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Arnd Bergmann authored
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. [akpm@linux-foundation.org: tweak comments] Link: http://lkml.kernel.org/r/20190618092650.2943749-1-arnd@arndb.de Fixes: 68ad4a33 ("mm/vmalloc.c: keep track of free blocks for vmap allocation") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Cc: Joel Fernandes <joelaf@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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