[PATCH v3 -next 8/9] mm, CMA: change cma_declare_contiguous() to obey coding convention

Joonsoo Kim
2014-06-16T05:40:50Z

Conventionally, we put output param to the end of param list
and put the 'base' ahead of 'size', but 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.

v3: put 'base' ahead of 'size' (Minchan)

Acked-by: Michal Nazarewicz <mina86@mina86.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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 3960e0b..6cf498a 100644
--- a/arch/powerpc/kvm/book3s_hv_builtin.c
+++ b/arch/powerpc/kvm/book3s_hv_builtin.c
@@ -185,8 +185,8 @@ void __init kvm_cma_reserve(void)
align_size = HPT_ALIGN_PAGES << PAGE_SHIFT;

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);
+ cma_declare_contiguous(0, selected_size, 0, align_size,
+ KVM_CMA_CHUNK_ORDER - PAGE_SHIFT, false, &kvm_cma);
}
}

diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index 0411c1c..6606abd 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c
@@ -165,7 +165,7 @@ 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(base, size, limit, 0, 0, fixed, res_cma);
if (ret)
return ret;

diff --git a/include/linux/cma.h b/include/linux/cma.h
index 69d3726..32cab7a 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -15,7 +15,7 @@ extern unsigned long cma_get_size(struct cma *cma);
extern int __init cma_declare_contiguous(phys_addr_t size,
phys_addr_t base, phys_addr_t limit,
phys_addr_t alignment, unsigned 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 b442a13..9961120 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -141,13 +141,13 @@ core_initcall(cma_init_reserved_areas);

/**
* cma_declare_contiguous() - reserve custom contiguous area
- * @size: Size of the reserved area (in bytes),
* @base: Base address of the reserved area optional, use 0 for any
+ * @size: Size of the reserved area (in bytes),
* @limit: End address of the reserved memory (optional, 0 for any).
* @alignment: Alignment for the CMA area, should be power of 2 or zero
* @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)
@@ -157,12 +157,12 @@ core_initcall(cma_init_reserved_areas);
* If @fixed is true, reserve contiguous area@exactly @base. If false,
* reserve in range from @base to @limit.
*/
-int __init cma_declare_contiguous(phys_addr_t size,
- phys_addr_t base, phys_addr_t limit,
+int __init cma_declare_contiguous(phys_addr_t base,
+ phys_addr_t size, phys_addr_t limit,
phys_addr_t alignment, unsigned 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",
@@ -218,6 +218,7 @@ 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