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This commit is contained in:
Andy Ritger
2024-11-24 15:32:26 -08:00
parent 7d3cbfe254
commit 7a6a5a1f9a
42 changed files with 331 additions and 215 deletions
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41
kernel-open/nvidia-uvm/uvm_linux.h
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@@ -228,47 +228,6 @@ static inline const struct cpumask *uvm_cpumask_of_node(int node)
#define NV_UVM_GFP_FLAGS (GFP_KERNEL)
// Develop builds define DEBUG but enable optimization
#if defined(DEBUG) && !defined(NVIDIA_UVM_DEVELOP)
// Wrappers for functions not building correctly without optimizations on,
// implemented in uvm_debug_optimized.c. Notably the file is only built for
// debug builds, not develop or release builds.
// Unoptimized builds of atomic_xchg() hit a BUILD_BUG() on arm64 as it relies
// on __xchg being completely inlined:
// /usr/src/linux-3.12.19/arch/arm64/include/asm/cmpxchg.h:67:3: note: in expansion of macro 'BUILD_BUG'
//
// Powerppc hits a similar issue, but ends up with an undefined symbol:
// WARNING: "__xchg_called_with_bad_pointer" [...] undefined!
int nv_atomic_xchg(atomic_t *val, int new);
// Same problem as atomic_xchg() on powerppc:
// WARNING: "__cmpxchg_called_with_bad_pointer" [...] undefined!
int nv_atomic_cmpxchg(atomic_t *val, int old, int new);
// Same problem as atomic_xchg() on powerppc:
// WARNING: "__cmpxchg_called_with_bad_pointer" [...] undefined!
long nv_atomic_long_cmpxchg(atomic_long_t *val, long old, long new);
// This Linux kernel commit:
// 2016-08-30 0d025d271e55f3de21f0aaaf54b42d20404d2b23
// leads to build failures on x86_64, when compiling without optimization. Avoid
// that problem, by providing our own builds of copy_from_user / copy_to_user,
// for debug (non-optimized) UVM builds. Those are accessed via these
// nv_copy_to/from_user wrapper functions.
//
// Bug 1849583 has further details.
unsigned long nv_copy_from_user(void *to, const void __user *from, unsigned long n);
unsigned long nv_copy_to_user(void __user *to, const void *from, unsigned long n);
#else
#define nv_atomic_xchg atomic_xchg
#define nv_atomic_cmpxchg atomic_cmpxchg
#define nv_atomic_long_cmpxchg atomic_long_cmpxchg
#define nv_copy_to_user copy_to_user
#define nv_copy_from_user copy_from_user
#endif
#ifndef NV_ALIGN_DOWN
#define NV_ALIGN_DOWN(v,g) ((v) & ~((g) - 1))
#endif