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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-10-28 22:15:27 +0100 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-11-13 18:15:28 +0100 |
| commit | 2860cd8a235375df3c8ec8039d9fe5eb2f658b86 (patch) | |
| tree | fdc9022ea4057f4d410d7b907b158d7cbb8787e8 /arch/s390/include/asm | |
| parent | ftrace/x86: Allow for arguments to be passed in to ftrace_regs by default (diff) | |
| download | linux-2860cd8a235375df3c8ec8039d9fe5eb2f658b86.tar.xz linux-2860cd8a235375df3c8ec8039d9fe5eb2f658b86.zip | |
livepatch: Use the default ftrace_ops instead of REGS when ARGS is available
When CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS is available, the ftrace call
will be able to set the ip of the calling function. This will improve the
performance of live kernel patching where it does not need all the regs to
be stored just to change the instruction pointer.
If all archs that support live kernel patching also support
HAVE_DYNAMIC_FTRACE_WITH_ARGS, then the architecture specific function
klp_arch_set_pc() could be made generic.
It is possible that an arch can support HAVE_DYNAMIC_FTRACE_WITH_ARGS but
not HAVE_DYNAMIC_FTRACE_WITH_REGS and then have access to live patching.
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: live-patching@vger.kernel.org
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'arch/s390/include/asm')
| -rw-r--r-- | arch/s390/include/asm/livepatch.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/s390/include/asm/livepatch.h b/arch/s390/include/asm/livepatch.h index 818612b784cd..d578a8c76676 100644 --- a/arch/s390/include/asm/livepatch.h +++ b/arch/s390/include/asm/livepatch.h @@ -11,10 +11,13 @@ #ifndef ASM_LIVEPATCH_H #define ASM_LIVEPATCH_H +#include <linux/ftrace.h> #include <asm/ptrace.h> -static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip) +static inline void klp_arch_set_pc(struct ftrace_regs *fregs, unsigned long ip) { + struct pt_regs *regs = ftrace_get_regs(fregs); + regs->psw.addr = ip; } |