linux/arch/s390/lib, branch v3.7

s390/mm: use pmd_large() instead of pmd_huge()

2012-10-26T14:44:23Z

Without CONFIG_HUGETLB_PAGE, pmd_huge() will always return 0. So pmd_large() should be used instead in places where both transparent huge pages and hugetlbfs pages can occur. Signed-off-by: Gerald Schaefer Signed-off-by: Martin Schwidefsky

s390/string: provide asm lib functions for memcpy and memcmp

2012-09-26T13:44:50Z

Our memcpy and memcmp variants were implemented by calling the corresponding gcc builtin variants. However gcc is free to replace a call to __builtin_memcmp with a call to memcmp which, when called, will result in an endless recursion within memcmp. So let's provide asm variants and also fix the variants that are used for uncompressing the kernel image. In addition remove all other occurences of builtin function calls. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/mm: fix user access page-table walk code

2012-09-17T07:44:24Z

The s390 page-table walk code, used for user copy and futex, currently cannot handle huge pages. As far as user copy is concerned, that is not really a problem because those functions will only be used on old hardware that has no huge page support. But the futex code will also use pagetable walk functions on current hardware when user space runs in primary space mode. So, if a futex sits in a huge page, the futex operation on it will result in a page fault loop or even data corruption. This patch adds the code for resolving huge page mappings in the user access pagetable walk code on s390. Signed-off-by: Gerald Schaefer Signed-off-by: Martin Schwidefsky

s390/vtimer: rework virtual timer interface

2012-07-20T09:15:08Z

The current virtual timer interface is inherently per-cpu and hard to use. The sole user of the interface is appldata which uses it to execute a function after a specific amount of cputime has been used over all cpus. Rework the virtual timer interface to hook into the cputime accounting. This makes the interface independent from the CPU timer interrupts, and makes the virtual timers global as opposed to per-cpu. Overall the code is greatly simplified. The downside is that the accuracy is not as good as the original implementation, but it is still good enough for appldata. Reviewed-by: Jan Glauber Reviewed-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/comments: unify copyright messages and remove file names

2012-07-20T09:15:04Z

Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens

s390/headers: replace s390x with CONFIG_64BIT where possible

2012-05-24T08:10:10Z

Replace __s390x__ with CONFIG_64BIT in all places that are not exported to userspace or guarded with #ifdef __KERNEL__. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

[S390] rework idle code

2012-03-11T15:59:28Z

Whenever the cpu loads an enabled wait PSW it will appear as idle to the underlying host system. The code in default_idle calls vtime_stop_cpu which does the necessary voodoo to get the cpu time accounting right. The udelay code just loads an enabled wait PSW. To correct this rework the vtime_stop_cpu/vtime_start_cpu logic and move the difficult parts to entry[64].S, vtime_stop_cpu can now be called from anywhere and vtime_start_cpu is gone. The correction of the cpu time during wakeup from an enabled wait PSW is done with a critical section in entry[64].S. As vtime_start_cpu is gone, s390_idle_check can be removed as well. Signed-off-by: Martin Schwidefsky

[S390] rework smp code

2012-03-11T15:59:28Z

Define struct pcpu and merge some of the NR_CPUS arrays into it, including __cpu_logical_map, current_set and smp_cpu_state. Split smp related functions to those operating on physical cpus and the functions operating on a logical cpu number. Make the functions for physical cpus use a pointer to a struct pcpu. This hides the knowledge about cpu addresses in smp.c, entry[64].S and swsusp_asm64.S, thus remove the sigp.h header. The PSW restart mechanism is used to start secondary cpus, calling a function on an online cpu, calling a function on the ipl cpu, and for the nmi signal. Replace the different assembler functions with a single function restart_int_handler. The new entry point calls a function whose pointer is stored in the lowcore of the target cpu and it can wait for the source cpu to stop. This covers all existing use cases. Overall the code is now simpler and there are ~380 lines less code. Reviewed-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

[S390] sparse: fix sparse warnings with __user pointers

2011-10-30T14:16:46Z

Use __force to quiet sparse warnings about user address space. Signed-off-by: Martin Schwidefsky

[S390] cleanup psw related bits and pieces

2011-10-30T14:16:43Z

Split out addressing mode bits from PSW_BASE_BITS, rename PSW_BASE_BITS to PSW_MASK_BASE, get rid of psw_user32_bits, remove unused function enabled_wait(), introduce PSW_MASK_USER, and drop PSW_MASK_MERGE macros. Change psw_kernel_bits / psw_user_bits to contain only the bits that are always set in the respective mode. Signed-off-by: Martin Schwidefsky