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Hello, I think these variables are needed and they are referenced in main.c within the radix-tree directory. With these lines removed and running make within tools/testing/radix-tree I get the following errors: /usr/bin/ld: /home/ubuntu/linux-sidhakum-public/tools/testing/radix-tree/main.c:74:(.text+0x57a): undefined reference to `test_verbose' /usr/bin/ld: main.o: in function `check_copied_tags': /home/ubuntu/linux-sidhakum-public/tools/testing/radix-tree/main.c:135:(.text+0xc3f): undefined reference to `test_verbose' /home/ubuntu/linux-sidhakum-public/tools/testing/radix-tree/main.c:243:(.text+0x1d68): undefined reference to `preempt_count' /usr/bin/ld: /home/ubuntu/linux-sidhakum-public/tools/testing/radix-tree/main.c:243:(.text+0x1d8d): undefined reference to `preempt_count' adding back these variables allows make to run successfully again. Thanks, Sidhartha Kumar > > Signed-off-by: Ba Jing > --- > tools/testing/shared/linux.c | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/tools/testing/shared/linux.c b/tools/testing/shared/linux.c > index 17263696b5d8..eb1b1878cf64 100644 > --- a/tools/testing/shared/linux.c > +++ b/tools/testing/shared/linux.c > @@ -13,8 +13,6 @@ > #include > > int nr_allocated; > -int preempt_count; > -int test_verbose; > > struct kmem_cache { > pthread_mutex_t lock;