diff options
author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-28 19:33:23 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-28 19:33:23 -0700 |
commit | 9873aed5a90aefb1642a85070c35088cca8b6a92 (patch) | |
tree | be7d6cf2a3e0c71faa861e0c5d0c9bc4c5f40a10 /arch/s390/kernel/sys_s390.c | |
parent | 7b5573769f26a23518b33a64ec129d2833564877 (diff) | |
parent | 5aaaf9f0ed11882fe7c6bc4202f78da1baa8caba (diff) |
Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6
* 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6:
[S390] Fix sclp_vt220 error handling.
[S390] cio: Reorganize initialization.
[S390] cio: Make CIO_* macros safe if dbfs are not available.
[S390] cio: Clean up messages.
[S390] Fix IRQ tracing.
[S390] vmur: fix diag14_read.
[S390] Wire up sys_fallocate.
[S390] add types.h include to s390_ext.h
[S390] cio: Remove deprecated rdc/rcd.
[S390] Get rid of new section mismatch warnings.
[S390] sclp: kill unused SCLP config option.
[S390] cio: Remove remains of _ccw_device_get_device_number().
[S390] cio: css_sch_device_register() can be made static.
[S390] Improve __smp_call_function_map.
[S390] Convert to smp_call_function_single.
Diffstat (limited to 'arch/s390/kernel/sys_s390.c')
-rw-r--r-- | arch/s390/kernel/sys_s390.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/s390/kernel/sys_s390.c b/arch/s390/kernel/sys_s390.c index 1c90c7e9997..13e27bdb96e 100644 --- a/arch/s390/kernel/sys_s390.c +++ b/arch/s390/kernel/sys_s390.c @@ -265,3 +265,23 @@ s390_fadvise64_64(struct fadvise64_64_args __user *args) return -EFAULT; return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); } + +#ifndef CONFIG_64BIT +/* + * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last + * 64 bit argument "len" is split into the upper and lower 32 bits. The + * system call wrapper in the user space loads the value to %r6/%r7. + * The code in entry.S keeps the values in %r2 - %r6 where they are and + * stores %r7 to 96(%r15). But the standard C linkage requires that + * the whole 64 bit value for len is stored on the stack and doesn't + * use %r6 at all. So s390_fallocate has to convert the arguments from + * %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len + * to + * %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len + */ +asmlinkage long s390_fallocate(int fd, int mode, loff_t offset, + u32 len_high, u32 len_low) +{ + return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low); +} +#endif |