Merge tag 'linux-kselftest-5.3-rc1' of...

Merge tag 'linux-kselftest-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull Kselftest updates from Shuah Khan:
 "This Kselftest update for Linux 5.3-rc1 consists of build failure
  fixes and minor code cleaning patch to remove duplicate headers"

* tag 'linux-kselftest-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
  rseq/selftests: Fix Thumb mode build failure on arm32
  kselftests: cgroup: remove duplicated include from test_freezer.c
  selftests: timestamping: Fix SIOCGSTAMP undeclared build failure
  selftests: dma-buf: Adding kernel config fragment CONFIG_UDMABUF=y

tools/testing/selftests/cgroup/test_freezer.c

@@ -11,7 +11,6 @@
 #include <stdlib.h>
 #include <sys/inotify.h>
 #include <string.h>
-#include <sys/types.h>
 #include <sys/wait.h>
 
 #include "../kselftest.h"

tools/testing/selftests/drivers/dma-buf/config

+CONFIG_UDMABUF=y

tools/testing/selftests/networking/timestamping/timestamping.c

@@ -32,6 +32,7 @@
 #include <asm/types.h>
 #include <linux/net_tstamp.h>
 #include <linux/errqueue.h>
+#include <linux/sockios.h>
 
 #ifndef SO_TIMESTAMPING
 # define SO_TIMESTAMPING         37
@@ -42,14 +43,6 @@
 # define SO_TIMESTAMPNS 35
 #endif
 
-#ifndef SIOCGSTAMPNS
-# define SIOCGSTAMPNS 0x8907
-#endif
-
-#ifndef SIOCSHWTSTAMP
-# define SIOCSHWTSTAMP 0x89b0
-#endif
-
 static void usage(const char *error)
 {
 	if (error)

tools/testing/selftests/rseq/rseq-arm.h

@@ -6,6 +6,8 @@
  */
 
 /*
+ * - ARM little endian
+ *
  * RSEQ_SIG uses the udf A32 instruction with an uncommon immediate operand
  * value 0x5de3. This traps if user-space reaches this instruction by mistake,
  * and the uncommon operand ensures the kernel does not move the instruction
@@ -22,36 +24,40 @@
  * def3        udf    #243      ; 0xf3
  * e7f5        b.n    <7f5>
  *
- * pre-ARMv6 big endian code:
- * e7f5        b.n    <7f5>
- * def3        udf    #243      ; 0xf3
+ * - ARMv6+ big endian (BE8):
  *
  * ARMv6+ -mbig-endian generates mixed endianness code vs data: little-endian
- * code and big-endian data. Ensure the RSEQ_SIG data signature matches code
- * endianness. Prior to ARMv6, -mbig-endian generates big-endian code and data
- * (which match), so there is no need to reverse the endianness of the data
- * representation of the signature. However, the choice between BE32 and BE8
- * is done by the linker, so we cannot know whether code and data endianness
- * will be mixed before the linker is invoked.
+ * code and big-endian data. The data value of the signature needs to have its
+ * byte order reversed to generate the trap instruction:
+ *
+ * Data: 0xf3def5e7
+ *
+ * Translates to this A32 instruction pattern:
+ *
+ * e7f5def3    udf    #24035    ; 0x5de3
+ *
+ * Translates to this T16 instruction pattern:
+ *
+ * def3        udf    #243      ; 0xf3
+ * e7f5        b.n    <7f5>
+ *
+ * - Prior to ARMv6 big endian (BE32):
+ *
+ * Prior to ARMv6, -mbig-endian generates big-endian code and data
+ * (which match), so the endianness of the data representation of the
+ * signature should not be reversed. However, the choice between BE32
+ * and BE8 is done by the linker, so we cannot know whether code and
+ * data endianness will be mixed before the linker is invoked. So rather
+ * than try to play tricks with the linker, the rseq signature is simply
+ * data (not a trap instruction) prior to ARMv6 on big endian. This is
+ * why the signature is expressed as data (.word) rather than as
+ * instruction (.inst) in assembler.
  */
 
-#define RSEQ_SIG_CODE	0xe7f5def3
-
-#ifndef __ASSEMBLER__
-
-#define RSEQ_SIG_DATA							\
-	({								\
-		int sig;						\
-		asm volatile ("b 2f\n\t"				\
-			      "1: .inst " __rseq_str(RSEQ_SIG_CODE) "\n\t" \
-			      "2:\n\t"					\
-			      "ldr %[sig], 1b\n\t"			\
-			      : [sig] "=r" (sig));			\
-		sig;							\
-	})
-
-#define RSEQ_SIG	RSEQ_SIG_DATA
-
+#ifdef __ARMEB__
+#define RSEQ_SIG    0xf3def5e7      /* udf    #24035    ; 0x5de3 (ARMv6+) */
+#else
+#define RSEQ_SIG    0xe7f5def3      /* udf    #24035    ; 0x5de3 */
 #endif
 
 #define rseq_smp_mb()	__asm__ __volatile__ ("dmb" ::: "memory", "cc")
@@ -125,8 +131,7 @@ do {									\
 		__rseq_str(table_label) ":\n\t"				\
 		".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
 		".word " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) ", 0x0\n\t" \
-		".arm\n\t"						\
-		".inst " __rseq_str(RSEQ_SIG_CODE) "\n\t"		\
+		".word " __rseq_str(RSEQ_SIG) "\n\t"			\
 		__rseq_str(label) ":\n\t"				\
 		teardown						\
 		"b %l[" __rseq_str(abort_label) "]\n\t"