sparc64: don't treat 64-bit syscall return codes as 32-bit
authorDave Kleikamp <dave.kleikamp@oracle.com>
Fri, 14 Mar 2014 15:42:01 +0000 (10:42 -0500)
committerDavid S. Miller <davem@davemloft.net>
Mon, 17 Mar 2014 19:54:52 +0000 (15:54 -0400)
commit1535bd8adbdedd60a0ee62e28fd5225d66434371
tree6797e19f2f4362fdaf5a38d95b87aba771a21b23
parente58e241c1788856f69d58821e91e5c988905252d
sparc64: don't treat 64-bit syscall return codes as 32-bit

When checking a system call return code for an error,
linux_sparc_syscall was sign-extending the lower 32-bit value and
comparing it to -ERESTART_RESTARTBLOCK. lseek can return valid return
codes whose lower 32-bits alone would indicate a failure (such as 4G-1).
Use the whole 64-bit value to check for errors. Only the 32-bit path
should sign extend the lower 32-bit value.

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Acked-by: Bob Picco <bob.picco@oracle.com>
Acked-by: Allen Pais <allen.pais@oracle.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
arch/sparc/kernel/syscalls.S