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Change the header file which defines sys_delete_module

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Jim Huang 2021-08-09 22:00:57 +08:00
parent 526ad3c842
commit 251adeb075
1 changed files with 2 additions and 2 deletions
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lkmpg.tex
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@ -888,8 +888,8 @@ With \cpp|cleanup_module| that's impossible because it is a void function.
However, there is a counter which keeps track of how many processes are using your module.
You can see what its value is by looking at the 3rd field of \verb|/proc/modules|.
If this number isn't zero, \sh|rmmod| will fail.
Note that you do not have to check the counter from within \cpp|cleanup_module| because the check will be performed for you by the system call \cpp|sys_delete_module|, defined in \verb|linux/module.c|.
You should not use this counter directly, but there are functions defined in \verb|linux/module.h| which let you increase, decrease and display this counter:
Note that you do not have to check the counter from within \cpp|cleanup_module| because the check will be performed for you by the system call \cpp|sys_delete_module|, defined in \verb|include/linux/syscalls.h|.
You should not use this counter directly, but there are functions defined in \verb|include/linux/module.h| which let you increase, decrease and display this counter:
\begin{itemize}
\item \cpp|try_module_get(THIS_MODULE)|: Increment the use count.