Messages in this thread | | | Date | Thu, 03 Nov 2011 15:20:14 -0200 | From | Mauro Carvalho Chehab <> | Subject | Re: sb_edac 32-bit compile fail due to 64-bit divide |
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Em 03-11-2011 12:43, Josh Boyer escreveu: > On Thu, Nov 03, 2011 at 12:32:31PM -0200, Mauro Carvalho Chehab wrote: >> Em 03-11-2011 12:07, Josh Boyer escreveu: >>> Hi, >>> >>> It seems the newly added EDAC driver for SandyBridge won't build on >>> 32-bit x86 because of a 64-bit divide somewhere: >>> >>> drivers/edac/sb_edac.c: In function 'get_memory_error_data': >>> drivers/edac/sb_edac.c:861:2: warning: left shift count >= width of type >>> [enabled by default] >>> <snip> >>> ERROR: "__udivdi3" [drivers/edac/sb_edac.ko] undefined! >>> make[1]: *** [__modpost] Error 1 >>> make: *** [modules] Error 2 >>> >>> You can find the full build log here: >>> >>> http://koji.fedoraproject.org/koji/getfile?taskID=3482579&name=build.log >>> >>> Before I go digging into where this is done and what to do about it, I >>> do want to confirm that it is supposed to work on a 32-bit kernel, >>> correct? >> >> Thanks for pointing it! >> >> Well, I didn't test it on a 32-bit kernel. It should work through. >> >> It is probably due to those debug lines: >> debugf0("CH#%d RIR#%d INTL#%d, offset %Lu.%03Lu GB (0x%016Lx), tgt: %d, reg=0x%08x\n", >> i, j, k, >> tmp_mb / 1000, tmp_mb % 1000, >> ((u64)tmp_mb) << 20L, >> (u32)RIR_RNK_TGT(reg), >> reg); >> (same kind of calculus is recurrent at the driver) > > All of that should basically not exist in this build because the debugf* > macros depend on CONFIG_EDAC_DEBUG, which isn't set in this build. The > problem seems to be somewhere else.
I strongly recommend you to enable EDAC_DEBUG if you're building this driver. This driver is experimental, and it may be blaming the wrong memory DIMMs, as Sandy Bridge bios allows setting a large myriad of configurations. Among them, only one were actually tested.
> > I would guess line 1056: > > addr /= sck_xch; > > addr is a u64.
Ok.
Well, a patch fixing it should be done with debug enabled, to get all cases.
>> Maybe the easiest way would be to write a function that would call do_div() internally, >> and output a string with something similar to: >> >> sprintf(msg, "%Lu.%03Lu GB", tmp_mb / 1000, tmp_mb % 1000); >> >> Of course, an interim fix would be to make it depend on CONFIG_64BIT or CONFIG_X86_64. > > That would work I guess. It's up to you.
I prefer a patch fixing the issue. Not sure if I'll have time to work in it today, as I'm stuck with the second part of media patches for 3.2.
>> >> Regards, >> Mauro > -- > To unsubscribe from this list: send the line "unsubscribe linux-edac" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
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