diff options
| author | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-07-09 22:05:36 +0300 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-12-11 23:28:35 +0300 |
| commit | 6585bd827407f55ee30a782492208bfaf4f52feb (patch) | |
| tree | f4e619bfb9695ff72db6fe55cf2e0794d6f641ac /arch/arm64 | |
| parent | 914ee96654d87abc548bdd44ad9e4b3a14173cac (diff) | |
| download | linux-6585bd827407f55ee30a782492208bfaf4f52feb.tar.xz | |
arm64: Use the generic devmem_is_allowed()
I recently copied this into lib/ for use by the RISC-V port.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/Kconfig | 2 | ||||
| -rw-r--r-- | arch/arm64/include/asm/io.h | 2 | ||||
| -rw-r--r-- | arch/arm64/mm/mmap.c | 21 |
3 files changed, 1 insertions, 24 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 6d232837cbee..93d041ffe583 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -13,7 +13,6 @@ config ARM64 select ARCH_BINFMT_ELF_STATE select ARCH_HAS_DEBUG_VIRTUAL select ARCH_HAS_DEBUG_VM_PGTABLE - select ARCH_HAS_DEVMEM_IS_ALLOWED select ARCH_HAS_DMA_PREP_COHERENT select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI select ARCH_HAS_FAST_MULTIPLIER @@ -110,6 +109,7 @@ config ARM64 select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW select GENERIC_IRQ_SHOW_LEVEL + select GENERIC_LIB_DEVMEM_IS_ALLOWED select GENERIC_PCI_IOMAP select GENERIC_PTDUMP select GENERIC_SCHED_CLOCK diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h index ff50dd731852..c53eba1a7fd2 100644 --- a/arch/arm64/include/asm/io.h +++ b/arch/arm64/include/asm/io.h @@ -200,6 +200,4 @@ extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size); extern int valid_phys_addr_range(phys_addr_t addr, size_t size); extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size); -extern int devmem_is_allowed(unsigned long pfn); - #endif /* __ASM_IO_H */ diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c index 3028bacbc4e9..07937b49cb88 100644 --- a/arch/arm64/mm/mmap.c +++ b/arch/arm64/mm/mmap.c @@ -47,24 +47,3 @@ int valid_mmap_phys_addr_range(unsigned long pfn, size_t size) { return !(((pfn << PAGE_SHIFT) + size) & ~PHYS_MASK); } - -#ifdef CONFIG_STRICT_DEVMEM - -#include <linux/ioport.h> - -/* - * devmem_is_allowed() checks to see if /dev/mem access to a certain address - * is valid. The argument is a physical page number. We mimic x86 here by - * disallowing access to system RAM as well as device-exclusive MMIO regions. - * This effectively disable read()/write() on /dev/mem. - */ -int devmem_is_allowed(unsigned long pfn) -{ - if (iomem_is_exclusive(pfn << PAGE_SHIFT)) - return 0; - if (!page_is_ram(pfn)) - return 1; - return 0; -} - -#endif |