The patch titled mm: handle initialising compound pages at orders greater than MAX_ORDER has been removed from the -mm tree. Its filename was mm-handle-initialising-compound-pages-at-orders-greater-than-max_order.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: mm: handle initialising compound pages at orders greater than MAX_ORDER From: Andy Whitcroft <apw@xxxxxxxxxxxx> When we initialise a compound page we initialise the page flags and head page pointer for all base pages spanned by that page. When we initialise a gigantic page (a page of order greater than or equal to MAX_ORDER) we have to initialise more than MAX_ORDER_NR_PAGES pages. Currently we assume that all elements of the mem_map in this page are contigious in memory. However this is only guarenteed out to MAX_ORDER_NR_PAGES pages, and with SPARSEMEM enabled they will not be contigious. This leads us to walk off the end of the first section and scribble on everything which follows, BAD. When we reach a MAX_ORDER_NR_PAGES boundary we much locate the next section of the mem_map. As gigantic pages can only be maximally aligned we know this will occur at exact multiple of MAX_ORDER_NR_PAGES pages from the start of the page. This is a bug fix for the gigantic page support in hugetlbfs. Credit to Mel Gorman for spotting the issue. Signed-off-by: Andy Whitcroft <apw@xxxxxxxxxxxx> Cc: Mel Gorman <mel@xxxxxxxxx> Cc: Jon Tollefson <kniht@xxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/page_alloc.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff -puN mm/page_alloc.c~mm-handle-initialising-compound-pages-at-orders-greater-than-max_order mm/page_alloc.c --- a/mm/page_alloc.c~mm-handle-initialising-compound-pages-at-orders-greater-than-max_order +++ a/mm/page_alloc.c @@ -268,13 +268,14 @@ void prep_compound_page(struct page *pag { int i; int nr_pages = 1 << order; + struct page *p = page + 1; set_compound_page_dtor(page, free_compound_page); set_compound_order(page, order); __SetPageHead(page); - for (i = 1; i < nr_pages; i++) { - struct page *p = page + i; - + for (i = 1; i < nr_pages; i++, p++) { + if (unlikely((i & (MAX_ORDER_NR_PAGES - 1)) == 0)) + p = pfn_to_page(page_to_pfn(page) + i); __SetPageTail(p); p->first_page = page; } @@ -284,6 +285,7 @@ static void destroy_compound_page(struct { int i; int nr_pages = 1 << order; + struct page *p = page + 1; if (unlikely(compound_order(page) != order)) bad_page(page); @@ -291,8 +293,9 @@ static void destroy_compound_page(struct if (unlikely(!PageHead(page))) bad_page(page); __ClearPageHead(page); - for (i = 1; i < nr_pages; i++) { - struct page *p = page + i; + for (i = 1; i < nr_pages; i++, p++) { + if (unlikely((i & (MAX_ORDER_NR_PAGES - 1)) == 0)) + p = pfn_to_page(page_to_pfn(page) + i); if (unlikely(!PageTail(p) | (p->first_page != page))) _ Patches currently in -mm which might be from apw@xxxxxxxxxxxx are origin.patch mm-hugetlbc-make-functions-static-use-null-rather-than-0.patch checkpatch-square-brackets-exemption-for-array-slices-in-braces.patch checkpatch-values-double-ampersand-may-be-unary.patch checkpatch-conditional-indent-labels-have-different-indent-rules.patch checkpatch-switch-indent-allow-plain-return.patch checkpatch-add-tests-for-the-attribute-matcher.patch checkpatch-____cacheline_aligned-et-al-are-modifiers.patch checkpatch-complex-macros-fix-up-extension-handling.patch checkpatch-fix-up-comment-checks-search-to-scan-the-entire-block.patch checkpatch-include-asm-checks-should-be-anchored.patch checkpatch-reduce-warnings-for-include-of-asm-fooh-to-check-from-arch-barc.patch checkpatch-report-any-absolute-references-to-kernel-source-files.patch checkpatch-report-the-real-first-line-of-all-suspect-indents.patch checkpatch-suspect-indent-skip-over-preprocessor-label-and-blank-lines.patch checkpatch-%lx-tests-should-hand-%%-as-a-literal.patch checkpatch-report-the-correct-lines-for-single-statement-blocks.patch checkpatch-perform-indent-checks-on-perl.patch checkpatch-version-022.patch checkpatch-case-default-checks-should-only-check-changed-lines.patch checkpatch-suppress-errors-triggered-by-short-patch.patch checkpatch-handle-comment-quote-nesting-correctly.patch checkpatch-check-line-endings-in-text-format-files.patch checkpatch-suspect-indent-count-condition-lines-correctly.patch checkpatch-ensure-we-only-apply-checks-to-the-lines-within-hunks.patch checkpatch-version-023.patch page-owner-tracking-leak-detector.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