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[PATCH] kernel-features.h updates


Hi!

After noticing that even --enable-kernel=2.6.22 x86_64 glibc doesn't
assume ppoll/pselect6 syscalls, I decided to skim recent patch-2.6.NN.bz2
and patch-2.6.NN-rc1.bz2 asm-*/unistd.h additions to see when exactly were
recent syscalls introduced.

2007-08-13  Jakub Jelinek  <jakub@redhat.com>

	* sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_PSELECT,
	__ASSUME_PPOLL, __ASSUME_ATFCTS, __ASSUME_SET_ROBUST_LIST,
	__ASSUME_UTIMENSAT, __ASSUME_FALLOCATE): Update per-arch conditions
	when each feature was introduced.
	
--- libc/sysdeps/unix/sysv/linux/kernel-features.h.jj	2007-07-24 10:50:57.000000000 +0200
+++ libc/sysdeps/unix/sysv/linux/kernel-features.h	2007-08-13 17:11:29.000000000 +0200
@@ -428,29 +428,37 @@
 # define __ASSUME_TMPFS_NAME	1
 #endif
 
-/* pselect was introduced just after 2.6.16-rc1.  Due to the way the
-   kernel versions are advertised we can only rely on 2.6.17 to have
-   the code.  */
-#if __LINUX_KERNEL_VERSION >= 0x020611 && !defined __x86_64__
+/* pselect/ppoll were introduced just after 2.6.16-rc1.  Due to the way
+   the kernel versions are advertised we can only rely on 2.6.17 to have
+   the code.  On x86_64 and SH this appeared first in 2.6.19-rc1,
+   on ia64 in 2.6.22-rc1 and on alpha just after 2.6.22-rc1.  */
+#if __LINUX_KERNEL_VERSION >= 0x020611 \
+    && ((!defined __x86_64__ && !defined __sh__ && !defined __ia64__ \
+	 && !defined __alpha__) \
+	|| (__LINUX_KERNEL_VERSION >= 0x020613 \
+	    && (defined __x86_64__ || defined __sh__)) \
+	|| (__LINUX_KERNEL_VERSION >= 0x020616 && defined __ia64__) \
+	|| (__LINUX_KERNEL_VERSION >= 0x020617 && defined __alpha__))
 # define __ASSUME_PSELECT	1
-#endif
-
-/* ppoll was introduced just after 2.6.16-rc1.  Due to the way the
-   kernel versions are advertised we can only rely on 2.6.17 to have
-   the code.  */
-#if __LINUX_KERNEL_VERSION >= 0x020611 && !defined __x86_64__
-# define __ASSUME_PPOLL	1
+# define __ASSUME_PPOLL		1
 #endif
 
 /* The *at syscalls were introduced just after 2.6.16-rc1.  Due to the way the
    kernel versions are advertised we can only rely on 2.6.17 to have
-   the code.  */
-#if __LINUX_KERNEL_VERSION >= 0x020611
+   the code.  On PPC they were introduced in 2.6.17-rc1, on SH in 2.6.19-rc1
+   and on Alpha just after 2.6.22-rc1.  */
+#if __LINUX_KERNEL_VERSION >= 0x020611 \
+    && ((!defined __sh__ && !defined __alpha__) \
+	|| (__LINUX_KERNEL_VERSION >= 0x020613 && defined __sh__) \
+	|| (__LINUX_KERNEL_VERSION >= 0x020617 && defined __alpha__))
 # define __ASSUME_ATFCTS	1
 #endif
 
 /* Support for inter-process robust mutexes was added in 2.6.17.  */
-#if __LINUX_KERNEL_VERSION >= 0x020611
+#if __LINUX_KERNEL_VERSION >= 0x020611 \
+    && ((!defined __sh__ && !defined __alpha__) \
+	|| (__LINUX_KERNEL_VERSION >= 0x020613 && defined __sh__) \
+	|| (__LINUX_KERNEL_VERSION >= 0x020617 && defined __alpha__))
 # define __ASSUME_SET_ROBUST_LIST	1
 #endif
 
@@ -459,8 +467,11 @@
 # define __ASSUME_FUTEX_LOCK_PI	1
 #endif
 
-/* Support for utimensat syscall was added in 2.6.22.  */
-#if __LINUX_KERNEL_VERSION >= 0x020616
+/* Support for utimensat syscall was added in 2.6.22, on alpha and s390
+   only after 2.6.22-rc1.  */
+#if __LINUX_KERNEL_VERSION >= 0x020616 \
+    && ((!defined __sh__ && !defined __alpha__) \
+	|| __LINUX_KERNEL_VERSION >= 0x020617)
 # define __ASSUME_UTIMENSAT	1
 #endif
 
@@ -469,7 +480,10 @@
 # define __ASSUME_PRIVATE_FUTEX	1
 #endif
 
-/* Support for fallocate was added in 2.6.23.  */
-#if __LINUX_KERNEL_VERSION >= 0x020617
+/* Support for fallocate was added in 2.6.23, on s390
+   only after 2.6.23-rc1.  */
+#if __LINUX_KERNEL_VERSION >= 0x020617 \
+    && ((!defined __s390__ && !defined __alpha__) \
+	|| (__LINUX_KERNEL_VERSION >= 0x020618 && defined __s390__))
 # define __ASSUME_FALLOCATE	1
 #endif

	Jakub


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