[Fuego] [PATCH] Benchmark.lmbench2: fix lmbench compile issue

From: venkata pyla <[email protected]>

The test is failing in fuego buster during build phase, it is due to
the llseek function is no more available from glibc version 2.28,
instead use the lseek64 function.

```
/usr/bin/ld: /tmp/ccUq4xrV.o: in function `seekto':
disk.c:(.text+0x2f): undefined reference to `llseek'
collect2: error: ld returned 1 exit status
```
created a patch for lmbench3 source to fix the above issue,
and applied during build phase.

Signed-off-by: venkata pyla <[email protected]>
---
 .../fix-undefined-reference-llseek.patch      | 24 +++++++++++++++++++
 tests/Benchmark.lmbench2/fuego_test.sh        |  5 ++++
 2 files changed, 29 insertions(+)
 create mode 100755 tests/Benchmark.lmbench2/fix-undefined-reference-llseek.patch

diff --git a/tests/Benchmark.lmbench2/fix-undefined-reference-llseek.patch b/tests/Benchmark.lmbench2/fix-undefined-reference-llseek.patch
new file mode 100755
index 0000000..99070f8
--- /dev/null
+++ b/tests/Benchmark.lmbench2/fix-undefined-reference-llseek.patch
@@ -0,0 +1,24 @@
+--- disk.c	2021-08-02 23:59:04.976884974 +0530
++++ disk_new.c	2021-08-03 00:01:11.952696624 +0530
+@@ -7,6 +7,10 @@
+  * Bits of this are derived from work by Ethan Solomita.
+  */
+ 
++#ifdef __linux__
++#define _LARGEFILE64_SOURCE
++#endif
++
+ #include	<stdio.h>
+ #include	<sys/types.h>
+ #include	<unistd.h>
+@@ -289,9 +293,7 @@
+ seekto(int fd, uint64 off)
+ {
+ #ifdef	__linux__
+-	extern	loff_t llseek(int, loff_t, int);
+-
+-	if (llseek(fd, (loff_t)off, SEEK_SET) == (loff_t)-1) {
++	if (lseek64(fd, (off64_t)off, SEEK_SET) == (off64_t)-1) {
+ 		return(-1);
+ 	}
+ 	return (0);
diff --git a/tests/Benchmark.lmbench2/fuego_test.sh b/tests/Benchmark.lmbench2/fuego_test.sh
index 9bdf0d2..d07606c 100755
--- a/tests/Benchmark.lmbench2/fuego_test.sh
+++ b/tests/Benchmark.lmbench2/fuego_test.sh
@@ -9,6 +9,7 @@ function test_build {
    patch -p0 < $TEST_HOME/lmbench3.mem64.patch
    cd ../src
    patch -p0 < $TEST_HOME/bench.h.patch
+   patch -p0 < $TEST_HOME/fix-undefined-reference-llseek.patch
    cd ..
    CFLAGS+=" -g -O"
    export OS=$PREFIX
@@ -25,7 +26,11 @@ function test_run {
    if [ -n "$PREFIX" ] ; then
       LMBENCH_OS=`ls ./bin`
    else
+      LMBENCH_OS=`ls ./bin`
+      echo "lmbench_os: $LMBENCH_OS"
+      echo "curr path: $(pwd)"
       LMBENCH_OS=$(scripts/os)
+      echo "lmbench_os: $LMBENCH_OS"
    fi
    safe_cmd "rm -rf $BOARD_TESTDIR/fuego.$TESTDIR/results"
    safe_cmd "cd $BOARD_TESTDIR/fuego.$TESTDIR/scripts; OS=$LMBENCH_OS ./config-run"
-- 
2.20.1