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Content-Language: en-US To: Imran Khan , geert@linux-m68k.org, akpm@linux-foundation.org, ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@linux.ie, daniel@ffwll.ch Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-mm@kvack.org References: <20210910141001.1622130-1-imran.f.khan@oracle.com> <20210910141001.1622130-2-imran.f.khan@oracle.com> From: Vlastimil Babka In-Reply-To: <20210910141001.1622130-2-imran.f.khan@oracle.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=mWaZYv8s; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=L4mz27K6; spf=pass (imf09.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 5E00E3000103 X-Stat-Signature: 1r9twq3ezp85ynedr5zw1n1s95wcibyw X-HE-Tag: 1631523074-549738 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 9/10/21 16:10, Imran Khan wrote: > To print stack entries into a buffer, users of stackdepot, > first get a list of stack entries using stack_depot_fetch > and then print this list into a buffer using stack_trace_snprint. > Provide a helper in stackdepot for this purpose. > Also change above mentioned users to use this helper. > > Signed-off-by: Imran Khan > Suggested-by: Vlastimil Babka Acked-by: Vlastimil Babka A comment below: > --- a/lib/stackdepot.c > +++ b/lib/stackdepot.c > @@ -214,6 +214,29 @@ static inline struct stack_record *find_stack(struct stack_record *bucket, > return NULL; > } > > +/** > + * stack_depot_snprint - print stack entries from a depot into a buffer > + * > + * @handle: Stack depot handle which was returned from > + * stack_depot_save(). > + * @buf: Pointer to the print buffer > + * > + * @size: Size of the print buffer > + * > + * @spaces: Number of leading spaces to print > + * > + * Return: Number of bytes printed. > + */ > +int stack_depot_snprint(depot_stack_handle_t handle, char *buf, size_t size, > + int spaces) > +{ > + unsigned long *entries; > + unsigned int nr_entries; > + > + nr_entries = stack_depot_fetch(handle, &entries); > + return stack_trace_snprint(buf, size, entries, nr_entries, 0); stack_trace_snprint() has a WARN_ON(!entries). So maybe we should not call it if nr_entries is 0 (because e.g. handle was 0) as the warnings are not useful in that case.