On Mon, 18 Sep 2023 12:30:58 +0200, Rafael J. Wysocki wrote:

On Thu, Sep 14, 2023 at 11:32 PM Jinhui Guo guojinhui.liam@bytedance.com wrote:

...

platform_add_device()

According to "git grep" this function is not present in 6.6-rc2.

If you mean platform_device_add(), please update the patch subject and changelog accordingly.

This is my mistake, the function name was written wrong. I will fix it in the next patch.

...

creates the numa_node attribute of sysfs according to whether dev_to_node(dev) is equal to NUMA_NO_NODE. So set the numa node of device before creating numa_node attribute of sysfs.

It would be good to also say that this needs to be done in platform_device_register_full(), because that's where the platform device object is allocated.

Thaks for your suggestion. I will modify my decription soon.

However, what about adding the NUMA node information to pdevinfo? It would be more straightforward to handle it then AFAICS.

I have tried three potential solutions to fix the bug: 1. The first one is what the current patch do.

2. Add a new function interface only for acpi_create_platform_device() call. But the code will be a bit redundant.

3. Add an member "numa_node" in `struct platform_device_info`, just as what `struct device` done:

``` struct platform_device_info { ...; #ifdef CONFIG_NUMA int numa_node; #endif ```

But not all the call to platform_device_register_full() would set numa_node, and many of them use ` memset(&pdevinfo, 0, sizeof(pdevinfo));` to initialize `struct platform_device_info`. It could initialize numa_node to zero and result in wrong numa_node information in sysfs.

``` struct platform_device *platform_device_register_full( const struct platform_device_info *pdevinfo) { ...; /* * (1) It will initialize numa_node in `struct device` to NUMA_NO_NODE. * NUMA_NO_NODE is -1. */ pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); ...; /* * (2) If we add set_dev_node() here, we have to make sure pdevinfo->numa_node * is correct. But It is difficult to do so, especially drivers don't want to * set numa_node. Instead of initializing pdevinfo->numa_node to NUMA_NO_NODE, * they are accustomed to memset `struct platform_device_info` to be zero. */ set_dev_node(&pdev->dev, pdevinfo->numa_node); ...; /* * (3) The sysfs attribute numa_node will create here. */ ret = platform_device_add(pdev); ...; } ```

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Fixes: 4a60406d3592 ("driver core: platform: expose numa_node to users in sysfs") Cc: stable@vger.kernel.org Reported-by: kernel test robot lkp@intel.com Closes: https://lore.kernel.org/oe-kbuild-all/202309122309.mbxAnAIe-lkp@intel.com/ Signed-off-by: Jinhui Guo guojinhui.liam@bytedance.com

---

V4 -> V5: Add Cc: stable line and changes from the previous submited patches V3 -> V4: Refactor code to be an ACPI function call V2 -> V3: Fix Signed-off name V1 -> V2: Fix compile error without enabling CONFIG_ACPI

drivers/acpi/acpi_platform.c | 4 +--- drivers/base/platform.c | 1 + include/linux/acpi.h | 5 +++++ 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c index 48d15dd785f6..adcbfbdc343f 100644 --- a/drivers/acpi/acpi_platform.c +++ b/drivers/acpi/acpi_platform.c @@ -178,11 +178,9 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev, if (IS_ERR(pdev)) dev_err(&adev->dev, "platform device creation failed: %ld\n", PTR_ERR(pdev));

•   else {
  

•           set_dev_node(&pdev->dev, acpi_get_node(adev->handle));
  

•   else
            dev_dbg(&adev->dev, "created platform device %s\n",
                    dev_name(&pdev->dev));
  

•   }
  
    kfree(resources);
  
  

diff --git a/drivers/base/platform.c b/drivers/base/platform.c index 76bfcba25003..35c891075d95 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -841,6 +841,7 @@ struct platform_device *platform_device_register_full( goto err; }

•   set_dev_node(&pdev->dev, ACPI_NODE_GET(ACPI_COMPANION(&pdev->dev)));
    ret = platform_device_add(pdev);
    if (ret) {
  

err: diff --git a/include/linux/acpi.h b/include/linux/acpi.h index a73246c3c35e..6a349d53f19e 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -477,6 +477,10 @@ static inline int acpi_get_node(acpi_handle handle) return 0; } #endif

+#define ACPI_NODE_GET(adev) ((adev) && (adev)->handle ? \

•   acpi_get_node((adev)->handle) : NUMA_NO_NODE)
  

extern int pnpacpi_disabled;

#define PXM_INVAL (-1) @@ -770,6 +774,7 @@ const char *acpi_get_subsystem_id(acpi_handle handle); #define ACPI_COMPANION_SET(dev, adev) do { } while (0) #define ACPI_HANDLE(dev) (NULL) #define ACPI_HANDLE_FWNODE(fwnode) (NULL) +#define ACPI_NODE_GET(adev) NUMA_NO_NODE

#include <acpi/acpi_numa.h>

-- 2.20.1

Thanks,

Jinhui Guo