2015-08-10 9:01 GMT+03:00 Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>: > Andrey Ryabinin <a.ryabinin@xxxxxxxxxxx> writes: > >> Introduce generic kasan_populate_zero_shadow(start, end). >> This function maps kasan_zero_page to the [start, end] addresses. >> >> In follow on patches it will be used for ARMv8 (and maybe other >> architectures) and will replace x86_64 specific populate_zero_shadow(). >> >> Signed-off-by: Andrey Ryabinin <a.ryabinin@xxxxxxxxxxx> > > This assume that we can have shared pgtable_t in generic code ? Is that > true for generic code ? Even if it is we may want to allow some arch to > override this ? On ppc64, we store the hardware hash page table slot > number in pte_t, Hence we won't be able to share pgtable_t. > So, ppc64 could define some config which will disable compilation of mm/kasan/kasan_init.c. However, it might be a bad idea to use such never defined config symbol now. So I think this could be done later, in "KASAN for powerpc" series. > > >> --- >> arch/x86/mm/kasan_init_64.c | 14 ---- >> include/linux/kasan.h | 8 +++ >> mm/kasan/Makefile | 2 +- >> mm/kasan/kasan_init.c | 151 ++++++++++++++++++++++++++++++++++++++++++++ >> 4 files changed, 160 insertions(+), 15 deletions(-) >> create mode 100644 mm/kasan/kasan_init.c >> >> diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c >> index e1840f3..812086c 100644 >> --- a/arch/x86/mm/kasan_init_64.c >> +++ b/arch/x86/mm/kasan_init_64.c >> @@ -12,20 +12,6 @@ >> extern pgd_t early_level4_pgt[PTRS_PER_PGD]; >> extern struct range pfn_mapped[E820_X_MAX]; >> >> -static pud_t kasan_zero_pud[PTRS_PER_PUD] __page_aligned_bss; >> -static pmd_t kasan_zero_pmd[PTRS_PER_PMD] __page_aligned_bss; >> -static pte_t kasan_zero_pte[PTRS_PER_PTE] __page_aligned_bss; >> - >> -/* > > -aneesh > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>