Re: [PATCH v25 28/30] mm: Move arch_calc_vm_prot_bits() to arch/x86/include/asm/mman.h

[Kirill A. Shutemov]

On Thu, Apr 15, 2021 at 03:14:17PM -0700, Yu-cheng Yu wrote:
> To prepare the introduction of PROT_SHSTK and be consistent with other
> architectures, move arch_vm_get_page_prot() and arch_calc_vm_prot_bits() to
> arch/x86/include/asm/mman.h.
> 
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
> Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
> Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> ---
>  arch/x86/include/asm/mman.h      | 30 ++++++++++++++++++++++++++++++
>  arch/x86/include/uapi/asm/mman.h | 27 +++------------------------
>  2 files changed, 33 insertions(+), 24 deletions(-)
>  create mode 100644 arch/x86/include/asm/mman.h
> 
> diff --git a/arch/x86/include/asm/mman.h b/arch/x86/include/asm/mman.h
> new file mode 100644
> index 000000000000..629f6c81263a
> --- /dev/null
> +++ b/arch/x86/include/asm/mman.h
> @@ -0,0 +1,30 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_X86_MMAN_H
> +#define _ASM_X86_MMAN_H
> +
> +#include <linux/mm.h>
> +#include <uapi/asm/mman.h>
> +
> +#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
> +/*
> + * Take the 4 protection key bits out of the vma->vm_flags
> + * value and turn them in to the bits that we can put in
> + * to a pte.
> + *
> + * Only override these if Protection Keys are available
> + * (which is only on 64-bit).
> + */
> +#define arch_vm_get_page_prot(vm_flags)	__pgprot(	\
> +		((vm_flags) & VM_PKEY_BIT0 ? _PAGE_PKEY_BIT0 : 0) |	\
> +		((vm_flags) & VM_PKEY_BIT1 ? _PAGE_PKEY_BIT1 : 0) |	\
> +		((vm_flags) & VM_PKEY_BIT2 ? _PAGE_PKEY_BIT2 : 0) |	\
> +		((vm_flags) & VM_PKEY_BIT3 ? _PAGE_PKEY_BIT3 : 0))
> +
> +#define arch_calc_vm_prot_bits(prot, key) (		\
> +		((key) & 0x1 ? VM_PKEY_BIT0 : 0) |      \
> +		((key) & 0x2 ? VM_PKEY_BIT1 : 0) |      \
> +		((key) & 0x4 ? VM_PKEY_BIT2 : 0) |      \
> +		((key) & 0x8 ? VM_PKEY_BIT3 : 0))
> +#endif
> +
> +#endif /* _ASM_X86_MMAN_H */
> diff --git a/arch/x86/include/uapi/asm/mman.h b/arch/x86/include/uapi/asm/mman.h
> index d4a8d0424bfb..3ce1923e6ed9 100644
> --- a/arch/x86/include/uapi/asm/mman.h
> +++ b/arch/x86/include/uapi/asm/mman.h
> @@ -1,31 +1,10 @@
>  /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> -#ifndef _ASM_X86_MMAN_H
> -#define _ASM_X86_MMAN_H
> +#ifndef _UAPI_ASM_X86_MMAN_H
> +#define _UAPI_ASM_X86_MMAN_H
>  
>  #define MAP_32BIT	0x40		/* only give out 32bit addresses */
>  
> -#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
> -/*
> - * Take the 4 protection key bits out of the vma->vm_flags
> - * value and turn them in to the bits that we can put in
> - * to a pte.
> - *
> - * Only override these if Protection Keys are available
> - * (which is only on 64-bit).
> - */
> -#define arch_vm_get_page_prot(vm_flags)	__pgprot(	\
> -		((vm_flags) & VM_PKEY_BIT0 ? _PAGE_PKEY_BIT0 : 0) |	\
> -		((vm_flags) & VM_PKEY_BIT1 ? _PAGE_PKEY_BIT1 : 0) |	\
> -		((vm_flags) & VM_PKEY_BIT2 ? _PAGE_PKEY_BIT2 : 0) |	\
> -		((vm_flags) & VM_PKEY_BIT3 ? _PAGE_PKEY_BIT3 : 0))
> -
> -#define arch_calc_vm_prot_bits(prot, key) (		\
> -		((key) & 0x1 ? VM_PKEY_BIT0 : 0) |      \
> -		((key) & 0x2 ? VM_PKEY_BIT1 : 0) |      \
> -		((key) & 0x4 ? VM_PKEY_BIT2 : 0) |      \
> -		((key) & 0x8 ? VM_PKEY_BIT3 : 0))
> -#endif
>  

Looks like you leave two empty lines here.

Otherwise:

Reviewed-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>

>  #include <asm-generic/mman.h>
>  
> -#endif /* _ASM_X86_MMAN_H */
> +#endif /* _UAPI_ASM_X86_MMAN_H */
> -- 
> 2.21.0
> 
> 

-- 
 Kirill A. Shutemov