powerpc has a variable number of PTRS_PER_*, set at runtime based on the MMU that the kernel is booted under.
This means the PTRS_PER_* are no longer constants, and therefore breaks the build. Define default MAX_PTRS_PER_*s in the same style as MAX_PTRS_PER_P4D. As KASAN is the only user at the moment, just define them in the kasan header, and have them default to PTRS_PER_* unless overridden in arch code. Suggested-by: Christophe Leroy <christophe.le...@c-s.fr> Suggested-by: Balbir Singh <bsinghar...@gmail.com> Reviewed-by: Christophe Leroy <christophe.le...@c-s.fr> Reviewed-by: Balbir Singh <bsinghar...@gmail.com> Signed-off-by: Daniel Axtens <d...@axtens.net> --- include/linux/kasan.h | 18 +++++++++++++++--- mm/kasan/init.c | 6 +++--- 2 files changed, 18 insertions(+), 6 deletions(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index 5cde9e7c2664..b3a4500633f5 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -14,10 +14,22 @@ struct task_struct; #include <asm/kasan.h> #include <asm/pgtable.h> +#ifndef MAX_PTRS_PER_PTE +#define MAX_PTRS_PER_PTE PTRS_PER_PTE +#endif + +#ifndef MAX_PTRS_PER_PMD +#define MAX_PTRS_PER_PMD PTRS_PER_PMD +#endif + +#ifndef MAX_PTRS_PER_PUD +#define MAX_PTRS_PER_PUD PTRS_PER_PUD +#endif + extern unsigned char kasan_early_shadow_page[PAGE_SIZE]; -extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE]; -extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD]; -extern pud_t kasan_early_shadow_pud[PTRS_PER_PUD]; +extern pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE]; +extern pmd_t kasan_early_shadow_pmd[MAX_PTRS_PER_PMD]; +extern pud_t kasan_early_shadow_pud[MAX_PTRS_PER_PUD]; extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D]; int kasan_populate_early_shadow(const void *shadow_start, diff --git a/mm/kasan/init.c b/mm/kasan/init.c index ce45c491ebcd..8b54a96d3b3e 100644 --- a/mm/kasan/init.c +++ b/mm/kasan/init.c @@ -46,7 +46,7 @@ static inline bool kasan_p4d_table(pgd_t pgd) } #endif #if CONFIG_PGTABLE_LEVELS > 3 -pud_t kasan_early_shadow_pud[PTRS_PER_PUD] __page_aligned_bss; +pud_t kasan_early_shadow_pud[MAX_PTRS_PER_PUD] __page_aligned_bss; static inline bool kasan_pud_table(p4d_t p4d) { return p4d_page(p4d) == virt_to_page(lm_alias(kasan_early_shadow_pud)); @@ -58,7 +58,7 @@ static inline bool kasan_pud_table(p4d_t p4d) } #endif #if CONFIG_PGTABLE_LEVELS > 2 -pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD] __page_aligned_bss; +pmd_t kasan_early_shadow_pmd[MAX_PTRS_PER_PMD] __page_aligned_bss; static inline bool kasan_pmd_table(pud_t pud) { return pud_page(pud) == virt_to_page(lm_alias(kasan_early_shadow_pmd)); @@ -69,7 +69,7 @@ static inline bool kasan_pmd_table(pud_t pud) return false; } #endif -pte_t kasan_early_shadow_pte[PTRS_PER_PTE] __page_aligned_bss; +pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE] __page_aligned_bss; static inline bool kasan_pte_table(pmd_t pmd) { -- 2.20.1