Julien Grall fdb17ddd0a arm/xen: Use alloc_percpu rather than __alloc_percpu ... commit 24d5373dda upstream. The function xen_guest_init is using __alloc_percpu with an alignment which are not power of two. However, the percpu allocator never supported alignments which are not power of two and has always behaved incorectly in thise case. Commit 3ca45a4 "percpu: ensure requested alignment is power of two" introduced a check which trigger a warning [1] when booting linux-next on Xen. But in reality this bug was always present. This can be fixed by replacing the call to __alloc_percpu with alloc_percpu. The latter will use an alignment which are a power of two. [1] [ 0.023921] illegal size (48) or align (48) for percpu allocation [ 0.024167] ------------[ cut here ]------------ [ 0.024344] WARNING: CPU: 0 PID: 1 at linux/mm/percpu.c:892 pcpu_alloc+0x88/0x6c0 [ 0.024584] Modules linked in: [ 0.024708] [ 0.024804] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.9.0-rc7-next-20161128 #473 [ 0.025012] Hardware name: Foundation-v8A (DT) [ 0.025162] task: ffff80003d870000 task.stack: ffff80003d844000 [ 0.025351] PC is at pcpu_alloc+0x88/0x6c0 [ 0.025490] LR is at pcpu_alloc+0x88/0x6c0 [ 0.025624] pc : [<ffff00000818e678>] lr : [<ffff00000818e678>] pstate: 60000045 [ 0.025830] sp : ffff80003d847cd0 [ 0.025946] x29: ffff80003d847cd0 x28: 0000000000000000 [ 0.026147] x27: 0000000000000000 x26: 0000000000000000 [ 0.026348] x25: 0000000000000000 x24: 0000000000000000 [ 0.026549] x23: 0000000000000000 x22: 00000000024000c0 [ 0.026752] x21: ffff000008e97000 x20: 0000000000000000 [ 0.026953] x19: 0000000000000030 x18: 0000000000000010 [ 0.027155] x17: 0000000000000a3f x16: 00000000deadbeef [ 0.027357] x15: 0000000000000006 x14: ffff000088f79c3f [ 0.027573] x13: ffff000008f79c4d x12: 0000000000000041 [ 0.027782] x11: 0000000000000006 x10: 0000000000000042 [ 0.027995] x9 : ffff80003d847a40 x8 : 6f697461636f6c6c [ 0.028208] x7 : 6120757063726570 x6 : ffff000008f79c84 [ 0.028419] x5 : 0000000000000005 x4 : 0000000000000000 [ 0.028628] x3 : 0000000000000000 x2 : 000000000000017f [ 0.028840] x1 : ffff80003d870000 x0 : 0000000000000035 [ 0.029056] [ 0.029152] ---[ end trace 0000000000000000 ]--- [ 0.029297] Call trace: [ 0.029403] Exception stack(0xffff80003d847b00 to 0xffff80003d847c30) [ 0.029621] 7b00: 0000000000000030 0001000000000000 ffff80003d847cd0 ffff00000818e678 [ 0.029901] 7b20: 0000000000000002 0000000000000004 ffff000008f7c060 0000000000000035 [ 0.030153] 7b40: ffff000008f79000 ffff000008c4cd88 ffff80003d847bf0 ffff000008101778 [ 0.030402] 7b60: 0000000000000030 0000000000000000 ffff000008e97000 00000000024000c0 [ 0.030647] 7b80: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 0.030895] 7ba0: 0000000000000035 ffff80003d870000 000000000000017f 0000000000000000 [ 0.031144] 7bc0: 0000000000000000 0000000000000005 ffff000008f79c84 6120757063726570 [ 0.031394] 7be0: 6f697461636f6c6c ffff80003d847a40 0000000000000042 0000000000000006 [ 0.031643] 7c00: 0000000000000041 ffff000008f79c4d ffff000088f79c3f 0000000000000006 [ 0.031877] 7c20: 00000000deadbeef 0000000000000a3f [ 0.032051] [<ffff00000818e678>] pcpu_alloc+0x88/0x6c0 [ 0.032229] [<ffff00000818ece8>] __alloc_percpu+0x18/0x20 [ 0.032409] [<ffff000008d9606c>] xen_guest_init+0x174/0x2f4 [ 0.032591] [<ffff0000080830f8>] do_one_initcall+0x38/0x130 [ 0.032783] [<ffff000008d90c34>] kernel_init_freeable+0xe0/0x248 [ 0.032995] [<ffff00000899a890>] kernel_init+0x10/0x100 [ 0.033172] [<ffff000008082ec0>] ret_from_fork+0x10/0x50 Reported-by: Wei Chen <wei.chen@arm.com> Link: https://lkml.org/lkml/2016/11/28/669 Signed-off-by: Julien Grall <julien.grall@arm.com> Signed-off-by: Stefano Stabellini <sstabellini@kernel.org> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2017-01-06 11:16:17 +01:00
..
alpha	alpha: fix copy_from_user()	2016-09-24 10:07:45 +02:00
arc	ARC: Don't use "+l" inline asm constraint	2016-12-08 07:15:24 +01:00
arm	arm/xen: Use alloc_percpu rather than __alloc_percpu	2017-01-06 11:16:17 +01:00
arm64	arm64: futex.h: Add missing PAN toggling	2016-12-15 08:49:23 -08:00
avr32	avr32: off by one in at32_init_pio()	2016-10-07 15:23:45 +02:00
blackfin	net: smc91x: fix SMC accesses	2016-09-30 10:18:37 +02:00
c6x
cris	cris: buggered copy_from_user/copy_to_user/clear_user	2016-09-24 10:07:44 +02:00
frv	frv: fix clear_user()	2016-09-24 10:07:44 +02:00
h8300	h8300: fix syscall restarting	2016-11-10 16:36:32 +01:00
hexagon	hexagon: fix strncpy_from_user() error return	2016-09-24 10:07:44 +02:00
ia64	ia64: copy_from_user() should zero the destination on access_ok() failure	2016-09-24 10:07:46 +02:00
m32r	m32r: fix __get_user()	2016-09-24 10:07:43 +02:00
m68k	m68k: Fix ndelay() macro	2016-12-15 08:49:23 -08:00
metag	metag: Only define atomic_dec_if_positive conditionally	2016-10-28 03:01:31 -04:00
microblaze	microblaze: fix copy_from_user()	2016-09-24 10:07:43 +02:00
mips	KVM: MIPS: Precalculate MMIO load resume PC	2016-11-18 10:48:36 +01:00
mn10300	mn10300: copy_from_user() should zero on access_ok() failure...	2016-09-24 10:07:45 +02:00
nios2	nios2: copy_from_user() should zero the tail of destination	2016-09-24 10:07:45 +02:00
openrisc	openrisc: fix the fix of copy_from_user()	2016-09-24 10:07:46 +02:00
parisc	parisc: Fix TLB related boot crash on SMP machines	2016-12-15 08:49:22 -08:00
powerpc	powerpc/eeh: Fix deadlock when PE frozen state can't be cleared	2016-12-15 08:49:21 -08:00
s390	s390/hypfs: Use get_free_page() instead of kmalloc to ensure page alignment	2016-11-18 10:48:34 +01:00
score	score: fix copy_from_user() and friends	2016-09-24 10:07:44 +02:00
sh	sh: fix copy_from_user()	2016-09-24 10:07:44 +02:00
sparc	sparc64: fix compile warning section mismatch in find_node()	2016-12-10 19:07:25 +01:00
tile	tile: avoid using clocksource_cyc2ns with absolute cycle count	2016-12-02 09:09:01 +01:00
um	um: Don't discard .text.exit section	2016-09-07 08:32:38 +02:00
unicore32	pwm: Changes for v4.4-rc1	2015-11-11 09:16:10 -08:00
x86	perf/x86: Fix full width counter, counter overflow	2016-12-15 08:49:22 -08:00
xtensa	xtensa: clear all DBREAKC registers on start	2016-04-12 09:08:55 -07:00
.gitignore
Kconfig