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s390: remove 31 bit support

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Remove the 31 bit support in order to reduce maintenance cost and
effectively remove dead code. Since a couple of years there is no
distribution left that comes with a 31 bit kernel.

The 31 bit kernel also has been broken since more than a year before
anybody noticed. In addition I added a removal warning to the kernel
shown at ipl for 5 minutes: a960062e58 ("s390: add 31 bit warning
message") which let everybody know about the plan to remove 31 bit
code. We didn't get any response.

Given that the last 31 bit only machine was introduced in 1999 let's
remove the code.
Anybody with 31 bit user space code can still use the compat mode.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2015-02-12 13:08:27 +01:00
committed by Martin Schwidefsky
parent 1833c9f647
commit 5a79859ae0
97 changed files with 170 additions and 6016 deletions
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49
arch/s390/kernel/sys_s390.c
View File

@@ -76,7 +76,6 @@ SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
return sys_ipc(call, first, second, third, ptr, third);
}
#ifdef CONFIG_64BIT
SYSCALL_DEFINE1(s390_personality, unsigned int, personality)
{
unsigned int ret;
@@ -90,51 +89,3 @@ SYSCALL_DEFINE1(s390_personality, unsigned int, personality)
return ret;
}
#endif /* CONFIG_64BIT */
/*
* Wrapper function for sys_fadvise64/fadvise64_64
*/
#ifndef CONFIG_64BIT
SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, offset_high, u32, offset_low,
size_t, len, int, advice)
{
return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low,
len, advice);
}
struct fadvise64_64_args {
int fd;
long long offset;
long long len;
int advice;
};
SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
{
struct fadvise64_64_args a;
if ( copy_from_user(&a, args, sizeof(a)) )
return -EFAULT;
return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
}
/*
* 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
*/
SYSCALL_DEFINE5(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