arch/arm64/kvm/hyp/nvhe/trace.c:96:46: sparse: sparse: Using plain integer as NULL pointer

:::::: 
:::::: Manual check reason: "only suspicious fbc files changed"
:::::: 

BCC: [email protected]
CC: [email protected]
CC: [email protected]
TO: Vincent Donnefort <[email protected]>
CC: Marc Zyngier <[email protected]>

Hi Vincent,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2f1baf1fc8929e6c48370be543ad028ac7ad4131
commit: ce6a2badf58170bcf73489cd73981bb5775c1e22 KVM: arm64: Fix out-of-tree build for nVHE/pKVM tracing
date:   5 months ago
:::::: branch date: 16 hours ago
:::::: commit date: 5 months ago
config: arm64-randconfig-r133-20260814 (https://download.01.org/0day-ci/archive/20260814/[email protected]/config)
compiler: aarch64-linux-gcc (GCC) 11.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260814/[email protected]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Fixes: ce6a2badf581 ("KVM: arm64: Fix out-of-tree build for nVHE/pKVM tracing")
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/r/[email protected]/

sparse warnings: (new ones prefixed by >>)
>> arch/arm64/kvm/hyp/nvhe/trace.c:96:46: sparse: sparse: Using plain integer as NULL pointer

vim +96 arch/arm64/kvm/hyp/nvhe/trace.c

680a04c333fa29 Vincent Donnefort 2026-03-09  83  
680a04c333fa29 Vincent Donnefort 2026-03-09  84  static void hyp_trace_buffer_unload_bpage_backing(struct hyp_trace_buffer *trace_buffer)
680a04c333fa29 Vincent Donnefort 2026-03-09  85  {
680a04c333fa29 Vincent Donnefort 2026-03-09  86  	void *start = trace_buffer->bpages_backing_start;
680a04c333fa29 Vincent Donnefort 2026-03-09  87  	size_t size = trace_buffer->bpages_backing_size;
680a04c333fa29 Vincent Donnefort 2026-03-09  88  
680a04c333fa29 Vincent Donnefort 2026-03-09  89  	if (!size)
680a04c333fa29 Vincent Donnefort 2026-03-09  90  		return;
680a04c333fa29 Vincent Donnefort 2026-03-09  91  
680a04c333fa29 Vincent Donnefort 2026-03-09  92  	memset(start, 0, size);
680a04c333fa29 Vincent Donnefort 2026-03-09  93  
680a04c333fa29 Vincent Donnefort 2026-03-09  94  	__release_host_mem(start, size);
680a04c333fa29 Vincent Donnefort 2026-03-09  95  
680a04c333fa29 Vincent Donnefort 2026-03-09 @96  	trace_buffer->bpages_backing_start = 0;
680a04c333fa29 Vincent Donnefort 2026-03-09  97  	trace_buffer->bpages_backing_size = 0;
680a04c333fa29 Vincent Donnefort 2026-03-09  98  }
680a04c333fa29 Vincent Donnefort 2026-03-09  99  

:::::: The code at line 96 was first introduced by commit
:::::: 680a04c333fa29bf92007efe11431be005e8c4bb KVM: arm64: Add tracing capability for the nVHE/pKVM hyp

:::::: TO: Vincent Donnefort <[email protected]>
:::::: CC: Marc Zyngier <[email protected]>

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