forked from Minki/linux
b9dfe0bed9
We are aborting a build in case when gcc doesn't support fentry on x86_64 (regs->ip modification can't really reliably work with mcount). This however breaks allmodconfig for people with older gccs that don't support -mfentry. Turn the build-time failure into runtime failure, resulting in the whole infrastructure not being initialized if CC_USING_FENTRY is unset. Reported-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/*
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* livepatch.h - x86-specific Kernel Live Patching Core
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*
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* Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
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* Copyright (C) 2014 SUSE
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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, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _ASM_X86_LIVEPATCH_H
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#define _ASM_X86_LIVEPATCH_H
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#include <linux/module.h>
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#include <linux/ftrace.h>
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#ifdef CONFIG_LIVE_PATCHING
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static inline int klp_check_compiler_support(void)
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{
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#ifndef CC_USING_FENTRY
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return 1;
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#endif
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return 0;
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}
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extern int klp_write_module_reloc(struct module *mod, unsigned long type,
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unsigned long loc, unsigned long value);
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static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
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{
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regs->ip = ip;
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}
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#else
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#error Live patching support is disabled; check CONFIG_LIVE_PATCHING
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#endif
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#endif /* _ASM_X86_LIVEPATCH_H */
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