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stacktrace: Move documentation for arch_stack_walk_reliable() to header 

Currently arch_stack_walk_reliable() is documented with an identical
comment in both x86 and S/390 implementations which is a bit redundant.
Move this to the header and convert to kerneldoc while we're at it.

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lkml.kernel.org/r/20210309194125.652-1-broonie@kernel.org
This commit is contained in:
Mark Brown 2021-03-09 19:41:25 +00:00 committed by Borislav Petkov
parent 09141ec0e4
commit b18adee4ce
3 changed files with 19 additions and 12 deletions
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6
arch/s390/kernel/stacktrace.c
View File

@ -24,12 +24,6 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
}
}
/*
* This function returns an error if it detects any unreliable features of the
* stack. Otherwise it guarantees that the stack trace is reliable.
*
* If the task is not 'current', the caller *must* ensure the task is inactive.
*/
int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
void *cookie, struct task_struct *task)
{

6
arch/x86/kernel/stacktrace.c
View File

@ -29,12 +29,6 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
}
}
/*
* This function returns an error if it detects any unreliable features of the
* stack. Otherwise it guarantees that the stack trace is reliable.
*
* If the task is not 'current', the caller *must* ensure the task is inactive.
*/
int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
void *cookie, struct task_struct *task)
{

19
include/linux/stacktrace.h
View File

@ -52,8 +52,27 @@ typedef bool (*stack_trace_consume_fn)(void *cookie, unsigned long addr);
*/
void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
struct task_struct *task, struct pt_regs *regs);
/**
* arch_stack_walk_reliable - Architecture specific function to walk the
* stack reliably
*
* @consume_entry: Callback which is invoked by the architecture code for
* each entry.
* @cookie: Caller supplied pointer which is handed back to
* @consume_entry
* @task: Pointer to a task struct, can be NULL
*
* This function returns an error if it detects any unreliable
* features of the stack. Otherwise it guarantees that the stack
* trace is reliable.
*
* If the task is not 'current', the caller *must* ensure the task is
* inactive and its stack is pinned.
*/
int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie,
struct task_struct *task);
void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie,
const struct pt_regs *regs);