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RISC-V: Enable IRQ during exception handling 

Interrupt is allowed during exception handling.
There are warning messages if the kernel enables the configuration
'CONFIG_DEBUG_ATOMIC_SLEEP=y'.

BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:23
in_atomic(): 0, irqs_disabled(): 1, pid: 43, name: ash
CPU: 0 PID: 43 Comm: ash Tainted:  G	 W	 4.15.0-rc8-00089-g89ffdae-dirty #17
Call Trace:
[<000000009abb1587>] walk_stackframe+0x0/0x7a
[<00000000d4f3d088>] ___might_sleep+0x102/0x11a
[<00000000b1fd792a>] down_read+0x18/0x28
[<000000000289ec01>] do_page_fault+0x86/0x2f6
[<00000000012441f6>] _do_fork+0x1b4/0x1e0
[<00000000f46c3e3b>] ret_from_syscall+0xa/0xe

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Zong Li <zong@andestech.com>
Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
hifive-unleashed-5.1
zongbox@gmail.com 2018-01-29 23:51:45 -08:00 committed by Palmer Dabbelt
parent a503360989
commit bcae803a21
No known key found for this signature in database
GPG Key ID: EF4CA1502CCBAB41
1 changed files with 3 additions and 2 deletions
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5
arch/riscv/kernel/entry.S
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@ -172,6 +172,9 @@ ENTRY(handle_exception)
move a1, sp /* pt_regs */
tail do_IRQ
1:
/* Exceptions run with interrupts enabled */
csrs sstatus, SR_SIE
/* Handle syscalls */
li t0, EXC_SYSCALL
beq s4, t0, handle_syscall
@ -198,8 +201,6 @@ handle_syscall:
*/
addi s2, s2, 0x4
REG_S s2, PT_SEPC(sp)
/* System calls run with interrupts enabled */
csrs sstatus, SR_SIE
/* Trace syscalls, but only if requested by the user. */
REG_L t0, TASK_TI_FLAGS(tp)
andi t0, t0, _TIF_SYSCALL_TRACE