Patchwork [v2,09/10] mm, cma: move output param to the end of param list

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Submitter Joonsoo Kim
Date June 12, 2014, 3:21 a.m.
Message ID <1402543307-29800-10-git-send-email-iamjoonsoo.kim@lge.com>
Download mbox | patch
Permalink /patch/358967/
State New
Headers show

Comments

Joonsoo Kim - June 12, 2014, 3:21 a.m.
Conventionally, we put output param to the end of param list.
cma_declare_contiguous() doesn't look like that, so change it.

Additionally, move down cma_areas reference code to the position
where it is really needed.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Minchan Kim - June 12, 2014, 7:19 a.m.
On Thu, Jun 12, 2014 at 12:21:46PM +0900, Joonsoo Kim wrote:
> Conventionally, we put output param to the end of param list.
> cma_declare_contiguous() doesn't look like that, so change it.

If you says "Conventionally", I'd like to suggest one more thing.
Conventionally, we put 'base' ahead 'size' but dma_contiguous_reserve_area
is opposite.

> 
> Additionally, move down cma_areas reference code to the position
> where it is really needed.
> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
> 
> diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c
> index 28ec226..97613ea 100644
> --- a/arch/powerpc/kvm/book3s_hv_builtin.c
> +++ b/arch/powerpc/kvm/book3s_hv_builtin.c
> @@ -184,7 +184,7 @@ void __init kvm_cma_reserve(void)
>  
>  		align_size = max(kvm_rma_pages << PAGE_SHIFT, align_size);
>  		cma_declare_contiguous(selected_size, 0, 0, align_size,
> -			KVM_CMA_CHUNK_ORDER - PAGE_SHIFT, &kvm_cma, false);
> +			KVM_CMA_CHUNK_ORDER - PAGE_SHIFT, false, &kvm_cma);
>  	}
>  }
>  
> diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
> index f177f73..bfd4553 100644
> --- a/drivers/base/dma-contiguous.c
> +++ b/drivers/base/dma-contiguous.c
> @@ -149,7 +149,7 @@ int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
>  {
>  	int ret;
>  
> -	ret = cma_declare_contiguous(size, base, limit, 0, 0, res_cma, fixed);
> +	ret = cma_declare_contiguous(size, base, limit, 0, 0, fixed, res_cma);
>  	if (ret)
>  		return ret;
>  
> diff --git a/include/linux/cma.h b/include/linux/cma.h
> index e38efe9..e53eead 100644
> --- a/include/linux/cma.h
> +++ b/include/linux/cma.h
> @@ -6,7 +6,7 @@ struct cma;
>  extern int __init cma_declare_contiguous(phys_addr_t size,
>  				phys_addr_t base, phys_addr_t limit,
>  				phys_addr_t alignment, int order_per_bit,
> -				struct cma **res_cma, bool fixed);
> +				bool fixed, struct cma **res_cma);
>  extern struct page *cma_alloc(struct cma *cma, int count, unsigned int align);
>  extern bool cma_release(struct cma *cma, struct page *pages, int count);
>  #endif
> diff --git a/mm/cma.c b/mm/cma.c
> index 01a0713..22a5b23 100644
> --- a/mm/cma.c
> +++ b/mm/cma.c
> @@ -142,8 +142,8 @@ core_initcall(cma_init_reserved_areas);
>   * @limit: End address of the reserved memory (optional, 0 for any).
>   * @alignment: Alignment for the contiguous memory area, should be power of 2
>   * @order_per_bit: Order of pages represented by one bit on bitmap.
> - * @res_cma: Pointer to store the created cma region.
>   * @fixed: hint about where to place the reserved area
> + * @res_cma: Pointer to store the created cma region.
>   *
>   * This function reserves memory from early allocator. It should be
>   * called by arch specific code once the early allocator (memblock or bootmem)
> @@ -156,9 +156,9 @@ core_initcall(cma_init_reserved_areas);
>  int __init cma_declare_contiguous(phys_addr_t size,
>  				phys_addr_t base, phys_addr_t limit,
>  				phys_addr_t alignment, int order_per_bit,
> -				struct cma **res_cma, bool fixed)
> +				bool fixed, struct cma **res_cma)
>  {
> -	struct cma *cma = &cma_areas[cma_area_count];
> +	struct cma *cma;
>  	int ret = 0;
>  
>  	pr_debug("%s(size %lx, base %08lx, limit %08lx alignment %08lx)\n",
> @@ -214,6 +214,7 @@ int __init cma_declare_contiguous(phys_addr_t size,
>  	 * Each reserved area must be initialised later, when more kernel
>  	 * subsystems (like slab allocator) are available.
>  	 */
> +	cma = &cma_areas[cma_area_count];
>  	cma->base_pfn = PFN_DOWN(base);
>  	cma->count = size >> PAGE_SHIFT;
>  	cma->order_per_bit = order_per_bit;
> -- 
> 1.7.9.5
Joonsoo Kim - June 12, 2014, 7:43 a.m.
On Thu, Jun 12, 2014 at 04:19:31PM +0900, Minchan Kim wrote:
> On Thu, Jun 12, 2014 at 12:21:46PM +0900, Joonsoo Kim wrote:
> > Conventionally, we put output param to the end of param list.
> > cma_declare_contiguous() doesn't look like that, so change it.
> 
> If you says "Conventionally", I'd like to suggest one more thing.
> Conventionally, we put 'base' ahead 'size' but dma_contiguous_reserve_area
> is opposite.

Okay. I will do it. :)

Thanks.

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Michal Nazarewicz - June 12, 2014, 11:38 a.m.
On Thu, Jun 12 2014, Joonsoo Kim <iamjoonsoo.kim@lge.com> wrote:
> Conventionally, we put output param to the end of param list.
> cma_declare_contiguous() doesn't look like that, so change it.

Perhaps the function should be changed to return an error-pointer?

> Additionally, move down cma_areas reference code to the position
> where it is really needed.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>

Acked-by: Michal Nazarewicz <mina86@mina86.com>

>
> diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c
> index 28ec226..97613ea 100644
> --- a/arch/powerpc/kvm/book3s_hv_builtin.c
> +++ b/arch/powerpc/kvm/book3s_hv_builtin.c
> @@ -184,7 +184,7 @@ void __init kvm_cma_reserve(void)
>  
>  		align_size = max(kvm_rma_pages << PAGE_SHIFT, align_size);
>  		cma_declare_contiguous(selected_size, 0, 0, align_size,
> -			KVM_CMA_CHUNK_ORDER - PAGE_SHIFT, &kvm_cma, false);
> +			KVM_CMA_CHUNK_ORDER - PAGE_SHIFT, false, &kvm_cma);
>  	}
>  }
>  
> diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
> index f177f73..bfd4553 100644
> --- a/drivers/base/dma-contiguous.c
> +++ b/drivers/base/dma-contiguous.c
> @@ -149,7 +149,7 @@ int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
>  {
>  	int ret;
>  
> -	ret = cma_declare_contiguous(size, base, limit, 0, 0, res_cma, fixed);
> +	ret = cma_declare_contiguous(size, base, limit, 0, 0, fixed, res_cma);
>  	if (ret)
>  		return ret;
>  
> diff --git a/include/linux/cma.h b/include/linux/cma.h
> index e38efe9..e53eead 100644
> --- a/include/linux/cma.h
> +++ b/include/linux/cma.h
> @@ -6,7 +6,7 @@ struct cma;
>  extern int __init cma_declare_contiguous(phys_addr_t size,
>  				phys_addr_t base, phys_addr_t limit,
>  				phys_addr_t alignment, int order_per_bit,
> -				struct cma **res_cma, bool fixed);
> +				bool fixed, struct cma **res_cma);
>  extern struct page *cma_alloc(struct cma *cma, int count, unsigned int align);
>  extern bool cma_release(struct cma *cma, struct page *pages, int count);
>  #endif
> diff --git a/mm/cma.c b/mm/cma.c
> index 01a0713..22a5b23 100644
> --- a/mm/cma.c
> +++ b/mm/cma.c
> @@ -142,8 +142,8 @@ core_initcall(cma_init_reserved_areas);
>   * @limit: End address of the reserved memory (optional, 0 for any).
>   * @alignment: Alignment for the contiguous memory area, should be power of 2
>   * @order_per_bit: Order of pages represented by one bit on bitmap.
> - * @res_cma: Pointer to store the created cma region.
>   * @fixed: hint about where to place the reserved area
> + * @res_cma: Pointer to store the created cma region.
>   *
>   * This function reserves memory from early allocator. It should be
>   * called by arch specific code once the early allocator (memblock or bootmem)
> @@ -156,9 +156,9 @@ core_initcall(cma_init_reserved_areas);
>  int __init cma_declare_contiguous(phys_addr_t size,
>  				phys_addr_t base, phys_addr_t limit,
>  				phys_addr_t alignment, int order_per_bit,
> -				struct cma **res_cma, bool fixed)
> +				bool fixed, struct cma **res_cma)
>  {
> -	struct cma *cma = &cma_areas[cma_area_count];
> +	struct cma *cma;
>  	int ret = 0;
>  
>  	pr_debug("%s(size %lx, base %08lx, limit %08lx alignment %08lx)\n",
> @@ -214,6 +214,7 @@ int __init cma_declare_contiguous(phys_addr_t size,
>  	 * Each reserved area must be initialised later, when more kernel
>  	 * subsystems (like slab allocator) are available.
>  	 */
> +	cma = &cma_areas[cma_area_count];
>  	cma->base_pfn = PFN_DOWN(base);
>  	cma->count = size >> PAGE_SHIFT;
>  	cma->order_per_bit = order_per_bit;
> -- 
> 1.7.9.5
>
Aneesh Kumar K.V - June 14, 2014, 7:20 a.m.
Joonsoo Kim <iamjoonsoo.kim@lge.com> writes:

> Conventionally, we put output param to the end of param list.
> cma_declare_contiguous() doesn't look like that, so change it.
>
> Additionally, move down cma_areas reference code to the position
> where it is really needed.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

>
> diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c
> index 28ec226..97613ea 100644
> --- a/arch/powerpc/kvm/book3s_hv_builtin.c
> +++ b/arch/powerpc/kvm/book3s_hv_builtin.c
> @@ -184,7 +184,7 @@ void __init kvm_cma_reserve(void)
>
>  		align_size = max(kvm_rma_pages << PAGE_SHIFT, align_size);
>  		cma_declare_contiguous(selected_size, 0, 0, align_size,
> -			KVM_CMA_CHUNK_ORDER - PAGE_SHIFT, &kvm_cma, false);
> +			KVM_CMA_CHUNK_ORDER - PAGE_SHIFT, false, &kvm_cma);
>  	}
>  }
>
> diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
> index f177f73..bfd4553 100644
> --- a/drivers/base/dma-contiguous.c
> +++ b/drivers/base/dma-contiguous.c
> @@ -149,7 +149,7 @@ int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
>  {
>  	int ret;
>
> -	ret = cma_declare_contiguous(size, base, limit, 0, 0, res_cma, fixed);
> +	ret = cma_declare_contiguous(size, base, limit, 0, 0, fixed, res_cma);
>  	if (ret)
>  		return ret;
>
> diff --git a/include/linux/cma.h b/include/linux/cma.h
> index e38efe9..e53eead 100644
> --- a/include/linux/cma.h
> +++ b/include/linux/cma.h
> @@ -6,7 +6,7 @@ struct cma;
>  extern int __init cma_declare_contiguous(phys_addr_t size,
>  				phys_addr_t base, phys_addr_t limit,
>  				phys_addr_t alignment, int order_per_bit,
> -				struct cma **res_cma, bool fixed);
> +				bool fixed, struct cma **res_cma);
>  extern struct page *cma_alloc(struct cma *cma, int count, unsigned int align);
>  extern bool cma_release(struct cma *cma, struct page *pages, int count);
>  #endif
> diff --git a/mm/cma.c b/mm/cma.c
> index 01a0713..22a5b23 100644
> --- a/mm/cma.c
> +++ b/mm/cma.c
> @@ -142,8 +142,8 @@ core_initcall(cma_init_reserved_areas);
>   * @limit: End address of the reserved memory (optional, 0 for any).
>   * @alignment: Alignment for the contiguous memory area, should be power of 2
>   * @order_per_bit: Order of pages represented by one bit on bitmap.
> - * @res_cma: Pointer to store the created cma region.
>   * @fixed: hint about where to place the reserved area
> + * @res_cma: Pointer to store the created cma region.
>   *
>   * This function reserves memory from early allocator. It should be
>   * called by arch specific code once the early allocator (memblock or bootmem)
> @@ -156,9 +156,9 @@ core_initcall(cma_init_reserved_areas);
>  int __init cma_declare_contiguous(phys_addr_t size,
>  				phys_addr_t base, phys_addr_t limit,
>  				phys_addr_t alignment, int order_per_bit,
> -				struct cma **res_cma, bool fixed)
> +				bool fixed, struct cma **res_cma)
>  {
> -	struct cma *cma = &cma_areas[cma_area_count];
> +	struct cma *cma;
>  	int ret = 0;
>
>  	pr_debug("%s(size %lx, base %08lx, limit %08lx alignment %08lx)\n",
> @@ -214,6 +214,7 @@ int __init cma_declare_contiguous(phys_addr_t size,
>  	 * Each reserved area must be initialised later, when more kernel
>  	 * subsystems (like slab allocator) are available.
>  	 */
> +	cma = &cma_areas[cma_area_count];
>  	cma->base_pfn = PFN_DOWN(base);
>  	cma->count = size >> PAGE_SHIFT;
>  	cma->order_per_bit = order_per_bit;
> -- 
> 1.7.9.5

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Patch

diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c
index 28ec226..97613ea 100644
--- a/arch/powerpc/kvm/book3s_hv_builtin.c
+++ b/arch/powerpc/kvm/book3s_hv_builtin.c
@@ -184,7 +184,7 @@  void __init kvm_cma_reserve(void)
 
 		align_size = max(kvm_rma_pages << PAGE_SHIFT, align_size);
 		cma_declare_contiguous(selected_size, 0, 0, align_size,
-			KVM_CMA_CHUNK_ORDER - PAGE_SHIFT, &kvm_cma, false);
+			KVM_CMA_CHUNK_ORDER - PAGE_SHIFT, false, &kvm_cma);
 	}
 }
 
diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index f177f73..bfd4553 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c
@@ -149,7 +149,7 @@  int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
 {
 	int ret;
 
-	ret = cma_declare_contiguous(size, base, limit, 0, 0, res_cma, fixed);
+	ret = cma_declare_contiguous(size, base, limit, 0, 0, fixed, res_cma);
 	if (ret)
 		return ret;
 
diff --git a/include/linux/cma.h b/include/linux/cma.h
index e38efe9..e53eead 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -6,7 +6,7 @@  struct cma;
 extern int __init cma_declare_contiguous(phys_addr_t size,
 				phys_addr_t base, phys_addr_t limit,
 				phys_addr_t alignment, int order_per_bit,
-				struct cma **res_cma, bool fixed);
+				bool fixed, struct cma **res_cma);
 extern struct page *cma_alloc(struct cma *cma, int count, unsigned int align);
 extern bool cma_release(struct cma *cma, struct page *pages, int count);
 #endif
diff --git a/mm/cma.c b/mm/cma.c
index 01a0713..22a5b23 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -142,8 +142,8 @@  core_initcall(cma_init_reserved_areas);
  * @limit: End address of the reserved memory (optional, 0 for any).
  * @alignment: Alignment for the contiguous memory area, should be power of 2
  * @order_per_bit: Order of pages represented by one bit on bitmap.
- * @res_cma: Pointer to store the created cma region.
  * @fixed: hint about where to place the reserved area
+ * @res_cma: Pointer to store the created cma region.
  *
  * This function reserves memory from early allocator. It should be
  * called by arch specific code once the early allocator (memblock or bootmem)
@@ -156,9 +156,9 @@  core_initcall(cma_init_reserved_areas);
 int __init cma_declare_contiguous(phys_addr_t size,
 				phys_addr_t base, phys_addr_t limit,
 				phys_addr_t alignment, int order_per_bit,
-				struct cma **res_cma, bool fixed)
+				bool fixed, struct cma **res_cma)
 {
-	struct cma *cma = &cma_areas[cma_area_count];
+	struct cma *cma;
 	int ret = 0;
 
 	pr_debug("%s(size %lx, base %08lx, limit %08lx alignment %08lx)\n",
@@ -214,6 +214,7 @@  int __init cma_declare_contiguous(phys_addr_t size,
 	 * Each reserved area must be initialised later, when more kernel
 	 * subsystems (like slab allocator) are available.
 	 */
+	cma = &cma_areas[cma_area_count];
 	cma->base_pfn = PFN_DOWN(base);
 	cma->count = size >> PAGE_SHIFT;
 	cma->order_per_bit = order_per_bit;