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be809b60cb
linux/rust
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Mukesh Kumar Chaurasiya (IBM) be809b60cb dma-resv: Fix undefined symbol when CONFIG_DMA_SHARED_BUFFER is disabled 
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: 9b836641d3 ("rust: helpers: Add bindings/wrappers for dma_resv_lock")
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260708082454.1254320-3-mkchauras@gmail.com
2026-07-31 16:57:48 +05:30
..
bindings rust: allow suspicious_runtime_symbol_definitions lint for Rust >= 1.98 2026-06-29 13:02:15 +02:00
helpers dma-resv: Fix undefined symbol when CONFIG_DMA_SHARED_BUFFER is disabled 2026-07-31 16:57:48 +05:30
kernel rust: time: fix as_micros_ceil() to round correctly for negative Delta 2026-07-18 19:07:35 +02:00
macros rust: types: add ForLt trait for higher-ranked lifetime support 2026-05-27 16:24:59 +02:00
pin-init rust: pin_init: internal: use loop {} to produce never value 2026-05-29 21:58:36 +01:00
proc-macro2 rust: proc-macro2: rebuild if the version text changes 2026-01-23 10:44:27 +01:00
quote rust: quote: add README.md 2025-11-24 17:15:43 +01:00
syn rust: syn: add README.md 2025-11-24 17:15:47 +01:00
uapi rust: allow suspicious_runtime_symbol_definitions lint for Rust >= 1.98 2026-06-29 13:02:15 +02:00
zerocopy rust: zerocopy: update to v0.8.54 2026-07-11 13:46:02 +02:00
zerocopy-derive rust: zerocopy: update to v0.8.54 2026-07-11 13:46:02 +02:00
.gitignore
.kunitconfig rust: add kunitconfig 2025-03-19 23:22:21 +01:00
bindgen_parameters rust/bindgen_parameters: Mark s390 types as opaque to prevent repr conflicts 2026-06-10 16:25:13 +02:00
build_error.rs
compiler_builtins.rs ARM: 9441/1: rust: Enable Rust support for ARMv7 2025-03-26 13:31:16 +00:00
exports.c kbuild: rust: provide an option to inline C helpers into Rust 2026-03-30 02:03:52 +02:00
ffi.rs rust: replace CStr with core::ffi::CStr 2025-10-22 07:47:27 +02:00
Makefile rust: Fix "multiple candidates for rmeta dependency core" error 2026-07-31 16:57:47 +05:30