Re: [linux-next:master] BUILD REGRESSION a54df7622717a40ddec95fd98086aff8ba7839a6

On 1/24/23 12:28 PM, Andrew Morton wrote:

On Wed, 25 Jan 2023 00:37:05 +0800 kernel test robot [off-list ref] wrote:

quoted

tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
branch HEAD: a54df7622717a40ddec95fd98086aff8ba7839a6  Add linux-next specific files for 20230124

Error/Warning: (recently discovered and may have been fixed)

ERROR: modpost: "devm_platform_ioremap_resource" [drivers/dma/fsl-edma.ko] undefined!
ERROR: modpost: "devm_platform_ioremap_resource" [drivers/dma/idma64.ko] undefined!
drivers/gpu/drm/amd/amdgpu/../display/dc/link/link_dp_training.c:1585:38: warning: variable 'result' set but not used [-Wunused-but-set-variable]

Unverified Error/Warning (likely false positive, please contact us if interested):

...

mm/hugetlb.c:3100 alloc_hugetlb_folio() error: uninitialized symbol 'h_cg'.

	hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, folio);

The warning looks to be bogus.  I guess we could put a "= NULL" in
there to keep the compiler quiet?

This could be because if CONFIG_CGROUP_HUGETLB is not set, the function in alloc_hugetlb_folio() which initializes h_cg just returns 0

static inline int hugetlb_cgroup_charge_cgroup_rsvd(int idx,
				unsigned long nr_pages,
				struct hugetlb_cgroup **ptr)
{
	return 0;
}

where ptr is h_cg. I can add a "= NULL" in the v2 of my hugetlb page fault conversion series.