pid: pid_ns_ctl_handler: remove useless comment
commit 95846ecf9dac("pid: replace pid bitmap implementation with IDR API") removes 'last_pid' element, and use the idr_get_cursor-idr_set_cursor pair to set the value of idr, so useless comments should be removed. Link: https://lkml.kernel.org/r/tencent_157A2A1CAF19A3F5885F0687426159A19708@qq.com Signed-off-by: Rong Tao <rongtao@cestc.cn> Cc: Aleksa Sarai <cyphar@cyphar.com> Cc: Christian Brauner <brauner@kernel.org> Cc: Frederic Weisbecker <frederic@kernel.org> Cc: Jeff Xu <jeffxu@google.com> Cc: Kees Cook <keescook@chromium.org> Cc: Luis Chamberlain <mcgrof@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -286,12 +286,6 @@ static int pid_ns_ctl_handler(struct ctl_table *table, int write,
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if (write && !checkpoint_restore_ns_capable(pid_ns->user_ns))
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if (write && !checkpoint_restore_ns_capable(pid_ns->user_ns))
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return -EPERM;
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return -EPERM;
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/*
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* Writing directly to ns' last_pid field is OK, since this field
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* is volatile in a living namespace anyway and a code writing to
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* it should synchronize its usage with external means.
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*/
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next = idr_get_cursor(&pid_ns->idr) - 1;
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next = idr_get_cursor(&pid_ns->idr) - 1;
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tmp.data = &next;
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tmp.data = &next;
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