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| author | Sam Ravnborg <sam@mars.(none)> | 2005-07-14 22:15:44 +0200 |
|---|---|---|
| committer | Sam Ravnborg <sam@mars.(none)> | 2005-07-14 22:15:44 +0200 |
| commit | 6d30e3a8995c9fa9e8471bb1dff8e070638df5ea (patch) | |
| tree | c93562d7c66856108e7dfe43e1e85304cebb5d91 /include | |
| parent | buildcheck: reduce DEBUG_INFO noise from reference* scripts (diff) | |
| download | linux-6d30e3a8995c9fa9e8471bb1dff8e070638df5ea.tar.xz linux-6d30e3a8995c9fa9e8471bb1dff8e070638df5ea.zip | |
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 <pmarques@grupopie.com>
Tested by: Alexander Stohr <Alexander.Stohr@gmx.de>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Diffstat (limited to '')
| -rw-r--r-- | include/asm-generic/vmlinux.lds.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index b3bb326ae5b6..3fa94288aa93 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -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) = .; |