Re: [ PATCH stable v4.19] EDAC: Drop per-memory controller buses

[Manali Shukla (manashuk)]

> On 05/04/20, 11:36 PM, "Borislav Petkov" <bp@xxxxxxx> wrote:

>    On Sun, Apr 05, 2020 at 06:01:21PM +0000, Manali Shukla (manashuk) wrote:
>> With this patch , we are removing per-MC bus, this removes dependency on value of max number of controllers (EDAC_MAX_MCS) which is hardcoded to 2 * MAX_NUMNODES  in all stable versions of kernel. 
 >> On two nodes system MAX_NUMNODES value is â1â , so value of max number of memory controller becomes â2â, this patch fixes this issue when there are only 2 nodes on the system and number of memory controllers are more than â2'
    
 > You basically repeated what you had written already.
    
 >  But what is this fixing? Some platform of yours or what? Why does it
 > need to go to stable?
    
Certain MIPS platform can have 2 nodes and number of memory controllers can be more than '2' .

for above condition, if
#define EDAC_MAX_MCS 2 * MAX_NUMNODES,
it fails in this function edac_mc_add_mc_with_groups
in below condition
if (mci->mc_idx >= EDAC_MAX_MCS) {
pr_warn_once("Too many memory controllers: %d\n", mci->mc_idx);
return -ENODEV;
}
That is why this fix is needed.

 >  Btw, please do not top-post and reply under the quoted text like all of
 > us do.
    
 > Thx.
    
    -- 
 >  Regards/Gruss,
 >   Boris.
    
 >  SUSE Software Solutions Germany GmbH, GF: Felix ImendÃrffer, HRB 36809, AG NÃrnberg

Thanks 
Manali