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gcc 4.3.0 correctly emits the following warnings. When a vma covering addr is found, find_vma_prepare indeed returns without setting pprev, rb_link, and rb_parent. mm/mmap.c: In function `insert_vm_struct': mm/mmap.c:2085: warning: `rb_parent' may be used uninitialized in this function mm/mmap.c:2085: warning: `rb_link' may be used uninitialized in this function mm/mmap.c:2084: warning: `prev' may be used uninitialized in this function mm/mmap.c: In function `copy_vma': mm/mmap.c:2124: warning: `rb_parent' may be used uninitialized in this function mm/mmap.c:2124: warning: `rb_link' may be used uninitialized in this function mm/mmap.c:2123: warning: `prev' may be used uninitialized in this function mm/mmap.c: In function `do_brk': mm/mmap.c:1951: warning: `rb_parent' may be used uninitialized in this function mm/mmap.c:1951: warning: `rb_link' may be used uninitialized in this function mm/mmap.c:1949: warning: `prev' may be used uninitialized in this function mm/mmap.c: In function `mmap_region': mm/mmap.c:1092: warning: `rb_parent' may be used uninitialized in this function mm/mmap.c:1092: warning: `rb_link' may be used uninitialized in this function mm/mmap.c:1089: warning: `prev' may be used uninitialized in this function Hugh adds: in fact, none of find_vma_prepare's callers use those values when a vma is found to be already covering addr, it's either an error or an occasion to munmap and repeat. Okay, let's quieten the compiler (but I would prefer it if pprev, rb_link and rb_parent were meaningful in that case, rather than whatever's in them from descending the tree). Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: "Ryan Hope" <rmh3093@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>