From 04547d665943721e3761fa87a18aeb899eb7fac8 Mon Sep 17 00:00:00 2001 From: Sudeep Holla Date: Wed, 20 Jul 2022 13:55:38 +0100 Subject: [PATCH] cacheinfo: Use atomic allocation for percpu cache attributes On couple of architectures like RISC-V and ARM64, we need to detect cache attribues quite early during the boot when the secondary CPUs start. So we will call detect_cache_attributes in the atomic context and since use of normal allocation can sleep, we will end up getting "sleeping in the atomic context" bug splat. In order avoid that, move the allocation to use atomic version in preparation to move the actual detection of cache attributes in the CPU hotplug path which is atomic. Cc: Ionela Voinescu Tested-by: Conor Dooley Signed-off-by: Sudeep Holla Link: https://lore.kernel.org/r/20220720-arch_topo_fixes-v3-1-43d696288e84@arm.com Signed-off-by: Greg Kroah-Hartman --- drivers/base/cacheinfo.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c index 65d566ff24c41..4b5cd08c5a657 100644 --- a/drivers/base/cacheinfo.c +++ b/drivers/base/cacheinfo.c @@ -356,7 +356,7 @@ int detect_cache_attributes(unsigned int cpu) return -ENOENT; per_cpu_cacheinfo(cpu) = kcalloc(cache_leaves(cpu), - sizeof(struct cacheinfo), GFP_KERNEL); + sizeof(struct cacheinfo), GFP_ATOMIC); if (per_cpu_cacheinfo(cpu) == NULL) { cache_leaves(cpu) = 0; return -ENOMEM; -- 2.39.5