* Grygorii Strashko | 2016-01-15 16:20:47 [+0200]:
>Now the random crashes are observed on ARM TI am437x-idk-evm used with
>-RT Kernel v4.4-rt2 and with Highmem enabled.
>
>The reason of issue is that, newly introduced switch_kmaps() does not
>take into account FIX_KMAP_BEGIN, which was re-added by
>commit a5f4c561b3b1 ("ARM: 8415/1: early fixmap support for earlycon")
>(K4.3) for ARM and since that the value of FIX_KMAP_BEGIN
>is not 0 any more.
>
>Hence update switch_kmaps() so it will take into FIX_KMAP_BEGIN while
>calculating fixmap idx. This patch also introduces fixmap_idx() to
>make code simpler and remove duplicated code.
Thank you debugging and fixing this. I will fold this into the initial
patch since it is a v4.1..v4.4 fallout. Regarding your "nobody else be
me" question in the other mail: once I managed something ARM+highmem I
I see this:
|Welcome to Debian GNU/Linux stretch/sid!
|
|[ 11.738637] systemd[1]: Set hostname to <vexpress>.
|[ 11.909949] ------------[ cut here ]------------
|[ 11.909958] kernel BUG at arch/arm/mm/highmem.c:90!
So I did not get as far as a shell to start anything.
>Signed-off-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
>Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Sebastian
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