Re: [PATCH RFT] x86: move cacheinfo sysfs to generic cacheinfo infrastructure

From: Borislav Petkov
Date: Fri Jan 23 2015 - 13:15:51 EST

On Fri, Jan 23, 2015 at 02:55:03PM +0100, Thomas Gleixner wrote:
> Cc: Boris
>
> On Thu, 8 Jan 2015, Sudeep Holla wrote:
>
> > This patch removes the redundant sysfs cacheinfo code by reusing
> > the newly introduced generic cacheinfo infrastructure through the
> > commit 246246cbde5e ("drivers: base: support cpu cache information
> > interface to userspace via sysfs")
> >
> > The private pointer provided by the cacheinfo is used to implement
> > the AMD L3 cache specific attributes.
> >
> > Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
> > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> > Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> > Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> > Cc: x86@xxxxxxxxxx

...
[ 2.878173] ACPI: processor limited to max C-state 1
[ 2.884048] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[ 2.911085] 00:01: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[ 2.920699] Linux agpgart interface v0.103
[ 2.924908] [drm] Initialized drm 1.1.0 20060810
[ 2.929719] ------------[ cut here ]------------
[ 2.934419] WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:2744 lockdep_trace_alloc+0xd4/0xe0()
[ 2.943591] DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags))
[ 2.949024] Modules linked in:
[ 2.952486] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.19.0-rc5+ #1
[ 2.958921] Hardware name: MICRO-STAR INTERNATIONAL CO.,LTD MS-7599/870-C45 (MS-7599), BIOS V1.15 03/04/2011
[ 2.968878] ffffffff817e9f1f ffff880132183b08 ffffffff81567210 0000000000000000
[ 2.976603] ffff880132183b58 ffff880132183b48 ffffffff8107bbe5 ffff880132183b98
[ 2.984333] 0000000000000096 00000000000080d0 0000000000000018 ffff880132001cc0
[ 2.992063] Call Trace:
[ 2.994594] [<ffffffff81567210>] dump_stack+0x4f/0x7b
[ 2.999818] [<ffffffff8107bbe5>] warn_slowpath_common+0x95/0xe0
[ 3.005909] [<ffffffff8107bc76>] warn_slowpath_fmt+0x46/0x50
[ 3.011740] [<ffffffff810c5834>] lockdep_trace_alloc+0xd4/0xe0
[ 3.017745] [<ffffffff811ac3b1>] __kmalloc+0x51/0x230
[ 3.022969] [<ffffffff8101389d>] ? cpuid4_cache_lookup_regs+0x21d/0x480
[ 3.029753] [<ffffffff8101389d>] cpuid4_cache_lookup_regs+0x21d/0x480
[ 3.036365] [<ffffffff81013b00>] ? cpuid4_cache_lookup_regs+0x480/0x480
[ 3.043149] [<ffffffff81013b94>] _populate_cache_leaves+0x94/0x460
[ 3.049498] [<ffffffff81013b00>] ? cpuid4_cache_lookup_regs+0x480/0x480
[ 3.056282] [<ffffffff810fcec6>] generic_exec_single+0x136/0x1a0
[ 3.062456] [<ffffffff81013b00>] ? cpuid4_cache_lookup_regs+0x480/0x480
[ 3.069237] [<ffffffff810fcf93>] smp_call_function_single+0x63/0xd0
[ 3.075674] [<ffffffff811ac4e8>] ? __kmalloc+0x188/0x230
[ 3.081155] [<ffffffff81014862>] populate_cache_leaves+0x22/0x30
[ 3.087329] [<ffffffff813c342b>] detect_cache_attributes+0x7b/0x1a0
[ 3.093767] [<ffffffff81b1ed9b>] ? container_dev_init+0x2f/0x2f
[ 3.099855] [<ffffffff81b1eddd>] cacheinfo_sysfs_init+0x42/0x93
[ 3.105946] [<ffffffff81b1ed9b>] ? container_dev_init+0x2f/0x2f
[ 3.112038] [<ffffffff810002f0>] do_one_initcall+0xa0/0x1f0
[ 3.117777] [<ffffffff8109b000>] ? parse_args+0x1b0/0x420
[ 3.123345] [<ffffffff81aee001>] kernel_init_freeable+0x115/0x19d
[ 3.129605] [<ffffffff8157047f>] ? ret_from_fork+0xf/0xb0
[ 3.135172] [<ffffffff815628b0>] ? rest_init+0xd0/0xd0
[ 3.140478] [<ffffffff815628be>] kernel_init+0xe/0xf0
[ 3.145699] [<ffffffff815704ec>] ret_from_fork+0x7c/0xb0
[ 3.151177] [<ffffffff815628b0>] ? rest_init+0xd0/0xd0
[ 3.156489] ---[ end trace 5a99fef82328e919 ]---
[ 3.161190] BUG: unable to handle kernel NULL pointer dereference at 00000000000000f8
[ 3.169248] IP: [<ffffffff81013f40>] _populate_cache_leaves+0x440/0x460
[ 3.175993] PGD 0
[ 3.178141] Oops: 0002 [#1] PREEMPT SMP
[ 3.182297] Modules linked in:
[ 3.185486] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 3.19.0-rc5+ #1
[ 3.193099] Hardware name: MICRO-STAR INTERNATIONAL CO.,LTD MS-7599/870-C45 (MS-7599), BIOS V1.15 03/04/2011
[ 3.203053] task: ffff880132138000 ti: ffff880132180000 task.ti: ffff880132180000
[ 3.210667] RIP: 0010:[<ffffffff81013f40>] [<ffffffff81013f40>] _populate_cache_leaves+0x440/0x460
[ 3.219892] RSP: 0000:ffff880132183c88 EFLAGS: 00010086
[ 3.225286] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000ffffffff
[ 3.232503] RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000000
[ 3.239719] RBP: ffff880132183d28 R08: ffff880136c0a0c0 R09: ffff88013196eb60
[ 3.246936] R10: 0000000000000002 R11: 0000000000000212 R12: 0000000000000000
[ 3.254152] R13: 000000000000a0c0 R14: ffffffff81acdad8 R15: 0000000000000001
[ 3.261369] FS: 0000000000000000(0000) GS:ffff880136c00000(0000) knlGS:0000000000000000
[ 3.269586] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 3.275414] CR2: 00000000000000f8 CR3: 0000000001a11000 CR4: 00000000000007f0
[ 3.282630] Stack:
[ 3.284724] ffff880132183de4 000000000000a000 000000000000a000 ffff880136c0fbc0
[ 3.292451] 0000000000000090 ffff88013197f4b0 0000000000000006 ffff88013197f520
[ 3.300175] 000000000000a0c0 0000000300000000 0bc0003f14000163 00000000000007ff
[ 3.307901] Call Trace:
[ 3.310433] [<ffffffff81013b00>] ? cpuid4_cache_lookup_regs+0x480/0x480
[ 3.317216] [<ffffffff810fcec6>] generic_exec_single+0x136/0x1a0
[ 3.323392] [<ffffffff81013b00>] ? cpuid4_cache_lookup_regs+0x480/0x480
[ 3.330176] [<ffffffff810fcf93>] smp_call_function_single+0x63/0xd0
[ 3.336612] [<ffffffff811ac4e8>] ? __kmalloc+0x188/0x230
[ 3.342093] [<ffffffff81014862>] populate_cache_leaves+0x22/0x30
[ 3.348269] [<ffffffff813c342b>] detect_cache_attributes+0x7b/0x1a0
[ 3.354706] [<ffffffff81b1ed9b>] ? container_dev_init+0x2f/0x2f
[ 3.360795] [<ffffffff81b1eddd>] cacheinfo_sysfs_init+0x42/0x93
[ 3.366886] [<ffffffff81b1ed9b>] ? container_dev_init+0x2f/0x2f
[ 3.372976] [<ffffffff810002f0>] do_one_initcall+0xa0/0x1f0
[ 3.378717] [<ffffffff8109b000>] ? parse_args+0x1b0/0x420
[ 3.384283] [<ffffffff81aee001>] kernel_init_freeable+0x115/0x19d
[ 3.390543] [<ffffffff8157047f>] ? ret_from_fork+0xf/0xb0
[ 3.396111] [<ffffffff815628b0>] ? rest_init+0xd0/0xd0
[ 3.401416] [<ffffffff815628be>] kernel_init+0xe/0xf0
[ 3.406638] [<ffffffff815704ec>] ret_from_fork+0x7c/0xb0
[ 3.412116] [<ffffffff815628b0>] ? rest_init+0xd0/0xd0
[ 3.417422] Code: 3c dd 80 d7 ac 81 ff c2 48 63 d2 be 06 00 00 00 e8 c6 87 2b 00 3b 05 e4 ac ab 00 89 c2 7d a4 89 c0 49 0f a3 06 19 c9 85 c9 74 d0 <f0> 49 0f ab 84 24 f8 00 00 00 eb c4 4c 8b 65 98 e9 eb fd ff ff
[ 3.439789] RIP [<ffffffff81013f40>] _populate_cache_leaves+0x440/0x460
[ 3.446622] RSP <ffff880132183c88>
[ 3.450191] CR2: 00000000000000f8
[ 3.453592] ---[ end trace 5a99fef82328e91a ]---
[ 3.458290] Kernel panic - not syncing: Fatal exception
[ 3.463659] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff)
[ 3.473965] ---[ end Kernel panic - not syncing: Fatal exception

--
Regards/Gruss,
Boris.

ECO tip #101: Trim your mails when you reply.
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