On Wed, May 20, 2020 at 08:57:33AM +0800, kbuild test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > head: 642b151f45dd54809ea00ecd3976a56c1ec9b53d > commit: 7235db268a2777bc380b99b7db49ff7b19c8fb76 sparc32: use pgtable-nopud instead of 4level-fixup > config: sparc-defconfig (attached as .config) > compiler: sparc-linux-gcc (GCC) 9.3.0 > reproduce: > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > git checkout 7235db268a2777bc380b99b7db49ff7b19c8fb76 > # save the attached .config to linux build tree > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kbuild test robot <lkp@xxxxxxxxx> > > All errors (new ones prefixed by >>, old ones prefixed by <<): > > 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; > | ^~~ Here's the fix vs v5.7-rc6-mmots-2020-05-19-21-52: >From 192848144e61e3ebacd34598386e4fa773d19ae9 Mon Sep 17 00:00:00 2001 From: Mike Rapoport <rppt@xxxxxxxxxxxxx> Date: Wed, 20 May 2020 15:39:22 +0300 Subject: [PATCH] sparc32: use PUD rather than PGD to get PMD in srmmu_nocache_init() 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. Reported-by: kbuild test robot <lkp@xxxxxxxxx> Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx> --- arch/sparc/mm/srmmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c index 6cb1ea2d2b5c..75b56bdd38ef 100644 --- a/arch/sparc/mm/srmmu.c +++ b/arch/sparc/mm/srmmu.c @@ -304,7 +304,7 @@ static void __init srmmu_nocache_init(void) 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); -- 2.26.2
