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mm/vmalloc.c: avoid bogus -Wmaybe-uninitialized warning

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gcc gets confused in pcpu_get_vm_areas() because there are too many
branches that affect whether 'lva' was initialized before it gets used:

  mm/vmalloc.c: In function 'pcpu_get_vm_areas':
  mm/vmalloc.c:991:4: error: 'lva' may be used uninitialized in this function [-Werror=maybe-uninitialized]
      insert_vmap_area_augment(lva, &va->rb_node,
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       &free_vmap_area_root, &free_vmap_area_list);
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  mm/vmalloc.c:916:20: note: 'lva' was declared here
    struct vmap_area *lva;
                      ^~~

Add an intialization to NULL, and check whether this has changed before
the first use.

[[email protected]: tweak comments]
Link: http://lkml.kernel.org/r/[email protected]
Fixes: 68ad4a3304 ("mm/vmalloc.c: keep track of free blocks for vmap allocation")
Signed-off-by: Arnd Bergmann <[email protected]>
Reviewed-by: Uladzislau Rezki (Sony) <[email protected]>
Cc: Joel Fernandes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Arnd Bergmann 2019-06-28 12:07:09 -07:00 • committed by Linus Torvalds
commit 2c9292336a
1 changed files with 2 additions and 2 deletions
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4
mm/vmalloc.c
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@ -913,7 +913,7 @@ adjust_va_to_fit_type(struct vmap_area *va,
unsigned long nva_start_addr, unsigned long size,
enum fit_type type)
{
struct vmap_area *lva;
struct vmap_area *lva = NULL;
if (type == FL_FIT_TYPE) {
/*
@ -972,7 +972,7 @@ adjust_va_to_fit_type(struct vmap_area *va,
if (type != FL_FIT_TYPE) {
augment_tree_propagate_from(va);
if (type == NE_FIT_TYPE)
if (lva) /* type == NE_FIT_TYPE */
insert_vmap_area_augment(lva, &va->rb_node,
&free_vmap_area_root, &free_vmap_area_list);
}