Re: Update kernel-features.h files for Linux 5.1

[Joseph Myers <joseph at codesourcery dot com>]

On Fri, 10 May 2019, Stepan Golosunov wrote:

> The newly added direct ipc syscalls are different from the old ones:

Thanks for pointing this out.  Here's a revised patch version with the 
__ASSUME_DIRECT_SYSVIPC_SYSCALLS changes removed.


Update kernel-features.h files for Linux 5.1.

Linux 5.1 adds missing syscalls to the syscall table for many Linux
kernel architectures.  This patch updates the kernel-features.h
headers accordingly.  __ASSUME_DIRECT_SYSVIPC_SYSCALLS is not updated
because of the differences between new and old syscalls described in
<https://sourceware.org/ml/libc-alpha/2019-05/msg00235.html>.  I
believe the statfs64 structure used by alpha matches what the new
kernel syscalls use, but that should be reviewed carefully.

Tested with build-many-glibcs.py.

2019-05-13  Joseph Myers  <joseph@codesourcery.com>

	* sysdeps/unix/sysv/linux/alpha/kernel-features.h
	(__ASSUME_STATFS64): Only undefine if [__LINUX_KERNEL_VERSION <
	0x050100].
	* sysdeps/unix/sysv/linux/ia64/kernel-features.h (__ASSUME_STATX):
	Likewise.
	* sysdeps/unix/sysv/linux/sh/kernel-features.h
	(__ASSUME_STATX): Likewise.

diff --git a/sysdeps/unix/sysv/linux/alpha/kernel-features.h b/sysdeps/unix/sysv/linux/alpha/kernel-features.h
index f3298b234e..4a5d029c1d 100644
--- a/sysdeps/unix/sysv/linux/alpha/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/alpha/kernel-features.h
@@ -22,9 +22,11 @@
 
 #include_next <kernel-features.h>
 
-/* There never has been support for fstat64.  */
-#undef __ASSUME_STATFS64
-#define __ASSUME_STATFS64 0
+/* Support for statfs64 was added in 5.1.  */
+#if __LINUX_KERNEL_VERSION < 0x050100
+# undef __ASSUME_STATFS64
+# define __ASSUME_STATFS64 0
+#endif
 
 /* Alpha used to define SysV ipc shmat syscall with a different name.  */
 #ifndef __NR_shmat
diff --git a/sysdeps/unix/sysv/linux/ia64/kernel-features.h b/sysdeps/unix/sysv/linux/ia64/kernel-features.h
index 0f4948b8e0..333947931d 100644
--- a/sysdeps/unix/sysv/linux/ia64/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/ia64/kernel-features.h
@@ -26,8 +26,10 @@
 #define __ASSUME_SEND_SYSCALL		1
 #define __ASSUME_ACCEPT4_SYSCALL	1
 
-/* No statx system call on ia64 yet.  */
-#undef __ASSUME_STATX
+/* Support for statx was added in 5.1.  */
+#if __LINUX_KERNEL_VERSION < 0x050100
+# undef __ASSUME_STATX
+#endif
 
 #undef __ASSUME_CLONE_DEFAULT
 #define __ASSUME_CLONE2
diff --git a/sysdeps/unix/sysv/linux/sh/kernel-features.h b/sysdeps/unix/sysv/linux/sh/kernel-features.h
index 767df721b8..b11a5cb544 100644
--- a/sysdeps/unix/sysv/linux/sh/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/sh/kernel-features.h
@@ -52,7 +52,9 @@
 # undef __ASSUME_COPY_FILE_RANGE
 #endif
 
-/* sh does not support the statx system call.  */
-#undef __ASSUME_STATX
+/* sh does not support the statx system call before 5.1.  */
+#if __LINUX_KERNEL_VERSION < 0x050100
+# undef __ASSUME_STATX
+#endif
 
 #endif

-- 
Joseph S. Myers
joseph@codesourcery.com