From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49189) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e4liY-0008Fk-CV for qemu-devel@nongnu.org; Wed, 18 Oct 2017 06:36:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e4liW-0005QT-Jl for qemu-devel@nongnu.org; Wed, 18 Oct 2017 06:36:54 -0400 Received: from mx1.redhat.com ([209.132.183.28]:34338) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1e4liW-0005Q8-DX for qemu-devel@nongnu.org; Wed, 18 Oct 2017 06:36:52 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7B1E2C04AC7C for ; Wed, 18 Oct 2017 10:36:51 +0000 (UTC) From: Juan Quintela Date: Wed, 18 Oct 2017 12:36:29 +0200 Message-Id: <20171018103633.5549-7-quintela@redhat.com> In-Reply-To: <20171018103633.5549-1-quintela@redhat.com> References: <20171018103633.5549-1-quintela@redhat.com> Subject: [Qemu-devel] [PATCH v2 06/10] migration: Make sure that we pass the right cache size List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: dgilbert@redhat.com, lvivier@redhat.com, peterx@redhat.com Instead of passing silently round down the number of pages, make it an error that the cache size is not a power of 2. Signed-off-by: Juan Quintela --- migration/page_cache.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/migration/page_cache.c b/migration/page_cache.c index 9a9d13d6a2..96268c3aea 100644 --- a/migration/page_cache.c +++ b/migration/page_cache.c @@ -58,6 +58,13 @@ PageCache *cache_init(int64_t new_size, size_t page_size, Error **errp) return NULL; } + /* round down to the nearest power of 2 */ + if (!is_power_of_2(num_pages)) { + error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", + "is not a power of two number of pages"); + return NULL; + } + /* We prefer not to abort if there is no memory */ cache = g_try_malloc(sizeof(*cache)); if (!cache) { @@ -65,11 +72,6 @@ PageCache *cache_init(int64_t new_size, size_t page_size, Error **errp) "Failed to allocate cache"); return NULL; } - /* round down to the nearest power of 2 */ - if (!is_power_of_2(num_pages)) { - num_pages = pow2floor(num_pages); - DPRINTF("rounding down to %" PRId64 "\n", num_pages); - } cache->page_size = page_size; cache->num_items = 0; cache->max_num_items = num_pages; -- 2.13.6