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Commit 53d74d05 authored by Mark Rutland's avatar Mark Rutland Committed by Catalin Marinas
Browse files

thread_info: factor out restart_block 



Since commit f56141e3 ("all arches, signal: move restart_block
to struct task_struct"), thread_info and restart_block have been
logically distinct, yet struct restart_block is still defined in
<linux/thread_info.h>.

At least one architecture (erroneously) uses restart_block as part of
its thread_info, and thus the definition of restart_block must come
before the include of <asm/thread_info>. Subsequent patches in this
series need to shuffle the order of includes and definitions in
<linux/thread_info.h>, and will make this ordering fragile.

This patch moves the definition of restart_block out to its own header.
This serves as generic cleanup, logically separating thread_info and
restart_block, and also makes it easier to avoid fragility.

Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
Reviewed-by: default avatarAndy Lutomirski <luto@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 09433944

include/linux/restart_block.h

0 → 100644
+51 −0
Original line number Diff line number Diff line 
/*

 * Common syscall restarting data

 */

#ifndef __LINUX_RESTART_BLOCK_H

#define __LINUX_RESTART_BLOCK_H



#include <linux/compiler.h>

#include <linux/types.h>



struct timespec;

struct compat_timespec;

struct pollfd;



/*

 * System call restart block.

 */

struct restart_block {

	long (*fn)(struct restart_block *);

	union {

		/* For futex_wait and futex_wait_requeue_pi */

		struct {

			u32 __user *uaddr;

			u32 val;

			u32 flags;

			u32 bitset;

			u64 time;

			u32 __user *uaddr2;

		} futex;

		/* For nanosleep */

		struct {

			clockid_t clockid;

			struct timespec __user *rmtp;

#ifdef CONFIG_COMPAT

			struct compat_timespec __user *compat_rmtp;

#endif

			u64 expires;

		} nanosleep;

		/* For poll */

		struct {

			struct pollfd __user *ufds;

			int nfds;

			int has_timeout;

			unsigned long tv_sec;

			unsigned long tv_nsec;

		} poll;

	};

};



extern long do_no_restart_syscall(struct restart_block *parm);



#endif /* __LINUX_RESTART_BLOCK_H */

include/linux/thread_info.h

+1 −40
Original line number Diff line number Diff line
@@ -9,51 +9,12 @@ 


#include <linux/types.h>

#include <linux/bug.h>



struct timespec;

struct compat_timespec;

#include <linux/restart_block.h>



#ifdef CONFIG_THREAD_INFO_IN_TASK

#define current_thread_info() ((struct thread_info *)current)

#endif



/*

 * System call restart block.

 */

struct restart_block {

	long (*fn)(struct restart_block *);

	union {

		/* For futex_wait and futex_wait_requeue_pi */

		struct {

			u32 __user *uaddr;

			u32 val;

			u32 flags;

			u32 bitset;

			u64 time;

			u32 __user *uaddr2;

		} futex;

		/* For nanosleep */

		struct {

			clockid_t clockid;

			struct timespec __user *rmtp;

#ifdef CONFIG_COMPAT

			struct compat_timespec __user *compat_rmtp;

#endif

			u64 expires;

		} nanosleep;

		/* For poll */

		struct {

			struct pollfd __user *ufds;

			int nfds;

			int has_timeout;

			unsigned long tv_sec;

			unsigned long tv_nsec;

		} poll;

	};

};



extern long do_no_restart_syscall(struct restart_block *parm);



#include <linux/bitops.h>

#include <asm/thread_info.h>