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Tue, 19 May 2026 23:47:13 -0700 (PDT) From: "Mukesh Kumar Chaurasiya (IBM)" To: maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, peterz@infradead.org, jpoimboe@kernel.org, jbaron@akamai.com, aliceryhl@google.com, rostedt@goodmis.org, ardb@kernel.org, ojeda@kernel.org, boqun@kernel.org, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, tmgross@umich.edu, dakr@kernel.org, nathan@kernel.org, nick.desaulniers+lkml@gmail.com, morbo@google.com, justinstitt@google.com, daniel.almeida@collabora.com, acourbot@nvidia.com, fujita.tomonori@gmail.com, gregkh@linuxfoundation.org, prafulrai522@gmail.com, tamird@kernel.org, kees@kernel.org, mkchauras@gmail.com, lyude@redhat.com, airlied@gmail.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, llvm@lists.linux.dev Cc: =?UTF-8?q?Christian=20K=C3=B6nig?= Subject: [PATCH V16 2/7] dma-resv: Fix undefined symbol when CONFIG_DMA_SHARED_BUFFER is disabled Date: Wed, 20 May 2026 12:16:24 +0530 Message-ID: <20260520064630.1785283-3-mkchauras@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260520064630.1785283-1-mkchauras@gmail.com> References: <20260520064630.1785283-1-mkchauras@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When building with LLVM=1 for architectures like powerpc where CONFIG_DMA_SHARED_BUFFER is not enabled, the build fails with: ld.lld: error: undefined symbol: dma_resv_reset_max_fences >>> referenced by helpers.c >>> rust/helpers/helpers.o:(rust_helper_dma_resv_unlock) The issue occurs because: 1. CONFIG_DEBUG_MUTEXES=y is enabled 2. CONFIG_DMA_SHARED_BUFFER is not enabled 3. dma_resv_reset_max_fences() is declared in the header when CONFIG_DEBUG_MUTEXES is set 4. But the function is only compiled in drivers/dma-buf/dma-resv.c, which is only built when CONFIG_DMA_SHARED_BUFFER is enabled 5. Rust helpers call dma_resv_unlock() which calls dma_resv_reset_max_fences(), causing an undefined symbol Fix this by compiling `dma-resv.c` file only when CONFIG_DMA_SHARED_BUFFER is enabled. Fixes: 9b836641d3bf ("rust: helpers: Add bindings/wrappers for dma_resv_lock") Reviewed-by: Christian König Reviewed-by: Gary Guo Signed-off-by: Mukesh Kumar Chaurasiya (IBM) --- rust/helpers/helpers.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c index 625921e27dfb..09ee5cac600d 100644 --- a/rust/helpers/helpers.c +++ b/rust/helpers/helpers.c @@ -57,7 +57,9 @@ #include "cred.c" #include "device.c" #include "dma.c" +#ifdef CONFIG_DMA_SHARED_BUFFER #include "dma-resv.c" +#endif #include "drm.c" #include "err.c" #include "irq.c" -- 2.54.0