gnu: strace: Update to 4.23.

* gnu/packages/linux.scm (strace): Update to 4.23.
[source]: Remove obsolete patch.
* gnu/packages/patches/strace-kernel-4.16.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Remove it.

gnu/local.mk

@@ -1112,7 +1112,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/slim-login.patch				\
   %D%/packages/patches/sooperlooper-build-with-wx-30.patch 	\
   %D%/packages/patches/steghide-fixes.patch			\
-  %D%/packages/patches/strace-kernel-4.16.patch			\
   %D%/packages/patches/superlu-dist-scotchmetis.patch		\
   %D%/packages/patches/swish-e-search.patch			\
   %D%/packages/patches/swish-e-format-security.patch		\

gnu/packages/linux.scm

@@ -920,16 +920,15 @@ Zerofree requires the file system to be unmounted or mounted read-only.")
 (define-public strace
   (package
     (name "strace")
-    (version "4.22")
+    (version "4.23")
     (home-page "https://strace.io")
     (source (origin
              (method url-fetch)
              (uri (string-append home-page "/files/" version
                                  "/strace-" version ".tar.xz"))
-             (patches (search-patches "strace-kernel-4.16.patch"))
              (sha256
               (base32
-               "17dkpnsjxmys1ydidm9wcvc3wscsz44fmlxw3dclspn9cj9d1306"))))
+               "1bcsq2gbpcb81ayryvn56a6kjx42fc21la6qgds35n0xbybacq3q"))))
     (build-system gnu-build-system)
     (arguments
      '(#:phases

gnu/packages/patches/strace-kernel-4.16.patch

@@ -1,92 +0,0 @@
-Fix test failure when using Linux-Libre >= 4.16.
-
-Taken from upstream:
-https://github.com/strace/strace/commit/bcff87c31c0f27c678a43d6b7f67dab363a974fa
-
-From bcff87c31c0f27c678a43d6b7f67dab363a974fa Mon Sep 17 00:00:00 2001
-From: Masatake YAMATO <yamato@redhat.com>
-Date: Wed, 2 May 2018 17:11:07 +0900
-Subject: [PATCH] tests/ioctl_kvm_run.c: handle cpuid at the end of vcpu dentry
-
-Since Linux 4.16, kernel appends the cpuid as suffix to the entry
-for a kvm vcpu in /proc/$pid/fd like:
-
-    anon_inode:kvm-vcpu:0
-
-That was
-
-    anon_inode:kvm-vcpu
-
-This kernel change causes the test case failure on newer kernels.
-Update the test to deal with the new name as well as the old one.
-
-* tests/ioctl_kvm_run.c: Include unistd.h for using readlink(2).
-(vcpu_dev_should_have_cpuid): New function for detecting whether
-a proc entry for given fd has the cpuid suffix or not.
-(main): Trim vcpu_dev to remove the cpuid suffix if needed.
-(vcpu_dev): Remove const modifier.
----
- tests/ioctl_kvm_run.c | 29 ++++++++++++++++++++++++++++-
- 1 file changed, 28 insertions(+), 1 deletion(-)
-
-diff --git a/tests/ioctl_kvm_run.c b/tests/ioctl_kvm_run.c
-index 179461430..e1bef5796 100644
---- a/tests/ioctl_kvm_run.c
-+++ b/tests/ioctl_kvm_run.c
-@@ -40,6 +40,7 @@
- # include <string.h>
- # include <sys/ioctl.h>
- # include <sys/mman.h>
-+# include <unistd.h>
- # include <linux/kvm.h>
- 
- static int
-@@ -56,7 +57,7 @@ kvm_ioctl(int fd, unsigned long cmd, const char *cmd_str, void *arg)
- 
- static const char dev[] = "/dev/kvm";
- static const char vm_dev[] = "anon_inode:kvm-vm";
--static const char vcpu_dev[] = "anon_inode:kvm-vcpu";
-+static char vcpu_dev[] = "anon_inode:kvm-vcpu:0";
- static size_t page_size;
- 
- extern const char code[];
-@@ -165,6 +166,23 @@ run_kvm(const int vcpu_fd, struct kvm_run *const run, const size_t mmap_size,
- 	}
- }
- 
-+static int
-+vcpu_dev_should_have_cpuid(int fd)
-+{
-+	int r = 0;
-+	char *filename = NULL;
-+	char buf[sizeof(vcpu_dev)];
-+
-+	if (asprintf(&filename, "/proc/%d/fd/%d", getpid(), fd) < 0)
-+		error_msg_and_fail("asprintf");
-+
-+	if (readlink(filename, buf, sizeof(buf)) == sizeof(buf) - 1
-+	    && (memcmp(buf, vcpu_dev, sizeof(buf) - 1) == 0))
-+		r = 1;
-+	free(filename);
-+	return r;
-+}
-+
- int
- main(void)
- {
-@@ -208,6 +226,15 @@ main(void)
- 	       (unsigned long) page_size, (unsigned long) page_size, mem);
- 
- 	int vcpu_fd = KVM_IOCTL(vm_fd, KVM_CREATE_VCPU, NULL);
-+	if (!vcpu_dev_should_have_cpuid(vcpu_fd))
-+		/*
-+		 * This is an older kernel that doesn't place a cpuid
-+		 * at the end of the dentry associated with vcpu_fd.
-+		 * Trim the cpuid part of vcpu_dev like:
-+		 * "anon_inode:kvm-vcpu:0" -> "anon_inode:kvm-vcpu"
-+		 */
-+		vcpu_dev[strlen (vcpu_dev) - 2] = '\0';
-+
- 	printf("ioctl(%d<%s>, KVM_CREATE_VCPU, 0) = %d<%s>\n",
- 	       vm_fd, vm_dev, vcpu_fd, vcpu_dev);
-