From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-x241.google.com (mail-pf0-x241.google.com [IPv6:2607:f8b0:400e:c00::241]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3rlh7G6jFdzDqyY for ; Fri, 8 Jul 2016 01:17:14 +1000 (AEST) Received: by mail-pf0-x241.google.com with SMTP id t190so2068510pfb.2 for ; Thu, 07 Jul 2016 08:17:14 -0700 (PDT) Subject: Re: [PATCH] Remove lots of IS_ERR_VALUE abuses. To: Arnd Bergmann , linuxppc-dev@lists.ozlabs.org References: <1467832663-5653-1-git-send-email-arvind.yadav.cs@gmail.com> <5371430.pWs0YMj39t@wuerfel> Cc: leoli@freescale.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org From: arvind Yadav Message-ID: <577E7275.4030503@gmail.com> Date: Thu, 7 Jul 2016 20:47:09 +0530 MIME-Version: 1.0 In-Reply-To: <5371430.pWs0YMj39t@wuerfel> Content-Type: text/plain; charset=windows-1252; format=flowed List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , As per your concern, I have change commit message. Submit other patch. Thanks, Arvind Yadav On Thursday 07 July 2016 01:40 PM, Arnd Bergmann wrote: > On Thursday, July 7, 2016 12:47:43 AM CEST Arvind Yadav wrote: >> Most users of IS_ERR_VALUE() in the kernel are wrong, as they >> pass an 'int' into a function that takes an 'unsigned long' >> argument. This happens to work because the type is sign-extended >> on 64-bit architectures before it gets converted into an >> unsigned type. >> >> However, anything that passes an 'unsigned short' or 'unsigned int' >> argument into IS_ERR_VALUE() is guaranteed to be broken, as are >> 8-bit integers and types that are wider than 'unsigned long'. >> >> Andrzej Hajda has already fixed a lot of the worst abusers that >> were causing actual bugs, but it would be nice to prevent any >> users that are not passing 'unsigned long' arguments. >> >> This patch changes all users of IS_ERR_VALUE() that I could find >> on 32-bit ARM randconfig builds and x86 allmodconfig. For the >> moment, this doesn't change the definition of IS_ERR_VALUE() >> because there are probably still architecture specific users >> elsewhere. >> >> Almost all the warnings I got are for files that are better off >> using 'if (err)' or 'if (err < 0)'. >> The only legitimate user I could find that we get a warning for >> is the (32-bit only) freescale gigabit ethernet driver. >> >> I was using this definition for testing: >> >> #define IS_ERR_VALUE(x) ((unsigned long*)NULL == (typeof (x)*)NULL && \ >> unlikely((unsigned long long)(x) >= (unsigned long long)(typeof(x))-MAX_ERRNO)) >> >> which ends up making all 16-bit or wider types work correctly with >> the most plausible interpretation of what IS_ERR_VALUE() was supposed >> to return according to its users, but also causes a compile-time >> warning for any users that do not pass an 'unsigned long' argument. >> >> Signed-off-by: Arvind Yadav > The above is my changelog text for commit 287980e49f, but it's not my patch. > > Your changes look fine, but reusing my description there seems wrong. > Can you add a new description and just point to my commit instead? > > Arnd > >> drivers/net/ethernet/freescale/ucc_geth.c | 30 +++++++++++++++--------------- >> 1 file changed, 15 insertions(+), 15 deletions(-) >> >> diff --git a/drivers/net/ethernet/freescale/ucc_geth.c b/drivers/net/ethernet/freescale/ucc_geth.c >> index 5bf1ade..c1ead2c 100644 >> --- a/drivers/net/ethernet/freescale/ucc_geth.c >> +++ b/drivers/net/ethernet/freescale/ucc_geth.c >> @@ -289,7 +289,7 @@ static int fill_init_enet_entries(struct ucc_geth_private *ugeth, >> else { >> init_enet_offset = >> qe_muram_alloc(thread_size, thread_alignment); >> - if (IS_ERR_VALUE(init_enet_offset)) { >> + if (init_enet_offset < 0) { >> if (netif_msg_ifup(ugeth)) >> pr_err("Can not allocate DPRAM memory\n"); >> qe_put_snum((u8) snum); >> @@ -2234,7 +2234,7 @@ static int ucc_geth_alloc_tx(struct ucc_geth_private *ugeth) >> ugeth->tx_bd_ring_offset[j] = >> qe_muram_alloc(length, >> UCC_GETH_TX_BD_RING_ALIGNMENT); >> - if (!IS_ERR_VALUE(ugeth->tx_bd_ring_offset[j])) >> + if (!ugeth->tx_bd_ring_offset[j]) >> ugeth->p_tx_bd_ring[j] = >> (u8 __iomem *) qe_muram_addr(ugeth-> >> tx_bd_ring_offset[j]); >> @@ -2311,7 +2311,7 @@ static int ucc_geth_alloc_rx(struct ucc_geth_private *ugeth) >> ugeth->rx_bd_ring_offset[j] = >> qe_muram_alloc(length, >> UCC_GETH_RX_BD_RING_ALIGNMENT); >> - if (!IS_ERR_VALUE(ugeth->rx_bd_ring_offset[j])) >> + if (!ugeth->rx_bd_ring_offset[j]) >> ugeth->p_rx_bd_ring[j] = >> (u8 __iomem *) qe_muram_addr(ugeth-> >> rx_bd_ring_offset[j]); >> @@ -2521,7 +2521,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth) >> ugeth->tx_glbl_pram_offset = >> qe_muram_alloc(sizeof(struct ucc_geth_tx_global_pram), >> UCC_GETH_TX_GLOBAL_PRAM_ALIGNMENT); >> - if (IS_ERR_VALUE(ugeth->tx_glbl_pram_offset)) { >> + if (ugeth->tx_glbl_pram_offset < 0) { >> if (netif_msg_ifup(ugeth)) >> pr_err("Can not allocate DPRAM memory for p_tx_glbl_pram\n"); >> return -ENOMEM; >> @@ -2541,7 +2541,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth) >> sizeof(struct ucc_geth_thread_data_tx) + >> 32 * (numThreadsTxNumerical == 1), >> UCC_GETH_THREAD_DATA_ALIGNMENT); >> - if (IS_ERR_VALUE(ugeth->thread_dat_tx_offset)) { >> + if (ugeth->thread_dat_tx_offset < 0) { >> if (netif_msg_ifup(ugeth)) >> pr_err("Can not allocate DPRAM memory for p_thread_data_tx\n"); >> return -ENOMEM; >> @@ -2568,7 +2568,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth) >> qe_muram_alloc(ug_info->numQueuesTx * >> sizeof(struct ucc_geth_send_queue_qd), >> UCC_GETH_SEND_QUEUE_QUEUE_DESCRIPTOR_ALIGNMENT); >> - if (IS_ERR_VALUE(ugeth->send_q_mem_reg_offset)) { >> + if (ugeth->send_q_mem_reg_offset < 0) { >> if (netif_msg_ifup(ugeth)) >> pr_err("Can not allocate DPRAM memory for p_send_q_mem_reg\n"); >> return -ENOMEM; >> @@ -2609,7 +2609,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth) >> ugeth->scheduler_offset = >> qe_muram_alloc(sizeof(struct ucc_geth_scheduler), >> UCC_GETH_SCHEDULER_ALIGNMENT); >> - if (IS_ERR_VALUE(ugeth->scheduler_offset)) { >> + if (ugeth->scheduler_offset < 0) { >> if (netif_msg_ifup(ugeth)) >> pr_err("Can not allocate DPRAM memory for p_scheduler\n"); >> return -ENOMEM; >> @@ -2656,7 +2656,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth) >> qe_muram_alloc(sizeof >> (struct ucc_geth_tx_firmware_statistics_pram), >> UCC_GETH_TX_STATISTICS_ALIGNMENT); >> - if (IS_ERR_VALUE(ugeth->tx_fw_statistics_pram_offset)) { >> + if (ugeth->tx_fw_statistics_pram_offset < 0) { >> if (netif_msg_ifup(ugeth)) >> pr_err("Can not allocate DPRAM memory for p_tx_fw_statistics_pram\n"); >> return -ENOMEM; >> @@ -2693,7 +2693,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth) >> ugeth->rx_glbl_pram_offset = >> qe_muram_alloc(sizeof(struct ucc_geth_rx_global_pram), >> UCC_GETH_RX_GLOBAL_PRAM_ALIGNMENT); >> - if (IS_ERR_VALUE(ugeth->rx_glbl_pram_offset)) { >> + if (ugeth->rx_glbl_pram_offset < 0) { >> if (netif_msg_ifup(ugeth)) >> pr_err("Can not allocate DPRAM memory for p_rx_glbl_pram\n"); >> return -ENOMEM; >> @@ -2712,7 +2712,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth) >> qe_muram_alloc(numThreadsRxNumerical * >> sizeof(struct ucc_geth_thread_data_rx), >> UCC_GETH_THREAD_DATA_ALIGNMENT); >> - if (IS_ERR_VALUE(ugeth->thread_dat_rx_offset)) { >> + if (ugeth->thread_dat_rx_offset < 0) { >> if (netif_msg_ifup(ugeth)) >> pr_err("Can not allocate DPRAM memory for p_thread_data_rx\n"); >> return -ENOMEM; >> @@ -2733,7 +2733,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth) >> qe_muram_alloc(sizeof >> (struct ucc_geth_rx_firmware_statistics_pram), >> UCC_GETH_RX_STATISTICS_ALIGNMENT); >> - if (IS_ERR_VALUE(ugeth->rx_fw_statistics_pram_offset)) { >> + if (ugeth->rx_fw_statistics_pram_offset < 0) { >> if (netif_msg_ifup(ugeth)) >> pr_err("Can not allocate DPRAM memory for p_rx_fw_statistics_pram\n"); >> return -ENOMEM; >> @@ -2753,7 +2753,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth) >> qe_muram_alloc(ug_info->numQueuesRx * >> sizeof(struct ucc_geth_rx_interrupt_coalescing_entry) >> + 4, UCC_GETH_RX_INTERRUPT_COALESCING_ALIGNMENT); >> - if (IS_ERR_VALUE(ugeth->rx_irq_coalescing_tbl_offset)) { >> + if (ugeth->rx_irq_coalescing_tbl_offset < 0) { >> if (netif_msg_ifup(ugeth)) >> pr_err("Can not allocate DPRAM memory for p_rx_irq_coalescing_tbl\n"); >> return -ENOMEM; >> @@ -2819,7 +2819,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth) >> (sizeof(struct ucc_geth_rx_bd_queues_entry) + >> sizeof(struct ucc_geth_rx_prefetched_bds)), >> UCC_GETH_RX_BD_QUEUES_ALIGNMENT); >> - if (IS_ERR_VALUE(ugeth->rx_bd_qs_tbl_offset)) { >> + if (ugeth->rx_bd_qs_tbl_offset < 0) { >> if (netif_msg_ifup(ugeth)) >> pr_err("Can not allocate DPRAM memory for p_rx_bd_qs_tbl\n"); >> return -ENOMEM; >> @@ -2905,7 +2905,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth) >> ugeth->exf_glbl_param_offset = >> qe_muram_alloc(sizeof(struct ucc_geth_exf_global_pram), >> UCC_GETH_RX_EXTENDED_FILTERING_GLOBAL_PARAMETERS_ALIGNMENT); >> - if (IS_ERR_VALUE(ugeth->exf_glbl_param_offset)) { >> + if (ugeth->exf_glbl_param_offset < 0) { >> if (netif_msg_ifup(ugeth)) >> pr_err("Can not allocate DPRAM memory for p_exf_glbl_param\n"); >> return -ENOMEM; >> @@ -3039,7 +3039,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth) >> >> /* Allocate InitEnet command parameter structure */ >> init_enet_pram_offset = qe_muram_alloc(sizeof(struct ucc_geth_init_pram), 4); >> - if (IS_ERR_VALUE(init_enet_pram_offset)) { >> + if (init_enet_pram_offset < 0) { >> if (netif_msg_ifup(ugeth)) >> pr_err("Can not allocate DPRAM memory for p_init_enet_pram\n"); >> return -ENOMEM; >> >