On 18 January 2011 06:00, Nicolas Pitre <[email protected]> wrote: > On Mon, 17 Jan 2011, Russell King - ARM Linux wrote: > >> Add additional instructions to our assembly bitops functions to ensure >> that they only operate on word-aligned pointers. This will be necessary >> when we switch these operations to use the word-based exclusive >> operations. >> >> Signed-off-by: Russell King <[email protected]> > > This breaks the Thumb2 kernel build: > > AS arch/arm/lib/changebit.o > arch/arm/lib/changebit.S: Assembler messages: > arch/arm/lib/changebit.S:16: Error: Thumb does not support negative register > indexing -- `strne r1,[r1,-r1]' > > I also wonder what happens with a misaligned ldrex/strex... Does the > alignment trap get invoked?
According to the ARM ARM, unaligned ldrex/strex should generate an alignment fault on ARMv6 (with SCTLR.U bit set) and ARMv7. -- Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
