riscv: declare overflow_stack as exported from traps.c

The percpu area overflow_stacks is exported from arch/riscv/kernel/traps.c
for use in the entry code, but is not declared anywhere. Add the rel

riscv: declare overflow_stack as exported from traps.c

The percpu area overflow_stacks is exported from arch/riscv/kernel/traps.c
for use in the entry code, but is not declared anywhere. Add the relevant
declaration to arch/riscv/include/asm/stacktrace.h to silence the following
sparse warning:

arch/riscv/kernel/traps.c:395:1: warning: symbol '__pcpu_scope_overflow_stack' was not declared. Should it be static?

We don't add the stackinfo_get_overflow() call as for some of the other
architectures as this doesn't seem to be used yet, so just silence the
warning.

Signed-off-by: Ben Dooks <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Fixes: be97d0db5f44 ("riscv: VMAP_STACK overflow detection thread-safe")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

show more ...

riscv: entry: Convert to generic entry

This patch converts riscv to use the generic entry infrastructure from
kernel/entry/*. The generic entry makes maintainers' work easier and
codes more elegant.

riscv: entry: Convert to generic entry

This patch converts riscv to use the generic entry infrastructure from
kernel/entry/*. The generic entry makes maintainers' work easier and
codes more elegant. Here are the changes:

- More clear entry.S with handle_exception and ret_from_exception
- Get rid of complex custom signal implementation
- Move syscall procedure from assembly to C, which is much more
readable.
- Connect ret_from_fork & ret_from_kernel_thread to generic entry.
- Wrap with irqentry_enter/exit and syscall_enter/exit_from_user_mode
- Use the standard preemption code instead of custom

Suggested-by: Huacai Chen <[email protected]>
Reviewed-by: Björn Töpel <[email protected]>
Tested-by: Yipeng Zou <[email protected]>
Tested-by: Jisheng Zhang <[email protected]>
Signed-off-by: Guo Ren <[email protected]>
Signed-off-by: Guo Ren <[email protected]>
Cc: Ben Hutchings <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

show more ...

riscv: Add dump stack in show_regs

Like commit 1149aad10b1e ("arm64: Add dump_backtrace() in show_regs"),
dump the stack in riscv show_regs as common code expects.

Reviewed-by: Atish Patra <atish.p

riscv: Add dump stack in show_regs

Like commit 1149aad10b1e ("arm64: Add dump_backtrace() in show_regs"),
dump the stack in riscv show_regs as common code expects.

Reviewed-by: Atish Patra <[email protected]>
Signed-off-by: Kefeng Wang <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>

show more ...

riscv: Make stack walk callback consistent with generic code

In order to use generic arch_stack_walk() code, make stack walk
callback consistent with it.

Signed-off-by: Kefeng Wang <wangkefeng.wang

riscv: Make stack walk callback consistent with generic code

In order to use generic arch_stack_walk() code, make stack walk
callback consistent with it.

Signed-off-by: Kefeng Wang <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>

show more ...

riscv: Cleanup stacktrace

1. add asm/stacktrace.h for walk_stackframe and struct stackframe
2. remove unnecessary blank lines in stacktrace.c
3. fix warning "no previous prototype for ‘fill_callchai

riscv: Cleanup stacktrace

1. add asm/stacktrace.h for walk_stackframe and struct stackframe
2. remove unnecessary blank lines in stacktrace.c
3. fix warning "no previous prototype for ‘fill_callchain’"

Signed-off-by: Kefeng Wang <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>

show more ...