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authorLinus Torvalds <torvalds@linux-foundation.org>2015-09-12 05:34:09 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-12 05:34:09 +0300
commit01b0c014eeb0bb857a5dc572cd108be7becddfe7 (patch)
treed6f1a089081aadb09e66add27f7c5137d076ac80 /include
parent3ebb0540c20d6670396ccee9ff6794c095fa9311 (diff)
parente527b22c3f63c02832ac4cb8ed0ec3a9b638bbdf (diff)
downloadlinux-01b0c014eeb0bb857a5dc572cd108be7becddfe7.tar.xz
Merge branch 'akpm' (patches from Andrew)
Merge fourth patch-bomb from Andrew Morton: - sys_membarier syscall - seq_file interface changes - a few misc fixups * emailed patches from Andrew Morton <akpm@linux-foundation.org>: revert "ocfs2/dlm: use list_for_each_entry instead of list_for_each" mm/early_ioremap: add explicit #include of asm/early_ioremap.h fs/seq_file: convert int seq_vprint/seq_printf/etc... returns to void selftests: enhance membarrier syscall test selftests: add membarrier syscall test sys_membarrier(): system-wide memory barrier (generic, x86) MODSIGN: fix a compilation warning in extract-cert
Diffstat (limited to 'include')
-rw-r--r--include/linux/seq_file.h19
-rw-r--r--include/linux/syscalls.h2
-rw-r--r--include/uapi/asm-generic/unistd.h4
-rw-r--r--include/uapi/linux/Kbuild1
-rw-r--r--include/uapi/linux/membarrier.h53
5 files changed, 69 insertions, 10 deletions
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index adeadbd6d7bf..dde00defbaa5 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -114,13 +114,18 @@ int seq_open(struct file *, const struct seq_operations *);
ssize_t seq_read(struct file *, char __user *, size_t, loff_t *);
loff_t seq_lseek(struct file *, loff_t, int);
int seq_release(struct inode *, struct file *);
-int seq_escape(struct seq_file *, const char *, const char *);
-int seq_putc(struct seq_file *m, char c);
-int seq_puts(struct seq_file *m, const char *s);
int seq_write(struct seq_file *seq, const void *data, size_t len);
-__printf(2, 3) int seq_printf(struct seq_file *, const char *, ...);
-__printf(2, 0) int seq_vprintf(struct seq_file *, const char *, va_list args);
+__printf(2, 0)
+void seq_vprintf(struct seq_file *m, const char *fmt, va_list args);
+__printf(2, 3)
+void seq_printf(struct seq_file *m, const char *fmt, ...);
+void seq_putc(struct seq_file *m, char c);
+void seq_puts(struct seq_file *m, const char *s);
+void seq_put_decimal_ull(struct seq_file *m, char delimiter,
+ unsigned long long num);
+void seq_put_decimal_ll(struct seq_file *m, char delimiter, long long num);
+void seq_escape(struct seq_file *m, const char *s, const char *esc);
void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
int rowsize, int groupsize, const void *buf, size_t len,
@@ -138,10 +143,6 @@ int single_release(struct inode *, struct file *);
void *__seq_open_private(struct file *, const struct seq_operations *, int);
int seq_open_private(struct file *, const struct seq_operations *, int);
int seq_release_private(struct inode *, struct file *);
-int seq_put_decimal_ull(struct seq_file *m, char delimiter,
- unsigned long long num);
-int seq_put_decimal_ll(struct seq_file *m, char delimiter,
- long long num);
static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
{
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 08001317aee7..a460e2ef2843 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -885,4 +885,6 @@ asmlinkage long sys_execveat(int dfd, const char __user *filename,
const char __user *const __user *argv,
const char __user *const __user *envp, int flags);
+asmlinkage long sys_membarrier(int cmd, int flags);
+
#endif
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index e016bd9b1a04..8da542a2874d 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -709,9 +709,11 @@ __SYSCALL(__NR_memfd_create, sys_memfd_create)
__SYSCALL(__NR_bpf, sys_bpf)
#define __NR_execveat 281
__SC_COMP(__NR_execveat, sys_execveat, compat_sys_execveat)
+#define __NR_membarrier 282
+__SYSCALL(__NR_membarrier, sys_membarrier)
#undef __NR_syscalls
-#define __NR_syscalls 282
+#define __NR_syscalls 283
/*
* All syscalls below here should go away really,
diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
index 70ff1d9abf0d..f7b2db44eb4b 100644
--- a/include/uapi/linux/Kbuild
+++ b/include/uapi/linux/Kbuild
@@ -252,6 +252,7 @@ header-y += mdio.h
header-y += media.h
header-y += media-bus-format.h
header-y += mei.h
+header-y += membarrier.h
header-y += memfd.h
header-y += mempolicy.h
header-y += meye.h
diff --git a/include/uapi/linux/membarrier.h b/include/uapi/linux/membarrier.h
new file mode 100644
index 000000000000..e0b108bd2624
--- /dev/null
+++ b/include/uapi/linux/membarrier.h
@@ -0,0 +1,53 @@
+#ifndef _UAPI_LINUX_MEMBARRIER_H
+#define _UAPI_LINUX_MEMBARRIER_H
+
+/*
+ * linux/membarrier.h
+ *
+ * membarrier system call API
+ *
+ * Copyright (c) 2010, 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/**
+ * enum membarrier_cmd - membarrier system call command
+ * @MEMBARRIER_CMD_QUERY: Query the set of supported commands. It returns
+ * a bitmask of valid commands.
+ * @MEMBARRIER_CMD_SHARED: Execute a memory barrier on all running threads.
+ * Upon return from system call, the caller thread
+ * is ensured that all running threads have passed
+ * through a state where all memory accesses to
+ * user-space addresses match program order between
+ * entry to and return from the system call
+ * (non-running threads are de facto in such a
+ * state). This covers threads from all processes
+ * running on the system. This command returns 0.
+ *
+ * Command to be passed to the membarrier system call. The commands need to
+ * be a single bit each, except for MEMBARRIER_CMD_QUERY which is assigned to
+ * the value 0.
+ */
+enum membarrier_cmd {
+ MEMBARRIER_CMD_QUERY = 0,
+ MEMBARRIER_CMD_SHARED = (1 << 0),
+};
+
+#endif /* _UAPI_LINUX_MEMBARRIER_H */