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authorSam Ravnborg <sam@ravnborg.org>2010-07-10 08:35:00 +0200
committerSteven Rostedt <rostedt@goodmis.org>2010-07-20 19:02:52 -0400
commit07fca0e57fca925032526349f4370f97ed580cc9 (patch)
tree04d8d6cbc89936c877cb385b300a6a1bacf57ae6
parent74534341c1214ac5993904680616afe698dde3b6 (diff)
tracing: Properly align linker defined symbols
We define a number of symbols in the linker scipt like this: __start_syscalls_metadata = .; *(__syscalls_metadata) But we do not know the alignment of "." when we assign the __start_syscalls_metadata symbol. gcc started to uses bigger alignment for structs (32 bytes), so we saw situations where the linker due to alignment constraints increased the value of "." after the symbol assignment. This resulted in boot fails. Fix this by forcing a 32 byte alignment of "." before the assignment. This patch introduces the forced alignment for ftrace_events and syscalls_metadata. It may be required in more places. Reported-by: Zeev Tarantov <zeev.tarantov@gmail.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> LKML-Reference: <20100710063459.GA14596@merkur.ravnborg.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-rw-r--r--include/asm-generic/vmlinux.lds.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 48c5299cbf26..4b5902ad0d5d 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -63,6 +63,12 @@
/* Align . to a 8 byte boundary equals to maximum function alignment. */
#define ALIGN_FUNCTION() . = ALIGN(8)
+/*
+ * Align to a 32 byte boundary equal to the
+ * alignment gcc 4.5 uses for a struct
+ */
+#define STRUCT_ALIGN() . = ALIGN(32)
+
/* The actual configuration determine if the init/exit sections
* are handled as text/data or they can be discarded (which
* often happens at runtime)
@@ -166,7 +172,11 @@
LIKELY_PROFILE() \
BRANCH_PROFILE() \
TRACE_PRINTKS() \
+ \
+ STRUCT_ALIGN(); \
FTRACE_EVENTS() \
+ \
+ STRUCT_ALIGN(); \
TRACE_SYSCALLS()
/*