Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.6 111/126] sparc32: use PUD rather than PGD to get PMD in srmmu_nocache_init() | Date | Tue, 26 May 2020 20:54:08 +0200 |
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From: Mike Rapoport <rppt@linux.ibm.com>
commit c2bc26f7ca1ff1165bb6669a7a4cccc20ffd2ced upstream.
The kbuild test robot reported the following warning:
arch/sparc/mm/srmmu.c: In function 'srmmu_nocache_init': arch/sparc/mm/srmmu.c:300:9: error: variable 'pud' set but not used [-Werror=unused-but-set-variable] 300 | pud_t *pud;
This warning is caused by misprint in the page table traversal in srmmu_nocache_init() function which accessed a PMD entry using PGD rather than PUD.
Since sparc32 has only 3 page table levels, the PGD and PUD are essentially the same and usage of __nocache_fix() removed the type checking.
Use PUD for the consistency and to silence the compiler warning.
Fixes: 7235db268a2777bc38 ("sparc32: use pgtable-nopud instead of 4level-fixup") Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: David S. Miller <davem@davemloft.net> Cc: Anatoly Pugachev <matorola@gmail.com> Cc: <stable@vger.kernel.org> Link: http://lkml.kernel.org/r/20200520132005.GM1059226@linux.ibm.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/sparc/mm/srmmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/sparc/mm/srmmu.c +++ b/arch/sparc/mm/srmmu.c @@ -333,7 +333,7 @@ static void __init srmmu_nocache_init(vo pgd = pgd_offset_k(vaddr); p4d = p4d_offset(__nocache_fix(pgd), vaddr); pud = pud_offset(__nocache_fix(p4d), vaddr); - pmd = pmd_offset(__nocache_fix(pgd), vaddr); + pmd = pmd_offset(__nocache_fix(pud), vaddr); pte = pte_offset_kernel(__nocache_fix(pmd), vaddr); pteval = ((paddr >> 4) | SRMMU_ET_PTE | SRMMU_PRIV);
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