James Morse 6afedcd23c arm64: mm: Add trace_irqflags annotations to do_debug_exception() ... With CONFIG_PROVE_LOCKING, CONFIG_DEBUG_LOCKDEP and CONFIG_TRACE_IRQFLAGS enabled, lockdep will compare current->hardirqs_enabled with the flags from local_irq_save(). When a debug exception occurs, interrupts are disabled in entry.S, but lockdep isn't told, resulting in: DEBUG_LOCKS_WARN_ON(current->hardirqs_enabled) ------------[ cut here ]------------ WARNING: at ../kernel/locking/lockdep.c:3523 Modules linked in: CPU: 3 PID: 1752 Comm: perf Not tainted 4.5.0-rc4+ #2204 Hardware name: ARM Juno development board (r1) (DT) task: ffffffc974868000 ti: ffffffc975f40000 task.ti: ffffffc975f40000 PC is at check_flags.part.35+0x17c/0x184 LR is at check_flags.part.35+0x17c/0x184 pc : [<ffffff80080fc93c>] lr : [<ffffff80080fc93c>] pstate: 600003c5 [...] ---[ end trace 74631f9305ef5020 ]--- Call trace: [<ffffff80080fc93c>] check_flags.part.35+0x17c/0x184 [<ffffff80080ffe30>] lock_acquire+0xa8/0xc4 [<ffffff8008093038>] breakpoint_handler+0x118/0x288 [<ffffff8008082434>] do_debug_exception+0x3c/0xa8 [<ffffff80080854b4>] el1_dbg+0x18/0x6c [<ffffff80081e82f4>] do_filp_open+0x64/0xdc [<ffffff80081d6e60>] do_sys_open+0x140/0x204 [<ffffff80081d6f58>] SyS_openat+0x10/0x18 [<ffffff8008085d30>] el0_svc_naked+0x24/0x28 possible reason: unannotated irqs-off. irq event stamp: 65857 hardirqs last enabled at (65857): [<ffffff80081fb1c0>] lookup_mnt+0xf4/0x1b4 hardirqs last disabled at (65856): [<ffffff80081fb188>] lookup_mnt+0xbc/0x1b4 softirqs last enabled at (65790): [<ffffff80080bdca4>] __do_softirq+0x1f8/0x290 softirqs last disabled at (65757): [<ffffff80080be038>] irq_exit+0x9c/0xd0 This patch adds the annotations to do_debug_exception(), while trying not to call trace_hardirqs_off() if el1_dbg() interrupted a task that already had irqs disabled. Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>		2016-04-14 18:40:33 +01:00
..
cache.S	arm64: Use PoU cache instr for I/D coherency	2015-12-17 11:07:13 +00:00
context.c	arm64: make mrs_s prefixing implicit in read_cpuid	2016-03-04 14:12:46 +00:00
copypage.c	arm64: Defer dcache flush in __cpu_copy_user_page	2015-12-17 11:07:13 +00:00
dma-mapping.c	arm64: dma-mapping: fix handling of devices registered before arch_initcall	2016-02-17 11:48:01 +00:00
dump.c	arm64: mm: move vmemmap region right below the linear region	2016-04-14 16:31:49 +01:00
extable.c	arm64: switch to relative exception tables	2016-02-24 14:57:26 +00:00
fault.c	arm64: mm: Add trace_irqflags annotations to do_debug_exception()	2016-04-14 18:40:33 +01:00
flush.c	arm64: mm: allow preemption in copy_to_user_page	2016-03-24 16:32:54 +00:00
hugetlbpage.c	mm: cleanup *pte_alloc* interfaces	2016-03-17 15:09:34 -07:00
init.c	arm64: mm: move vmemmap region right below the linear region	2016-04-14 16:31:49 +01:00
ioremap.c	arm64: add ioremap physical address information	2015-01-23 15:29:06 +00:00
kasan_init.c	arm64: kasan: Fix zero shadow mapping overriding kernel image shadow	2016-03-11 11:03:35 +00:00
Makefile	arm64: add KASAN support	2015-10-12 17:46:36 +01:00
mm.h	arm64: add better page protections to arm64	2015-01-22 14:54:29 +00:00
mmap.c	mm: ASLR: use get_random_long()	2016-02-27 10:28:52 -08:00
mmu.c	arm64: cover the .head.text section in the .text segment mapping	2016-04-14 18:11:43 +01:00
pageattr.c	arm64: Add support for ARCH_SUPPORTS_DEBUG_PAGEALLOC	2016-02-16 15:40:30 +00:00
pgd.c	arm64: mm: move pgd_cache initialisation to pgtable_cache_init	2016-01-05 15:43:10 +00:00
proc-macros.S	arm64: kernel: fix architected PMU registers unconditional access	2016-01-25 11:09:06 +00:00
proc.S	arm64: Add workaround for Cavium erratum 27456	2016-02-26 15:14:27 +00:00