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authorJason Baron <jbaron@redhat.com>2010-09-17 11:09:00 -0400
committerSteven Rostedt <rostedt@goodmis.org>2010-09-22 16:29:41 -0400
commitbf5438fca2950b03c21ad868090cc1a8fcd49536 (patch)
tree9fc5693763263704de8d8ba1c37a84172dbe5eb7 /include/linux/module.h
parentfa6f2cc77081792e4edca9168420a3422299ef15 (diff)
downloadlwn-bf5438fca2950b03c21ad868090cc1a8fcd49536.tar.gz
lwn-bf5438fca2950b03c21ad868090cc1a8fcd49536.zip
jump label: Base patch for jump label
base patch to implement 'jump labeling'. Based on a new 'asm goto' inline assembly gcc mechanism, we can now branch to labels from an 'asm goto' statment. This allows us to create a 'no-op' fastpath, which can subsequently be patched with a jump to the slowpath code. This is useful for code which might be rarely used, but which we'd like to be able to call, if needed. Tracepoints are the current usecase that these are being implemented for. Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jason Baron <jbaron@redhat.com> LKML-Reference: <ee8b3595967989fdaf84e698dc7447d315ce972a.1284733808.git.jbaron@redhat.com> [ cleaned up some formating ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/module.h')
-rw-r--r--include/linux/module.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/module.h b/include/linux/module.h
index 8a6b9fdc7ffa..403ac26023ce 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -350,7 +350,10 @@ struct module
struct tracepoint *tracepoints;
unsigned int num_tracepoints;
#endif
-
+#ifdef HAVE_JUMP_LABEL
+ struct jump_entry *jump_entries;
+ unsigned int num_jump_entries;
+#endif
#ifdef CONFIG_TRACING
const char **trace_bprintk_fmt_start;
unsigned int num_trace_bprintk_fmt;