ltp: syscalls: rt_sigwaitinfo01: Fix failure for MIPS arches

Backport a patch to fix the following failure.
rt_sigtimedwait01    1  TFAIL  :  .../sigwaitinfo01.c:58: test_empty_set
(.../sigwaitinfo01.c: 148): Unexpected failure:
TEST_ERRNO=EINVAL(22): Invalid argument

Signed-off-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 47 insertions, 0 deletions

diff --git a/meta/recipes-extended/ltp/ltp/0001-syscall-rt_sigtimedwait01-Fix-wrong-sigset-length-fo.patch b/meta/recipes-extended/ltp/ltp/0001-syscall-rt_sigtimedwait01-Fix-wrong-sigset-length-fo.patch
new file mode 100644
index 0000000000..0e56c08255
--- /dev/null
+++ b/meta/recipes-extended/ltp/ltp/0001-syscall-rt_sigtimedwait01-Fix-wrong-sigset-length-fo.patch
@@ -0,0 +1,46 @@
+From a5046625eaeed2d3fba456c3ba84c6c141c2ad7c Mon Sep 17 00:00:00 2001
+From: He Zhe <zhe.he@windriver.com>
+Date: Thu, 29 Aug 2019 21:09:46 +0800
+Subject: [PATCH] syscall/rt_sigtimedwait01: Fix wrong sigset length for MIPS
+
+rt_sigtimedwait01 fails as follow on MIPS arches
+rt_sigtimedwait01    1  TFAIL  :  .../sigwaitinfo01.c:58: test_empty_set
+(.../sigwaitinfo01.c: 148): Unexpected failure:
+TEST_ERRNO=EINVAL(22): Invalid argument
+
+As this case purposely bypasses glibc, it should align with the size of kernel
+definition of sigset_t which is different from other arches.
+https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/mips/include/uapi/asm/signal.h#n15
+
+This patch turns to use _NSIG which is always right for all arches.
+
+Upstream-Status: Backport [a5046625eaeed2d3fba456c3ba84c6c141c2ad7c]
+
+Suggested-by: Jan Stancek <jstancek@redhat.com>
+Acked-by: Jan Stancek <jstancek@redhat.com>
+Acked-by: Cyril Hrubis <chrubis@suse.cz>
+Signed-off-by: He Zhe <zhe.he@windriver.com>
+Signed-off-by: Petr Vorel <pvorel@suse.cz>
+---
+ testcases/kernel/syscalls/sigwaitinfo/sigwaitinfo01.c | 5 ++---
+ 1 file changed, 2 insertions(+), 3 deletions(-)
+
+diff --git a/testcases/kernel/syscalls/sigwaitinfo/sigwaitinfo01.c b/testcases/kernel/syscalls/sigwaitinfo/sigwaitinfo01.c
+index 5a32ce1..6a30c27 100644
+--- a/testcases/kernel/syscalls/sigwaitinfo/sigwaitinfo01.c
++++ b/testcases/kernel/syscalls/sigwaitinfo/sigwaitinfo01.c
+@@ -128,9 +128,8 @@ static int my_sigtimedwait(const sigset_t * set, siginfo_t * info,
+ static int my_rt_sigtimedwait(const sigset_t * set, siginfo_t * info,
+ 			      struct timespec *timeout)
+ {
+-
+-	/* The last argument is (number_of_signals)/(bits_per_byte), which are 64 and 8, resp. */
+-	return ltp_syscall(__NR_rt_sigtimedwait, set, info, timeout, 8);
++	/* _NSIG is always the right number of bits of signal map for all arches */
++	return ltp_syscall(__NR_rt_sigtimedwait, set, info, timeout, _NSIG/8);
+ }
+ #endif
+ 
+-- 
+2.7.4
+
diff --git a/meta/recipes-extended/ltp/ltp_20190517.bb b/meta/recipes-extended/ltp/ltp_20190517.bb
index 69d75d5bb8..e9a588f496 100644
--- a/meta/recipes-extended/ltp/ltp_20190517.bb
+++ b/meta/recipes-extended/ltp/ltp_20190517.bb
@@ -47,6 +47,7 @@ SRC_URI = "git://github.com/linux-test-project/ltp.git \
            file://0001-ustat02-Fix-EFAULT-in-32bit-compatibility-mode.patch \
            file://0001-cve-meltdown.c-Fix-kernel-symbol-finding.patch \
            file://0001-testcases-use-python3-everywhere-to-run-python-scrip.patch \
+           file://0001-syscall-rt_sigtimedwait01-Fix-wrong-sigset-length-fo.patch \
            "
 
 S = "${WORKDIR}/git"