Hi Paul, On 05/10/17 17:07, Paul Burton wrote: >> On Fri, 9 Jun 2017 17:26:38 -0700, Paul Burton wrote: >>> Replace the macro definition of __cmpxchg() with an inline function, >>> which is easier to read & modify. The cmpxchg() & cmpxchg_local() >>> macros are adjusted to call the new __cmpxchg() function. >>> >>> Signed-off-by: Paul Burton <paul.burton@xxxxxxxxxx> >>> Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx> >>> Cc: linux-mips@xxxxxxxxxxxxxx >> >> I think this patch is breaking user space for me. I say "think" >> because it is a bit tricky to bisect for the few patches previous to this one >> since they won't compile cleanly for me (due to this >> https://www.spinics.net/lists/mips/msg68727.html). >> >> I have a Cavium Octeon 5010 MIPS64 CPU on a custom board, have been >> running it for years running various kernel versions. Linux-4.13 breaks for me, >> and I bisected back to this change. >> >> What I see is user space bomb strait after boot with console messages like >> this: >> >> mount[37] killed because of sig - 11 >> >> STACK DUMP: >> <snip> >> >> I get a lot of them from various programs running from rc scripts. >> It never manages to fully boot to login/shell. >> >> If I take the linux-4.12 arch/mips/include/asm/cmpxchg.h and drop that in >> place on a linux-4.13 (or even linux-4.14-rc3) I can compile and run everything >> successfully. >> >> Any thoughts? > > Are you running a uniprocessor/non-SMP kernel? Yes, CONFIG_SMP not set. > Could you try this fix I submitted this fix 5 weeks ago: > > https://patchwork.linux-mips.org/patch/17226/ Yep, that fixes it. Thanks for the quick response. > Ralf: Could we get that merged please? Since this is a problem in linux-4.13 then a candidate for linux-4.13 stable too? Regards Greg
