There are currently four architectures (x86, ia64, alpha and s390) whose user-access exception tables are relative to the table entry address rather than absolute. Each of these architectures has its own search_extable() and sort_extable() implementation, which are not only mostly identical to each other, but also deviate very little from the generic absolute implementations in lib/extable.c that they override. So before making arm64 the fifth architecture that reimplements this, let's refactor the existing code so that all of these architectures use common code for searching and sorting the relative extables. Archs may set ARCH_HAS_RELATIVE_EXTABLE to indicate that the table consists of a pair of relative ints, and may define swap_ex_entry_fixup() if the fixup member needs special treatment in the swapping step of the sorting routine (such as alpha). This version is identical to v2, with the exception of an added ack from Richard Henderson for the alpha patch (#2), and, by implication, for patch #1. Changes since v2: - introduce the _ASM_EXTABLE() cpp macro for arm64, and replace all open coded exception table entries with it, including an instance I missed in v1 in asm/word-at-a-time.h (suggested by hpa) - added acks to from arch maintainers NOTE: I took the liberty of carrying over each arch specific ack to the generic shared first patch, since they are tightly coupled anyway. If anyone objects to this, please let me know. @Andrew: I was wondering if this was also something that could be taken through your tree? It has acks for each of the architectures it touches, and it rebased cleanly from v4.4 to v4.5-rc1. Ard Biesheuvel (6): extable: add support for relative extables to search and sort routines alpha/extable: use generic search and sort routines s390/extable: use generic search and sort routines x86/extable: use generic search and sort routines ia64/extable: use generic search and sort routines arm64: switch to relative exception tables arch/alpha/include/asm/uaccess.h | 10 +- arch/alpha/mm/Makefile | 2 +- arch/alpha/mm/extable.c | 92 ----------------- arch/arm64/include/asm/assembler.h | 15 ++- arch/arm64/include/asm/futex.h | 12 +-- arch/arm64/include/asm/uaccess.h | 30 +++--- arch/arm64/include/asm/word-at-a-time.h | 7 +- arch/arm64/kernel/armv8_deprecated.c | 7 +- arch/arm64/mm/extable.c | 2 +- arch/ia64/include/asm/uaccess.h | 8 +- arch/ia64/mm/extable.c | 97 +----------------- arch/s390/include/asm/uaccess.h | 8 +- arch/s390/mm/Makefile | 2 +- arch/s390/mm/extable.c | 85 ---------------- arch/x86/include/asm/uaccess.h | 5 +- arch/x86/mm/extable.c | 106 +------------------- lib/extable.c | 50 +++++++-- scripts/sortextable.c | 2 +- 18 files changed, 98 insertions(+), 442 deletions(-) delete mode 100644 arch/alpha/mm/extable.c delete mode 100644 arch/s390/mm/extable.c -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
