On Sat, Mar 26, 2005 at 03:43:03AM +0300, Alexey Dobriyan wrote:
> While building 2.6.12-rc1-bk1 with attached config I get "Inconsistent
> kallsyms data".
>
> Setting CONFIG_KALLSYMS_EXTRA_PASS or CONFIG_KALLSYMS_ALL fixes the problem.
Please try attached patch. What you see may be the linker deciding to
re-shuffle some sections a bit more than usual.
Patch has been in -mm for a while.
Sam
# This is a BitKeeper generated diff -Nru style patch.
#
# ChangeSet
# 2005/03/14 20:56:01+01:00 [email protected]
# kbuild: Avoid inconsistent kallsyms data
#
# Several reports on inconsistent kallsyms data has been caused by the aliased symbols
# __sched_text_start and __down to shift places in the output of nm.
# The root cause was that on second pass ld aligned __sched_text_start to a 4 byte boundary
# which is the function alignment on i386.
# sched.text and spinlock.text is now aligned to an 8 byte boundary to make sure they
# are aligned to a function alignemnt on most (all?) archs.
#
# Tested by: Paulo Marques <[email protected]>
# Tested by: Alexander Stohr <[email protected]>
#
# Signed-off-by: Sam Ravnborg <[email protected]>
#
# include/asm-generic/vmlinux.lds.h
# 2005/03/14 20:55:39+01:00 [email protected] +9 -0
# Align sched.text and spinlock.text to an 8 byte boundary
#
diff -Nru a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
--- a/include/asm-generic/vmlinux.lds.h 2005-03-26 09:07:42 +01:00
+++ b/include/asm-generic/vmlinux.lds.h 2005-03-26 09:07:42 +01:00
@@ -6,6 +6,9 @@
#define VMLINUX_SYMBOL(_sym_) _sym_
#endif
+/* Align . to a 8 byte boundary equals to maximum function alignment. */
+#define ALIGN_FUNCTION() . = ALIGN(8)
+
#define RODATA \
.rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
*(.rodata) *(.rodata.*) \
@@ -79,12 +82,18 @@
VMLINUX_SYMBOL(__security_initcall_end) = .; \
}
+/* sched.text is aling to function alignment to secure we have same
+ * address even at second ld pass when generating System.map */
#define SCHED_TEXT \
+ ALIGN_FUNCTION(); \
VMLINUX_SYMBOL(__sched_text_start) = .; \
*(.sched.text) \
VMLINUX_SYMBOL(__sched_text_end) = .;
+/* spinlock.text is aling to function alignment to secure we have same
+ * address even at second ld pass when generating System.map */
#define LOCK_TEXT \
+ ALIGN_FUNCTION(); \
VMLINUX_SYMBOL(__lock_text_start) = .; \
*(.spinlock.text) \
VMLINUX_SYMBOL(__lock_text_end) = .;
-
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