The patch titled
Subject: kasan: use MAX_PTRS_PER_* for early shadow tables
has been added to the -mm tree. Its filename is
kasan-use-max_ptrs_per_-for-early-shadow-tables.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kasan-use-max_ptrs_per_-for-early-shadow-tables.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kasan-use-max_ptrs_per_-for-early-shadow-tables.patch
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------------------------------------------------------
From: Daniel Axtens <dja@xxxxxxxxxx>
Subject: kasan: use MAX_PTRS_PER_* for early shadow tables
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. Switch to using MAX_PTRS_PER_*, which are constant.
Link: https://lkml.kernel.org/r/20210624034050.511391-5-dja@xxxxxxxxxx
Signed-off-by: Daniel Axtens <dja@xxxxxxxxxx>
Suggested-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Suggested-by: Balbir Singh <bsingharora@xxxxxxxxx>
Reviewed-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Reviewed-by: Balbir Singh <bsingharora@xxxxxxxxx>
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
Reviewed-by: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/kasan.h | 6 +++---
mm/kasan/init.c | 6 +++---
2 files changed, 6 insertions(+), 6 deletions(-)
--- a/include/linux/kasan.h~kasan-use-max_ptrs_per_-for-early-shadow-tables
+++ a/include/linux/kasan.h
@@ -40,9 +40,9 @@ struct kunit_kasan_expectation {
#endif
extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
-extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE + PTE_HWTABLE_PTRS];
-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 + PTE_HWTABLE_PTRS];
+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,
--- a/mm/kasan/init.c~kasan-use-max_ptrs_per_-for-early-shadow-tables
+++ a/mm/kasan/init.c
@@ -41,7 +41,7 @@ static inline bool kasan_p4d_table(pgd_t
}
#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));
@@ -53,7 +53,7 @@ static inline bool kasan_pud_table(p4d_t
}
#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));
@@ -64,7 +64,7 @@ static inline bool kasan_pmd_table(pud_t
return false;
}
#endif
-pte_t kasan_early_shadow_pte[PTRS_PER_PTE + PTE_HWTABLE_PTRS]
+pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE + PTE_HWTABLE_PTRS]
__page_aligned_bss;
static inline bool kasan_pte_table(pmd_t pmd)
_
Patches currently in -mm which might be from dja@xxxxxxxxxx are
mm-vmalloc-unbreak-kasan-vmalloc-support.patch
kasan-allow-an-architecture-to-disable-inline-instrumentation.patch
kasan-allow-architectures-to-provide-an-outline-readiness-check.patch
mm-define-default-max_ptrs_per_-in-include-pgtableh.patch
kasan-use-max_ptrs_per_-for-early-shadow-tables.patch
