{"id":2228353,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2228353/?format=json","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/1.1/projects/2/?format=json","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/"},"msgid":"<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/1.1/people/92575/?format=json","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/1.1/series/501515/?format=json","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":{},"headers":{"Return-Path":"\n ","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 \nSigned-off-by: Mukesh Kumar Chaurasiya (IBM) \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"]}