On Mon, Jul 20, 2015 at 07:41:55AM -0700, Guenter Roeck wrote:
> Commit 0c8c0f03e3a2 ("x86/fpu, sched: Dynamically allocate 'struct fpu'")
> moved the thread_struct to the bottom of task_struct. As a result, the
> offset is now too large to be used in an immediate stfpc operation on s390,
> resulting in the following compile error.
>
> arch/s390/kernel/traps.c: Assembler messages:
> arch/s390/kernel/traps.c:262: Error: operand out of range
> (0x00000000000023e8 is not between 0x0000000000000000 and 0x0000000000000fff)
> arch/s390/kernel/traps.c:300: Error: operand out of range
> (0x00000000000023e8 is not between 0x0000000000000000 and 0x0000000000000fff)
>
> Use a local variable to store fpc to solve the problem.
>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
> Compile tested only.
> Wonder if storing fpc in current->thread.fp_regs.fpc is necessary.
A proper patch is availabler here:
https://git.kernel.org/cgit/linux/kernel/git/s390/linux.git/commit/?h=for-linus&id=3827ec3d8fd51aef8352b0282b14f0f3ab615930
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