[PATCH] kernel-doc: xforms: support __SYSFS_FUNCTION_ALTERNATIVE()

[Randy Dunlap]

Add support for __SYSFS_FUNCTION_ALTERNATIVE() to create a union of its
members (as though CONFIG_CFI is unset).

Fixes these docs build warnings:

WARNING: include/linux/device.h:117 Invalid param: __SYSFS_FUNCTION_ALTERNATIVE( ssize_t (*show)(struct device *dev, struct device_attribute *attr, char *buf)
WARNING: include/linux/device.h:117 struct member '__SYSFS_FUNCTION_ALTERNATIVE( ssize_t (*show' not described in 'device_attribute'
WARNING: include/linux/device.h:117 Invalid param: __SYSFS_FUNCTION_ALTERNATIVE( ssize_t (*store)(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
WARNING: include/linux/device.h:117 struct member '__SYSFS_FUNCTION_ALTERNATIVE( ssize_t (*store' not described in 'device_attribute'

Fixes: 434506b86a6c ("driver core: Allow the constification of device attributes")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
---
Cc: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Danilo Krummrich <dakr@xxxxxxxxxx>
Cc: driver-core@xxxxxxxxxxxxxxx
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Cc: linux-doc@xxxxxxxxxxxxxxx
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx

 tools/lib/python/kdoc/xforms_lists.py |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20260619.orig/tools/lib/python/kdoc/xforms_lists.py
+++ linux-next-20260619/tools/lib/python/kdoc/xforms_lists.py
@@ -49,6 +49,7 @@ class CTransforms:
         (CMatch("DEFINE_DMA_UNMAP_ADDR"), r"dma_addr_t \1"),
         (CMatch("DEFINE_DMA_UNMAP_LEN"), r"__u32 \1"),
         (CMatch("VIRTIO_DECLARE_FEATURES"), r"union { u64 \1; u64 \1_array[VIRTIO_FEATURES_U64S]; }"),
+        (CMatch("__SYSFS_FUNCTION_ALTERNATIVE"), r"union { \1+ }"),
         (CMatch("__attribute__"), ""),
 
         #