linux-kernel - [PATCH] mm/vmalloc: Refactoring function __vmalloc_node_range

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Message-Id: <20250306072131.800499-1-liuye@kylinos.cn>
Date: Thu,  6 Mar 2025 15:21:31 +0800
From: Liu Ye <liuye@...inos.cn>
To: akpm@...ux-foundation.org
Cc: urezki@...il.com,
	hch@...radead.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Liu Ye <liuye@...inos.cn>
Subject: [PATCH] mm/vmalloc: Refactoring function __vmalloc_node_range_noprof

According to the code logic, the first parameter of the sub-function
__get_vm_area_node should be size instead of real_size.

Then in the function __get_vm_area_node, the size will be aligned,
so the redundant alignment operation is deleted.

The use of the real_size variable causes code redundancy,
so it is removed to simplify the code.

The real prefix is generally used to indicate the adjusted value of a
parameter, but according to the code logic, it should indicate the
original value, so it is recommended to rename it to original_align.

Signed-off-by: Liu Ye <liuye@...inos.cn>
---
 mm/vmalloc.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index dc658d4af181..a8488452b70b 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -3770,8 +3770,7 @@ void *__vmalloc_node_range_noprof(unsigned long size, unsigned long align,
 	struct vm_struct *area;
 	void *ret;
 	kasan_vmalloc_flags_t kasan_flags = KASAN_VMALLOC_NONE;
-	unsigned long real_size = size;
-	unsigned long real_align = align;
+	unsigned long original_align = align;
 	unsigned int shift = PAGE_SHIFT;
 
 	if (WARN_ON_ONCE(!size))
@@ -3780,7 +3779,7 @@ void *__vmalloc_node_range_noprof(unsigned long size, unsigned long align,
 	if ((size >> PAGE_SHIFT) > totalram_pages()) {
 		warn_alloc(gfp_mask, NULL,
 			"vmalloc error: size %lu, exceeds total pages",
-			real_size);
+			size);
 		return NULL;
 	}
 
@@ -3797,19 +3796,18 @@ void *__vmalloc_node_range_noprof(unsigned long size, unsigned long align,
 		else
 			shift = arch_vmap_pte_supported_shift(size);
 
-		align = max(real_align, 1UL << shift);
-		size = ALIGN(real_size, 1UL << shift);
+		align = max(original_align, 1UL << shift);
 	}
 
 again:
-	area = __get_vm_area_node(real_size, align, shift, VM_ALLOC |
+	area = __get_vm_area_node(size, align, shift, VM_ALLOC |
 				  VM_UNINITIALIZED | vm_flags, start, end, node,
 				  gfp_mask, caller);
 	if (!area) {
 		bool nofail = gfp_mask & __GFP_NOFAIL;
 		warn_alloc(gfp_mask, NULL,
 			"vmalloc error: size %lu, vm_struct allocation failed%s",
-			real_size, (nofail) ? ". Retrying." : "");
+			size, (nofail) ? ". Retrying." : "");
 		if (nofail) {
 			schedule_timeout_uninterruptible(1);
 			goto again;
@@ -3861,7 +3859,7 @@ void *__vmalloc_node_range_noprof(unsigned long size, unsigned long align,
 	    (gfp_mask & __GFP_SKIP_ZERO))
 		kasan_flags |= KASAN_VMALLOC_INIT;
 	/* KASAN_VMALLOC_PROT_NORMAL already set if required. */
-	area->addr = kasan_unpoison_vmalloc(area->addr, real_size, kasan_flags);
+	area->addr = kasan_unpoison_vmalloc(area->addr, size, kasan_flags);
 
 	/*
 	 * In this function, newly allocated vm_struct has VM_UNINITIALIZED
@@ -3870,17 +3868,15 @@ void *__vmalloc_node_range_noprof(unsigned long size, unsigned long align,
 	 */
 	clear_vm_uninitialized_flag(area);
 
-	size = PAGE_ALIGN(size);
 	if (!(vm_flags & VM_DEFER_KMEMLEAK))
-		kmemleak_vmalloc(area, size, gfp_mask);
+		kmemleak_vmalloc(area, PAGE_ALIGN(size), gfp_mask);
 
 	return area->addr;
 
 fail:
 	if (shift > PAGE_SHIFT) {
 		shift = PAGE_SHIFT;
-		align = real_align;
-		size = real_size;
+		align = original_align;
 		goto again;
 	}
 
-- 
2.25.1