mm/vmalloc: invoke classify_va_fit_type() in adjust_va_to_fit_type()

Patch series "Cleanup patches of vmalloc", v2.

Some cleanup patches found when reading vmalloc code.


This patch (of 4):

adjust_va_to_fit_type() checks all values of passed in fit type, including
NOTHING_FIT in the else branch.  However, the check of NOTHING_FIT has
been done inside adjust_va_to_fit_type() and before it's called in all
call sites.

In fact, both of these functions are coupled tightly, since
classify_va_fit_type() is doing the preparation work for
adjust_va_to_fit_type().  So putting invocation of classify_va_fit_type()
inside adjust_va_to_fit_type() can simplify code logic and the redundant
check of NOTHING_FIT issue will go away.

Link: https://lkml.kernel.org/r/20220607105958.382076-1-bhe@redhat.com
Link: https://lkml.kernel.org/r/20220607105958.382076-2-bhe@redhat.comSigned-off-by: Baoquan He <bhe@redhat.com>
Suggested-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/vmalloc.c

@@ -1335,10 +1335,10 @@ classify_va_fit_type(struct vmap_area *va,
 
 static __always_inline int
 adjust_va_to_fit_type(struct vmap_area *va,
-	unsigned long nva_start_addr, unsigned long size,
-	enum fit_type type)
+	unsigned long nva_start_addr, unsigned long size)
 {
 	struct vmap_area *lva = NULL;
+	enum fit_type type = classify_va_fit_type(va, nva_start_addr, size);
 
 	if (type == FL_FIT_TYPE) {
 		/*
@@ -1444,7 +1444,6 @@ __alloc_vmap_area(unsigned long size, unsigned long align,
 	bool adjust_search_size = true;
 	unsigned long nva_start_addr;
 	struct vmap_area *va;
-	enum fit_type type;
 	int ret;
 
 	/*
@@ -1472,14 +1471,9 @@ __alloc_vmap_area(unsigned long size, unsigned long align,
 	if (nva_start_addr + size > vend)
 		return vend;
 
-	/* Classify what we have found. */
-	type = classify_va_fit_type(va, nva_start_addr, size);
-	if (WARN_ON_ONCE(type == NOTHING_FIT))
-		return vend;
-
 	/* Update the free vmap_area. */
-	ret = adjust_va_to_fit_type(va, nva_start_addr, size, type);
-	if (ret)
+	ret = adjust_va_to_fit_type(va, nva_start_addr, size);
+	if (WARN_ON_ONCE(ret))
 		return vend;
 
 #if DEBUG_AUGMENT_LOWEST_MATCH_CHECK
@@ -3735,7 +3729,6 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
 	int area, area2, last_area, term_area;
 	unsigned long base, start, size, end, last_end, orig_start, orig_end;
 	bool purged = false;
-	enum fit_type type;
 
 	/* verify parameters and allocate data structures */
 	BUG_ON(offset_in_page(align) || !is_power_of_2(align));
@@ -3846,15 +3839,11 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
 			/* It is a BUG(), but trigger recovery instead. */
 			goto recovery;
 
-		type = classify_va_fit_type(va, start, size);
-		if (WARN_ON_ONCE(type == NOTHING_FIT))
+		ret = adjust_va_to_fit_type(va, start, size);
+		if (WARN_ON_ONCE(unlikely(ret)))
 			/* It is a BUG(), but trigger recovery instead. */
 			goto recovery;
 
-		ret = adjust_va_to_fit_type(va, start, size, type);
-		if (unlikely(ret))
-			goto recovery;
-
 		/* Allocated area. */
 		va = vas[area];
 		va->va_start = start;