Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1

[Borislav Petkov]

And,

I haven't even wished for it but just to prove everybody my point: just
built rc4+ from Linus' repo with gcc 4.9.0, see below.

Now all of a sudden there's more noise, maybe because this is a
different .config. However, I doubt those are real bugs.

A cursory look through those shows that they're not really bugs -
gcc simply can't know with all the ifdeffery, partial usage based on
conditionals, etc, etc.

---
In file included from scripts/sortextable.c:194:0:
scripts/sortextable.c: In function âmainâ:
scripts/sortextable.h:176:3: warning: ârelocs_sizeâ may be used uninitialized in this function [-Wmaybe-uninitialized]
   memset(relocs, 0, relocs_size);
   ^
scripts/sortextable.h:106:6: note: ârelocs_sizeâ was declared here
  int relocs_size;
      ^
In file included from scripts/sortextable.c:192:0:
scripts/sortextable.h:176:3: warning: ârelocs_sizeâ may be used uninitialized in this function [-Wmaybe-uninitialized]
   memset(relocs, 0, relocs_size);
   ^
scripts/sortextable.h:106:6: note: ârelocs_sizeâ was declared here
  int relocs_size;
      ^
fs/namespace.c: In function âSyS_mountâ:
fs/namespace.c:2647:8: warning: âkernel_devâ may be used uninitialized in this function [-Wmaybe-uninitialized]
  ret = do_mount(kernel_dev, kernel_dir->name, kernel_type, flags,
        ^
fs/namespace.c:2626:8: note: âkernel_devâ was declared here
  char *kernel_dev;
        ^
fs/namespace.c:2647:8: warning: âkernel_typeâ may be used uninitialized in this function [-Wmaybe-uninitialized]
  ret = do_mount(kernel_dev, kernel_dir->name, kernel_type, flags,
        ^
fs/namespace.c:2624:8: note: âkernel_typeâ was declared here
  char *kernel_type;
        ^
fs/direct-io.c: In function âdo_blockdev_direct_IOâ:
fs/direct-io.c:920:9: warning: âtoâ may be used uninitialized in this function [-Wmaybe-uninitialized]
   while (from < to) {
         ^
fs/direct-io.c:913:16: note: âtoâ was declared here
   size_t from, to;
                ^
fs/direct-io.c:1034:9: warning: âfromâ may be used uninitialized in this function [-Wmaybe-uninitialized]
    from += this_chunk_bytes;
         ^
fs/direct-io.c:913:10: note: âfromâ was declared here
   size_t from, to;
          ^
In file included from include/net/inetpeer.h:15:0,
                 from net/ipv4/tcp_metrics.c:16:
net/ipv4/tcp_metrics.c: In function âtcp_peer_is_provenâ:
include/net/ipv6.h:422:38: warning: â*((void *)&daddr+8)â may be used uninitialized in this function [-Wmaybe-uninitialized]
  return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
                                      ^
net/ipv4/tcp_metrics.c:231:30: note: â*((void *)&daddr+8)â was declared here
  struct inetpeer_addr saddr, daddr;
                              ^
In file included from include/net/inetpeer.h:15:0,
                 from net/ipv4/tcp_metrics.c:16:
include/net/ipv6.h:422:38: warning: â*((void *)&saddr+8)â may be used uninitialized in this function [-Wmaybe-uninitialized]
  return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
                                      ^
net/ipv4/tcp_metrics.c:231:23: note: â*((void *)&saddr+8)â was declared here
  struct inetpeer_addr saddr, daddr;
                       ^

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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