Re: [PATCH next v2 11/11] minmax: min() and max() don't need to return constant expressions
From: kernel test robot
Date: Mon Feb 26 2024 - 05:06:22 EST
Hi David,
kernel test robot noticed the following build warnings:
[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on linux/master mkl-can-next/testing kdave/for-next akpm-mm/mm-nonmm-unstable linus/master v6.8-rc6]
[cannot apply to next-20240223 dtor-input/next dtor-input/for-linus axboe-block/for-next horms-ipvs/master next-20240223]
[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/David-Laight/minmax-Put-all-the-clamp-definitions-together/20240226-005902
base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link: https://lore.kernel.org/r/a18dcae310f74dcb9c6fc01d5bdc0568%40AcuMS.aculab.com
patch subject: [PATCH next v2 11/11] minmax: min() and max() don't need to return constant expressions
config: i386-buildonly-randconfig-001-20240226 (https://download.01.org/0day-ci/archive/20240226/202402261720.EAMC0eHM-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240226/202402261720.EAMC0eHM-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/202402261720.EAMC0eHM-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
>> arch/x86/mm/pgtable.c:437:14: warning: variable length array used [-Wvla]
437 | pmd_t *pmds[MAX_PREALLOCATED_PMDS];
| ^~~~~~~~~~~~~~~~~~~~~
arch/x86/mm/pgtable.c:180:31: note: expanded from macro 'MAX_PREALLOCATED_PMDS'
180 | #define MAX_PREALLOCATED_PMDS MAX_UNSHARED_PTRS_PER_PGD
| ^~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/mm/pgtable.c:113:2: note: expanded from macro 'MAX_UNSHARED_PTRS_PER_PGD'
113 | max_t(size_t, KERNEL_PGD_BOUNDARY, PTRS_PER_PGD)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:152:27: note: expanded from macro 'max_t'
152 | #define max_t(type, x, y) __careful_cmp(max, (type)(x), (type)(y), __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:62:2: note: expanded from macro '__careful_cmp'
59 | #define __careful_cmp(op, x, y, uniq) ({ \
| ~~~~~~~~~~~
60 | _Static_assert(__types_ok(x, y), \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
61 | #op "(" #x ", " #y ") signedness error, fix types or consider u" #op "() before " #op "_t()"); \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
62 | __cmp_once(op, x, y, uniq); })
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:57:2: note: expanded from macro '__cmp_once'
57 | __cmp(op, __x_##uniq, __y_##uniq); })
| ^
include/linux/minmax.h:52:26: note: expanded from macro '__cmp'
52 | #define __cmp(op, x, y) ((x) __cmp_op_##op (y) ? (x) : (y))
| ^
1 warning generated.
vim +437 arch/x86/mm/pgtable.c
1db491f77b6ed0 Fenghua Yu 2015-01-15 432
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 433 pgd_t *pgd_alloc(struct mm_struct *mm)
1ec1fe73dfb711 Ingo Molnar 2008-03-19 434 {
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 435 pgd_t *pgd;
184d47f0fd3651 Kees Cook 2018-10-08 436 pmd_t *u_pmds[MAX_PREALLOCATED_USER_PMDS];
184d47f0fd3651 Kees Cook 2018-10-08 @437 pmd_t *pmds[MAX_PREALLOCATED_PMDS];
1ec1fe73dfb711 Ingo Molnar 2008-03-19 438
1db491f77b6ed0 Fenghua Yu 2015-01-15 439 pgd = _pgd_alloc();
1ec1fe73dfb711 Ingo Molnar 2008-03-19 440
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 441 if (pgd == NULL)
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 442 goto out;
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 443
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 444 mm->pgd = pgd;
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 445
25226df4b9be7f Gustavo A. R. Silva 2022-09-21 446 if (sizeof(pmds) != 0 &&
25226df4b9be7f Gustavo A. R. Silva 2022-09-21 447 preallocate_pmds(mm, pmds, PREALLOCATED_PMDS) != 0)
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 448 goto out_free_pgd;
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 449
25226df4b9be7f Gustavo A. R. Silva 2022-09-21 450 if (sizeof(u_pmds) != 0 &&
25226df4b9be7f Gustavo A. R. Silva 2022-09-21 451 preallocate_pmds(mm, u_pmds, PREALLOCATED_USER_PMDS) != 0)
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 452 goto out_free_pmds;
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 453
f59dbe9ca6707e Joerg Roedel 2018-07-18 454 if (paravirt_pgd_alloc(mm) != 0)
f59dbe9ca6707e Joerg Roedel 2018-07-18 455 goto out_free_user_pmds;
f59dbe9ca6707e Joerg Roedel 2018-07-18 456
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 457 /*
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 458 * Make sure that pre-populating the pmds is atomic with
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 459 * respect to anything walking the pgd_list, so that they
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 460 * never see a partially populated pgd.
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 461 */
a79e53d85683c6 Andrea Arcangeli 2011-02-16 462 spin_lock(&pgd_lock);
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 463
617d34d9e5d832 Jeremy Fitzhardinge 2010-09-21 464 pgd_ctor(mm, pgd);
25226df4b9be7f Gustavo A. R. Silva 2022-09-21 465 if (sizeof(pmds) != 0)
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 466 pgd_prepopulate_pmd(mm, pgd, pmds);
25226df4b9be7f Gustavo A. R. Silva 2022-09-21 467
25226df4b9be7f Gustavo A. R. Silva 2022-09-21 468 if (sizeof(u_pmds) != 0)
f59dbe9ca6707e Joerg Roedel 2018-07-18 469 pgd_prepopulate_user_pmd(mm, pgd, u_pmds);
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 470
a79e53d85683c6 Andrea Arcangeli 2011-02-16 471 spin_unlock(&pgd_lock);
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 472
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 473 return pgd;
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 474
f59dbe9ca6707e Joerg Roedel 2018-07-18 475 out_free_user_pmds:
25226df4b9be7f Gustavo A. R. Silva 2022-09-21 476 if (sizeof(u_pmds) != 0)
f59dbe9ca6707e Joerg Roedel 2018-07-18 477 free_pmds(mm, u_pmds, PREALLOCATED_USER_PMDS);
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 478 out_free_pmds:
25226df4b9be7f Gustavo A. R. Silva 2022-09-21 479 if (sizeof(pmds) != 0)
f59dbe9ca6707e Joerg Roedel 2018-07-18 480 free_pmds(mm, pmds, PREALLOCATED_PMDS);
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 481 out_free_pgd:
1db491f77b6ed0 Fenghua Yu 2015-01-15 482 _pgd_free(pgd);
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 483 out:
d8d5900ef8afc5 Jeremy Fitzhardinge 2008-06-25 484 return NULL;
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 485 }
4f76cd382213b2 Jeremy Fitzhardinge 2008-03-17 486
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