On 01/04/2016 03:20 AM, Heiko Carstens wrote: > On Sun, Jan 03, 2016 at 05:05:51PM +0100, Ard Biesheuvel wrote: >> 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). >> >> Note that the s390 patch applies on top of the following patch: >> >> http://article.gmane.org/gmane.linux.kernel/2117036 >> >> which fixes a bug I spotted while working on this code. Since that probably >> needs to go to -stable, I broke it out and posted it separately. >> >> 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 > > For the s390 bits: > > Acked-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx> > For the x86 bits: Acked-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> *However*, please see my comment about generalizing _ASM_EXTABLE() for the non-x86 architectures. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-alpha" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
