kernel.git/arch/arm/mm/alignment.c, branch linux-3.17.y

ARM: 8165/1: alignment: don't break misaligned NEON load/store

2014-09-25T14:32:57Z

The alignment fixup incorrectly decodes faulting ARM VLDn/VSTn instructions (where the optional alignment hint is given but incorrect) as LDR/STR, leading to register corruption. Detect these and correctly treat them as unhandled, so that userspace gets the fault it expects. Reported-by: Simon Hosie Signed-off-by: Robin Murphy Cc: Signed-off-by: Russell King

ARM: alignment: save last kernel aligned fault location

2014-07-18T11:29:06Z

Save and report (via the procfs file) the last kernel unaligned fault location. This allows us to trivially inspect where the last fault happened for cases which we don't expect to occur. Since we expect the kernel to generate misalignment faults (due to the networking layer), even when warnings are enabled, we don't log them for the kernel. Tested-by: Tony Lindgren Acked-by: Catalin Marinas Signed-off-by: Russell King

ARM: remove global cr_no_alignment

2014-06-02T08:20:18Z

cr_no_alignment is really only used by the alignment code. Since we no longer change the setting of cr_alignment after boot, we can localise this to alignment.c Signed-off-by: Russell King

ARM: remove CPU_CP15 conditional from alignment.c

2014-06-02T08:20:16Z

alignment.c will not be built unless CPU_CP15 is set: config CPU_CP15 bool config CPU_CP15_MMU bool select CPU_CP15 config ALIGNMENT_TRAP bool depends on CPU_CP15_MMU So there's no point having conditionals on CPU_CP15 within this code. Signed-off-by: Russell King

ARM: move "noalign" command line option to alignment.c

2014-06-02T08:20:13Z

Keep all bits of alignment handling together. Signed-off-by: Russell King

ARM: provide common method to clear bits in CPU control register

2014-06-02T08:20:11Z

Several places open-code this manipulation, let's consolidate this. Signed-off-by: Russell King

ARM: use get_cr() rather than cr_alignment

2014-05-22T15:27:27Z

Rather than reading the cr_alignment variable, use get_cr() to read directly from the hardware instead. We have two places where this occurs, neither of them are performance critical. Signed-off-by: Russell King

ARM: alignment: correctly decode instructions in BE8 mode.

2013-10-19T19:46:34Z

If we are in BE8 mode, we must deal with the instruction stream being in LE order when data is being loaded in BE order. Ensure the data is swapped before processing to avoid thre following: Change to using to provide the necessary conversion functions to change the byte ordering. This stops the following warning messages from the kernel on a fault: Unhandled fault: alignment exception (0x001) at 0xbfa09567 Alignment trap: not handling instruction 030091e8 at [<80333e8c>] Signed-off-by: Ben Dooks Reviewed-by: Dave Martin Tested-by: Thomas Petazzoni

Merge branch 'for-next' of git://git.pengutronix.de/git/ukl/linux into devel-stable

2013-03-09T15:49:32Z

Conflicts: arch/arm/include/asm/cputype.h Signed-off-by: Russell King

ARM: fix scheduling while atomic warning in alignment handling code

2013-02-25T16:10:42Z

Paolo Pisati reports that IPv6 triggers this warning: BUG: scheduling while atomic: swapper/0/0/0x40000100 Modules linked in: [] (unwind_backtrace+0x0/0xf0) from [] (__schedule_bug+0x48/0x5c) [] (__schedule_bug+0x48/0x5c) from [] (__schedule+0x700/0x740) [] (__schedule+0x700/0x740) from [] (__cond_resched+0x24/0x34) [] (__cond_resched+0x24/0x34) from [] (_cond_resched+0x3c/0x44) [] (_cond_resched+0x3c/0x44) from [] (do_alignment+0x178/0x78c) [] (do_alignment+0x178/0x78c) from [] (do_DataAbort+0x34/0x98) [] (do_DataAbort+0x34/0x98) from [] (__dabt_svc+0x40/0x60) Exception stack(0xc0763d70 to 0xc0763db8) 3d60: e97e805e e97e806e 2c000000 11000000 3d80: ea86bb00 0000002c 00000011 e97e807e c076d2a8 e97e805e e97e806e 0000002c 3da0: 3d000000 c0763dbc c04b98fc c02a8490 00000113 ffffffff [] (__dabt_svc+0x40/0x60) from [] (__csum_ipv6_magic+0x8/0xc8) Fix this by using probe_kernel_address() stead of __get_user(). Cc: Reported-by: Paolo Pisati Tested-by: Paolo Pisati Signed-off-by: Russell King