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authorMark Rutland <mark.rutland@arm.com>2016-10-19 21:28:12 +0300
committerCatalin Marinas <catalin.marinas@arm.com>2016-11-11 21:24:16 +0300
commit53d74d056a4e306a72b8883d325b5d853c0618e6 (patch)
tree54e53e9bcf3760d91500ff5540b0fc37302904de /include/linux/restart_block.h
parent094339443e6e247254a275ec5e5d8418ad1b2d25 (diff)
downloadlinux-53d74d056a4e306a72b8883d325b5d853c0618e6.tar.xz
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 <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: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Andy 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: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'include/linux/restart_block.h')
-rw-r--r--include/linux/restart_block.h51
1 files changed, 51 insertions, 0 deletions
diff --git a/include/linux/restart_block.h b/include/linux/restart_block.h
new file mode 100644
index 000000000000..0d905d8ec553
--- /dev/null
+++ b/include/linux/restart_block.h
@@ -0,0 +1,51 @@
+/*
+ * 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 */