Re: [PATCH 04/12] ARM: provide arm_has_idmap_alias() helper

[Pratyush Anand]

On Thu, Apr 28, 2016 at 2:58 PM, Russell King
 wrote:
> Provide a helper to indicate whether we need to perform special handling
> for boot identity mapping aliases or not.
>
> Signed-off-by: Russell King 
> ---
>  arch/arm/include/asm/memory.h | 5 +
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
> index ca208335fde6..31c07a2cc100 100644
> --- a/arch/arm/include/asm/memory.h
> +++ b/arch/arm/include/asm/memory.h
> @@ -295,6 +295,11 @@ extern long long arch_phys_to_idmap_offset;
>   * of physical memory for idmap purposes.  Most cases should leave these
>   * untouched.  Note: this can only return addresses less than 4GiB.
>   */
> +static inline bool arm_has_idmap_alias(void)
> +{
> +   return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
> +}
> +
>  #define IDMAP_INVALID_ADDR ((u32)~0)
>
>  static inline unsigned long phys_to_idmap(phys_addr_t addr)

Reviewed-by: Pratyush Anand 
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[PATCH 04/12] ARM: provide arm_has_idmap_alias() helper

[Russell King]

Provide a helper to indicate whether we need to perform special handling
for boot identity mapping aliases or not.

Signed-off-by: Russell King 
---
 arch/arm/include/asm/memory.h | 5 +
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index ca208335fde6..31c07a2cc100 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -295,6 +295,11 @@ extern long long arch_phys_to_idmap_offset;
  * of physical memory for idmap purposes.  Most cases should leave these
  * untouched.  Note: this can only return addresses less than 4GiB.
  */
+static inline bool arm_has_idmap_alias(void)
+{
+   return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
+}
+
 #define IDMAP_INVALID_ADDR ((u32)~0)
 
 static inline unsigned long phys_to_idmap(phys_addr_t addr)
-- 
2.1.0

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