Re: [BUG] Revert 0b05e2d671c4 'powerpc/32: cacheable_memcpy becomes memcpy'
From: Thomas Gleixner <hidden>
Date: 2015-09-16 20:01:45
On Wed, 16 Sep 2015, Scott Wood wrote:
On Wed, 2015-09-16 at 18:23 +0200, Thomas Gleixner wrote:quoted
With this commit applied, my MPC5200 board fails to boot 4.3-rc1. The boot failure is silent. Bisection pointed straight to this commit. Reverting it on top of 4.3-rc1 works like a charm.Yes, we've been iterating on a fix for this, and I think the patches posted earlier today are ready to go in: http://patchwork.ozlabs.org/patch/518321/ http://patchwork.ozlabs.org/patch/518323/
Tested-by: Thomas Gleixner <redacted> So now I have to chase down that one: [ 0.230210] ftrace: allocating 16560 entries in 49 pages [ 0.273313] ------------[ cut here ]------------ [ 0.278048] WARNING: at /home/tglx/work/kernel/tip/tip/kernel/trace/ftrace.c:1974 [ 0.285653] Modules linked in: [ 0.288781] CPU: 0 PID: 0 Comm: swapper Not tainted 4.2.0-50528-gfac33bf-dirty #29 [ 0.296485] task: c06563e0 ti: c06a2000 task.ti: c06a2000 [ 0.301976] NIP: c008df9c LR: c008e440 CTR: 00000000 [ 0.307027] REGS: c06a3e80 TRAP: 0700 Not tainted (4.2.0-50528-gfac33bf-dirty) [ 0.314631] MSR: 00021032 <ME,IR,DR,RI> CR: 22028022 XER: 00000000 [ 0.321126] GPR00: 00000001 c06a3f30 c06563e0 ffffffea c3888c88 00000004 c06a3ef8 764d9364 GPR08: 00407584 c069df92 00000000 00000001 22022028 ffffffff 03fb9000 007fff00 GPR16: c065debc 00009032 c06b8aa0 c0011184 00000000 c06a711c 00000bb6 c38021a0 GPR24: 00000000 00008c88 00000bb6 c06a7120 c3888c88 101d6120 c3888c88 c00e1f2c [ 0.351444] NIP [c008df9c] ftrace_bug+0xbc/0x2d4 [ 0.356160] LR [c008e440] ftrace_process_locs+0x28c/0x6cc [ 0.361652] Call Trace: [ 0.364169] [c06a3f30] [c00971a0] buffer_ftrace_now.isra.50+0x28/0x64 (unreliable) [ 0.371888] [c06a3f60] [c008e440] ftrace_process_locs+0x28c/0x6cc [ 0.378119] [c06a3fb0] [c0610848] ftrace_init+0xac/0x14c [ 0.383559] [c06a3fc0] [c06051fc] start_kernel+0x390/0x3a8 [ 0.389147] [c06a3ff0] [00003438] 0x3438 [ 0.393136] Instruction dump: [ 0.396154] 483f9951 3c60c059 7fe4fb78 3863b768 7fe5fb78 483f993d 41b20214 48000144 [ 0.404060] 3d20c06a 3929df92 88090002 68000001 <0f000000> 2f800000 409e01b4 3d20c06a [ 0.412203] ---[ end trace dc8fa200cb88537f ]--- [ 0.416912] ftrace failed to modify [<c00e1f2c>] change_protection+0x8/0x2c [ 0.424015] actual: 74:66:74:70 [ 0.427324] ftrace record flags: 0 [ 0.430785] (0) expected tramp: c0011198 Happens somewhere between the powerpc merge and rc1. System boots up to userspace and then locks hard .... Thanks, tglx