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Message-ID: <1591450.lUZUanAOs6@vostro.rjw.lan>
Date: Tue, 25 Nov 2014 22:20:39 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Hanjun Guo <guohanjun@...wei.com>
Cc: Hanjun Guo <hanjun.guo@...aro.org>,
Catalin Marinas <catalin.marinas@....com>,
Mark Rutland <mark.rutland@....com>,
Olof Johansson <olof@...om.net>,
Grant Likely <grant.likely@...aro.org>,
Will Deacon <will.deacon@....com>,
Graeme Gregory <graeme.gregory@...aro.org>,
Arnd Bergmann <arnd@...db.de>,
Sudeep Holla <Sudeep.Holla@....com>,
Jon Masters <jcm@...hat.com>,
Jason Cooper <jason@...edaemon.net>,
Marc Zyngier <marc.zyngier@....com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
Robert Richter <rric@...nel.org>,
Lv Zheng <lv.zheng@...el.com>,
Robert Moore <robert.moore@...el.com>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
Liviu Dudau <Liviu.Dudau@....com>,
Randy Dunlap <rdunlap@...radead.org>,
Charles.Garcia-Tobin@....com, Kangkang.Shen@...wei.com,
linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
Ashwin Chaugule <ashwin.chaugule@...aro.org>,
Tomasz Nowicki <tomasz.nowicki@...aro.org>
Subject: Re: [PATCH v5 02/18] ACPI / table: Add new function to get table entries
On Tuesday, November 25, 2014 11:38:05 AM Hanjun Guo wrote:
> On 2014/11/24 22:51, Rafael J. Wysocki wrote:
> > On Monday, November 24, 2014 07:03:54 PM Hanjun Guo wrote:
> >> On 2014-11-24 9:27, Rafael J. Wysocki wrote:
> >>> On Friday, October 17, 2014 09:36:58 PM Hanjun Guo wrote:
> >>>> From: Ashwin Chaugule <ashwin.chaugule@...aro.org>
> >>>>
> >>>> The acpi_table_parse() function has a callback that
> >>>> passes a pointer to a table_header. Add a new function
> >>>> which takes this pointer and parses its entries. This
> >>>> eliminates the need to re-traverse all the tables for
> >>>> each call. e.g. as in acpi_table_parse_madt() which is
> >>>> normally called after acpi_table_parse().
> >>>>
> >>>> Acked-by: Grant Likely <grant.likely@...aro.org>
> >>>> Signed-off-by: Ashwin Chaugule <ashwin.chaugule@...aro.org>
> >>>> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
> >>>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> >>>> ---
> >>>> drivers/acpi/tables.c | 67 ++++++++++++++++++++++++++++++++++---------------
> >>>> include/linux/acpi.h | 4 +++
> >>>> 2 files changed, 51 insertions(+), 20 deletions(-)
> >>>>
> >>>> diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
> >>>> index 6d5a6cd..21ae521 100644
> >>>> --- a/drivers/acpi/tables.c
> >>>> +++ b/drivers/acpi/tables.c
> >>>> @@ -192,17 +192,14 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
> >>>>
> >>>>
> >>>> int __init
> >>>> -acpi_table_parse_entries(char *id,
> >>>> - unsigned long table_size,
> >>>> - int entry_id,
> >>>> - acpi_tbl_entry_handler handler,
> >>>> - unsigned int max_entries)
> >>>> +acpi_parse_entries(unsigned long table_size,
> >>>> + acpi_tbl_entry_handler handler,
> >>>> + struct acpi_table_header *table_header,
> >>>> + int entry_id, unsigned int max_entries)
> >>>> {
> >>>> - struct acpi_table_header *table_header = NULL;
> >>>> struct acpi_subtable_header *entry;
> >>>> - unsigned int count = 0;
> >>>> + int count = 0;
> >>>> unsigned long table_end;
> >>>> - acpi_size tbl_size;
> >>>>
> >>>> if (acpi_disabled)
> >>>> return -ENODEV;
> >>>> @@ -210,13 +207,11 @@ acpi_table_parse_entries(char *id,
> >>>> if (!handler)
> >>>> return -EINVAL;
> >>>>
> >>>> - if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
> >>>> - acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size);
> >>>> - else
> >>>> - acpi_get_table_with_size(id, 0, &table_header, &tbl_size);
> >>>> + if (!table_size)
> >>>> + return -EINVAL;
> >>>>
> >>>> if (!table_header) {
> >>>> - pr_warn("%4.4s not present\n", id);
> >>>> + pr_warn("Table header not present\n");
> >>> The message doesn't make sense any more if the table signature is not printed.
>
> For this message, since no table id is passed, and this message is printed in
> acpi_table_parse_entries() before this function is called, I think we can check
> the table_header before call this function and remove the printed message here.
table_header needs to be checked against NULL in the caller and the message
printed from there to my eyes.
> >>>
> >>>> return -ENODEV;
> >>>> }
> >>>>
> >>>> @@ -232,30 +227,62 @@ acpi_table_parse_entries(char *id,
> >>>> if (entry->type == entry_id
> >>>> && (!max_entries || count++ < max_entries))
> >>>> if (handler(entry, table_end))
> >>>> - goto err;
> >>>> + return -EINVAL;
> >>>>
> >>>> /*
> >>>> * If entry->length is 0, break from this loop to avoid
> >>>> * infinite loop.
> >>>> */
> >>>> if (entry->length == 0) {
> >>>> - pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id);
> >>>> - goto err;
> >>>> + pr_err("[0x%02x] Invalid zero length\n", entry_id);
>
> For this one, since the table_header is valid now, we can keep it with:
Fine by me.
> - pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id);
> + pr_err("[%4.4s:0x%02x] Invalid zero length\n", table_header->signature, entry_id);
>
> >>> Same here.
> >> How about remove the message and return directly?
> > We could do that, but for what reason? Is the message not useful?
>
> I agree with you, the message is useful I think, how about the comments above?
Please see above.
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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