The patch titled kpagecount: add slab page checking because _mapcount is in a union has been added to the -mm tree. Its filename is kpagecount-added-slab-page-checking-because-of-_mapcount-in-union.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: kpagecount: add slab page checking because _mapcount is in a union From: Petr Holasek <pholasek@xxxxxxxxxx> Add a PageSlab() check before adding the _mapcount value to /kpagecount. page->_mapcount is in a union with the SLAB structure so for pages controlled by SLAB, page_mapcount() returns nonsense. Signed-off-by: Petr Holasek <pholasek@xxxxxxxxxx> Cc: Wu Fengguang <fengguang.wu@xxxxxxxxx> Cc: Matt Mackall <mpm@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/proc/page.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN fs/proc/page.c~kpagecount-added-slab-page-checking-because-of-_mapcount-in-union fs/proc/page.c --- a/fs/proc/page.c~kpagecount-added-slab-page-checking-because-of-_mapcount-in-union +++ a/fs/proc/page.c @@ -40,7 +40,7 @@ static ssize_t kpagecount_read(struct fi ppage = pfn_to_page(pfn); else ppage = NULL; - if (!ppage) + if (!ppage || PageSlab(ppage)) pcount = 0; else pcount = page_mapcount(ppage); _ Patches currently in -mm which might be from pholasek@xxxxxxxxxx are kpagecount-added-slab-page-checking-because-of-_mapcount-in-union.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html