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SubjectRe: [OpenRISC] [RFC V1 22/31] openrisc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT
On Mon, Jan 24, 2022 at 06:26:59PM +0530, Anshuman Khandual wrote:
> This defines and exports a platform specific custom vm_get_page_prot() via
> subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX
> macros can be dropped which are no longer needed.
>
> Cc: Jonas Bonn <jonas@southpole.se>
> Cc: openrisc@lists.librecores.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>

For one thing this is easier to read than the __P000 codes.

Acked-by: Stafford Horne <shorne@gmail.com>

> ---
> arch/openrisc/Kconfig | 1 +
> arch/openrisc/include/asm/pgtable.h | 18 -------------
> arch/openrisc/mm/init.c | 41 +++++++++++++++++++++++++++++
> 3 files changed, 42 insertions(+), 18 deletions(-)
>
> diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
> index f724b3f1aeed..842a61426816 100644
> --- a/arch/openrisc/Kconfig
> +++ b/arch/openrisc/Kconfig
> @@ -10,6 +10,7 @@ config OPENRISC
> select ARCH_HAS_DMA_SET_UNCACHED
> select ARCH_HAS_DMA_CLEAR_UNCACHED
> select ARCH_HAS_SYNC_DMA_FOR_DEVICE
> + select ARCH_HAS_VM_GET_PAGE_PROT
> select COMMON_CLK
> select OF
> select OF_EARLY_FLATTREE
> diff --git a/arch/openrisc/include/asm/pgtable.h b/arch/openrisc/include/asm/pgtable.h
> index cdd657f80bfa..fe686c4b7065 100644
> --- a/arch/openrisc/include/asm/pgtable.h
> +++ b/arch/openrisc/include/asm/pgtable.h
> @@ -176,24 +176,6 @@ extern void paging_init(void);
> __pgprot(_PAGE_ALL | _PAGE_SRE | _PAGE_SWE \
> | _PAGE_SHARED | _PAGE_DIRTY | _PAGE_EXEC | _PAGE_CI)
>
> -#define __P000 PAGE_NONE
> -#define __P001 PAGE_READONLY_X
> -#define __P010 PAGE_COPY
> -#define __P011 PAGE_COPY_X
> -#define __P100 PAGE_READONLY
> -#define __P101 PAGE_READONLY_X
> -#define __P110 PAGE_COPY
> -#define __P111 PAGE_COPY_X
> -
> -#define __S000 PAGE_NONE
> -#define __S001 PAGE_READONLY_X
> -#define __S010 PAGE_SHARED
> -#define __S011 PAGE_SHARED_X
> -#define __S100 PAGE_READONLY
> -#define __S101 PAGE_READONLY_X
> -#define __S110 PAGE_SHARED
> -#define __S111 PAGE_SHARED_X
> -
> /* zero page used for uninitialized stuff */
> extern unsigned long empty_zero_page[2048];
> #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
> diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c
> index 97305bde1b16..c9f5e7d6bb59 100644
> --- a/arch/openrisc/mm/init.c
> +++ b/arch/openrisc/mm/init.c
> @@ -210,3 +210,44 @@ void __init mem_init(void)
> mem_init_done = 1;
> return;
> }
> +
> +pgprot_t vm_get_page_prot(unsigned long vm_flags)
> +{
> + switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) {
> + case VM_NONE:
> + return PAGE_NONE;
> + case VM_READ:
> + return PAGE_READONLY_X;
> + case VM_WRITE:
> + return PAGE_COPY;
> + case VM_READ | VM_WRITE:
> + return PAGE_COPY_X;
> + case VM_EXEC:
> + return PAGE_READONLY;
> + case VM_EXEC | VM_READ:
> + return PAGE_READONLY_X;
> + case VM_EXEC | VM_WRITE:
> + return PAGE_COPY;
> + case VM_EXEC | VM_READ | VM_WRITE:
> + return PAGE_COPY_X;
> + case VM_SHARED:
> + return PAGE_NONE;
> + case VM_SHARED | VM_READ:
> + return PAGE_READONLY_X;
> + case VM_SHARED | VM_WRITE:
> + return PAGE_SHARED;
> + case VM_SHARED | VM_READ | VM_WRITE:
> + return PAGE_SHARED_X;
> + case VM_SHARED | VM_EXEC:
> + return PAGE_READONLY;
> + case VM_SHARED | VM_EXEC | VM_READ:
> + return PAGE_READONLY_X;
> + case VM_SHARED | VM_EXEC | VM_WRITE:
> + return PAGE_SHARED;
> + case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE:
> + return PAGE_SHARED_X;
> + default:
> + BUILD_BUG();
> + }
> +}
> +EXPORT_SYMBOL(vm_get_page_prot);
> --
> 2.25.1
>
> _______________________________________________
> OpenRISC mailing list
> OpenRISC@lists.librecores.org
> https://lists.librecores.org/listinfo/openrisc

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