the right thing and that's ptrace > and ELF core dumping. All other users are buggy. I do not argue that these cases need work, in fact I am aware of the direct-IO bit. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
| Last update: 2006-12-31 10:49 [from the cache] ©2003-2008 | |||||||||||||