Some gcc toolchain are optimizing out the memcpy and this causes dax-errors to not trigger the SIG_BUS when doing memcpy on an mmap'd buffer. By moving the buffer to a global variable this bypasses the optimization and allow the test to work as intended.
Signed-off-by: Dave Jiang <[email protected]> --- test/dax-errors.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/test/dax-errors.c b/test/dax-errors.c index 11d0031..9ea5c91 100644 --- a/test/dax-errors.c +++ b/test/dax-errors.c @@ -17,6 +17,8 @@ static sigjmp_buf sj_env; static int sig_count; +/* buf is global in order to avoid gcc memcpy optimization */ +static void *buf; static void sigbus_hdl(int sig, siginfo_t *siginfo, void *ptr) { @@ -27,7 +29,7 @@ static void sigbus_hdl(int sig, siginfo_t *siginfo, void *ptr) static int test_dax_read_err(int fd) { - void *base, *buf; + void *base; int rc = 0; if (fd < 0) { _______________________________________________ Linux-nvdimm mailing list [email protected] https://lists.01.org/mailman/listinfo/linux-nvdimm
