dma: swiotlb: Rename swiotlb_size_or_default()

Rename swiotlb_size_or_default() to swiotlb_default_pool_size() to make
clear that it returns the current size of the default SWIOTLB pool.
This includes changes made by command-line options or sizing heuristics,
not just the compiled-in default.

No functional change.

Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
Link: https://lore.kernel.org/r/20260924060756.1325156-2-aneesh.kumar@kernel.org
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

arch/arm/xen/mm.c

@@ -125,7 +125,7 @@ static int __init xen_mm_init(void)
 		return 0;
 
 	/* we can work with the default swiotlb */
-	rc = swiotlb_init_late(swiotlb_size_or_default(),
+	rc = swiotlb_init_late(swiotlb_default_pool_size(),
 			       xen_swiotlb_gfp(), NULL);
 	if (rc < 0)
 		return rc;

arch/arm64/mm/init.c

@@ -348,7 +348,7 @@ void __init arch_mm_preinit(void)
 		unsigned long size =
 			DIV_ROUND_UP(memblock_phys_mem_size(), 1024);
 
-		swiotlb_adjust_size(min(swiotlb_size_or_default(), size));
+		swiotlb_adjust_size(min(swiotlb_default_pool_size(), size));
 	}
 
 	swiotlb_init(true, flags);

arch/riscv/mm/init.c

@@ -185,7 +185,7 @@ void __init arch_mm_preinit(void)
 		 */
 		unsigned long size =
 			DIV_ROUND_UP(memblock_phys_mem_size(), 1024);
-		swiotlb_adjust_size(min(swiotlb_size_or_default(), size));
+		swiotlb_adjust_size(min(swiotlb_default_pool_size(), size));
 		swiotlb = true;
 		swiotlb_flags |= SWIOTLB_ANY;
 	}

arch/x86/include/asm/crash_reserve.h

@@ -18,7 +18,7 @@
  * no good way to detect the paging mode of the target kernel which will be
  * loaded for dumping.
  */
-extern unsigned long swiotlb_size_or_default(void);
+extern unsigned long swiotlb_default_pool_size(void);
 
 #ifdef CONFIG_X86_32
 # define CRASH_ADDR_LOW_MAX     SZ_512M
@@ -33,7 +33,7 @@ extern unsigned long swiotlb_size_or_default(void);
 static inline unsigned long crash_low_size_default(void)
 {
 #ifdef CONFIG_X86_64
-	return max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
+	return max(swiotlb_default_pool_size() + (8UL << 20), 256UL << 20);
 #else
 	return 0;
 #endif

include/linux/swiotlb.h

@@ -38,7 +38,7 @@ struct scatterlist;
 #define IO_TLB_DEFAULT_SIZE (64UL << 20)
 #endif
 
-unsigned long swiotlb_size_or_default(void);
+unsigned long swiotlb_default_pool_size(void);
 void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
 	int (*remap)(void *tlb, unsigned long nslabs));
 int swiotlb_init_late(size_t size, gfp_t gfp_mask,

kernel/dma/swiotlb.c

@@ -285,7 +285,7 @@ setup_io_tlb_npages(char *str)
 }
 early_param("swiotlb", setup_io_tlb_npages);
 
-unsigned long swiotlb_size_or_default(void)
+unsigned long swiotlb_default_pool_size(void)
 {
 	return default_nslabs << IO_TLB_SHIFT;
 }