mirror of
https://github.com/dynup/kpatch
synced 2024-12-19 11:54:29 +00:00
bfad3b1880
My apologies for the size of this commit. I combined these two features (updating API and using a hash table) into a single commit because their implementations are tightly coupled and I didn't want to have to add support for the old kpatch_funcs array with the new API just for the sake of splitting up the commit :-) - Update the core module API to get a more clear separation between core module and patch module. This is cleaner and will help our case for getting the core module merged upstream into the kernel. - Convert the old kpatch_funcs array into a hash table. This is so much nicer performance-wise and everything-else-wise than that ugly old array. - Do the incremental patching in stop machine. This ensures that the funcs hash is up to date and we don't miss anything. - Disable preemption in the ftrace handler when accessing the func hash. That way we don't get conflicts with the stop_machine handler updating the hash.
44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/*
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* kpatch.h
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*
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* Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
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* Copyright (C) 2013-2014 Josh Poimboeuf <jpoimboe@redhat.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA,
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* 02110-1301, USA.
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*
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* Contains the API for the core kpatch module used by the patch modules
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*/
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#ifndef _KPATCH_H_
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#define _KPATCH_H_
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#include <linux/types.h>
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struct kpatch_func {
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unsigned long new_addr;
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unsigned long old_addr;
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unsigned long old_size;
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struct module *mod;
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struct hlist_node node;
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};
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extern int kpatch_register(struct module *mod, struct kpatch_func *funcs,
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int num_funcs);
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extern int kpatch_unregister(struct module *mod, struct kpatch_func *funcs,
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int num_funcs);
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#endif /* _KPATCH_H_ */
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