[Xen-changelog] [xen master] blktap2: use sys/eventfd.h if it is available

[patchbot@xxxxxxx]

commit b073e110e81bc16d17d4d0bcc40f0137685bbf39
Author:     Ian Campbell <ian.campbell@xxxxxxxxxx>
AuthorDate: Fri Mar 15 13:15:43 2013 +0000
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Thu Apr 11 11:09:25 2013 +0100

    blktap2: use sys/eventfd.h if it is available
    
    arm64 only has the eventfd2 system call and using the libc wrapper when
    available hides this from us. eventfd() has been in libc since glibc 2.8.
    
    This code is already Linux specific.
    
    Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/blktap2/drivers/libaio-compat.h |   12 ++++++++++++
 tools/config.h.in                     |    3 +++
 tools/configure                       |    9 +++++----
 tools/configure.ac                    |    2 +-
 4 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/tools/blktap2/drivers/libaio-compat.h 
b/tools/blktap2/drivers/libaio-compat.h
index 353c36a..47cd96d 100644
--- a/tools/blktap2/drivers/libaio-compat.h
+++ b/tools/blktap2/drivers/libaio-compat.h
@@ -29,6 +29,7 @@
 #ifndef __LIBAIO_COMPAT
 #define __LIBAIO_COMPAT
 
+#include "../../config.h"
 #include <libaio.h>
 #include <unistd.h>
 #include <sys/syscall.h>
@@ -50,6 +51,16 @@ static inline void __io_set_eventfd(struct iocb *iocb, int 
eventfd)
        c->resfd = eventfd;
 }
 
+#ifdef HAVE_SYS_EVENTFD_H
+
+#include <sys/eventfd.h>
+
+static inline int tapdisk_sys_eventfd(int initval)
+{
+       return eventfd(initval, 0);
+}
+
+#else /* Fallback */
 #ifndef SYS_eventfd
 #ifndef __NR_eventfd
 # if defined(__alpha__)
@@ -88,5 +99,6 @@ static inline int tapdisk_sys_eventfd(int initval)
 {
        return syscall(SYS_eventfd, initval, 0);
 }
+#endif
 
 #endif /* __LIBAIO_COMPAT */
diff --git a/tools/config.h.in b/tools/config.h.in
index 08e337a..a67910b 100644
--- a/tools/config.h.in
+++ b/tools/config.h.in
@@ -27,6 +27,9 @@
 /* Define to 1 if you have the <string.h> header file. */
 #undef HAVE_STRING_H
 
+/* Define to 1 if you have the <sys/eventfd.h> header file. */
+#undef HAVE_SYS_EVENTFD_H
+
 /* Define to 1 if you have the <sys/stat.h> header file. */
 #undef HAVE_SYS_STAT_H
 
diff --git a/tools/configure b/tools/configure
index 9f73172..a98dd9e 100755
--- a/tools/configure
+++ b/tools/configure
@@ -7817,12 +7817,13 @@ fi
 
 
 # Checks for header files.
-for ac_header in yajl/yajl_version.h
+for ac_header in yajl/yajl_version.h sys/eventfd.h
 do :
-  ac_fn_c_check_header_mongrel "$LINENO" "yajl/yajl_version.h" 
"ac_cv_header_yajl_yajl_version_h" "$ac_includes_default"
-if test "x$ac_cv_header_yajl_yajl_version_h" = x""yes; then :
+  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" 
"$ac_includes_default"
+if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
   cat >>confdefs.h <<_ACEOF
-#define HAVE_YAJL_YAJL_VERSION_H 1
+#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
 _ACEOF
 
 fi
diff --git a/tools/configure.ac b/tools/configure.ac
index f6e2fec..36a3343 100644
--- a/tools/configure.ac
+++ b/tools/configure.ac
@@ -166,6 +166,6 @@ AC_CHECK_LIB([iconv], [libiconv_open], [libiconv="y"], 
[libiconv="n"])
 AC_SUBST(libiconv)
 
 # Checks for header files.
-AC_CHECK_HEADERS([yajl/yajl_version.h])
+AC_CHECK_HEADERS([yajl/yajl_version.h sys/eventfd.h])
 
 AC_OUTPUT()
--
generated by git-patchbot for /home/xen/git/xen.git#master

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