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Tue, 1 Dec 2020 17:54:39 +0100 (CET) Subject: Re: [PATCH v9 3/6] kasan: define and use MAX_PTRS_PER_* for early shadow tables To: Daniel Axtens , 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 References: <20201201161632.1234753-1-dja@axtens.net> <20201201161632.1234753-4-dja@axtens.net> From: Christophe Leroy Message-ID: Date: Tue, 1 Dec 2020 17:54:34 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 In-Reply-To: <20201201161632.1234753-4-dja@axtens.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Le 01/12/2020 =C3=A0 17:16, Daniel Axtens a =C3=A9crit=C2=A0: > powerpc has a variable number of PTRS_PER_*, set at runtime based > on the MMU that the kernel is booted under. >=20 > This means the PTRS_PER_* are no longer constants, and therefore > breaks the build. >=20 > 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. >=20 > Suggested-by: Christophe Leroy My neww address is : christophe.leroy@csgroup.eu > Suggested-by: Balbir Singh > Reviewed-by: Christophe Leroy Same > Reviewed-by: Balbir Singh > Signed-off-by: Daniel Axtens > --- > include/linux/kasan.h | 18 +++++++++++++++--- > mm/kasan/init.c | 6 +++--- > 2 files changed, 18 insertions(+), 6 deletions(-) >=20 > 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 > =20 > +#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]; > =20 > 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) =3D=3D 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) =3D=3D 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; > =20 > static inline bool kasan_pte_table(pmd_t pmd) > { >=20