From: David Hildenbrand <david@xxxxxxxxxx> mm/cma: print RHEL-specific warnings when CMA is first invoked Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1945002 Upstream: RHEL only CMA is Tech Preview in RHEL 9; to detect the use of CMA easily, let's print warninigs when * Activating a CMA region succeeds * cma_alloc() is called for the first time * cma_release() is called for the first time Print when cma_alloc()/cma_release() will actually do some work; for example, cma_release() is sometimes called for memory regions even though the memory isn't managed by CMA. Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> diff a/mm/cma.c b/mm/cma.c --- a/mm/cma.c +++ b/mm/cma.c @@ -125,6 +125,12 @@ static void __init cma_activate_area(struct cma *cma) spin_lock_init(&cma->mem_head_lock); #endif +#ifdef CONFIG_RHEL_DIFFERENCES + pr_warn("CMA area %s at [0x%llx-0x%llx] was activated\n", cma->name, + (unsigned long long)PFN_PHYS(cma->base_pfn), + (unsigned long long)PFN_PHYS(cma->base_pfn + cma->count) - 1); +#endif /* CONFIG_RHEL_DIFFERENCES */ + return; not_in_zone: @@ -437,6 +443,10 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align, if (!cma || !cma->count || !cma->bitmap) return NULL; +#ifdef CONFIG_RHEL_DIFFERENCES + pr_warn_once("%s() got called for the first time\n", __func__); +#endif /* CONFIG_RHEL_DIFFERENCES */ + pr_debug("%s(cma %p, count %zu, align %d)\n", __func__, (void *)cma, count, align); @@ -533,6 +543,10 @@ bool cma_release(struct cma *cma, const struct page *pages, unsigned int count) if (pfn < cma->base_pfn || pfn >= cma->base_pfn + cma->count) return false; +#ifdef CONFIG_RHEL_DIFFERENCES + pr_warn_once("%s() got called for the first time\n", __func__); +#endif /* CONFIG_RHEL_DIFFERENCES */ + VM_BUG_ON(pfn + count > cma->base_pfn + cma->count); free_contig_range(pfn, count); -- https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1023 _______________________________________________ kernel mailing list -- kernel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to kernel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/kernel@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
