* [davidhildenbrand:folded_pgtable 29/32] arch/x86/mm/pgtable.c:250:23: warning: variable 'pudp_s' set but not used
@ 2026-07-09 2:21 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-07-09 2:21 UTC (permalink / raw)
To: David Hildenbrand (Arm); +Cc: oe-kbuild-all
tree: https://github.com/davidhildenbrand/linux folded_pgtable
head: 0551ca68b7552b7d71f1d2882635809a573d6c79
commit: 0963570e536ad72776105fbd404b09e35b19927a [29/32] mm/pgtable: disallow calling folded (pgd|p4d|pud)_page, pgd_page_vaddr() and (p4d|pud)_pgtable
config: i386-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260709/202607090449.nuF7ILjx-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260709/202607090449.nuF7ILjx-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202607090449.nuF7ILjx-lkp@intel.com/
All warnings (new ones prefixed by >>):
arch/x86/mm/pgtable.c: In function 'pgd_prepopulate_pmd':
>> arch/x86/mm/pgtable.c:250:23: warning: variable 'pudp_s' set but not used [-Wunused-but-set-variable]
250 | pud_t *pudp, *pudp_s;
| ^~~~~~
In file included from <command-line>:
arch/x86/mm/pgtable.c: In function 'pudp_set_access_flags':
././include/linux/compiler_types.h:702:45: error: call to '__compiletime_assert_484' declared with attribute error: BUILD_BUG failed
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^
././include/linux/compiler_types.h:683:25: note: in definition of macro '__compiletime_assert'
683 | prefix ## suffix(); \
| ^~~~~~
././include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
./include/linux/build_bug.h:40:37: note: in expansion of macro 'compiletime_assert'
40 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
| ^~~~~~~~~~~~~~~~~~
./include/linux/build_bug.h:60:21: note: in expansion of macro 'BUILD_BUG_ON_MSG'
60 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
| ^~~~~~~~~~~~~~~~
./include/asm-generic/pgtable-nopmd.h:41:49: note: in expansion of macro 'BUILD_BUG'
41 | #define set_pud(pudptr, pudval) BUILD_BUG()
| ^~~~~~~~~
arch/x86/mm/pgtable.c:434:17: note: in expansion of macro 'set_pud'
434 | set_pud(pudp, entry);
| ^~~~~~~
vim +/pudp_s +250 arch/x86/mm/pgtable.c
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 246
0a3c7e279b112f Yeoreum Yun 2026-07-08 247 static void pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgdp, pmd_t *pmds[])
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 248 {
0a3c7e279b112f Yeoreum Yun 2026-07-08 249 p4d_t *p4dp, *p4dp_s;
0a3c7e279b112f Yeoreum Yun 2026-07-08 @250 pud_t *pudp, *pudp_s;
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 251 int i;
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 252
0a3c7e279b112f Yeoreum Yun 2026-07-08 253 p4dp = p4d_offset(pgdp, 0);
0a3c7e279b112f Yeoreum Yun 2026-07-08 254 pudp = pud_offset(p4dp, 0);
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 255
0a3c7e279b112f Yeoreum Yun 2026-07-08 256 for (i = 0; i < PREALLOCATED_PMDS; i++, pudp++) {
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 257 pmd_t *pmd = pmds[i];
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 258
0a3c7e279b112f Yeoreum Yun 2026-07-08 259 if (i >= KERNEL_PGD_BOUNDARY) {
0a3c7e279b112f Yeoreum Yun 2026-07-08 260 p4dp_s = p4d_offset(&swapper_pg_dir[i], 0);
0a3c7e279b112f Yeoreum Yun 2026-07-08 261 pudp_s = pud_offset(p4dp_s, 0);
0a3c7e279b112f Yeoreum Yun 2026-07-08 262
0a3c7e279b112f Yeoreum Yun 2026-07-08 263 memcpy(pmd, (pmd_t *)pud_pgtable(pudp_get(pudp_s)),
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 264 sizeof(pmd_t) * PTRS_PER_PMD);
0a3c7e279b112f Yeoreum Yun 2026-07-08 265 }
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 266
0a3c7e279b112f Yeoreum Yun 2026-07-08 267 pud_populate(mm, pudp, pmd);
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 268 }
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 269 }
1ec1fe73dfb711 Ingo Molnar 2008-03-19 270
:::::: The code at line 250 was first introduced by commit
:::::: 0a3c7e279b112f82e4a7a2a24e499fe971b871a3 x86: mm: remove usage of pgd_page_vaddr() for CONFIG_x86_PAE
:::::: TO: Yeoreum Yun <yeoreum.yun@arm.com>
:::::: CC: David Hildenbrand (Arm) <david@kernel.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread* [davidhildenbrand:folded_pgtable 29/32] arch/x86/mm/pgtable.c:250:23: warning: variable 'pudp_s' set but not used
@ 2026-07-09 12:37 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-07-09 12:37 UTC (permalink / raw)
To: David Hildenbrand (Arm); +Cc: oe-kbuild-all
tree: https://github.com/davidhildenbrand/linux folded_pgtable
head: 0551ca68b7552b7d71f1d2882635809a573d6c79
commit: 0963570e536ad72776105fbd404b09e35b19927a [29/32] mm/pgtable: disallow calling folded (pgd|p4d|pud)_page, pgd_page_vaddr() and (p4d|pud)_pgtable
config: i386-allnoconfig (https://download.01.org/0day-ci/archive/20260709/202607092000.jvTf3jGx-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260709/202607092000.jvTf3jGx-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202607092000.jvTf3jGx-lkp@intel.com/
All warnings (new ones prefixed by >>):
arch/x86/mm/pgtable.c: In function 'pgd_prepopulate_pmd':
>> arch/x86/mm/pgtable.c:250:23: warning: variable 'pudp_s' set but not used [-Wunused-but-set-variable]
250 | pud_t *pudp, *pudp_s;
| ^~~~~~
vim +/pudp_s +250 arch/x86/mm/pgtable.c
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 246
0a3c7e279b112f Yeoreum Yun 2026-07-08 247 static void pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgdp, pmd_t *pmds[])
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 248 {
0a3c7e279b112f Yeoreum Yun 2026-07-08 249 p4d_t *p4dp, *p4dp_s;
0a3c7e279b112f Yeoreum Yun 2026-07-08 @250 pud_t *pudp, *pudp_s;
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 251 int i;
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 252
0a3c7e279b112f Yeoreum Yun 2026-07-08 253 p4dp = p4d_offset(pgdp, 0);
0a3c7e279b112f Yeoreum Yun 2026-07-08 254 pudp = pud_offset(p4dp, 0);
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 255
0a3c7e279b112f Yeoreum Yun 2026-07-08 256 for (i = 0; i < PREALLOCATED_PMDS; i++, pudp++) {
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 257 pmd_t *pmd = pmds[i];
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 258
0a3c7e279b112f Yeoreum Yun 2026-07-08 259 if (i >= KERNEL_PGD_BOUNDARY) {
0a3c7e279b112f Yeoreum Yun 2026-07-08 260 p4dp_s = p4d_offset(&swapper_pg_dir[i], 0);
0a3c7e279b112f Yeoreum Yun 2026-07-08 261 pudp_s = pud_offset(p4dp_s, 0);
0a3c7e279b112f Yeoreum Yun 2026-07-08 262
0a3c7e279b112f Yeoreum Yun 2026-07-08 263 memcpy(pmd, (pmd_t *)pud_pgtable(pudp_get(pudp_s)),
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 264 sizeof(pmd_t) * PTRS_PER_PMD);
0a3c7e279b112f Yeoreum Yun 2026-07-08 265 }
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 266
0a3c7e279b112f Yeoreum Yun 2026-07-08 267 pud_populate(mm, pudp, pmd);
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 268 }
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 269 }
1ec1fe73dfb711 Ingo Molnar 2008-03-19 270
:::::: The code at line 250 was first introduced by commit
:::::: 0a3c7e279b112f82e4a7a2a24e499fe971b871a3 x86: mm: remove usage of pgd_page_vaddr() for CONFIG_x86_PAE
:::::: TO: Yeoreum Yun <yeoreum.yun@arm.com>
:::::: CC: David Hildenbrand (Arm) <david@kernel.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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