Re: [PATCH] powerpc/drmem: Don't compute the NUMA node for each LMB

From: Laurent Dufour
Date: Wed Aug 05 2020 - 15:47:45 EST


Le 05/08/2020 à 12:43, kernel test robot a écrit :
Hi Laurent,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on powerpc/next]
[also build test ERROR on linux/master linus/master v5.8 next-20200804]
[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]

url: https://github.com/0day-ci/linux/commits/Laurent-Dufour/powerpc-drmem-Don-t-compute-the-NUMA-node-for-each-LMB/20200805-173213
base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-mpc885_ads_defconfig (attached as .config)
compiler: powerpc-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

arch/powerpc/mm/drmem.c: In function 'init_drmem_v2_lmbs':
arch/powerpc/mm/drmem.c:457:8: error: 'struct drmem_lmb' has no member named 'nid'
457 | lmb->nid = first->nid;
| ^~
arch/powerpc/mm/drmem.c:457:21: error: 'struct drmem_lmb' has no member named 'nid'
457 | lmb->nid = first->nid;
| ^~

My mistake, the nid member is only present when CONFIG_MEMORY_HOTPLUG is set.

I'll send a new version fixing this.


vim +457 arch/powerpc/mm/drmem.c

397
398 static void __init init_drmem_v2_lmbs(const __be32 *prop)
399 {
400 struct drmem_lmb *lmb, *first;
401 struct of_drconf_cell_v2 dr_cell;
402 const __be32 *p;
403 u32 i, j, lmb_sets;
404 int lmb_index;
405
406 lmb_sets = of_read_number(prop++, 1);
407 if (lmb_sets == 0)
408 return;
409
410 /* first pass, calculate the number of LMBs */
411 p = prop;
412 for (i = 0; i < lmb_sets; i++) {
413 read_drconf_v2_cell(&dr_cell, &p);
414 drmem_info->n_lmbs += dr_cell.seq_lmbs;
415 }
416
417 drmem_info->lmbs = kcalloc(drmem_info->n_lmbs, sizeof(*lmb),
418 GFP_KERNEL);
419 if (!drmem_info->lmbs)
420 return;
421
422 /* second pass, read in the LMB information */
423 lmb_index = 0;
424 p = prop;
425 first = NULL;
426
427 for (i = 0; i < lmb_sets; i++) {
428 read_drconf_v2_cell(&dr_cell, &p);
429
430 /*
431 * Fetch the NUMA node id for the fist set or if the
432 * associativity index is different from the previous set.
433 */
434 if (first && dr_cell.aa_index != first->aa_index)
435 first = NULL;
436
437 for (j = 0; j < dr_cell.seq_lmbs; j++) {
438 lmb = &drmem_info->lmbs[lmb_index++];
439
440 lmb->base_addr = dr_cell.base_addr;
441 dr_cell.base_addr += drmem_info->lmb_size;
442
443 lmb->drc_index = dr_cell.drc_index;
444 dr_cell.drc_index++;
445
446 lmb->aa_index = dr_cell.aa_index;
447 lmb->flags = dr_cell.flags;
448
449 /*
450 * All the LMB in the set share the same NUMA
451 * associativity property. So read that node only once.
452 */
453 if (!first) {
454 lmb_set_nid(lmb);
455 first = lmb;
456 } else {
> 457 lmb->nid = first->nid;
458 }
459 }
460 }
461 }
462

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