[PATCH 1/2] selftests/mm: Fix build break when compiling pkey_util.c

[PATCH 1/2] selftests/mm: Fix build break when compiling pkey_util.c

[Nysal Jan K.A.]

From: Madhavan Srinivasan <maddy@linux.ibm.com>

Commit 50910acd6f615 ("selftests/mm: use sys_pkey helpers consistently")
added a pkey_util.c to refactor some of the protection_keys functions accessible
by other tests. But this broken the build in powerpc in two ways,

pkey-powerpc.h: In function ‘arch_is_powervm’:
pkey-powerpc.h:73:21: error: storage size of ‘buf’ isn’t known
   73 |         struct stat buf;
      |                     ^~~
pkey-powerpc.h:75:14: error: implicit declaration of function ‘stat’; did you mean ‘strcat’? [-Wimplicit-function-declaration]
   75 |         if ((stat("/sys/firmware/devicetree/base/ibm,partition-name", &buf) == 0) &&
      |              ^~~~
      |              strcat

Since pkey_util.c includes pkeys-helper.h, which in turn includes pkeys-powerpc.h,
stat.h including is missing for "struct stat". This is fixed by adding "sys/stat.h"
in pkeys-powerpc.h

Secondly,

pkey-powerpc.h:55:18: warning: format ‘%llx’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘u64’ {aka ‘long unsigned int’} [-Wformat=]
   55 |         dprintf4("%s() changing %016llx to %016llx\n",
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   56 |                          __func__, __read_pkey_reg(), pkey_reg);
      |                                    ~~~~~~~~~~~~~~~~~
      |                                    |
      |                                    u64 {aka long unsigned int}
pkey-helpers.h:63:32: note: in definition of macro ‘dprintf_level’
   63 |                 sigsafe_printf(args);           \
      |                                ^~~~

These format specifier related warning are removed by adding
"__SANE_USERSPACE_TYPES__" to pkeys_utils.c.

Fixes: 50910acd6f615 ("selftests/mm: use sys_pkey helpers consistently")
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Nysal Jan K.A. <nysal@linux.ibm.com>
---
 tools/testing/selftests/mm/pkey-powerpc.h | 2 ++
 tools/testing/selftests/mm/pkey_util.c    | 1 +
 2 files changed, 3 insertions(+)

diff --git a/tools/testing/selftests/mm/pkey-powerpc.h b/tools/testing/selftests/mm/pkey-powerpc.h
index 1bad310d282a..d8ec906b8120 100644
--- a/tools/testing/selftests/mm/pkey-powerpc.h
+++ b/tools/testing/selftests/mm/pkey-powerpc.h
@@ -3,6 +3,8 @@
 #ifndef _PKEYS_POWERPC_H
 #define _PKEYS_POWERPC_H
 
+#include <sys/stat.h>
+
 #ifndef SYS_pkey_alloc
 # define SYS_pkey_alloc		384
 # define SYS_pkey_free		385
diff --git a/tools/testing/selftests/mm/pkey_util.c b/tools/testing/selftests/mm/pkey_util.c
index ca4ad0d44ab2..255b332f7a08 100644
--- a/tools/testing/selftests/mm/pkey_util.c
+++ b/tools/testing/selftests/mm/pkey_util.c
@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
+#define __SANE_USERSPACE_TYPES__
 #include <sys/syscall.h>
 #include <unistd.h>
 
-- 
2.47.0

[PATCH 2/2] selftests/mm: Fix a build failure on powerpc

[Nysal Jan K.A.]

The compiler is unaware of the size of code generated by the ".rept"
assembler directive. This results in the compiler emitting branch
instructions where the offset to branch to exceeds the maximum allowed
value, resulting in build failures like the following:

  CC       protection_keys
  /tmp/ccypKWAE.s: Assembler messages:
  /tmp/ccypKWAE.s:2073: Error: operand out of range (0x0000000000020158
  is not between 0xffffffffffff8000 and 0x0000000000007ffc)
  /tmp/ccypKWAE.s:2509: Error: operand out of range (0x0000000000020130
  is not between 0xffffffffffff8000 and 0x0000000000007ffc)

Fix the issue by manually adding nop instructions using the preprocessor.

Fixes: 46036188ea1f5 ("selftests/mm: build with -O2")
Reported-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Nysal Jan K.A. <nysal@linux.ibm.com>
---
 tools/testing/selftests/mm/pkey-powerpc.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/pkey-powerpc.h b/tools/testing/selftests/mm/pkey-powerpc.h
index d8ec906b8120..17bf2d1b0192 100644
--- a/tools/testing/selftests/mm/pkey-powerpc.h
+++ b/tools/testing/selftests/mm/pkey-powerpc.h
@@ -104,8 +104,18 @@ static inline void expect_fault_on_read_execonly_key(void *p1, int pkey)
 	return;
 }
 
+#define REPEAT_8(s) s s s s s s s s
+#define REPEAT_64(s) REPEAT_8(s) REPEAT_8(s) REPEAT_8(s) REPEAT_8(s) \
+		     REPEAT_8(s) REPEAT_8(s) REPEAT_8(s) REPEAT_8(s)
+#define REPEAT_512(s) REPEAT_64(s) REPEAT_64(s) REPEAT_64(s) REPEAT_64(s) \
+		      REPEAT_64(s) REPEAT_64(s) REPEAT_64(s) REPEAT_64(s)
+#define REPEAT_4096(s) REPEAT_512(s) REPEAT_512(s) REPEAT_512(s) REPEAT_512(s) \
+		       REPEAT_512(s) REPEAT_512(s) REPEAT_512(s) REPEAT_512(s)
+#define REPEAT_16384(s) REPEAT_4096(s) REPEAT_4096(s) \
+			REPEAT_4096(s) REPEAT_4096(s)
+
 /* 4-byte instructions * 16384 = 64K page */
-#define __page_o_noops() asm(".rept 16384 ; nop; .endr")
+#define __page_o_noops() asm(REPEAT_16384("nop\n"))
 
 static inline void *malloc_pkey_with_mprotect_subpage(long size, int prot, u16 pkey)
 {
-- 
2.47.0

Re: [PATCH 2/2] selftests/mm: Fix a build failure on powerpc

[Venkat Rao Bagalkote]

On 28/04/25 6:49 pm, Nysal Jan K.A. wrote:
> The compiler is unaware of the size of code generated by the ".rept"
> assembler directive. This results in the compiler emitting branch
> instructions where the offset to branch to exceeds the maximum allowed
> value, resulting in build failures like the following:
>
>    CC       protection_keys
>    /tmp/ccypKWAE.s: Assembler messages:
>    /tmp/ccypKWAE.s:2073: Error: operand out of range (0x0000000000020158
>    is not between 0xffffffffffff8000 and 0x0000000000007ffc)
>    /tmp/ccypKWAE.s:2509: Error: operand out of range (0x0000000000020130
>    is not between 0xffffffffffff8000 and 0x0000000000007ffc)
>
> Fix the issue by manually adding nop instructions using the preprocessor.
>
> Fixes: 46036188ea1f5 ("selftests/mm: build with -O2")
> Reported-by: Madhavan Srinivasan <maddy@linux.ibm.com>
> Signed-off-by: Nysal Jan K.A. <nysal@linux.ibm.com>
> ---
>   tools/testing/selftests/mm/pkey-powerpc.h | 12 +++++++++++-
>   1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/mm/pkey-powerpc.h b/tools/testing/selftests/mm/pkey-powerpc.h
> index d8ec906b8120..17bf2d1b0192 100644
> --- a/tools/testing/selftests/mm/pkey-powerpc.h
> +++ b/tools/testing/selftests/mm/pkey-powerpc.h
> @@ -104,8 +104,18 @@ static inline void expect_fault_on_read_execonly_key(void *p1, int pkey)
>   	return;
>   }
>   
> +#define REPEAT_8(s) s s s s s s s s
> +#define REPEAT_64(s) REPEAT_8(s) REPEAT_8(s) REPEAT_8(s) REPEAT_8(s) \
> +		     REPEAT_8(s) REPEAT_8(s) REPEAT_8(s) REPEAT_8(s)
> +#define REPEAT_512(s) REPEAT_64(s) REPEAT_64(s) REPEAT_64(s) REPEAT_64(s) \
> +		      REPEAT_64(s) REPEAT_64(s) REPEAT_64(s) REPEAT_64(s)
> +#define REPEAT_4096(s) REPEAT_512(s) REPEAT_512(s) REPEAT_512(s) REPEAT_512(s) \
> +		       REPEAT_512(s) REPEAT_512(s) REPEAT_512(s) REPEAT_512(s)
> +#define REPEAT_16384(s) REPEAT_4096(s) REPEAT_4096(s) \
> +			REPEAT_4096(s) REPEAT_4096(s)
> +
>   /* 4-byte instructions * 16384 = 64K page */
> -#define __page_o_noops() asm(".rept 16384 ; nop; .endr")
> +#define __page_o_noops() asm(REPEAT_16384("nop\n"))
>   
>   static inline void *malloc_pkey_with_mprotect_subpage(long size, int prot, u16 pkey)
>   {


Tested this patch by applying on top of mainline kernel v6.15-rc4, and 
it fixes the build issue. Hence,


Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>


Without this Patch:


  CC       protection_keys
/tmp/ccG0zLKW.s: Assembler messages:
/tmp/ccG0zLKW.s:1694: Error: operand out of range (0x0000000000020138 is 
not between 0xffffffffffff8000 and 0x0000000000007ffc)
/tmp/ccG0zLKW.s:2577: Error: operand out of range (0x0000000000020110 is 
not between 0xffffffffffff8000 and 0x0000000000007ffc)
In file included from pkey_util.c:5:


With this patch:


make -j 33
/bin/sh ./check_config.sh gcc
   CC       cow
   CC       compaction_test
   CC       gup_longterm
   CC       gup_test
   CC       hmm-tests
   CC       hugetlb-madvise
   CC       hugetlb-read-hwpoison
   CC       hugetlb-soft-offline
   CC       hugepage-mmap
   CC       hugepage-mremap
   CC       hugepage-shm
   CC       hugepage-vmemmap
   CC       khugepaged
   CC       madv_populate
   CC       map_fixed_noreplace
   CC       map_hugetlb
   CC       map_populate
   CC       migration
   CC       mkdirty
   CC       mlock-random-test
   CC       mlock2-tests
   CC       mrelease_test
   CC       mremap_dontunmap
   CC       mremap_test
   CC       mseal_test
   CC       on-fault-limit
   CC       pagemap_ioctl
   CC       thuge-gen
   CC       transhuge-stress
   CC       uffd-stress
   CC       uffd-unit-tests
   CC       uffd-wp-mremap
   CC       split_huge_page_test
   CC       ksm_tests
   CC       ksm_functional_tests
   CC       hugetlb_fault_after_madv
   CC       hugetlb_madv_vs_map
   CC       mdwe_test
   CC       hugetlb_dio
   CC       droppable
   CC       guard-regions
   CC       soft-dirty
   CC       protection_keys
   CC       va_high_addr_switch
   CC       virtual_address_range
   CC       write_to_hugetlbfs
   CC [M]  page_frag_test.o
   MODPOST Module.symvers
   CC [M]  page_frag_test.mod.o
   CC [M]  .module-common.o
   LD [M]  page_frag_test.ko


Regards,

Venkat.

Re: [PATCH 2/2] selftests/mm: Fix a build failure on powerpc

[Donet Tom]

On 4/28/25 6:49 PM, Nysal Jan K.A. wrote:
> The compiler is unaware of the size of code generated by the ".rept"
> assembler directive. This results in the compiler emitting branch
> instructions where the offset to branch to exceeds the maximum allowed
> value, resulting in build failures like the following:
>
>    CC       protection_keys
>    /tmp/ccypKWAE.s: Assembler messages:
>    /tmp/ccypKWAE.s:2073: Error: operand out of range (0x0000000000020158
>    is not between 0xffffffffffff8000 and 0x0000000000007ffc)
>    /tmp/ccypKWAE.s:2509: Error: operand out of range (0x0000000000020130
>    is not between 0xffffffffffff8000 and 0x0000000000007ffc)
>
> Fix the issue by manually adding nop instructions using the preprocessor.
>
> Fixes: 46036188ea1f5 ("selftests/mm: build with -O2")
> Reported-by: Madhavan Srinivasan <maddy@linux.ibm.com>
> Signed-off-by: Nysal Jan K.A. <nysal@linux.ibm.com>
> ---
>   tools/testing/selftests/mm/pkey-powerpc.h | 12 +++++++++++-
>   1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/mm/pkey-powerpc.h b/tools/testing/selftests/mm/pkey-powerpc.h
> index d8ec906b8120..17bf2d1b0192 100644
> --- a/tools/testing/selftests/mm/pkey-powerpc.h
> +++ b/tools/testing/selftests/mm/pkey-powerpc.h
> @@ -104,8 +104,18 @@ static inline void expect_fault_on_read_execonly_key(void *p1, int pkey)
>   	return;
>   }
>   
> +#define REPEAT_8(s) s s s s s s s s
> +#define REPEAT_64(s) REPEAT_8(s) REPEAT_8(s) REPEAT_8(s) REPEAT_8(s) \
> +		     REPEAT_8(s) REPEAT_8(s) REPEAT_8(s) REPEAT_8(s)
> +#define REPEAT_512(s) REPEAT_64(s) REPEAT_64(s) REPEAT_64(s) REPEAT_64(s) \
> +		      REPEAT_64(s) REPEAT_64(s) REPEAT_64(s) REPEAT_64(s)
> +#define REPEAT_4096(s) REPEAT_512(s) REPEAT_512(s) REPEAT_512(s) REPEAT_512(s) \
> +		       REPEAT_512(s) REPEAT_512(s) REPEAT_512(s) REPEAT_512(s)
> +#define REPEAT_16384(s) REPEAT_4096(s) REPEAT_4096(s) \
> +			REPEAT_4096(s) REPEAT_4096(s)
> +


Hi Nysal,

This change looks good to me. I tested in on power and the error is not seen.

   CC       droppable
   CC       guard-regions
   CC       soft-dirty
   CC       protection_keys
   CC       va_high_addr_switch
   CC       virtual_address_range
   CC       write_to_hugetlbfs

Reviewed-by:Donet Tom <donettom@linux.ibm.com>
Tested-by: Donet Tom <donettom@linux.ibm.com>


>   /* 4-byte instructions * 16384 = 64K page */
> -#define __page_o_noops() asm(".rept 16384 ; nop; .endr")
> +#define __page_o_noops() asm(REPEAT_16384("nop\n"))
>   
>   static inline void *malloc_pkey_with_mprotect_subpage(long size, int prot, u16 pkey)
>   {

Re: [PATCH 1/2] selftests/mm: Fix build break when compiling pkey_util.c

[Venkat Rao Bagalkote]

On 28/04/25 6:49 pm, Nysal Jan K.A. wrote:
> From: Madhavan Srinivasan <maddy@linux.ibm.com>
>
> Commit 50910acd6f615 ("selftests/mm: use sys_pkey helpers consistently")
> added a pkey_util.c to refactor some of the protection_keys functions accessible
> by other tests. But this broken the build in powerpc in two ways,
>
> pkey-powerpc.h: In function ‘arch_is_powervm’:
> pkey-powerpc.h:73:21: error: storage size of ‘buf’ isn’t known
>     73 |         struct stat buf;
>        |                     ^~~
> pkey-powerpc.h:75:14: error: implicit declaration of function ‘stat’; did you mean ‘strcat’? [-Wimplicit-function-declaration]
>     75 |         if ((stat("/sys/firmware/devicetree/base/ibm,partition-name", &buf) == 0) &&
>        |              ^~~~
>        |              strcat
>
> Since pkey_util.c includes pkeys-helper.h, which in turn includes pkeys-powerpc.h,
> stat.h including is missing for "struct stat". This is fixed by adding "sys/stat.h"
> in pkeys-powerpc.h
>
> Secondly,
>
> pkey-powerpc.h:55:18: warning: format ‘%llx’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘u64’ {aka ‘long unsigned int’} [-Wformat=]
>     55 |         dprintf4("%s() changing %016llx to %016llx\n",
>        |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>     56 |                          __func__, __read_pkey_reg(), pkey_reg);
>        |                                    ~~~~~~~~~~~~~~~~~
>        |                                    |
>        |                                    u64 {aka long unsigned int}
> pkey-helpers.h:63:32: note: in definition of macro ‘dprintf_level’
>     63 |                 sigsafe_printf(args);           \
>        |                                ^~~~
>
> These format specifier related warning are removed by adding
> "__SANE_USERSPACE_TYPES__" to pkeys_utils.c.
>
> Fixes: 50910acd6f615 ("selftests/mm: use sys_pkey helpers consistently")
> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
> Signed-off-by: Nysal Jan K.A. <nysal@linux.ibm.com>
> ---
>   tools/testing/selftests/mm/pkey-powerpc.h | 2 ++
>   tools/testing/selftests/mm/pkey_util.c    | 1 +
>   2 files changed, 3 insertions(+)
>
> diff --git a/tools/testing/selftests/mm/pkey-powerpc.h b/tools/testing/selftests/mm/pkey-powerpc.h
> index 1bad310d282a..d8ec906b8120 100644
> --- a/tools/testing/selftests/mm/pkey-powerpc.h
> +++ b/tools/testing/selftests/mm/pkey-powerpc.h
> @@ -3,6 +3,8 @@
>   #ifndef _PKEYS_POWERPC_H
>   #define _PKEYS_POWERPC_H
>   
> +#include <sys/stat.h>
> +
>   #ifndef SYS_pkey_alloc
>   # define SYS_pkey_alloc		384
>   # define SYS_pkey_free		385
> diff --git a/tools/testing/selftests/mm/pkey_util.c b/tools/testing/selftests/mm/pkey_util.c
> index ca4ad0d44ab2..255b332f7a08 100644
> --- a/tools/testing/selftests/mm/pkey_util.c
> +++ b/tools/testing/selftests/mm/pkey_util.c
> @@ -1,4 +1,5 @@
>   // SPDX-License-Identifier: GPL-2.0-only
> +#define __SANE_USERSPACE_TYPES__
>   #include <sys/syscall.h>
>   #include <unistd.h>
>   

Tested this patch by applying on top of mainline kernel v6.15-rc4, and 
it fixes the build issue. Hence,


Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>


Without this Patch:


pkey-powerpc.h: In function ‘arch_is_powervm’:
pkey-powerpc.h:73:21: error: storage size of ‘buf’ isn’t known
    73 |         struct stat buf;
       |                     ^~~
pkey-powerpc.h:75:14: warning: implicit declaration of function ‘stat’; 
did you mean ‘strcat’? [-Wimplicit-function-declaration]
    75 |         if 
((stat("/sys/firmware/devicetree/base/ibm,partition-name", &buf) == 0) &&
       |              ^~~~
       |              strcat


With this patch:


make -j 33
/bin/sh ./check_config.sh gcc
   CC       cow
   CC       compaction_test
   CC       gup_longterm
   CC       gup_test
   CC       hmm-tests
   CC       hugetlb-madvise
   CC       hugetlb-read-hwpoison
   CC       hugetlb-soft-offline
   CC       hugepage-mmap
   CC       hugepage-mremap
   CC       hugepage-shm
   CC       hugepage-vmemmap
   CC       khugepaged
   CC       madv_populate
   CC       map_fixed_noreplace
   CC       map_hugetlb
   CC       map_populate
   CC       migration
   CC       mkdirty
   CC       mlock-random-test
   CC       mlock2-tests
   CC       mrelease_test
   CC       mremap_dontunmap
   CC       mremap_test
   CC       mseal_test
   CC       on-fault-limit
   CC       pagemap_ioctl
   CC       thuge-gen
   CC       transhuge-stress
   CC       uffd-stress
   CC       uffd-unit-tests
   CC       uffd-wp-mremap
   CC       split_huge_page_test
   CC       ksm_tests
   CC       ksm_functional_tests
   CC       hugetlb_fault_after_madv
   CC       hugetlb_madv_vs_map
   CC       mdwe_test
   CC       hugetlb_dio
   CC       droppable
   CC       guard-regions
   CC       soft-dirty
   CC       protection_keys
   CC       va_high_addr_switch
   CC       virtual_address_range
   CC       write_to_hugetlbfs
   CC [M]  page_frag_test.o
   MODPOST Module.symvers
   CC [M]  page_frag_test.mod.o
   CC [M]  .module-common.o
   LD [M]  page_frag_test.ko


Regards,

Venkat.