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compat: let architectures define __ARCH_WANT_COMPAT_SYS_GETDENTS64

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For architecture dependent compat syscalls in common code an architecture
must define something like __ARCH_WANT_<WHATEVER> if it wants to use the
code.
This however is not true for compat_sys_getdents64 for which architectures
must define __ARCH_OMIT_COMPAT_SYS_GETDENTS64 if they do not want the code.

This leads to the situation where all architectures, except mips, get the
compat code but only x86_64, arm64 and the generic syscall architectures
actually use it.

So invert the logic, so that architectures actively must do something to
get the compat code.

This way a couple of architectures get rid of otherwise dead code.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Heiko Carstens 2014-03-03 10:44:03 +01:00
parent 0414855fdc
commit 0473c9b5f0
6 changed files with 7 additions and 3 deletions
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2
include/linux/compat.h
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@ -502,9 +502,11 @@ asmlinkage long compat_sys_old_readdir(unsigned int fd,
asmlinkage long compat_sys_getdents(unsigned int fd,
struct compat_linux_dirent __user *dirent,
unsigned int count);
#ifdef __ARCH_WANT_COMPAT_SYS_GETDENTS64
asmlinkage long compat_sys_getdents64(unsigned int fd,
struct linux_dirent64 __user *dirent,
unsigned int count);
#endif
asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
unsigned int nr_segs, unsigned int flags);
asmlinkage long compat_sys_open(const char __user *filename, int flags,