From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen References: <20080317258.659191058@firstfloor.org> In-Reply-To: <20080317258.659191058@firstfloor.org> Subject: [PATCH] [11/18] Fix alignment bug in bootmem allocator Message-Id: <20080317015825.0C0171B41E0@basil.firstfloor.org> Date: Mon, 17 Mar 2008 02:58:25 +0100 (CET) Sender: owner-linux-mm@kvack.org Return-Path: To: linux-kernel@vger.kernel.org, pj@sgi.com, linux-mm@kvack.org, nickpiggin@yahoo.com.au List-ID: Without this fix bootmem can return unaligned addresses when the start of a node is not aligned to the align value. Needed for reliably allocating gigabyte pages. Signed-off-by: Andi Kleen --- mm/bootmem.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) Index: linux/mm/bootmem.c =================================================================== --- linux.orig/mm/bootmem.c +++ linux/mm/bootmem.c @@ -197,6 +197,7 @@ __alloc_bootmem_core(struct bootmem_data { unsigned long offset, remaining_size, areasize, preferred; unsigned long i, start = 0, incr, eidx, end_pfn; + unsigned long pfn; void *ret; if (!size) { @@ -239,12 +240,13 @@ __alloc_bootmem_core(struct bootmem_data preferred = PFN_DOWN(ALIGN(preferred, align)) + offset; areasize = (size + PAGE_SIZE-1) / PAGE_SIZE; incr = align >> PAGE_SHIFT ? : 1; + pfn = PFN_DOWN(bdata->node_boot_start); restart_scan: for (i = preferred; i < eidx; i += incr) { unsigned long j; i = find_next_zero_bit(bdata->node_bootmem_map, eidx, i); - i = ALIGN(i, incr); + i = ALIGN(pfn + i, incr) - pfn; if (i >= eidx) break; if (test_bit(i, bdata->node_bootmem_map)) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org