On 9/19/24 02:00, kernel test robot wrote:
Hi Anshuman,
kernel test robot noticed the following build errors:
[auto build test ERROR on char-misc/char-misc-testing]
[also build test ERROR on char-misc/char-misc-next char-misc/char-misc-linus brauner-vfs/vfs.all dennis-percpu/for-next linus/master v6.11]
[cannot apply to akpm-mm/mm-everything next-20240918]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Anshuman-Khandual/m68k-mm-Change-pmd_val/20240917-153331
base: char-misc/char-misc-testing
patch link: https://lore.kernel.org/r/20240917073117.1531207-8-anshuman.khandual%40arm.com
patch subject: [PATCH V2 7/7] mm: Use pgdp_get() for accessing PGD entries
config: arm-footbridge_defconfig (https://download.01.org/0day-ci/archive/20240919/202409190310.ViHBRe12-lkp@xxxxxxxxx/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 8663a75fa2f31299ab8d1d90288d9df92aadee88)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240919/202409190310.ViHBRe12-lkp@xxxxxxxxx/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409190310.ViHBRe12-lkp@xxxxxxxxx/
All errors (new ones prefixed by >>):
In file included from arch/arm/kernel/asm-offsets.c:12:
In file included from include/linux/mm.h:30:
include/linux/pgtable.h:1245:18: error: use of undeclared identifier 'pgdp'; did you mean 'pgd'?
1245 | pgd_t old_pgd = pgdp_get(pgd);
| ^
arch/arm/include/asm/pgtable.h:154:36: note: expanded from macro 'pgdp_get'
154 | #define pgdp_get(pgpd) READ_ONCE(*pgdp)
| ^
include/linux/pgtable.h:1243:48: note: 'pgd' declared here
1243 | static inline int pgd_none_or_clear_bad(pgd_t *pgd)
| ^
arm (32) platform currently overrides pgdp_get() helper in the platform but
defines that like the exact same version as the generic one, albeit with a
typo which can be fixed with something like this.
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index be91e376df79..aedb32d49c2a 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -151,7 +151,7 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
-#define pgdp_get(pgpd) READ_ONCE(*pgdp)
+#define pgdp_get(pgdp) READ_ONCE(*pgdp)
#define pud_page(pud) pmd_page(__pmd(pud_val(pud)))
#define pud_write(pud) pmd_write(__pmd(pud_val(pud)))
Regardless there is another problem here. On arm platform there are multiple
pgd_t definitions available depending on various configs but some are arrays
instead of a single data element, although platform pgdp_get() helper remains
the same for all.
arch/arm/include/asm/page-nommu.h:typedef unsigned long pgd_t[2];
arch/arm/include/asm/pgtable-2level-types.h:typedef struct { pmdval_t pgd[2]; } pgd_t;
arch/arm/include/asm/pgtable-2level-types.h:typedef pmdval_t pgd_t[2];
arch/arm/include/asm/pgtable-3level-types.h:typedef struct { pgdval_t pgd; } pgd_t;
arch/arm/include/asm/pgtable-3level-types.h:typedef pgdval_t pgd_t;
I guess it might need different pgdp_get() variants depending applicable pgd_t
definition. Will continue looking into this further but meanwhile copied Russel
King in case he might be able to give some direction.
