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From: Daniel Axtens <dja@axtens.net>
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linuxppc-dev@lists.ozlabs.org, kasan-dev@googlegroups.com,
	christophe.leroy@c-s.fr, aneesh.kumar@linux.ibm.com,
	bsingharora@gmail.com
Cc: Daniel Axtens <dja@axtens.net>
Subject: [PATCH v9 3/6] kasan: define and use MAX_PTRS_PER_* for early shadow tables
Date: Wed,  2 Dec 2020 03:16:29 +1100	[thread overview]
Message-ID: <20201201161632.1234753-4-dja@axtens.net> (raw)
In-Reply-To: <20201201161632.1234753-1-dja@axtens.net>

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.leroy@c-s.fr>
Suggested-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Daniel Axtens <dja@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 3df66fdf6662..893d054aad6f 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -24,10 +24,22 @@ struct kunit_kasan_expectation {
 static inline bool kasan_arch_is_ready(void)	{ return true; }
 #endif
 
+#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 fe6be0be1f76..42bca3d27db8 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)
 {
-- 
2.25.1


  parent reply	other threads:[~2020-12-01 16:17 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-01 16:16 [PATCH v9 0/6] KASAN for powerpc64 radix Daniel Axtens
2020-12-01 16:16 ` [PATCH v9 1/6] kasan: allow an architecture to disable inline instrumentation Daniel Axtens
2020-12-01 16:49   ` Christophe Leroy
2020-12-01 16:16 ` [PATCH v9 2/6] kasan: allow architectures to provide an outline readiness check Daniel Axtens
2020-12-01 16:53   ` Christophe Leroy
2020-12-01 16:16 ` Daniel Axtens [this message]
2020-12-01 16:54   ` [PATCH v9 3/6] kasan: define and use MAX_PTRS_PER_* for early shadow tables Christophe Leroy
2020-12-01 16:16 ` [PATCH v9 4/6] kasan: Document support on 32-bit powerpc Daniel Axtens
2020-12-01 16:56   ` Christophe Leroy
2020-12-01 16:16 ` [PATCH v9 5/6] powerpc/mm/kasan: rename kasan_init_32.c to init_32.c Daniel Axtens
2020-12-01 16:56   ` Christophe Leroy
2020-12-01 16:16 ` [PATCH v9 6/6] powerpc: Book3S 64-bit outline-only KASAN support Daniel Axtens
2020-12-01 17:26   ` Christophe Leroy
2021-02-03 11:46     ` Daniel Axtens
2020-12-02 15:11 ` [PATCH v9 0/6] KASAN for powerpc64 radix Andrey Konovalov

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