The following failure is seen in routine coverage builds: CC [M] drivers/scsi/arm/arxescsi.o /tmp/cccEyiO7.s: Assembler messages: /tmp/cccEyiO7.s:334: Error: symbol `.loop_1' is already defined /tmp/cccEyiO7.s:337: Error: symbol `.loop_2' is already defined /tmp/cccEyiO7.s:343: Error: symbol `.loop_3' is already defined /tmp/cccEyiO7.s:365: Error: symbol `.loop_1' is already defined /tmp/cccEyiO7.s:368: Error: symbol `.loop_2' is already defined /tmp/cccEyiO7.s:374: Error: symbol `.loop_3' is already defined make[4]: *** [drivers/scsi/arm/arxescsi.o] Error 1 It is caused by multiple inline of arxescsi_pseudo_dma_write() which is responsible for the above labels. Marking the fcn as non-inline fixes the issue. Arnd Bergmann considered un-inlinling vs fixing the loop[1] to use local labels and came to the following conclusion: The problem is mostly in the code: The symbols are defined in an inline assembly that is not meant to be instantiated multiple times. gcc may decide to unroll the loop in which this is done, which causes the error above. Unrolling the loop is a rather silly thing to do here, because the code is rather large and does not at all benefit from unrolling. You can use the patch below to fix the code to still work if the loop is unrolled, but I also think that marking the function as uninline is a good idea, in particular because I don't trust the old assembly to still do the right thing otherwise: It manually saves and restores the registers on the stack, where you nowadays would specify specific clobbers for the registers it uses, and let the compiler take care of it. It also doesn't contain a memory clobber for the buffer, so keeping the function out-of-line is probably the safe choice. [1] https://lkml.org/lkml/2011/12/1/189 Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx> CC: Arnd Bergmann <arnd@xxxxxxxx> CC: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx> --- v2: add desc. from Arnd indicating why un-inlining is the best choice diff --git a/drivers/scsi/arm/arxescsi.c b/drivers/scsi/arm/arxescsi.c index a750aa7..2608a9e 100644 --- a/drivers/scsi/arm/arxescsi.c +++ b/drivers/scsi/arm/arxescsi.c @@ -72,7 +72,8 @@ arxescsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp, return fasdma_pseudo; } -static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base) +static noinline void +arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base) { __asm__ __volatile__( " stmdb sp!, {r0-r12}\n" -- 1.7.7.2 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
