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SubjectRe: [PATCH 1/2] Move kfree_call_rcu() to slab_common.c
Hi Rao,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on rcu/rcu/next]
[also build test WARNING on v4.16 next-20180329]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/rao-shoaib-oracle-com/Move-kfree_rcu-out-of-rcu-code-and-use-kfree_bulk/20180402-135939
base: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

include/linux/init.h:134:6: sparse: attribute 'indirect_branch': unknown attribute
include/linux/init.h:135:5: sparse: attribute 'indirect_branch': unknown attribute
include/linux/init.h:268:6: sparse: attribute 'indirect_branch': unknown attribute
include/linux/init.h:269:6: sparse: attribute 'indirect_branch': unknown attribute
include/linux/printk.h:200:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/mem_encrypt.h:32:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/mem_encrypt.h:34:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/mem_encrypt.h:37:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/mem_encrypt.h:38:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/mem_encrypt.h:40:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/mem_encrypt.h:42:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/mem_encrypt.h:43:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/mem_encrypt.h:45:5: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/mem_encrypt.h:46:5: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/mem_encrypt.h:49:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/qspinlock.h:53:32: sparse: attribute 'indirect_branch': unknown attribute
include/linux/workqueue.h:646:5: sparse: attribute 'indirect_branch': unknown attribute
include/linux/workqueue.h:647:5: sparse: attribute 'indirect_branch': unknown attribute
include/linux/wait_bit.h:41:13: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/numa.h:34:12: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/numa.h:35:13: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/numa.h:62:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/vmalloc.h:64:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/vmalloc.h:173:8: sparse: attribute 'indirect_branch': unknown attribute
include/linux/vmalloc.h:174:8: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/fixmap.h:174:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/fixmap.h:176:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/fixmap.h:178:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/fixmap.h:180:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/apic.h:254:13: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/apic.h:430:13: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/io_apic.h:184:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/smp.h:113:6: sparse: attribute 'indirect_branch': unknown attribute
include/linux/smp.h:125:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/smp.h:126:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/percpu.h:110:33: sparse: attribute 'indirect_branch': unknown attribute
include/linux/percpu.h:112:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/percpu.h:114:12: sparse: attribute 'indirect_branch': unknown attribute
include/linux/percpu.h:118:12: sparse: attribute 'indirect_branch': unknown attribute
include/linux/percpu.h:126:12: sparse: attribute 'indirect_branch': unknown attribute
include/linux/fs.h:63:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/fs.h:64:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/fs.h:65:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/fs.h:66:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/memory_hotplug.h:221:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/mmzone.h:1292:15: sparse: attribute 'indirect_branch': unknown attribute
include/linux/fs.h:2421:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/fs.h:2422:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/fs.h:3329:5: sparse: attribute 'indirect_branch': unknown attribute
include/linux/hrtimer.h:497:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/kmemleak.h:29:33: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/kasan.h:29:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/kasan.h:30:6: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/pgtable.h:28:5: sparse: attribute 'indirect_branch': unknown attribute
include/linux/slab.h:135:6: sparse: attribute 'indirect_branch': unknown attribute
include/linux/slab.h:758:6: sparse: attribute 'indirect_branch': unknown attribute
include/linux/mm.h:1753:6: sparse: attribute 'indirect_branch': unknown attribute
include/linux/mm.h:1941:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/mm.h:2083:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/mm.h:2671:6: sparse: attribute 'indirect_branch': unknown attribute
include/linux/swiotlb.h:39:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/swiotlb.h:124:13: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/swiotlb.h:9:12: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/swiotlb.h:10:12: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/swiotlb.h:11:13: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/swiotlb.h:12:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/dma-contiguous.h:85:5: sparse: attribute 'indirect_branch': unknown attribute
arch/x86/include/asm/vdso.h:44:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/cred.h:167:13: sparse: attribute 'indirect_branch': unknown attribute
include/linux/nsproxy.h:74:5: sparse: attribute 'indirect_branch': unknown attribute
include/linux/io.h:47:6: sparse: attribute 'indirect_branch': unknown attribute
include/linux/netdevice.h:302:5: sparse: attribute 'indirect_branch': unknown attribute
include/linux/netdevice.h:4056:5: sparse: attribute 'indirect_branch': unknown attribute
include/linux/ftrace.h:462:6: sparse: attribute 'indirect_branch': unknown attribute
include/trace/events/bpf.h:59:1: sparse: attribute 'indirect_branch': unknown attribute
include/trace/events/bpf.h:95:1: sparse: attribute 'indirect_branch': unknown attribute
include/trace/events/bpf.h:120:1: sparse: attribute 'indirect_branch': unknown attribute
include/trace/events/bpf.h:150:1: sparse: attribute 'indirect_branch': unknown attribute
include/trace/events/bpf.h:191:1: sparse: attribute 'indirect_branch': unknown attribute
include/trace/events/bpf.h:231:1: sparse: attribute 'indirect_branch': unknown attribute
include/trace/events/bpf.h:285:1: sparse: attribute 'indirect_branch': unknown attribute
include/trace/events/bpf.h:315:1: sparse: attribute 'indirect_branch': unknown attribute
include/trace/events/xdp.h:28:1: sparse: attribute 'indirect_branch': unknown attribute
include/trace/events/xdp.h:53:1: sparse: attribute 'indirect_branch': unknown attribute
include/trace/events/xdp.h:155:1: sparse: attribute 'indirect_branch': unknown attribute
include/trace/events/xdp.h:190:1: sparse: attribute 'indirect_branch': unknown attribute
kernel/bpf/core.c:1546:31: sparse: incorrect type in return expression (different address spaces) @@ expected struct bpf_prog_array [noderef] <asn:4>* @@ got sn:4>* @@
kernel/bpf/core.c:1546:31: expected struct bpf_prog_array [noderef] <asn:4>*
kernel/bpf/core.c:1546:31: got void *
kernel/bpf/core.c:1550:17: sparse: incorrect type in return expression (different address spaces) @@ expected struct bpf_prog_array [noderef] <asn:4>* @@ got rray [noderef] <asn:4>* @@
kernel/bpf/core.c:1550:17: expected struct bpf_prog_array [noderef] <asn:4>*
kernel/bpf/core.c:1550:17: got struct bpf_prog_array *<noident>
>> kernel/bpf/core.c:1558:9: sparse: cast removes address space of expression
kernel/bpf/core.c:1621:34: sparse: incorrect type in initializer (different address spaces) @@ expected struct bpf_prog **prog @@ got struct bpf_prog *struct bpf_prog **prog @@
kernel/bpf/core.c:1621:34: expected struct bpf_prog **prog
kernel/bpf/core.c:1621:34: got struct bpf_prog *[noderef] <asn:4>*<noident>
kernel/bpf/core.c:1644:31: sparse: incorrect type in assignment (different address spaces) @@ expected struct bpf_prog **existing_prog @@ got struct bpf_prog *struct bpf_prog **existing_prog @@
kernel/bpf/core.c:1644:31: expected struct bpf_prog **existing_prog
kernel/bpf/core.c:1644:31: got struct bpf_prog *[noderef] <asn:4>*<noident>
kernel/bpf/core.c:1666:15: sparse: incorrect type in assignment (different address spaces) @@ expected struct bpf_prog_array *array @@ got struct bpf_prog_astruct bpf_prog_array *array @@
kernel/bpf/core.c:1666:15: expected struct bpf_prog_array *array
kernel/bpf/core.c:1666:15: got struct bpf_prog_array [noderef] <asn:4>*
kernel/bpf/core.c:1672:31: sparse: incorrect type in assignment (different address spaces) @@ expected struct bpf_prog **[assigned] existing_prog @@ got structstruct bpf_prog **[assigned] existing_prog @@
kernel/bpf/core.c:1672:31: expected struct bpf_prog **[assigned] existing_prog
kernel/bpf/core.c:1672:31: got struct bpf_prog *[noderef] <asn:4>*<noident>
include/trace/events/bpf.h:59:1: sparse: Using plain integer as NULL pointer
include/trace/events/bpf.h:95:1: sparse: Using plain integer as NULL pointer
include/trace/events/bpf.h:120:1: sparse: Using plain integer as NULL pointer
include/trace/events/bpf.h:191:1: sparse: Using plain integer as NULL pointer
include/trace/events/bpf.h:231:1: sparse: Using plain integer as NULL pointer
include/trace/events/bpf.h:285:1: sparse: Using plain integer as NULL pointer
include/trace/events/bpf.h:315:1: sparse: too many warnings

vim +1558 kernel/bpf/core.c

324bda9e6c Alexei Starovoitov 2017-10-02 1542
324bda9e6c Alexei Starovoitov 2017-10-02 1543 struct bpf_prog_array __rcu *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags)
324bda9e6c Alexei Starovoitov 2017-10-02 1544 {
324bda9e6c Alexei Starovoitov 2017-10-02 1545 if (prog_cnt)
324bda9e6c Alexei Starovoitov 2017-10-02 @1546 return kzalloc(sizeof(struct bpf_prog_array) +
324bda9e6c Alexei Starovoitov 2017-10-02 1547 sizeof(struct bpf_prog *) * (prog_cnt + 1),
324bda9e6c Alexei Starovoitov 2017-10-02 1548 flags);
324bda9e6c Alexei Starovoitov 2017-10-02 1549
324bda9e6c Alexei Starovoitov 2017-10-02 1550 return &empty_prog_array.hdr;
324bda9e6c Alexei Starovoitov 2017-10-02 1551 }
324bda9e6c Alexei Starovoitov 2017-10-02 1552
324bda9e6c Alexei Starovoitov 2017-10-02 1553 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs)
324bda9e6c Alexei Starovoitov 2017-10-02 1554 {
324bda9e6c Alexei Starovoitov 2017-10-02 1555 if (!progs ||
324bda9e6c Alexei Starovoitov 2017-10-02 1556 progs == (struct bpf_prog_array __rcu *)&empty_prog_array.hdr)
324bda9e6c Alexei Starovoitov 2017-10-02 1557 return;
324bda9e6c Alexei Starovoitov 2017-10-02 @1558 kfree_rcu(progs, rcu);
324bda9e6c Alexei Starovoitov 2017-10-02 1559 }
324bda9e6c Alexei Starovoitov 2017-10-02 1560

:::::: The code at line 1558 was first introduced by commit
:::::: 324bda9e6c5add86ba2e1066476481c48132aca0 bpf: multi program support for cgroup+bpf

:::::: TO: Alexei Starovoitov <ast@fb.com>
:::::: CC: David S. Miller <davem@davemloft.net>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation

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