tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 6014cfa5bf32cf8c5c58b3cfd5ee0e1542c8a825 commit: efc9909fdce00a827a37609628223cd45bf95d0b [9199/10906] bpf, arm64: Add bpf trampoline for arm64 config: arm64-randconfig-s043-20220716 (https://download.01.org/0day-ci/archive/20220717/202207170002.kWlaJQkJ-lkp@xxxxxxxxx/config) compiler: aarch64-linux-gcc (GCC) 12.1.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-39-gce1a6720-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=efc9909fdce00a827a37609628223cd45bf95d0b git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout efc9909fdce00a827a37609628223cd45bf95d0b # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/net/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> sparse warnings: (new ones prefixed by >>) >> arch/arm64/net/bpf_jit_comp.c:1683:16: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned int [usertype] *branch @@ got restricted __le32 [usertype] * @@ arch/arm64/net/bpf_jit_comp.c:1683:16: sparse: expected unsigned int [usertype] *branch arch/arm64/net/bpf_jit_comp.c:1683:16: sparse: got restricted __le32 [usertype] * >> arch/arm64/net/bpf_jit_comp.c:1699:52: sparse: sparse: subtraction of different types can't work (different base types) >> arch/arm64/net/bpf_jit_comp.c:1733:29: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned int [usertype] * @@ got restricted __le32 [usertype] * @@ arch/arm64/net/bpf_jit_comp.c:1733:29: sparse: expected unsigned int [usertype] * arch/arm64/net/bpf_jit_comp.c:1733:29: sparse: got restricted __le32 [usertype] * arch/arm64/net/bpf_jit_comp.c:1917:52: sparse: sparse: subtraction of different types can't work (different base types) vim +1683 arch/arm64/net/bpf_jit_comp.c 1640 1641 static void invoke_bpf_prog(struct jit_ctx *ctx, struct bpf_tramp_link *l, 1642 int args_off, int retval_off, int run_ctx_off, 1643 bool save_ret) 1644 { 1645 u32 *branch; 1646 u64 enter_prog; 1647 u64 exit_prog; 1648 struct bpf_prog *p = l->link.prog; 1649 int cookie_off = offsetof(struct bpf_tramp_run_ctx, bpf_cookie); 1650 1651 if (p->aux->sleepable) { 1652 enter_prog = (u64)__bpf_prog_enter_sleepable; 1653 exit_prog = (u64)__bpf_prog_exit_sleepable; 1654 } else { 1655 enter_prog = (u64)__bpf_prog_enter; 1656 exit_prog = (u64)__bpf_prog_exit; 1657 } 1658 1659 if (l->cookie == 0) { 1660 /* if cookie is zero, one instruction is enough to store it */ 1661 emit(A64_STR64I(A64_ZR, A64_SP, run_ctx_off + cookie_off), ctx); 1662 } else { 1663 emit_a64_mov_i64(A64_R(10), l->cookie, ctx); 1664 emit(A64_STR64I(A64_R(10), A64_SP, run_ctx_off + cookie_off), 1665 ctx); 1666 } 1667 1668 /* save p to callee saved register x19 to avoid loading p with mov_i64 1669 * each time. 1670 */ 1671 emit_addr_mov_i64(A64_R(19), (const u64)p, ctx); 1672 1673 /* arg1: prog */ 1674 emit(A64_MOV(1, A64_R(0), A64_R(19)), ctx); 1675 /* arg2: &run_ctx */ 1676 emit(A64_ADD_I(1, A64_R(1), A64_SP, run_ctx_off), ctx); 1677 1678 emit_call(enter_prog, ctx); 1679 1680 /* if (__bpf_prog_enter(prog) == 0) 1681 * goto skip_exec_of_prog; 1682 */ > 1683 branch = ctx->image + ctx->idx; 1684 emit(A64_NOP, ctx); 1685 1686 /* save return value to callee saved register x20 */ 1687 emit(A64_MOV(1, A64_R(20), A64_R(0)), ctx); 1688 1689 emit(A64_ADD_I(1, A64_R(0), A64_SP, args_off), ctx); 1690 if (!p->jited) 1691 emit_addr_mov_i64(A64_R(1), (const u64)p->insnsi, ctx); 1692 1693 emit_call((const u64)p->bpf_func, ctx); 1694 1695 if (save_ret) 1696 emit(A64_STR64I(A64_R(0), A64_SP, retval_off), ctx); 1697 1698 if (ctx->image) { > 1699 int offset = &ctx->image[ctx->idx] - branch; 1700 *branch = A64_CBZ(1, A64_R(0), offset); 1701 } 1702 1703 /* arg1: prog */ 1704 emit(A64_MOV(1, A64_R(0), A64_R(19)), ctx); 1705 /* arg2: start time */ 1706 emit(A64_MOV(1, A64_R(1), A64_R(20)), ctx); 1707 /* arg3: &run_ctx */ 1708 emit(A64_ADD_I(1, A64_R(2), A64_SP, run_ctx_off), ctx); 1709 1710 emit_call(exit_prog, ctx); 1711 } 1712 1713 static void invoke_bpf_mod_ret(struct jit_ctx *ctx, struct bpf_tramp_links *tl, 1714 int args_off, int retval_off, int run_ctx_off, 1715 u32 **branches) 1716 { 1717 int i; 1718 1719 /* The first fmod_ret program will receive a garbage return value. 1720 * Set this to 0 to avoid confusing the program. 1721 */ 1722 emit(A64_STR64I(A64_ZR, A64_SP, retval_off), ctx); 1723 for (i = 0; i < tl->nr_links; i++) { 1724 invoke_bpf_prog(ctx, tl->links[i], args_off, retval_off, 1725 run_ctx_off, true); 1726 /* if (*(u64 *)(sp + retval_off) != 0) 1727 * goto do_fexit; 1728 */ 1729 emit(A64_LDR64I(A64_R(10), A64_SP, retval_off), ctx); 1730 /* Save the location of branch, and generate a nop. 1731 * This nop will be replaced with a cbnz later. 1732 */ > 1733 branches[i] = ctx->image + ctx->idx; 1734 emit(A64_NOP, ctx); 1735 } 1736 } 1737 -- 0-DAY CI Kernel Test Service https://01.org/lkp
