[{"id":3680577,"web_url":"http://patchwork.ozlabs.org/comment/3680577/","msgid":"","list_archive_url":null,"date":"2026-04-22T12:02:22","subject":"Re: [ovs-dev] [PATCH ovn] lib: Fix dynamic_bitmap_last_set() on\n 32-bit architectures.","submitter":{"id":83634,"url":"http://patchwork.ozlabs.org/api/people/83634/","name":"Ales Musil","email":"amusil@redhat.com"},"content":"On Wed, Apr 22, 2026 at 2:00 PM Dumitru Ceara wrote:\n\n> raw_clz64() always operates on uint64_t, so it counts leading zeros\n> from bit 63. The original expression used (BITMAP_ULONG_BITS - 1)\n> which is 31 on 32-bit architectures where unsigned long is 32 bits.\n> When a 32-bit value is implicitly promoted to uint64_t, raw_clz64()\n> returns a value 32 higher than expected, making the subtraction\n> produce incorrect (negative) results.\n>\n> Use the constant 63 to match raw_clz64()'s 64-bit input width.\n>\n> Fixes: 39eb5b573388 (\"Add sparse array.\")\n> Assisted-by: Claude, with model: claude-opus-4-6\n> Signed-off-by: Dumitru Ceara \n> ---\n> NOTE: 32-bit OVN deployments are unlikely to exist in the wild, but\n> this fix ensures correctness in case someone attempts to build OVN\n> for a 32-bit target.\n> ---\n> lib/ovn-util.h | 4 ++--\n> 1 file changed, 2 insertions(+), 2 deletions(-)\n>\n> diff --git a/lib/ovn-util.h b/lib/ovn-util.h\n> index bcb344de44..b44c9c770a 100644\n> --- a/lib/ovn-util.h\n> +++ b/lib/ovn-util.h\n> @@ -549,8 +549,8 @@ dynamic_bitmap_last_set(const struct dynamic_bitmap\n> *db)\n> continue;\n> }\n>\n> - return (BITMAP_ULONG_BITS - 1) - raw_clz64(db->map[i])\n> - + (BITMAP_ULONG_BITS * i);\n> + /* raw_clz64() operates on values promoted to uint64_t (64-bit).\n> */\n> + return 63 - raw_clz64(db->map[i]) + (BITMAP_ULONG_BITS * i);\n> }\n>\n> return -1;\n> --\n> 2.53.0\n>\n>\nLooks good to me, thanks.\nAcked-by: Ales Musil ","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ovs-dev@openvswitch.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ovs-dev@lists.linuxfoundation.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=A495YJSy;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=openvswitch.org\n (client-ip=2605:bc80:3010::138; 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Wed, 22 Apr 2026\n 05:02:33 -0700 (PDT)"],"MIME-Version":"1.0","References":"<20260422120003.445795-1-dceara@redhat.com>","In-Reply-To":"<20260422120003.445795-1-dceara@redhat.com>","Date":"Wed, 22 Apr 2026 14:02:22 +0200","X-Gm-Features":"AQROBzDCvj9_46e4hGspsHCYm3huhRi07aOytdnS1eZPCq6g22e9VdT8m5MkpHI","Message-ID":"\n ","To":"Dumitru Ceara ","X-Mimecast-Spam-Score":"0","X-Mimecast-MFC-PROC-ID":"Of0pB2nlZbSlES3dLIW9TpxGXPdxuA7Uw8iyZotaGzA_1776859354","X-Mimecast-Originator":"redhat.com","X-Content-Filtered-By":"Mailman/MimeDel 2.1.30","Subject":"Re: [ovs-dev] [PATCH ovn] lib: Fix dynamic_bitmap_last_set() on\n 32-bit architectures.","X-BeenThere":"ovs-dev@openvswitch.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","From":"Ales Musil via dev ","Reply-To":"Ales Musil ","Cc":"ovs-dev@openvswitch.org","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"ovs-dev-bounces@openvswitch.org","Sender":"\"dev\" "}},{"id":3680597,"web_url":"http://patchwork.ozlabs.org/comment/3680597/","msgid":"<6391355d-5937-4a07-901c-143ae0f4f56b@redhat.com>","list_archive_url":null,"date":"2026-04-22T12:42:34","subject":"Re: [ovs-dev] [PATCH ovn] lib: Fix dynamic_bitmap_last_set() on\n 32-bit architectures.","submitter":{"id":76591,"url":"http://patchwork.ozlabs.org/api/people/76591/","name":"Dumitru Ceara","email":"dceara@redhat.com"},"content":"On 4/22/26 2:02 PM, Ales Musil wrote:\n> On Wed, Apr 22, 2026 at 2:00 PM Dumitru Ceara wrote:\n> \n>> raw_clz64() always operates on uint64_t, so it counts leading zeros\n>> from bit 63. The original expression used (BITMAP_ULONG_BITS - 1)\n>> which is 31 on 32-bit architectures where unsigned long is 32 bits.\n>> When a 32-bit value is implicitly promoted to uint64_t, raw_clz64()\n>> returns a value 32 higher than expected, making the subtraction\n>> produce incorrect (negative) results.\n>>\n>> Use the constant 63 to match raw_clz64()'s 64-bit input width.\n>>\n>> Fixes: 39eb5b573388 (\"Add sparse array.\")\n>> Assisted-by: Claude, with model: claude-opus-4-6\n>> Signed-off-by: Dumitru Ceara \n>> ---\n>> NOTE: 32-bit OVN deployments are unlikely to exist in the wild, but\n>> this fix ensures correctness in case someone attempts to build OVN\n>> for a 32-bit target.\n>> ---\n>> lib/ovn-util.h | 4 ++--\n>> 1 file changed, 2 insertions(+), 2 deletions(-)\n>>\n>> diff --git a/lib/ovn-util.h b/lib/ovn-util.h\n>> index bcb344de44..b44c9c770a 100644\n>> --- a/lib/ovn-util.h\n>> +++ b/lib/ovn-util.h\n>> @@ -549,8 +549,8 @@ dynamic_bitmap_last_set(const struct dynamic_bitmap\n>> *db)\n>> continue;\n>> }\n>>\n>> - return (BITMAP_ULONG_BITS - 1) - raw_clz64(db->map[i])\n>> - + (BITMAP_ULONG_BITS * i);\n>> + /* raw_clz64() operates on values promoted to uint64_t (64-bit).\n>> */\n>> + return 63 - raw_clz64(db->map[i]) + (BITMAP_ULONG_BITS * i);\n>> }\n>>\n>> return -1;\n>> --\n>> 2.53.0\n>>\n>>\n> Looks good to me, thanks.\n> Acked-by: Ales Musil \n> \n\nHi Ales,\n\nThanks for the review! Applied to main and 26.03.\n\nRegards,\nDumitru","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ovs-dev@openvswitch.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ovs-dev@lists.linuxfoundation.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=GBOgFd3n;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=openvswitch.org\n (client-ip=2605:bc80:3010::137; helo=smtp4.osuosl.org;\n envelope-from=ovs-dev-bounces@openvswitch.org; receiver=patchwork.ozlabs.org)","smtp4.osuosl.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key)\n header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=GBOgFd3n","smtp1.osuosl.org; dmarc=pass (p=quarantine dis=none)\n header.from=redhat.com","smtp1.osuosl.org; 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