# In some platforms, |statfs_buf.f_type| is declared as signed, but some of the
# values will overflow it, causing narrowing warnings. Cast to the largest
# possible unsigned integer type to avoid it.

--- a/base/files/file_util_linux.cc
+++ b/base/files/file_util_linux.cc
@@ -6,6 +6,7 @@
 
 #include <errno.h>
 #include <linux/magic.h>
+#include <stdint.h>
 #include <sys/vfs.h>
 
 #include "base/files/file_path.h"
@@ -23,7 +24,10 @@ bool GetFileSystemType(const FilePath& p
 
   // Not all possible |statfs_buf.f_type| values are in linux/magic.h.
   // Missing values are copied from the statfs man page.
-  switch (statfs_buf.f_type) {
+  // In some platforms, |statfs_buf.f_type| is declared as signed, but some of
+  // the values will overflow it, causing narrowing warnings. Cast to the
+  // largest possible unsigned integer type to avoid it.
+  switch (static_cast<uintmax_t>(statfs_buf.f_type)) {
     case 0:
       *type = FILE_SYSTEM_0;
       break;
--- a/base/sys_info_posix.cc
+++ b/base/sys_info_posix.cc
@@ -90,7 +90,10 @@ bool IsStatsZeroIfUnlimited(const base::FilePath& path) {
   if (HANDLE_EINTR(statfs(path.value().c_str(), &stats)) != 0)
     return false;
 
-  switch (stats.f_type) {
+  // In some platforms, |statfs_buf.f_type| is declared as signed, but some of
+  // the values will overflow it, causing narrowing warnings. Cast to the
+  // largest possible unsigned integer type to avoid it.
+  switch (static_cast<uintmax_t>(stats.f_type)) {
     case TMPFS_MAGIC:
     case HUGETLBFS_MAGIC:
     case RAMFS_MAGIC: