These two patches allow a proper ro_after_init implementation on s390. The current implementation maps __ro_after_init to __read_mostly, which means that ro_after_init data won't be write protected at all.
Reason for this is that s390 write protects rodata very early (before init calls) and therefore adding ro_after_init data to rodata would lead to crashes. Since I don't want to mark the page table entries much later read-only on s390 just to make this work, allow an architecture specific handling which can be used to move the ro_after_init data to a different place which can be marked read-only later when mark_rodata_ro gets executed. Note: these patches require the s390 kernel page table splitting support which currently is only available at git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features (included in linux-next) Therefore, if we can agree on this solution I'd like to add these patches to the s390 tree, so it can be merged during the next merge window. Heiko Carstens (2): vmlinux.lds.h: allow arch specific handling of ro_after_init data section s390/mm: add proper __ro_after_init support arch/s390/include/asm/cache.h | 3 --- arch/s390/include/asm/sections.h | 1 + arch/s390/kernel/vmlinux.lds.S | 12 +++++++++++- arch/s390/mm/init.c | 7 ++++--- arch/s390/mm/vmem.c | 7 +++---- include/asm-generic/vmlinux.lds.h | 10 +++++++++- 6 files changed, 28 insertions(+), 12 deletions(-) -- 2.6.6
