#include "clang.h" #include "clang-c.h" #include "llvm/IR/Function.h" #include "llvm/IR/LLVMContext.h" #include #include #include class perf_clang_scope { public: explicit perf_clang_scope() {perf_clang__init();} ~perf_clang_scope() {perf_clang__cleanup();} }; static std::unique_ptr __test__clang_to_IR(void) { unsigned int kernel_version; if (fetch_kernel_version(&kernel_version, NULL, 0)) return std::unique_ptr(nullptr); std::string cflag_kver("-DLINUX_VERSION_CODE=" + std::to_string(kernel_version)); std::unique_ptr M = perf::getModuleFromSource({cflag_kver.c_str()}, "perf-test.c", test_llvm__bpf_base_prog); return M; } extern "C" { int test__clang_to_IR(void) { perf_clang_scope _scope; auto M = __test__clang_to_IR(); if (!M) return -1; for (llvm::Function& F : *M) if (F.getName() == "bpf_func__SyS_epoll_wait") return 0; return -1; } int test__clang_to_obj(void) { perf_clang_scope _scope; auto M = __test__clang_to_IR(); if (!M) return -1; auto Buffer = perf::getBPFObjectFromModule(&*M); if (!Buffer) return -1; return 0; } } selected'>nds-private-remove net-next plumbingsTobias Klauser
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authorAndrei Vagin <avagin@openvz.org>2017-01-04 19:28:14 -0800
committerEric W. Biederman <ebiederm@xmission.com>2017-01-10 13:34:56 +1300
commitadd7c65ca426b7a37184dd3d2172394e23d585d6 (patch)
tree28b08b519540041b06ed0ab0b1c005076b932e8e /sound/oss
parent75422726b0f717d67db3283c2eb5bc14fa2619c5 (diff)
pid: fix lockdep deadlock warning due to ucount_lock
========================================================= [ INFO: possible irq lock inversion dependency detected ] 4.10.0-rc2-00024-g4aecec9-dirty #118 Tainted: G W --------------------------------------------------------- swapper/1/0 just changed the state of lock: (&(&sighand->siglock)->rlock){-.....}, at: [<ffffffffbd0a1bc6>] __lock_task_sighand+0xb6/0x2c0 but this lock took another, HARDIRQ-unsafe lock in the past: (ucounts_lock){+.+...} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Chain exists of: &(&sighand->siglock)->rlock --> &(&tty->ctrl_lock)->rlock --> ucounts_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(ucounts_lock); local_irq_disable(); lock(&(&sighand->siglock)->rlock); lock(&(&tty->ctrl_lock)->rlock); <Interrupt> lock(&(&sighand->siglock)->rlock); *** DEADLOCK *** This patch removes a dependency between rlock and ucount_lock. Fixes: f333c700c610 ("pidns: Add a limit on the number of pid namespaces") Cc: stable@vger.kernel.org Signed-off-by: Andrei Vagin <avagin@openvz.org> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'sound/oss')