diff options
| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2023-09-25 21:31:43 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-10-19 09:12:46 +0300 |
| commit | 8e9bd41e4ce1001f5b89e4c9a69f870f39d56c12 (patch) | |
| tree | 4cc316f8970edf22d0d6613f0848b2c0b5fc6e8a | |
| parent | d20506d4728c3b7408e84d9aececbcb78c3061ee (diff) | |
| download | linux-8e9bd41e4ce1001f5b89e4c9a69f870f39d56c12.tar.xz | |
powerpc/nohash: Replace pte_user() by pte_read()
pte_user() is now only used in pte_access_permitted() to check
access on vmas. User flag is cleared to make a page unreadable.
So rename it pte_read() and remove pte_user() which isn't used
anymore.
For the time being it checks _PAGE_USER but in the near futur
all plateforms will be converted to _PAGE_READ so lets support
both for now.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/72cbb5be595e9ef884140def73815ed0b0b37010.1695659959.git.christophe.leroy@csgroup.eu
| -rw-r--r-- | arch/powerpc/include/asm/nohash/32/pte-8xx.h | 7 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/nohash/pgtable.h | 13 | ||||
| -rw-r--r-- | arch/powerpc/mm/ioremap.c | 4 |
3 files changed, 7 insertions, 17 deletions
diff --git a/arch/powerpc/include/asm/nohash/32/pte-8xx.h b/arch/powerpc/include/asm/nohash/32/pte-8xx.h index 62c965a4511a..1ee38befd29a 100644 --- a/arch/powerpc/include/asm/nohash/32/pte-8xx.h +++ b/arch/powerpc/include/asm/nohash/32/pte-8xx.h @@ -112,13 +112,6 @@ static inline pte_t pte_mkwrite_novma(pte_t pte) #define pte_mkwrite_novma pte_mkwrite_novma -static inline bool pte_user(pte_t pte) -{ - return !(pte_val(pte) & _PAGE_SH); -} - -#define pte_user pte_user - static inline pte_t pte_mkhuge(pte_t pte) { return __pte(pte_val(pte) | _PAGE_SPS | _PAGE_HUGE); diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h index 9a91efa6455b..84b6a160d2fc 100644 --- a/arch/powerpc/include/asm/nohash/pgtable.h +++ b/arch/powerpc/include/asm/nohash/pgtable.h @@ -159,9 +159,6 @@ static inline int pte_write(pte_t pte) return pte_val(pte) & _PAGE_WRITE; } #endif -#ifndef pte_read -static inline int pte_read(pte_t pte) { return 1; } -#endif static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } static inline int pte_none(pte_t pte) { return (pte_val(pte) & ~_PTE_NONE_MASK) == 0; } @@ -189,10 +186,14 @@ static inline int pte_young(pte_t pte) * and PTE_64BIT, PAGE_KERNEL_X contains _PAGE_BAP_SR which is also in * _PAGE_USER. Need to explicitly match _PAGE_BAP_UR bit in that case too. */ -#ifndef pte_user -static inline bool pte_user(pte_t pte) +#ifndef pte_read +static inline bool pte_read(pte_t pte) { +#ifdef _PAGE_READ + return (pte_val(pte) & _PAGE_READ) == _PAGE_READ; +#else return (pte_val(pte) & _PAGE_USER) == _PAGE_USER; +#endif } #endif @@ -207,7 +208,7 @@ static inline bool pte_access_permitted(pte_t pte, bool write) * A read-only access is controlled by _PAGE_USER bit. * We have _PAGE_READ set for WRITE and EXECUTE */ - if (!pte_present(pte) || !pte_user(pte) || !pte_read(pte)) + if (!pte_present(pte) || !pte_read(pte)) return false; if (write && !pte_write(pte)) diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c index 7823c38f09de..7b0afcabd89f 100644 --- a/arch/powerpc/mm/ioremap.c +++ b/arch/powerpc/mm/ioremap.c @@ -50,10 +50,6 @@ void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long flags) if (pte_write(pte)) pte = pte_mkdirty(pte); - /* we don't want to let _PAGE_USER leak out */ - if (WARN_ON(pte_user(pte))) - return NULL; - if (iowa_is_active()) return iowa_ioremap(addr, size, pte_pgprot(pte), caller); return __ioremap_caller(addr, size, pte_pgprot(pte), caller); |