linux-kernel - Re: [PATCH v4 1/3] stacktrace: Remove weak version of save_stack_trace_tsk

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Message-Id: <20190612134115.GA8298@JAVRIS.in.ibm.com>
Date:   Wed, 12 Jun 2019 19:11:15 +0530
From:   Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:     Miroslav Benes <mbenes@...e.cz>
Cc:     jpoimboe@...hat.com, jikos@...nel.org, pmladek@...e.com,
        joe.lawrence@...hat.com, live-patching@...r.kernel.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v4 1/3] stacktrace: Remove weak version of
 save_stack_trace_tsk_reliable()

On Tue, Jun 11, 2019 at 04:13:18PM +0200, Miroslav Benes wrote:
> Recent rework of stack trace infrastructure introduced a new set of
> helpers for common stack trace operations (commit e9b98e162aa5
> ("stacktrace: Provide helpers for common stack trace operations") and
> related). As a result, save_stack_trace_tsk_reliable() is not directly
> called anywhere. Livepatch, currently the only user of the reliable
> stack trace feature, now calls stack_trace_save_tsk_reliable().
> 
> When CONFIG_HAVE_RELIABLE_STACKTRACE is set and depending on
> CONFIG_ARCH_STACKWALK, stack_trace_save_tsk_reliable() calls either
> arch_stack_walk_reliable() or mentioned save_stack_trace_tsk_reliable().
> x86_64 defines the former, ppc64le the latter. All other architectures
> do not have HAVE_RELIABLE_STACKTRACE and include/linux/stacktrace.h
> defines -ENOSYS returning version for them.
> 
> In short, stack_trace_save_tsk_reliable() returning -ENOSYS defined in
> include/linux/stacktrace.h serves the same purpose as the old weak
> version of save_stack_trace_tsk_reliable() which is therefore no longer
> needed.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Miroslav Benes <mbenes@...e.cz>

Reviewed-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>