Re: [PATCH V15 14/18] block: enable multipage bvecs

[Ming Lei]

On Wed, Feb 27, 2019 at 08:47:09PM +0000, Jon Hunter wrote:
> 
> On 21/02/2019 08:42, Marek Szyprowski wrote:
> > Dear All,
> > 
> > On 2019-02-15 12:13, Ming Lei wrote:
> >> This patch pulls the trigger for multi-page bvecs.
> >>
> >> Reviewed-by: Omar Sandoval <osandov@xxxxxx>
> >> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
> > 
> > Since Linux next-20190218 I've observed problems with block layer on one
> > of my test devices (Odroid U3 with EXT4 rootfs on SD card). Bisecting
> > this issue led me to this change. This is also the first linux-next
> > release with this change merged. The issue is fully reproducible and can
> > be observed in the following kernel log:
> > 
> > sdhci: Secure Digital Host Controller Interface driver
> > sdhci: Copyright(c) Pierre Ossman
> > s3c-sdhci 12530000.sdhci: clock source 2: mmc_busclk.2 (100000000 Hz)
> > s3c-sdhci 12530000.sdhci: Got CD GPIO
> > mmc0: SDHCI controller on samsung-hsmmc [12530000.sdhci] using ADMA
> > mmc0: new high speed SDHC card at address aaaa
> > mmcblk0: mmc0:aaaa SL16G 14.8 GiB
> I have also noticed some failures when writing to an eMMC device on one
> of our Tegra boards. We have a simple eMMC write/read test and it is
> currently failing because the data written does not match the source.
> 
> I did not seem the same crash as reported here, however, in our case the
> rootfs is NFS mounted and so probably would not. However, the bisect
> points to this commit and reverting on top of -next fixes the issues.

It is sdhci, probably related with max segment size, could you test the
following patch:

https://marc.info/?l=linux-mmc&m=155128334122951&w=2

Thanks,
Ming