From: Dave Jiang <dave.jiang@intel.com>
To: "Peng Fan (OSS)" <peng.fan@oss.nxp.com>,
Vinicius Costa Gomes <vinicius.gomes@intel.com>,
Vinod Koul <vkoul@kernel.org>, Frank Li <Frank.Li@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>, Peng Fan <peng.fan@nxp.com>,
Kees Cook <kees@kernel.org>
Cc: linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org,
imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] dmaengine: use assign_bit() where applicable
Date: Fri, 18 Sep 2026 07:37:41 -0700 [thread overview]
Message-ID: <8616f55f-9703-42d3-8d3e-7fdfb6a8a5ff@intel.com> (raw)
In-Reply-To: <20260918141622.3022876-1-peng.fan@oss.nxp.com>
On 9/18/26 7:16 AM, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
>
> Convert open-coded if/else with set_bit/clear_bit and their
> non-atomic __set_bit/__clear_bit variants to the assign_bit/__assign_bit
> API.
>
> Done with Coccinelle semantic patch.
>
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
> ---
> drivers/dma/idxd/sysfs.c | 5 +----
> drivers/dma/imx-sdma.c | 15 +++------------
> drivers/dma/ppc4xx/adma.c | 29 +++++++++--------------------
> 3 files changed, 13 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
> index 6d251095c350..2b0524324089 100644
> --- a/drivers/dma/idxd/sysfs.c
> +++ b/drivers/dma/idxd/sysfs.c
> @@ -1095,10 +1095,7 @@ static ssize_t wq_ats_disable_store(struct device *dev, struct device_attribute
> if (rc < 0)
> return rc;
>
> - if (ats_dis)
> - set_bit(WQ_FLAG_ATS_DISABLE, &wq->flags);
> - else
> - clear_bit(WQ_FLAG_ATS_DISABLE, &wq->flags);
> + assign_bit(WQ_FLAG_ATS_DISABLE, &wq->flags, ats_dis);
>
> return count;
> }
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
> index 36368835a845..b8a91a0343b5 100644
> --- a/drivers/dma/imx-sdma.c
> +++ b/drivers/dma/imx-sdma.c
> @@ -710,20 +710,11 @@ static int sdma_config_ownership(struct sdma_channel *sdmac,
> mcu = readl_relaxed(sdma->regs + SDMA_H_HOSTOVR);
> dsp = readl_relaxed(sdma->regs + SDMA_H_DSPOVR);
>
> - if (dsp_override)
> - __clear_bit(channel, &dsp);
> - else
> - __set_bit(channel, &dsp);
> + __assign_bit(channel, &dsp, !dsp_override);
>
> - if (event_override)
> - __clear_bit(channel, &evt);
> - else
> - __set_bit(channel, &evt);
> + __assign_bit(channel, &evt, !event_override);
>
> - if (mcu_override)
> - __clear_bit(channel, &mcu);
> - else
> - __set_bit(channel, &mcu);
> + __assign_bit(channel, &mcu, !mcu_override);
>
> writel_relaxed(evt, sdma->regs + SDMA_H_EVTOVR);
> writel_relaxed(mcu, sdma->regs + SDMA_H_HOSTOVR);
> diff --git a/drivers/dma/ppc4xx/adma.c b/drivers/dma/ppc4xx/adma.c
> index 279a431ccae3..39b1c4fd9ca5 100644
> --- a/drivers/dma/ppc4xx/adma.c
> +++ b/drivers/dma/ppc4xx/adma.c
> @@ -350,10 +350,8 @@ static void ppc440spe_desc_init_dma01pq(struct ppc440spe_adma_desc_slot *desc,
> * of the transaction (src, dst, ...)
> */
> iter->hw_next = NULL;
> - if (flags & DMA_PREP_INTERRUPT)
> - set_bit(PPC440SPE_DESC_INT, &iter->flags);
> - else
> - clear_bit(PPC440SPE_DESC_INT, &iter->flags);
> + assign_bit(PPC440SPE_DESC_INT, &iter->flags,
> + flags & DMA_PREP_INTERRUPT);
> }
> }
>
> @@ -508,10 +506,7 @@ static void ppc440spe_desc_init_memcpy(struct ppc440spe_adma_desc_slot *desc,
> desc->src_cnt = 1;
> desc->dst_cnt = 1;
>
> - if (flags & DMA_PREP_INTERRUPT)
> - set_bit(PPC440SPE_DESC_INT, &desc->flags);
> - else
> - clear_bit(PPC440SPE_DESC_INT, &desc->flags);
> + assign_bit(PPC440SPE_DESC_INT, &desc->flags, flags & DMA_PREP_INTERRUPT);
>
> hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
> }
> @@ -2136,10 +2131,8 @@ static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_mult(
> chain_node);
> memset(iter->hw_desc, 0, sizeof(struct dma_cdb));
> iter->hw_next = NULL;
> - if (flags & DMA_PREP_INTERRUPT)
> - set_bit(PPC440SPE_DESC_INT, &iter->flags);
> - else
> - clear_bit(PPC440SPE_DESC_INT, &iter->flags);
> + assign_bit(PPC440SPE_DESC_INT, &iter->flags,
> + flags & DMA_PREP_INTERRUPT);
>
> hw_desc = iter->hw_desc;
> hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
> @@ -2221,10 +2214,8 @@ static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_sum_product(
> iter->hw_next = list_entry(iter->chain_node.next,
> struct ppc440spe_adma_desc_slot,
> chain_node);
> - if (flags & DMA_PREP_INTERRUPT)
> - set_bit(PPC440SPE_DESC_INT, &iter->flags);
> - else
> - clear_bit(PPC440SPE_DESC_INT, &iter->flags);
> + assign_bit(PPC440SPE_DESC_INT, &iter->flags,
> + flags & DMA_PREP_INTERRUPT);
>
> hw_desc = iter->hw_desc;
> hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
> @@ -2246,10 +2237,8 @@ static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_sum_product(
> chain_node);
> memset(iter->hw_desc, 0, sizeof(struct dma_cdb));
> iter->hw_next = NULL;
> - if (flags & DMA_PREP_INTERRUPT)
> - set_bit(PPC440SPE_DESC_INT, &iter->flags);
> - else
> - clear_bit(PPC440SPE_DESC_INT, &iter->flags);
> + assign_bit(PPC440SPE_DESC_INT, &iter->flags,
> + flags & DMA_PREP_INTERRUPT);
>
> hw_desc = iter->hw_desc;
> hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
prev parent reply other threads:[~2026-09-18 14:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-18 14:16 Peng Fan (OSS)
2026-09-18 14:37 ` Dave Jiang [this message]
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