From 6d30e3a8995c9fa9e8471bb1dff8e070638df5ea Mon Sep 17 00:00:00 2001 From: Sam Ravnborg Date: Thu, 14 Jul 2005 20:15:44 +0000 Subject: [PATCH] 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 Tested by: Alexander Stohr Signed-off-by: Sam Ravnborg --- include/asm-generic/vmlinux.lds.h | 9 +++++++++ 1 file changed, 9 insertions(+) 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) = .;