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SubjectRe: [PATCH 1/2]pstore: Move timestamp collection code to common pstore place
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Hi Kees,

Thank you so much for your response.



On Tuesday 23 May 2017 05:07 AM, Kees Cook wrote:
> On Mon, May 22, 2017 at 3:20 AM, Ankit Kumar <ankit@linux.vnet.ibm.com> wrote:
>> Current pstore code(ram.c) gets dump timestamp and make it part of header.
>> Different diffent architecture uses different header format and hence it
>> won't be good idea to make ramoops_write_kmsg_hdr/ramoops_read_kmsg_hdr
>> part of generic pstore code.
>>
>> ramoops_write_kmsg_hdr calls __getnstimeofday to get timestamp and also
>> takes care of condition if timekeeping has not resumed.
>>
>> This patch moves code for retrieving timestamp to common place and hence
>> can be used by other functions as well.
> Ah! Heh, funny, I had just done a version of this while working on EFI
> pstore fixes. Here's what I did instead:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?h=pstore/fixes&id=ea209b760f104daf0cf62953090b66c5628b0842
>
> This makes it so the time field is prepopulated for all backend
> writes, which should simplify things (no need to have the backends
> call out).


Above mentioned patch moves code to common place and also simplifies things.
I agree, My patch is not required anymore.

Thank you;

~Ankit




> -Kees
>
>> Signed-off-by: Ankit Kumar <ankit@linux.vnet.ibm.com>
>> ---
>> fs/pstore/internal.h | 1 +
>> fs/pstore/platform.c | 13 +++++++++++++
>> fs/pstore/ram.c | 9 ++++-----
>> 3 files changed, 18 insertions(+), 5 deletions(-)
>>
>> diff --git a/fs/pstore/internal.h b/fs/pstore/internal.h
>> index c416e65..339dcdc 100644
>> --- a/fs/pstore/internal.h
>> +++ b/fs/pstore/internal.h
>> @@ -22,6 +22,7 @@ static inline void pstore_unregister_pmsg(void) {}
>> #endif
>>
>> extern struct pstore_info *psinfo;
>> +void pstore_get_timestamp(struct timespec *timestamp);
>>
>> extern void pstore_set_kmsg_bytes(int);
>> extern void pstore_get_records(int);
>> diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
>> index d468eec..5cb25b0 100644
>> --- a/fs/pstore/platform.c
>> +++ b/fs/pstore/platform.c
>> @@ -474,6 +474,19 @@ static size_t copy_kmsg_to_buffer(int hsize, size_t len)
>> return total_len;
>> }
>>
>> +void pstore_get_timestamp(struct timespec *timestamp)
>> +{
>> + if (!timestamp)
>> + return;
>> +
>> + /* Report zeroed timestamp if called before timekeeping has resumed. */
>> + if (__getnstimeofday(timestamp)) {
>> + timestamp->tv_sec = 0;
>> + timestamp->tv_nsec = 0;
>> + }
>> +}
>> +EXPORT_SYMBOL_GPL(pstore_get_timestamp);
>> +
>> /*
>> * callback from kmsg_dump. (s2,l2) has the most recently
>> * written bytes, older bytes are in (s1,l1). Save as much
>> diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
>> index 5cb022c..e39297d 100644
>> --- a/fs/pstore/ram.c
>> +++ b/fs/pstore/ram.c
>> @@ -37,6 +37,8 @@
>> #include <linux/of.h>
>> #include <linux/of_address.h>
>>
>> +#include "internal.h"
>> +
>> #define RAMOOPS_KERNMSG_HDR "===="
>> #define MIN_MEM_SIZE 4096UL
>>
>> @@ -362,11 +364,8 @@ static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
>> struct timespec timestamp;
>> size_t len;
>>
>> - /* Report zeroed timestamp if called before timekeeping has resumed. */
>> - if (__getnstimeofday(&timestamp)) {
>> - timestamp.tv_sec = 0;
>> - timestamp.tv_nsec = 0;
>> - }
>> + pstore_get_timestamp(&timestamp);
>> +
>> hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
>> (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000),
>> compressed ? 'C' : 'D');
>> --
>> 2.7.4
>>
>
>

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