On 02/04/2021 02:30 AM, Shuah Khan wrote:

On 2/3/21 1:39 AM, Tiezhu Yang wrote:

...

According to the error message, the first argument of ptrace() should be PTRACE_SINGLESTEP instead of PTRACE_CONT when ptrace single step.

Fixes: f43365ee17f8 ("selftests: arm64: add test for unaligned/inexact watchpoint handling") Signed-off-by: Tiezhu Yang yangtiezhu@loongson.cn

---

tools/testing/selftests/breakpoints/breakpoint_test_arm64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c b/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c index ad41ea6..2f4d4d6 100644 --- a/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c +++ b/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c @@ -143,7 +143,7 @@ static bool run_test(int wr_size, int wp_size, int wr, int wp) if (!set_watchpoint(pid, wp_size, wp)) return false;

• if (ptrace(PTRACE_CONT, pid, NULL, NULL) < 0) {

• if (ptrace(PTRACE_SINGLESTEP, pid, NULL, NULL) < 0) { ksft_print_msg( "ptrace(PTRACE_SINGLESTEP) failed: %s\n", strerror(errno));

Right before this it does a set_watchpoint(). PTRACE_CONT is what makes sense to me. Error might be the one that is incorrect here?

What do you think the following change? If it is OK, I will send v2 soon.

diff --git a/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c b/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c index ad41ea6..e704181 100644 --- a/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c +++ b/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c @@ -145,7 +145,7 @@ static bool run_test(int wr_size, int wp_size, int wr, int wp)

if (ptrace(PTRACE_CONT, pid, NULL, NULL) < 0) { ksft_print_msg( - "ptrace(PTRACE_SINGLESTEP) failed: %s\n", + "ptrace(PTRACE_CONT) failed: %s\n", strerror(errno)); return false; } @@ -159,7 +159,7 @@ static bool run_test(int wr_size, int wp_size, int wr, int wp) } alarm(0); if (WIFEXITED(status)) { - ksft_print_msg("child did not single-step\n"); + ksft_print_msg("child exited prematurely\n"); return false; } if (!WIFSTOPPED(status)) {

Thanks, Tiezhu

thanks, -- Shuah