Messages in this thread | | | Date | Wed, 25 Feb 2015 17:02:50 +0000 | From | Russell King - ARM Linux <> | Subject | Re: [RFC PATCH] arm: asm/cmpxchg.h: Add support half-word xchg() |
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On Wed, Feb 25, 2015 at 04:58:35PM +0100, Arnd Bergmann wrote: > On Wednesday 25 February 2015 10:36:20 Pranith Kumar wrote: > > This patch adds support for a half-word xchg() for ARM using ldrexh/strexh > > instructions. It also fixes an asm comment for __cmpxchg2. > > > > Currently using a half-word xchg() results in the following splat on an ARMv7 > > machine. > > > > [ 45.833303] xchg: bad data size: pc 0xbe806020, ptr 0xeb18deee, size 2 > > [ 45.833324] ------------[ cut here ]------------ > > [ 45.837939] kernel BUG at /dvs/git/dirty/git-master_linux/kernel/arch/arm/kernel/traps.c:727! > > > > Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> > > Unfortunately, the BUG message seems incomplete, can you reproduce this > with CONFIG_DEBUG_BUGVERBOSE enabled?
That isn't because CONFIG_DEBUG_BUGVERBOSE isn't set. It's because the message author decided that the remainder of the kernel bug message wasn't useful to report. After all, it's just a load of hex numbers and symbolic information. Who would want that junk.
(Some people really don't get this: we print stuff from the kernel because it gives _us_ useful information to debug problems like this, but because they don't understand it themselves, they decide they can omit it from their bug reports...)
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