From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-f70.google.com (mail-it0-f70.google.com [209.85.214.70]) by kanga.kvack.org (Postfix) with ESMTP id 887FF6B02E4 for ; Wed, 16 Nov 2016 17:25:56 -0500 (EST) Received: by mail-it0-f70.google.com with SMTP id q186so74089591itb.0 for ; Wed, 16 Nov 2016 14:25:56 -0800 (PST) Received: from p3plsmtps2ded02.prod.phx3.secureserver.net (p3plsmtps2ded02.prod.phx3.secureserver.net. [208.109.80.59]) by mx.google.com with ESMTPS id n187si6747987itn.35.2016.11.16.14.24.04 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 16 Nov 2016 14:24:05 -0800 (PST) From: Matthew Wilcox Subject: [PATCH 16/29] radix-tree: Make radix_tree_find_next_bit more useful Date: Wed, 16 Nov 2016 16:17:19 -0800 Message-Id: <1479341856-30320-55-git-send-email-mawilcox@linuxonhyperv.com> In-Reply-To: <1479341856-30320-1-git-send-email-mawilcox@linuxonhyperv.com> References: <1479341856-30320-1-git-send-email-mawilcox@linuxonhyperv.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel@vger.kernel.org, Andrew Morton , Konstantin Khlebnikov , Ross Zwisler Cc: linux-fsdevel@vger.kernel.org, Matthew Wilcox , linux-mm@kvack.org, "Kirill A . Shutemov" , Matthew Wilcox From: Matthew Wilcox Since this function is specialised to the radix tree, pass in the node and tag to calculate the address of the bitmap in radix_tree_find_next_bit() instead of the caller. Likewise, there is no need to pass in the size of the bitmap. Signed-off-by: Matthew Wilcox --- lib/radix-tree.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/lib/radix-tree.c b/lib/radix-tree.c index bf1303f..2c3fac4 100644 --- a/lib/radix-tree.c +++ b/lib/radix-tree.c @@ -191,13 +191,12 @@ static inline int any_tag_set(struct radix_tree_node *node, unsigned int tag) * Returns next bit offset, or size if nothing found. */ static __always_inline unsigned long -radix_tree_find_next_bit(const unsigned long *addr, - unsigned long size, unsigned long offset) +radix_tree_find_next_bit(struct radix_tree_node *node, unsigned int tag, + unsigned long offset) { - if (!__builtin_constant_p(size)) - return find_next_bit(addr, size, offset); + const unsigned long *addr = node->tags[tag]; - if (offset < size) { + if (offset < RADIX_TREE_MAP_SIZE) { unsigned long tmp; addr += offset / BITS_PER_LONG; @@ -205,14 +204,14 @@ radix_tree_find_next_bit(const unsigned long *addr, if (tmp) return __ffs(tmp) + offset; offset = (offset + BITS_PER_LONG) & ~(BITS_PER_LONG - 1); - while (offset < size) { + while (offset < RADIX_TREE_MAP_SIZE) { tmp = *++addr; if (tmp) return __ffs(tmp) + offset; offset += BITS_PER_LONG; } } - return size; + return RADIX_TREE_MAP_SIZE; } #ifndef __KERNEL__ @@ -1197,9 +1196,7 @@ void **radix_tree_next_chunk(struct radix_tree_root *root, return NULL; if (flags & RADIX_TREE_ITER_TAGGED) - offset = radix_tree_find_next_bit( - node->tags[tag], - RADIX_TREE_MAP_SIZE, + offset = radix_tree_find_next_bit(node, tag, offset + 1); else while (++offset < RADIX_TREE_MAP_SIZE) { -- 2.10.2 -- 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