linux-kernel - Re: [PATCH 23/36] driver core: bus: mark the struct bus

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Date:   Mon, 13 Mar 2023 14:14:47 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, rafael@...nel.org,
        "David S. Miller" <davem@...emloft.net>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Alex Shi <alexs@...nel.org>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Alexandre Bounine <alex.bou9@...il.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dexuan Cui <decui@...rosoft.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Hannes Reinecke <hare@...e.de>,
        Harald Freudenberger <freude@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Hu Haowen <src.res@...il.cn>,
        Ilya Dryomov <idryomov@...il.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Iwona Winiarska <iwona.winiarska@...el.com>,
        Jakub Kicinski <kuba@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Jonathan Corbet <corbet@....net>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Matt Porter <mporter@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paolo Abeni <pabeni@...hat.com>,
        Stuart Yoder <stuyoder@...il.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Wei Liu <wei.liu@...nel.org>,
        Yanteng Si <siyanteng@...ngson.cn>
Subject: Re: [PATCH 23/36] driver core: bus: mark the struct bus_type for
 sysfs callbacks as constant

On Mon, Mar 13, 2023 at 07:29:05PM +0100, Greg Kroah-Hartman wrote:
> struct bus_type should never be modified in a sysfs callback as there is
> nothing in the structure to modify, and frankly, the structure is almost
> never used in a sysfs callback, so mark it as constant to allow struct
> bus_type to be moved to read-only memory.
> 
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
> Cc: "K. Y. Srinivasan" <kys@...rosoft.com>
> Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
> Cc: Alex Shi <alexs@...nel.org>
> Cc: Alexander Gordeev <agordeev@...ux.ibm.com>
> Cc: Alexandre Bounine <alex.bou9@...il.com>
> Cc: Alison Schofield <alison.schofield@...el.com>
> Cc: Ben Widawsky <bwidawsk@...nel.org>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Dexuan Cui <decui@...rosoft.com>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Haiyang Zhang <haiyangz@...rosoft.com>
> Cc: Hannes Reinecke <hare@...e.de>
> Cc: Harald Freudenberger <freude@...ux.ibm.com>
> Cc: Heiko Carstens <hca@...ux.ibm.com>
> Cc: Hu Haowen <src.res@...il.cn>
> Cc: Ilya Dryomov <idryomov@...il.com>
> Cc: Ira Weiny <ira.weiny@...el.com>
> Cc: Iwona Winiarska <iwona.winiarska@...el.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Laurentiu Tudor <laurentiu.tudor@....com>
> Cc: Matt Porter <mporter@...nel.crashing.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: Stuart Yoder <stuyoder@...il.com>
> Cc: Vasily Gorbik <gor@...ux.ibm.com>
> Cc: Vishal Verma <vishal.l.verma@...el.com>
> Cc: Wei Liu <wei.liu@...nel.org>
> Cc: Yanteng Si <siyanteng@...ngson.cn>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>	# pci

> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index dd0d9d9bc509..ab32a91f287b 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -428,7 +428,7 @@ static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
>  }
>  static DEVICE_ATTR_RW(msi_bus);
>  
> -static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count)
> +static ssize_t rescan_store(const struct bus_type *bus, const char *buf, size_t count)
>  {
>  	unsigned long val;
>  	struct pci_bus *b = NULL;
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 7a67611dc5f4..45c3bb039f21 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -6679,7 +6679,7 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev)
>  	}
>  }
>  
> -static ssize_t resource_alignment_show(struct bus_type *bus, char *buf)
> +static ssize_t resource_alignment_show(const struct bus_type *bus, char *buf)
>  {
>  	size_t count = 0;
>  
> @@ -6691,7 +6691,7 @@ static ssize_t resource_alignment_show(struct bus_type *bus, char *buf)
>  	return count;
>  }
>  
> -static ssize_t resource_alignment_store(struct bus_type *bus,
> +static ssize_t resource_alignment_store(const struct bus_type *bus,
>  					const char *buf, size_t count)
>  {
>  	char *param, *old, *end;