Commit e6d2c436ff693 ("tools/mm: allow users to provide
additional cflags/ldflags") passes now CFLAGS to Makefile.
With this, build systems with default -Werror enabled found:

slabinfo.c:1300:25: error: ignoring return value of 'chdir'
declared with attribute 'warn_unused_result' [-Werror=unused-result]
                         chdir("..");
                         ^~~~~~~~~~~
page-types.c:397:35: error: format '%lu' expects argument of type
'long unsigned int', but argument 2 has type 'uint64_t'
{aka 'long long unsigned int'} [-Werror=format=]
                         printf("%lu\t", mapcnt0);
                                 ~~^     ~~~~~~~
..

Fix page-types by using PRIu64 for uint64_t prints and check
in slabinfo for return code on chdir("..").

Signed-off-by: Wladislav Wiebe <wladislav.kw@gmail.com>
---
 tools/mm/page-types.c | 9 +++++----
 tools/mm/slabinfo.c   | 3 ++-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/tools/mm/page-types.c b/tools/mm/page-types.c
index 8d5595b6c59f8..69f00eab1b8c7 100644
--- a/tools/mm/page-types.c
+++ b/tools/mm/page-types.c
@@ -22,6 +22,7 @@
 #include <time.h>
 #include <setjmp.h>
 #include <signal.h>
+#include <inttypes.h>
 #include <sys/types.h>
 #include <sys/errno.h>
 #include <sys/fcntl.h>
@@ -392,9 +393,9 @@ static void show_page_range(unsigned long voffset, unsigned long offset,
         if (opt_file)
             printf("%lx\t", voff);
         if (opt_list_cgroup)
-            printf("@%llu\t", (unsigned long long)cgroup0);
+            printf("@%" PRIu64 "\t", cgroup0);
         if (opt_list_mapcnt)
-            printf("%lu\t", mapcnt0);
+            printf("%" PRIu64 "\t", mapcnt0);
         printf("%lx\t%lx\t%s\n",
                 index, count, page_flag_name(flags0));
     }
@@ -420,9 +421,9 @@ static void show_page(unsigned long voffset, unsigned long offset,
     if (opt_file)
         printf("%lx\t", voffset);
     if (opt_list_cgroup)
-        printf("@%llu\t", (unsigned long long)cgroup);
+        printf("@%" PRIu64 "\t", cgroup);
     if (opt_list_mapcnt)
-        printf("%lu\t", mapcnt);
+        printf("%" PRIu64 "\t", mapcnt);
 
     printf("%lx\t%s\n", offset, page_flag_name(flags));
 }
diff --git a/tools/mm/slabinfo.c b/tools/mm/slabinfo.c
index cfaeaea71042e..643fd9558e09a 100644
--- a/tools/mm/slabinfo.c
+++ b/tools/mm/slabinfo.c
@@ -1297,7 +1297,8 @@ static void read_slab_dir(void)
             slab->cpu_partial_free = get_obj("cpu_partial_free");
             slab->alloc_node_mismatch = get_obj("alloc_node_mismatch");
             slab->deactivate_bypass = get_obj("deactivate_bypass");
-            chdir("..");
+            if (chdir(".."))
+                fatal("Unable to chdir from slab ../%s\n", slab->name);
             if (slab->name[0] == ':')
                 alias_targets++;
             slab++;
-- 
2.39.3.dirty

On Tue, 22 Oct 2024 19:21:13 +0200 Wladislav Wiebe <wladislav.kw@gmail.com> wrote:

> Commit e6d2c436ff693 ("tools/mm: allow users to provide
> additional cflags/ldflags") passes now CFLAGS to Makefile.
> With this, build systems with default -Werror enabled found:
> 
> slabinfo.c:1300:25: error: ignoring return value of 'chdir'
> declared with attribute 'warn_unused_result' [-Werror=unused-result]
>                          chdir("..");
>                          ^~~~~~~~~~~
> page-types.c:397:35: error: format '%lu' expects argument of type
> 'long unsigned int', but argument 2 has type 'uint64_t'
> {aka 'long long unsigned int'} [-Werror=format=]
>                          printf("%lu\t", mapcnt0);
>                                  ~~^     ~~~~~~~
> ..
> 
> Fix page-types by using PRIu64 for uint64_t prints and check
> in slabinfo for return code on chdir("..").
> 

Thanks.

Your email client messed this up in strange ways, so I basically typed
it in again.  I added the Fixes: target and a cc:stable.

On 24/10/2024 01:51, Andrew Morton wrote:
> On Tue, 22 Oct 2024 19:21:13 +0200 Wladislav Wiebe <wladislav.kw@gmail.com> wrote:
>
>> Commit e6d2c436ff693 ("tools/mm: allow users to provide
>> additional cflags/ldflags") passes now CFLAGS to Makefile.
>> With this, build systems with default -Werror enabled found:
>>
>> slabinfo.c:1300:25: error: ignoring return value of 'chdir'
>> declared with attribute 'warn_unused_result' [-Werror=unused-result]
>>                          chdir("..");
>>                          ^~~~~~~~~~~
>> page-types.c:397:35: error: format '%lu' expects argument of type
>> 'long unsigned int', but argument 2 has type 'uint64_t'
>> {aka 'long long unsigned int'} [-Werror=format=]
>>                          printf("%lu\t", mapcnt0);
>>                                  ~~^     ~~~~~~~
>> ..
>>
>> Fix page-types by using PRIu64 for uint64_t prints and check
>> in slabinfo for return code on chdir("..").
>>
> Thanks.
>
> Your email client messed this up in strange ways, so I basically typed
> it in again.  I added the Fixes: target and a cc:stable.

thanks for the feedback, seems something went wrong after updating my mail client, I will fix it.