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GET /api/patches/2228353/?format=api
{ "id": 2228353, "url": "http://patchwork.ozlabs.org/api/patches/2228353/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260426085725.2090827-3-mkchauras@gmail.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260426085725.2090827-3-mkchauras@gmail.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260426085725.2090827-3-mkchauras@gmail.com/", "date": "2026-04-26T08:57:20", "name": "[V14,2/7] dma-resv: Fix undefined symbol when CONFIG_DMA_SHARED_BUFFER is disabled", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "da3a7f3e1b79314f8cae7e858cff510832182eb1", "submitter": { "id": 92575, "url": "http://patchwork.ozlabs.org/api/people/92575/?format=api", "name": "Mukesh Kumar Chaurasiya", "email": "mkchauras@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260426085725.2090827-3-mkchauras@gmail.com/mbox/", "series": [ { "id": 501515, "url": "http://patchwork.ozlabs.org/api/series/501515/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=501515", "date": "2026-04-26T08:57:18", "name": "Rust support for powerpc", "version": 14, "mbox": "http://patchwork.ozlabs.org/series/501515/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2228353/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2228353/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-20107-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=Ax1JXHpM;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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charset=UTF-8", "Content-Transfer-Encoding": "8bit", "X-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,\n\tSPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "When building with LLVM=1 for architectures like powerpc where\nCONFIG_DMA_SHARED_BUFFER is not enabled, the build fails with:\n\n ld.lld: error: undefined symbol: dma_resv_reset_max_fences\n >>> referenced by helpers.c\n >>> rust/helpers/helpers.o:(rust_helper_dma_resv_unlock)\n\nThe issue occurs because:\n1. CONFIG_DEBUG_MUTEXES=y is enabled\n2. CONFIG_DMA_SHARED_BUFFER is not enabled\n3. dma_resv_reset_max_fences() is declared in the header when\n CONFIG_DEBUG_MUTEXES is set\n4. But the function is only compiled in drivers/dma-buf/dma-resv.c,\n which is only built when CONFIG_DMA_SHARED_BUFFER is enabled\n5. Rust helpers call dma_resv_unlock() which calls\n dma_resv_reset_max_fences(), causing an undefined symbol\n\nFix this by compiling `dma-resv.c` file only when CONFIG_DMA_SHARED_BUFFER\nis enabled.\n\nFixes: 9b836641d3bf (\"rust: helpers: Add bindings/wrappers for dma_resv_lock\")\nReviewed-by: Christian König <christian.koenig@amd.com>\nSigned-off-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>\n---\n rust/helpers/helpers.c | 2 ++\n 1 file changed, 2 insertions(+)", "diff": "diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c\nindex 625921e27dfb..09ee5cac600d 100644\n--- a/rust/helpers/helpers.c\n+++ b/rust/helpers/helpers.c\n@@ -57,7 +57,9 @@\n #include \"cred.c\"\n #include \"device.c\"\n #include \"dma.c\"\n+#ifdef CONFIG_DMA_SHARED_BUFFER\n #include \"dma-resv.c\"\n+#endif\n #include \"drm.c\"\n #include \"err.c\"\n #include \"irq.c\"\n", "prefixes": [ "V14", "2/7" ] }