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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
Download Patch File Download Diff File Expand all files Collapse all files

16
arch/s390/kernel/vdso.c
View File

@@ -32,19 +32,17 @@
#include <asm/vdso.h>
#include <asm/facility.h>
#if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT)
#ifdef CONFIG_COMPAT
extern char vdso32_start, vdso32_end;
static void *vdso32_kbase = &vdso32_start;
static unsigned int vdso32_pages;
static struct page **vdso32_pagelist;
#endif
#ifdef CONFIG_64BIT
extern char vdso64_start, vdso64_end;
static void *vdso64_kbase = &vdso64_start;
static unsigned int vdso64_pages;
static struct page **vdso64_pagelist;
#endif /* CONFIG_64BIT */
/*
* Should the kernel map a VDSO page into processes and pass its
@@ -87,7 +85,6 @@ static void vdso_init_data(struct vdso_data *vd)
vd->ectg_available = test_facility(31);
}
#ifdef CONFIG_64BIT
/*
* Allocate/free per cpu vdso data.
*/
@@ -169,7 +166,6 @@ static void vdso_init_cr5(void)
cr5 = offsetof(struct _lowcore, paste);
__ctl_load(cr5, 5, 5);
}
#endif /* CONFIG_64BIT */
/*
* This is called from binfmt_elf, we create the special vma for the
@@ -191,7 +187,6 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
if (!uses_interp)
return 0;
#ifdef CONFIG_64BIT
vdso_pagelist = vdso64_pagelist;
vdso_pages = vdso64_pages;
#ifdef CONFIG_COMPAT
@@ -200,11 +195,6 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
vdso_pages = vdso32_pages;
}
#endif
#else
vdso_pagelist = vdso32_pagelist;
vdso_pages = vdso32_pages;
#endif
/*
* vDSO has a problem and was disabled, just don't "enable" it for
* the process
@@ -268,7 +258,7 @@ static int __init vdso_init(void)
if (!vdso_enabled)
return 0;
vdso_init_data(vdso_data);
#if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT)
#ifdef CONFIG_COMPAT
/* Calculate the size of the 32 bit vDSO */
vdso32_pages = ((&vdso32_end - &vdso32_start
+ PAGE_SIZE - 1) >> PAGE_SHIFT) + 1;
@@ -287,7 +277,6 @@ static int __init vdso_init(void)
vdso32_pagelist[vdso32_pages] = NULL;
#endif
#ifdef CONFIG_64BIT
/* Calculate the size of the 64 bit vDSO */
vdso64_pages = ((&vdso64_end - &vdso64_start
+ PAGE_SIZE - 1) >> PAGE_SHIFT) + 1;
@@ -307,7 +296,6 @@ static int __init vdso_init(void)
if (vdso_alloc_per_cpu(&S390_lowcore))
BUG();
vdso_init_cr5();
#endif /* CONFIG_64BIT */
get_page(virt_to_page(vdso_data));