linux-stable/include/linux/shm.h
Stephen Rothwell 8ecd2953d0 ipc/shm: fix up for struct file no longer being available in shm.h
Stephen Rothewell <sfr@canb.auug.org.au> wrote:

> After merging the userns tree, today's linux-next build (powerpc
> ppc64_defconfig) produced this warning:
>
> In file included from include/linux/sched.h:16:0,
>                  from arch/powerpc/lib/xor_vmx_glue.c:14:
> include/linux/shm.h:17:35: error: 'struct file' declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
>  bool is_file_shm_hugepages(struct file *file);
>                                    ^~~~
>
> and many, many more (most warnings, but some errors - arch/powerpc is
> mostly built with -Werror)

I dug through this and I discovered that the error was caused by the
removal of struct shmid_kernel from shm.h when building on powerpc.
Except for observing the existence of "struct file *shm_file" in
struct shmid_kernel I have no clue why the structure move would cause
such a failure.  I suspect shm.h always needed the forward declaration
and someting had been confusing gcc into not issuing the warning. --EWB

Fixes: a2e102cd3c ("shm: Move struct shmid_kernel into ipc/shm.c")
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2018-03-28 13:29:57 -05:00

45 lines
968 B
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SHM_H_
#define _LINUX_SHM_H_
#include <linux/list.h>
#include <asm/page.h>
#include <uapi/linux/shm.h>
#include <asm/shmparam.h>
struct file;
#ifdef CONFIG_SYSVIPC
struct sysv_shm {
struct list_head shm_clist;
};
long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr,
unsigned long shmlba);
bool is_file_shm_hugepages(struct file *file);
void exit_shm(struct task_struct *task);
#define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist)
#else
struct sysv_shm {
/* empty */
};
static inline long do_shmat(int shmid, char __user *shmaddr,
int shmflg, unsigned long *addr,
unsigned long shmlba)
{
return -ENOSYS;
}
static inline bool is_file_shm_hugepages(struct file *file)
{
return false;
}
static inline void exit_shm(struct task_struct *task)
{
}
static inline void shm_init_task(struct task_struct *task)
{
}
#endif
#endif /* _LINUX_SHM_H_ */