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Subject[PATCH] perf test llvm: Fix f_mode endianness problem
Date
Perf BPF prologue generator unconditionally fetches 8 bytes for function
parameters. On big endian machine, a casting is resquired if the parameter
is not u64.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Thomas Richter <tmricht@linux.vnet.ibm.com>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Li Zefan <lizefan@huawei.com>
---
tools/perf/tests/bpf-script-test-prologue.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/bpf-script-test-prologue.c b/tools/perf/tests/bpf-script-test-prologue.c
index b4ebc75..43f1e16 100644
--- a/tools/perf/tests/bpf-script-test-prologue.c
+++ b/tools/perf/tests/bpf-script-test-prologue.c
@@ -26,9 +26,11 @@ static void (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
(void *) 6;

SEC("func=null_lseek file->f_mode offset orig")
-int bpf_func__null_lseek(void *ctx, int err, unsigned long f_mode,
+int bpf_func__null_lseek(void *ctx, int err, unsigned long _f_mode,
unsigned long offset, unsigned long orig)
{
+ fmode_t f_mode = (fmode_t)_f_mode;
+
if (err)
return 0;
if (f_mode & FMODE_WRITE)
--
2.10.1
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