From 53d74d056a4e306a72b8883d325b5d853c0618e6 Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Wed, 19 Oct 2016 19:28:12 +0100 Subject: thread_info: factor out restart_block Since commit f56141e3e2d9aabf ("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 . 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 . Subsequent patches in this series need to shuffle the order of includes and definitions in , 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: Mark Rutland Reviewed-by: Andy Lutomirski Cc: Andrew Morton Cc: Heiko Carstens Cc: Kees Cook Signed-off-by: Catalin Marinas --- include/linux/thread_info.h | 41 +---------------------------------------- 1 file changed, 1 insertion(+), 40 deletions(-) (limited to 'include/linux/thread_info.h') diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h index 2873baf5372a..c75c6ab364ca 100644 --- a/include/linux/thread_info.h +++ b/include/linux/thread_info.h @@ -9,51 +9,12 @@ #include #include - -struct timespec; -struct compat_timespec; +#include #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 #include -- cgit v1.3-7-g2ca7 From dc3d2a679cd8631b8a570fc8ca5f4712d7d25698 Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Wed, 19 Oct 2016 19:28:13 +0100 Subject: thread_info: include for THREAD_INFO_IN_TASK When CONFIG_THREAD_INFO_IN_TASK is selected, the current_thread_info() macro relies on current having been defined prior to its use. However, not all users of current_thread_info() include , and thus current is not guaranteed to be defined. When CONFIG_THREAD_INFO_IN_TASK is not selected, it's possible that get_current() / current are based upon current_thread_info(), and includes . Thus always including would result in circular dependences on some platforms. To ensure both cases work, this patch includes , but only when CONFIG_THREAD_INFO_IN_TASK is selected. Signed-off-by: Mark Rutland Acked-by: Heiko Carstens Reviewed-by: Andy Lutomirski Cc: Andrew Morton Cc: Kees Cook Signed-off-by: Catalin Marinas --- include/linux/thread_info.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/linux/thread_info.h') diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h index c75c6ab364ca..58373875e8ee 100644 --- a/include/linux/thread_info.h +++ b/include/linux/thread_info.h @@ -12,6 +12,12 @@ #include #ifdef CONFIG_THREAD_INFO_IN_TASK +/* + * For CONFIG_THREAD_INFO_IN_TASK kernels we need for the + * definition of current, but for !CONFIG_THREAD_INFO_IN_TASK kernels, + * including can cause a circular dependency on some platforms. + */ +#include #define current_thread_info() ((struct thread_info *)current) #endif -- cgit v1.3-7-g2ca7