configure: add __kernel_rwf_t check

Signed-off-by: Jens Axboe <[email protected]>

configure

@@ -2295,6 +2295,23 @@ if compile_prog "" "-lcunit" "CUnit"; then
 fi
 print_config "CUnit" "$cunit"
 
+##########################################
+# check for __kernel_rwf_t
+__kernel_rwf_t="no"
+cat > $TMPC << EOF
+#include <linux/fs.h>
+int main(int argc, char **argv)
+{
+  __kernel_rwf_t x;
+  x = 0;
+  return x;
+}
+EOF
+if compile_prog "" "" "__kernel_rwf_t"; then
+  __kernel_rwf_t="yes"
+fi
+print_config "__kernel_rwf_t" "$__kernel_rwf_t"
+
 #############################################################################
 
 if test "$wordsize" = "64" ; then
@@ -2563,6 +2580,9 @@ fi
 if test "$cunit" = "yes" ; then
   output_sym "CONFIG_HAVE_CUNIT"
 fi
+if test "$__kernel_rwf_t" = "yes"; then
+  output_sym "CONFIG_HAVE_KERNEL_RWF_T"
+fi
 
 echo "LIBS+=$LIBS" >> $config_host_mak
 echo "GFIO_LIBS+=$GFIO_LIBS" >> $config_host_mak

engines/io_uring.c

@@ -20,6 +20,7 @@
 
 #ifdef ARCH_HAVE_IOURING
 
+#include "../lib/types.h"
 #include "../os/io_uring.h"
 
 struct io_sq_ring {

lib/types.h

@@ -13,4 +13,8 @@ typedef int bool;
 #include <stdbool.h> /* IWYU pragma: export */
 #endif
 
+#if !defined(CONFIG_HAVE_KERNEL_RWF_T)
+typedef int __kernel_rwf_t;
+#endif
+
 #endif

t/io_uring.c

@@ -21,6 +21,7 @@
 #include <sched.h>
 
 #include "../arch/arch.h"
+#include "../lib/types.h"
 #include "../os/io_uring.h"
 
 #define barrier()	__asm__ __volatile__("": : :"memory")