The patch titled Subject: selftests/mm: fix a build failure on powerpc has been added to the -mm mm-hotfixes-unstable branch. Its filename is selftests-mm-fix-a-build-failure-on-powerpc.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: "Nysal Jan K.A." nysal@linux.ibm.com Subject: selftests/mm: fix a build failure on powerpc Date: Mon, 28 Apr 2025 18:49:35 +0530

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.

Link: https://lkml.kernel.org/r/20250428131937.641989-2-nysal@linux.ibm.com 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 Tested-by: Venkat Rao Bagalkote venkat88@linux.ibm.com Reviewed-by:Donet Tom donettom@linux.ibm.com Tested-by: Donet Tom donettom@linux.ibm.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

tools/testing/selftests/mm/pkey-powerpc.h | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/mm/pkey-powerpc.h~selftests-mm-fix-a-build-failure-on-powerpc +++ a/tools/testing/selftests/mm/pkey-powerpc.h @@ -104,8 +104,18 @@ static inline void expect_fault_on_read_ 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) { _

Patches currently in -mm which might be from nysal@linux.ibm.com are

selftests-mm-fix-a-build-failure-on-powerpc.patch