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selftests/mm: fix a build failure on powerpc

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commit 8cf6ecb18baac867585fe1cba5dde6dbf3b6d29a upstream.

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: 46036188ea1f ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nysal Jan K.A.
2025-04-28 18:49:35 +05:30
committed by Greg Kroah-Hartman
parent b21ec0726a
commit 5156f7c484
1 changed files with 11 additions and 1 deletions
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12
tools/testing/selftests/mm/pkey-powerpc.h
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@@ -102,8 +102,18 @@ 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"))
void *malloc_pkey_with_mprotect_subpage(long size, int prot, u16 pkey)
{