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Diffstat (limited to 'Documentation/core-api/symbol-namespaces.rst')
| -rw-r--r-- | Documentation/core-api/symbol-namespaces.rst | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/Documentation/core-api/symbol-namespaces.rst b/Documentation/core-api/symbol-namespaces.rst index 27a9cccc792c..06f766a6aab2 100644 --- a/Documentation/core-api/symbol-namespaces.rst +++ b/Documentation/core-api/symbol-namespaces.rst @@ -41,9 +41,9 @@ entries. In addition to the macros EXPORT_SYMBOL() and EXPORT_SYMBOL_GPL(), that allow exporting of kernel symbols to the kernel symbol table, variants of these are available to export symbols into a certain namespace: EXPORT_SYMBOL_NS() and -EXPORT_SYMBOL_NS_GPL(). They take one additional argument: the namespace. -Please note that due to macro expansion that argument needs to be a -preprocessor symbol. E.g. to export the symbol ``usb_stor_suspend`` into the +EXPORT_SYMBOL_NS_GPL(). They take one additional argument: the namespace as a +string constant. Note that this string must not contain whitespaces. +E.g. to export the symbol ``usb_stor_suspend`` into the namespace ``USB_STORAGE``, use:: EXPORT_SYMBOL_NS(usb_stor_suspend, "USB_STORAGE"); @@ -78,11 +78,10 @@ as this argument has preference over a default symbol namespace. A second option to define the default namespace is directly in the compilation unit as preprocessor statement. The above example would then read:: - #undef DEFAULT_SYMBOL_NAMESPACE #define DEFAULT_SYMBOL_NAMESPACE "USB_COMMON" -within the corresponding compilation unit before any EXPORT_SYMBOL macro is -used. +within the corresponding compilation unit before the #include for +<linux/export.h>. Typically it's placed before the first #include statement. 3. How to use Symbols exported in Namespaces ============================================ |