Hi,
On Mon, Jun 05, 2023 at 08:01:01AM +0100, Mark Rutland wrote:
> Most architectures define the atomic/atomic64 xchg and cmpxchg
> operations in terms of arch_xchg and arch_cmpxchg respectfully.
>
> Add fallbacks for these cases and remove the trivial cases from arch
> code. On some architectures the existing definitions are kept as these
> are used to build other arch_atomic*() operations.
>
> Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx>
> Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
> Cc: Boqun Feng <boqun.feng@xxxxxxxxx>
> Cc: Paul E. McKenney <paulmck@xxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
This patch results in:
ERROR: modpost: "__xchg_called_with_bad_pointer" [lib/atomic64_test.ko] undefined!
when trying to build sparc64:allmodconfig.
Guenter
---
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# bad: [60e7c4a25da68cd826719b685babbd23e73b85b0] Add linux-next specific files for 20230626
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# bad: [cf1a0283badf6d0bfb91876583c24ef535a3c04c] Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
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# good: [b1fe7f2cda2a003afe316ce8dfe8d3645694a67e] x86,intel_iommu: Replace cmpxchg_double()
git bisect good b1fe7f2cda2a003afe316ce8dfe8d3645694a67e
# good: [14d72d4b6f0e88b5f683c1a5b7a876a55055852d] locking/atomic: remove fallback comments
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# first bad commit: [d12157efc8e083c77d054675fcdd594f54cc7e2b] locking/atomic: make atomic*_{cmp,}xchg optional
