From: Benjamin Herrenschmidt Date: Sun, 27 May 2007 05:18:22 +0000 (+1000) Subject: [POWERPC] Fix possible access to free pages X-Git-Tag: v2.6.22-rc4~12^2~10 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6ad8d010b2f364b739020e514e61b6a73444464b;p=pandora-kernel.git [POWERPC] Fix possible access to free pages I think we have a subtle race on ppc64 with the tlb batching. The common code expects tlb_flush() to actually flush any pending TLB batch. It does that because it delays all page freeing until after tlb_flush() is called, in order to ensure no stale reference to those pages exist in any TLB, thus causing potential access to the freed pages. However, our tlb_flush only triggers the RCU for freeing page table pages, it does not currently trigger a flush of a pending TLB/hash batch, which is, I think, an error. This fixes it. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras --- Reading git-diff-tree failed