diff --git a/debuggerd/crasher/crasher.cpp b/debuggerd/crasher/crasher.cpp
index 6a19878..12ba502 100644
--- a/debuggerd/crasher/crasher.cpp
+++ b/debuggerd/crasher/crasher.cpp
@@ -148,7 +148,7 @@
 noinline void leak() {
     while (true) {
         void* mapping =
-            mmap(nullptr, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+            mmap(nullptr, getpagesize(), PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
         static_cast<volatile char*>(mapping)[0] = 'a';
     }
 }
diff --git a/debuggerd/debuggerd_test.cpp b/debuggerd/debuggerd_test.cpp
index 4cd6193..52c1c25 100644
--- a/debuggerd/debuggerd_test.cpp
+++ b/debuggerd/debuggerd_test.cpp
@@ -300,24 +300,7 @@
 }
 
 static void ConsumeFd(unique_fd fd, std::string* output) {
-  constexpr size_t read_length = PAGE_SIZE;
-  std::string result;
-
-  while (true) {
-    size_t offset = result.size();
-    result.resize(result.size() + PAGE_SIZE);
-    ssize_t rc = TEMP_FAILURE_RETRY(read(fd.get(), &result[offset], read_length));
-    if (rc == -1) {
-      FAIL() << "read failed: " << strerror(errno);
-    } else if (rc == 0) {
-      result.resize(result.size() - PAGE_SIZE);
-      break;
-    }
-
-    result.resize(result.size() - PAGE_SIZE + rc);
-  }
-
-  *output = std::move(result);
+  ASSERT_TRUE(android::base::ReadFdToString(fd, output));
 }
 
 class LogcatCollector {
diff --git a/debuggerd/handler/debuggerd_handler.cpp b/debuggerd/handler/debuggerd_handler.cpp
index c6a535a..1e5365d 100644
--- a/debuggerd/handler/debuggerd_handler.cpp
+++ b/debuggerd/handler/debuggerd_handler.cpp
@@ -721,19 +721,19 @@
   }
 
   size_t thread_stack_pages = 8;
-  void* thread_stack_allocation = mmap(nullptr, PAGE_SIZE * (thread_stack_pages + 2), PROT_NONE,
+  void* thread_stack_allocation = mmap(nullptr, getpagesize() * (thread_stack_pages + 2), PROT_NONE,
                                        MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
   if (thread_stack_allocation == MAP_FAILED) {
     fatal_errno("failed to allocate debuggerd thread stack");
   }
 
-  char* stack = static_cast<char*>(thread_stack_allocation) + PAGE_SIZE;
-  if (mprotect(stack, PAGE_SIZE * thread_stack_pages, PROT_READ | PROT_WRITE) != 0) {
+  char* stack = static_cast<char*>(thread_stack_allocation) + getpagesize();
+  if (mprotect(stack, getpagesize() * thread_stack_pages, PROT_READ | PROT_WRITE) != 0) {
     fatal_errno("failed to mprotect debuggerd thread stack");
   }
 
   // Stack grows negatively, set it to the last byte in the page...
-  stack = (stack + thread_stack_pages * PAGE_SIZE - 1);
+  stack = (stack + thread_stack_pages * getpagesize() - 1);
   // and align it.
   stack -= 15;
   pseudothread_stack = stack;
diff --git a/debuggerd/libdebuggerd/scudo.cpp b/debuggerd/libdebuggerd/scudo.cpp
index 5a62fe1..837f406 100644
--- a/debuggerd/libdebuggerd/scudo.cpp
+++ b/debuggerd/libdebuggerd/scudo.cpp
@@ -22,6 +22,7 @@
 
 #include <android-base/macros.h>
 #include <bionic/macros.h>
+#include <unistd.h>
 
 #include "tombstone.pb.h"
 
@@ -54,21 +55,21 @@
   }
 
   untagged_fault_addr_ = process_info.untagged_fault_address;
-  uintptr_t fault_page = untagged_fault_addr_ & ~(PAGE_SIZE - 1);
+  uintptr_t fault_page = untagged_fault_addr_ & ~(getpagesize() - 1);
 
-  uintptr_t memory_begin = fault_page - PAGE_SIZE * 16;
+  uintptr_t memory_begin = fault_page - getpagesize() * 16;
   if (memory_begin > fault_page) {
     return;
   }
 
-  uintptr_t memory_end = fault_page + PAGE_SIZE * 16;
+  uintptr_t memory_end = fault_page + getpagesize() * 16;
   if (memory_end < fault_page) {
     return;
   }
 
   auto memory = std::make_unique<char[]>(memory_end - memory_begin);
-  for (auto i = memory_begin; i != memory_end; i += PAGE_SIZE) {
-    process_memory->ReadFully(i, memory.get() + i - memory_begin, PAGE_SIZE);
+  for (auto i = memory_begin; i != memory_end; i += getpagesize()) {
+    process_memory->ReadFully(i, memory.get() + i - memory_begin, getpagesize());
   }
 
   auto memory_tags = std::make_unique<char[]>((memory_end - memory_begin) / kTagGranuleSize);
diff --git a/fs_mgr/fs_mgr.cpp b/fs_mgr/fs_mgr.cpp
index 7f4959f..e568a9b 100644
--- a/fs_mgr/fs_mgr.cpp
+++ b/fs_mgr/fs_mgr.cpp
@@ -613,7 +613,6 @@
 
 // Read the primary superblock from an f2fs filesystem.  On failure return
 // false.  If it's not an f2fs filesystem, also set FS_STAT_INVALID_MAGIC.
-#define F2FS_BLKSIZE 4096
 #define F2FS_SUPER_OFFSET 1024
 static bool read_f2fs_superblock(const std::string& blk_device, int* fs_stat) {
     android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(blk_device.c_str(), O_RDONLY | O_CLOEXEC)));
@@ -628,7 +627,9 @@
         PERROR << "Can't read '" << blk_device << "' superblock1";
         return false;
     }
-    if (TEMP_FAILURE_RETRY(pread(fd, &sb2, sizeof(sb2), F2FS_BLKSIZE + F2FS_SUPER_OFFSET)) !=
+    // F2FS only supports block_size=page_size case. So, it is safe to call
+    // `getpagesize()` and use that as size of super block.
+    if (TEMP_FAILURE_RETRY(pread(fd, &sb2, sizeof(sb2), getpagesize() + F2FS_SUPER_OFFSET)) !=
         sizeof(sb2)) {
         PERROR << "Can't read '" << blk_device << "' superblock2";
         return false;
@@ -652,7 +653,7 @@
         return false;
     }
     if (sb == cpu_to_le32(F2FS_SUPER_MAGIC)) return true;
-    if (TEMP_FAILURE_RETRY(pread(fd, &sb, sizeof(sb), F2FS_BLKSIZE + F2FS_SUPER_OFFSET)) !=
+    if (TEMP_FAILURE_RETRY(pread(fd, &sb, sizeof(sb), getpagesize() + F2FS_SUPER_OFFSET)) !=
         sizeof(sb)) {
         return false;
     }
diff --git a/fs_mgr/fs_mgr_format.cpp b/fs_mgr/fs_mgr_format.cpp
index 7385f79..622f181 100644
--- a/fs_mgr/fs_mgr_format.cpp
+++ b/fs_mgr/fs_mgr_format.cpp
@@ -32,6 +32,7 @@
 #include <selinux/android.h>
 #include <selinux/label.h>
 #include <selinux/selinux.h>
+#include <string>
 
 #include "fs_mgr_priv.h"
 
@@ -68,6 +69,13 @@
 
     /* Format the partition using the calculated length */
 
+    // EXT4 supports 4K block size on 16K page sizes. A 4K block
+    // size formatted EXT4 partition will mount fine on both 4K and 16K page
+    // size kernels.
+    // However, EXT4 does not support 16K block size on 4K systems.
+    // If we want the same userspace code to work on both 4k/16k kernels,
+    // using a hardcoded 4096 block size is a simple solution. Using
+    // getpagesize() here would work as well, but 4096 is simpler.
     std::string size_str = std::to_string(dev_sz / 4096);
 
     std::vector<const char*> mke2fs_args = {"/system/bin/mke2fs", "-t", "ext4", "-b", "4096"};
@@ -127,7 +135,7 @@
 
     /* Format the partition using the calculated length */
 
-    std::string size_str = std::to_string(dev_sz / 4096);
+    const auto size_str = std::to_string(dev_sz / getpagesize());
 
     std::vector<const char*> args = {"/system/bin/make_f2fs", "-g", "android"};
     if (needs_projid) {
diff --git a/fs_mgr/fs_mgr_overlayfs.cpp b/fs_mgr/fs_mgr_overlayfs.cpp
index f04fc8d..01827d6 100644
--- a/fs_mgr/fs_mgr_overlayfs.cpp
+++ b/fs_mgr/fs_mgr_overlayfs.cpp
@@ -939,7 +939,9 @@
     auto command = ""s;
     if (!access(kMkF2fs.c_str(), X_OK) && fs_mgr_filesystem_available("f2fs")) {
         fs_type = "f2fs";
-        command = kMkF2fs + " -w 4096 -f -d1 -l" + android::base::Basename(kScratchMountPoint);
+        command = kMkF2fs + " -w ";
+        command += std::to_string(getpagesize());
+        command += " -f -d1 -l" + android::base::Basename(kScratchMountPoint);
     } else if (!access(kMkExt4.c_str(), X_OK) && fs_mgr_filesystem_available("ext4")) {
         fs_type = "ext4";
         command = kMkExt4 + " -F -b 4096 -t ext4 -m 0 -O has_journal -M " + kScratchMountPoint;
diff --git a/init/Android.bp b/init/Android.bp
index 06060db..1af398a 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -228,7 +228,6 @@
     ],
     whole_static_libs: [
         "libcap",
-        "libcom.android.sysprop.apex",
         "libcom.android.sysprop.init",
     ],
     header_libs: ["bootimg_headers"],
diff --git a/init/mount_namespace.cpp b/init/mount_namespace.cpp
index fead371..5b53d50 100644
--- a/init/mount_namespace.cpp
+++ b/init/mount_namespace.cpp
@@ -21,7 +21,6 @@
 #include <string>
 #include <vector>
 
-#include <ApexProperties.sysprop.h>
 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/properties.h>
@@ -30,16 +29,6 @@
 
 #include "util.h"
 
-#ifndef RECOVERY
-#define ACTIVATE_FLATTENED_APEX 1
-#endif
-
-#ifdef ACTIVATE_FLATTENED_APEX
-#include <apex_manifest.pb.h>
-#include <com_android_apex.h>
-#include <selinux/android.h>
-#endif  // ACTIVATE_FLATTENED_APEX
-
 namespace android {
 namespace init {
 namespace {
@@ -77,15 +66,9 @@
     return ret;
 }
 
-static bool IsApexUpdatable() {
-    static bool updatable = android::sysprop::ApexProperties::updatable().value_or(false);
-    return updatable;
-}
-
 // In case we have two sets of APEXes (non-updatable, updatable), we need two separate mount
 // namespaces.
 static bool NeedsTwoMountNamespaces() {
-    if (!IsApexUpdatable()) return false;
     if (IsRecoveryMode()) return false;
     // In microdroid, there's only one set of APEXes in built-in directories include block devices.
     if (IsMicrodroid()) return false;
@@ -193,7 +176,7 @@
 // Switch the mount namespace of the current process from bootstrap to default OR from default to
 // bootstrap. If the current mount namespace is neither bootstrap nor default, keep it that way.
 Result<void> SwitchToMountNamespaceIfNeeded(MountNamespace target_mount_namespace) {
-    if (IsRecoveryMode() || !IsApexUpdatable()) {
+    if (IsRecoveryMode()) {
         // we don't have multiple namespaces in recovery mode or if apex is not updatable
         return {};
     }
diff --git a/init/service.cpp b/init/service.cpp
index 2945708..a0b3478 100644
--- a/init/service.cpp
+++ b/init/service.cpp
@@ -50,7 +50,6 @@
 #endif
 
 #ifdef INIT_FULL_SOURCES
-#include <ApexProperties.sysprop.h>
 #include <android/api-level.h>
 
 #include "mount_namespace.h"
@@ -323,7 +322,7 @@
     }
 
 #if INIT_FULL_SOURCES
-    static bool is_apex_updatable = android::sysprop::ApexProperties::updatable().value_or(false);
+    static bool is_apex_updatable = true;
 #else
     static bool is_apex_updatable = false;
 #endif
diff --git a/libmodprobe/libmodprobe.cpp b/libmodprobe/libmodprobe.cpp
index 858b955..d20b6b1 100644
--- a/libmodprobe/libmodprobe.cpp
+++ b/libmodprobe/libmodprobe.cpp
@@ -230,7 +230,7 @@
     }
 
     std::vector<std::string> lines = android::base::Split(cfg_contents, "\n");
-    for (const std::string line : lines) {
+    for (const auto& line : lines) {
         if (line.empty() || line[0] == '#') {
             continue;
         }
@@ -421,7 +421,8 @@
     }
 
     if (strict && !module_loaded) {
-        LOG(ERROR) << "LoadWithAliases was unable to load " << module_name;
+        LOG(ERROR) << "LoadWithAliases was unable to load " << module_name
+                   << ", tried: " << android::base::Join(modules_to_load, ", ");
         return false;
     }
     return true;
diff --git a/libmodprobe/libmodprobe_ext.cpp b/libmodprobe/libmodprobe_ext.cpp
index 94a1dc4..c4519e3 100644
--- a/libmodprobe/libmodprobe_ext.cpp
+++ b/libmodprobe/libmodprobe_ext.cpp
@@ -84,7 +84,7 @@
 }
 
 bool Modprobe::ModuleExists(const std::string& module_name) {
-    struct stat fileStat;
+    struct stat fileStat {};
     if (blocklist_enabled && module_blocklist_.count(module_name)) {
         LOG(INFO) << "module " << module_name << " is blocklisted";
         return false;
@@ -95,7 +95,7 @@
         return false;
     }
     if (stat(deps.front().c_str(), &fileStat)) {
-        LOG(INFO) << "module " << module_name << " does not exist";
+        PLOG(INFO) << "module " << module_name << " can't be loaded; can't access " << deps.front();
         return false;
     }
     if (!S_ISREG(fileStat.st_mode)) {