* [RFC 0/4] x86: keep TASK_SIZE in sync with mm->task_size
@ 2016-12-30 15:56 Dmitry Safonov
2016-12-30 15:56 ` [RFC 1/4] mm: remove unused TASK_SIZE_OF() Dmitry Safonov
0 siblings, 1 reply; 7+ messages in thread
From: Dmitry Safonov @ 2016-12-30 15:56 UTC (permalink / raw)
To: linux-kernel
Cc: 0x7f454c46, Dmitry Safonov, Thomas Gleixner, Ingo Molnar,
H. Peter Anvin, Andy Lutomirski, Kirill A . Shutemov, x86,
Catalin Marinas, Will Deacon, Ralf Baechle, James E.J. Bottomley,
Helge Deller, Benjamin Herrenschmidt, Paul Mackerras,
Michael Ellerman, Martin Schwidefsky, Heiko Carstens,
David S. Miller, Peter Zijlstra, linux-arm-kernel, linux-mips,
linux-parisc, linuxppc-dev, linux-s390, sparclinux
At this moment, we have following task_size-related things:
- TASK_SIZE_OF() macro, which is unused;
- current->mm->task_size which is used in half and TASK_SIZE() macro
which is used in the other half of code
- TIF_ADDR32, which is used to detect 32-bit address space and is
x86-specific, where some other arches misused TIF_32BIT
- personality ADDR_LIMIT_32BIT, which is used on arm/alpha
- ADDR_LIMIT_3GB, which is x86-specific and can be used to change
running task's TASK_SIZE 3GB <-> 4GB
This patches set removes unused definition of TASK_SIZE_OF (1),
defines TASK_SIZE macro as current->mm->task_size (3).
I would suggest define TASK_SIZE this way in generic version,
but currently I test it only on x86.
It also frees thread info flag (2) and adds arch_prctl()
on x86_64 to get/set current virtual address space size - as
it's needed by now only for CRIU, hide it under CHECKPOINT_RESTORE
config.
Hope those patches will help to clean task_size-related code
at least a bit (and helps me to restore vaddr limits).
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: x86@kernel.org
Dmitry Safonov (4):
mm: remove unused TASK_SIZE_OF()
x86/thread_info: kill TIF_ADDR32 in favour of ADDR_LIMIT_32BIT
x86/mm: define TASK_SIZE as current->mm->task_size
x86/arch_prctl: add ARCH_{GET,SET}_TASK_SIZE
arch/arm64/include/asm/memory.h | 2 --
arch/mips/include/asm/processor.h | 3 ---
arch/parisc/include/asm/processor.h | 3 +--
arch/powerpc/include/asm/processor.h | 3 +--
arch/s390/include/asm/processor.h | 3 +--
arch/sparc/include/asm/processor_64.h | 3 ---
arch/x86/include/asm/elf.h | 7 +++++--
arch/x86/include/asm/processor.h | 19 +++++++++----------
arch/x86/include/asm/thread_info.h | 4 +---
arch/x86/include/uapi/asm/prctl.h | 3 +++
arch/x86/kernel/process_64.c | 17 +++++++++++++++--
arch/x86/kernel/sys_x86_64.c | 4 ++--
arch/x86/um/asm/segment.h | 2 +-
arch/x86/xen/mmu.c | 4 ++--
fs/exec.c | 17 +++++++++++------
include/linux/sched.h | 4 ----
16 files changed, 52 insertions(+), 46 deletions(-)
--
2.11.0
^ permalink raw reply [flat|nested] 7+ messages in thread
* [RFC 1/4] mm: remove unused TASK_SIZE_OF()
2016-12-30 15:56 [RFC 0/4] x86: keep TASK_SIZE in sync with mm->task_size Dmitry Safonov
@ 2016-12-30 15:56 ` Dmitry Safonov
2016-12-31 1:36 ` Andy Lutomirski
` (3 more replies)
0 siblings, 4 replies; 7+ messages in thread
From: Dmitry Safonov @ 2016-12-30 15:56 UTC (permalink / raw)
To: linux-kernel
Cc: 0x7f454c46, Dmitry Safonov, Catalin Marinas, Will Deacon,
Ralf Baechle, James E.J. Bottomley, Helge Deller,
Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Martin Schwidefsky, Heiko Carstens, David S. Miller,
Peter Zijlstra, linux-arm-kernel, linux-mips, linux-parisc,
linuxppc-dev, linux-s390, sparclinux, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Andy Lutomirski, Kirill A. Shutemov,
x86
All users of TASK_SIZE_OF(tsk) have migrated to mm->task_size or
TASK_SIZE_MAX since:
commit d696ca016d57 ("x86/fsgsbase/64: Use TASK_SIZE_MAX for
FSBASE/GSBASE upper limits"),
commit a06db751c321 ("pagemap: check permissions and capabilities at
open time"),
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mips@linux-mips.org
Cc: linux-parisc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-s390@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
---
arch/arm64/include/asm/memory.h | 2 --
arch/mips/include/asm/processor.h | 3 ---
arch/parisc/include/asm/processor.h | 3 +--
arch/powerpc/include/asm/processor.h | 3 +--
arch/s390/include/asm/processor.h | 3 +--
arch/sparc/include/asm/processor_64.h | 3 ---
arch/x86/include/asm/processor.h | 2 --
include/linux/sched.h | 4 ----
8 files changed, 3 insertions(+), 20 deletions(-)
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index bfe632808d77..329bb4fd543c 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -80,8 +80,6 @@
#define TASK_SIZE_32 UL(0x100000000)
#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
TASK_SIZE_32 : TASK_SIZE_64)
-#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
- TASK_SIZE_32 : TASK_SIZE_64)
#else
#define TASK_SIZE TASK_SIZE_64
#endif /* CONFIG_COMPAT */
diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h
index 95b8c471f572..c2827a5507d4 100644
--- a/arch/mips/include/asm/processor.h
+++ b/arch/mips/include/asm/processor.h
@@ -73,9 +73,6 @@ extern unsigned int vced_count, vcei_count;
#define TASK_SIZE (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
#define STACK_TOP_MAX TASK_SIZE64
-#define TASK_SIZE_OF(tsk) \
- (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
-
#define TASK_IS_32BIT_ADDR test_thread_flag(TIF_32BIT_ADDR)
#endif
diff --git a/arch/parisc/include/asm/processor.h b/arch/parisc/include/asm/processor.h
index a3661ee6b060..8b51ddae8e4a 100644
--- a/arch/parisc/include/asm/processor.h
+++ b/arch/parisc/include/asm/processor.h
@@ -32,8 +32,7 @@
#define HAVE_ARCH_PICK_MMAP_LAYOUT
-#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size)
-#define TASK_SIZE TASK_SIZE_OF(current)
+#define TASK_SIZE (current->thread.task_size)
#define TASK_UNMAPPED_BASE (current->thread.map_base)
#define DEFAULT_TASK_SIZE32 (0xFFF00000UL)
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 1ba814436c73..04e575ead590 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -111,9 +111,8 @@ void release_thread(struct task_struct *);
*/
#define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
-#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
+#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
TASK_SIZE_USER32 : TASK_SIZE_USER64)
-#define TASK_SIZE TASK_SIZE_OF(current)
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 6bca916a5ba0..c53e8e2a51ac 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -89,10 +89,9 @@ extern void execve_tail(void);
* User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
*/
-#define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
(1UL << 30) : (1UL << 41))
-#define TASK_SIZE TASK_SIZE_OF(current)
+#define TASK_SIZE (current->mm->context.asce_limit)
#define TASK_MAX_SIZE (1UL << 53)
#define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
diff --git a/arch/sparc/include/asm/processor_64.h b/arch/sparc/include/asm/processor_64.h
index 6448cfc8292f..6ce1a75d7a24 100644
--- a/arch/sparc/include/asm/processor_64.h
+++ b/arch/sparc/include/asm/processor_64.h
@@ -36,9 +36,6 @@
#define VPTE_SIZE (1 << (VA_BITS - PAGE_SHIFT + 3))
#endif
-#define TASK_SIZE_OF(tsk) \
- (test_tsk_thread_flag(tsk,TIF_32BIT) ? \
- (1UL << 32UL) : ((unsigned long)-VPTE_SIZE))
#define TASK_SIZE \
(test_thread_flag(TIF_32BIT) ? \
(1UL << 32UL) : ((unsigned long)-VPTE_SIZE))
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index eaf100508c36..090a860b792a 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -819,8 +819,6 @@ static inline void spin_lock_prefetch(const void *x)
#define TASK_SIZE (test_thread_flag(TIF_ADDR32) ? \
IA32_PAGE_OFFSET : TASK_SIZE_MAX)
-#define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_ADDR32)) ? \
- IA32_PAGE_OFFSET : TASK_SIZE_MAX)
#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX TASK_SIZE_MAX
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4d1905245c7a..7a2e2f3f38a3 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -3610,10 +3610,6 @@ static inline void inc_syscw(struct task_struct *tsk)
}
#endif
-#ifndef TASK_SIZE_OF
-#define TASK_SIZE_OF(tsk) TASK_SIZE
-#endif
-
#ifdef CONFIG_MEMCG
extern void mm_update_next_owner(struct mm_struct *mm);
#else
--
2.11.0
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [RFC 1/4] mm: remove unused TASK_SIZE_OF()
2016-12-30 15:56 ` [RFC 1/4] mm: remove unused TASK_SIZE_OF() Dmitry Safonov
@ 2016-12-31 1:36 ` Andy Lutomirski
2017-01-02 6:57 ` Heiko Carstens
` (2 subsequent siblings)
3 siblings, 0 replies; 7+ messages in thread
From: Andy Lutomirski @ 2016-12-31 1:36 UTC (permalink / raw)
To: Dmitry Safonov
Cc: linux-kernel, Dmitry Safonov, Catalin Marinas, Will Deacon,
Ralf Baechle, James E.J. Bottomley, Helge Deller,
Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Martin Schwidefsky, Heiko Carstens, David S. Miller,
Peter Zijlstra, linux-arm-kernel, Linux MIPS Mailing List,
linux-parisc, linuxppc-dev, linux-s390, sparclinux,
Thomas Gleixner, Ingo Molnar, H. Peter Anvin, Andy Lutomirski,
Kirill A. Shutemov, X86 ML
On Fri, Dec 30, 2016 at 7:56 AM, Dmitry Safonov <dsafonov@virtuozzo.com> wrote:
> All users of TASK_SIZE_OF(tsk) have migrated to mm->task_size or
> TASK_SIZE_MAX since:
> commit d696ca016d57 ("x86/fsgsbase/64: Use TASK_SIZE_MAX for
> FSBASE/GSBASE upper limits"),
> commit a06db751c321 ("pagemap: check permissions and capabilities at
> open time"),
I like this.
Reviewed-by: Andy Lutomirski <luto@kernel.org> # for x86
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [RFC 1/4] mm: remove unused TASK_SIZE_OF()
2016-12-30 15:56 ` [RFC 1/4] mm: remove unused TASK_SIZE_OF() Dmitry Safonov
2016-12-31 1:36 ` Andy Lutomirski
@ 2017-01-02 6:57 ` Heiko Carstens
2017-01-02 9:53 ` Kirill A. Shutemov
2017-01-05 9:51 ` David Laight
3 siblings, 0 replies; 7+ messages in thread
From: Heiko Carstens @ 2017-01-02 6:57 UTC (permalink / raw)
To: Dmitry Safonov
Cc: linux-kernel, 0x7f454c46, Catalin Marinas, Will Deacon,
Ralf Baechle, James E.J. Bottomley, Helge Deller,
Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Martin Schwidefsky, David S. Miller, Peter Zijlstra,
linux-arm-kernel, linux-mips, linux-parisc, linuxppc-dev,
linux-s390, sparclinux, Thomas Gleixner, Ingo Molnar,
H. Peter Anvin, Andy Lutomirski, Kirill A. Shutemov, x86
On Fri, Dec 30, 2016 at 06:56:31PM +0300, Dmitry Safonov wrote:
> All users of TASK_SIZE_OF(tsk) have migrated to mm->task_size or
> TASK_SIZE_MAX since:
> commit d696ca016d57 ("x86/fsgsbase/64: Use TASK_SIZE_MAX for
> FSBASE/GSBASE upper limits"),
> commit a06db751c321 ("pagemap: check permissions and capabilities at
> open time"),
>
> Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
> ---
...
> diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
> index 6bca916a5ba0..c53e8e2a51ac 100644
> --- a/arch/s390/include/asm/processor.h
> +++ b/arch/s390/include/asm/processor.h
> @@ -89,10 +89,9 @@ extern void execve_tail(void);
> * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
> */
>
> -#define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
> #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
> (1UL << 30) : (1UL << 41))
> -#define TASK_SIZE TASK_SIZE_OF(current)
> +#define TASK_SIZE (current->mm->context.asce_limit)
> #define TASK_MAX_SIZE (1UL << 53)
>
> #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
FWIW, for the s390 part:
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [RFC 1/4] mm: remove unused TASK_SIZE_OF()
2016-12-30 15:56 ` [RFC 1/4] mm: remove unused TASK_SIZE_OF() Dmitry Safonov
2016-12-31 1:36 ` Andy Lutomirski
2017-01-02 6:57 ` Heiko Carstens
@ 2017-01-02 9:53 ` Kirill A. Shutemov
2017-01-05 9:51 ` David Laight
3 siblings, 0 replies; 7+ messages in thread
From: Kirill A. Shutemov @ 2017-01-02 9:53 UTC (permalink / raw)
To: Dmitry Safonov
Cc: linux-kernel, 0x7f454c46, Catalin Marinas, Will Deacon,
Ralf Baechle, James E.J. Bottomley, Helge Deller,
Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Martin Schwidefsky, Heiko Carstens, David S. Miller,
Peter Zijlstra, linux-arm-kernel, linux-mips, linux-parisc,
linuxppc-dev, linux-s390, sparclinux, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Andy Lutomirski, Kirill A. Shutemov,
x86
On Fri, Dec 30, 2016 at 06:56:31PM +0300, Dmitry Safonov wrote:
> All users of TASK_SIZE_OF(tsk) have migrated to mm->task_size or
> TASK_SIZE_MAX since:
> commit d696ca016d57 ("x86/fsgsbase/64: Use TASK_SIZE_MAX for
> FSBASE/GSBASE upper limits"),
> commit a06db751c321 ("pagemap: check permissions and capabilities at
> open time"),
>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: Ralf Baechle <ralf@linux-mips.org>
> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
> Cc: Helge Deller <deller@gmx.de>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
> Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-mips@linux-mips.org
> Cc: linux-parisc@vger.kernel.org
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-s390@vger.kernel.org
> Cc: sparclinux@vger.kernel.org
> Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
I've noticed this too.
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
--
Kirill A. Shutemov
^ permalink raw reply [flat|nested] 7+ messages in thread
* RE: [RFC 1/4] mm: remove unused TASK_SIZE_OF()
2016-12-30 15:56 ` [RFC 1/4] mm: remove unused TASK_SIZE_OF() Dmitry Safonov
` (2 preceding siblings ...)
2017-01-02 9:53 ` Kirill A. Shutemov
@ 2017-01-05 9:51 ` David Laight
2017-01-05 17:54 ` Andy Lutomirski
3 siblings, 1 reply; 7+ messages in thread
From: David Laight @ 2017-01-05 9:51 UTC (permalink / raw)
To: 'Dmitry Safonov', linux-kernel
Cc: linux-mips, Peter Zijlstra, Heiko Carstens, Paul Mackerras,
H. Peter Anvin, sparclinux, linux-s390, Helge Deller, x86,
James E.J. Bottomley, Will Deacon, Ingo Molnar, Catalin Marinas,
0x7f454c46, Andy Lutomirski, Thomas Gleixner, linux-arm-kernel,
linux-parisc, Ralf Baechle, Martin Schwidefsky, linuxppc-dev,
David S. Miller, Kirill A. Shutemov
From: Dmitry Safonov
> Sent: 30 December 2016 15:57
> All users of TASK_SIZE_OF(tsk) have migrated to mm->task_size or
> TASK_SIZE_MAX since:
> commit d696ca016d57 ("x86/fsgsbase/64: Use TASK_SIZE_MAX for
> FSBASE/GSBASE upper limits"),
> commit a06db751c321 ("pagemap: check permissions and capabilities at
> open time"),
...
> +#define TASK_SIZE (current->thread.task_size)
I'm not sure I like he hidden 'current' argument to an
apparent constant.
David
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [RFC 1/4] mm: remove unused TASK_SIZE_OF()
2017-01-05 9:51 ` David Laight
@ 2017-01-05 17:54 ` Andy Lutomirski
0 siblings, 0 replies; 7+ messages in thread
From: Andy Lutomirski @ 2017-01-05 17:54 UTC (permalink / raw)
To: David Laight
Cc: Dmitry Safonov, linux-kernel, linux-mips, Peter Zijlstra,
Heiko Carstens, Paul Mackerras, H. Peter Anvin, sparclinux,
linux-s390, Helge Deller, x86, James E.J. Bottomley, Will Deacon,
Ingo Molnar, Catalin Marinas, 0x7f454c46, Andy Lutomirski,
Thomas Gleixner, linux-arm-kernel, linux-parisc, Ralf Baechle,
Martin Schwidefsky, linuxppc-dev, David S. Miller,
Kirill A. Shutemov
On Thu, Jan 5, 2017 at 1:51 AM, David Laight <David.Laight@aculab.com> wrote:
> From: Dmitry Safonov
>> Sent: 30 December 2016 15:57
>> All users of TASK_SIZE_OF(tsk) have migrated to mm->task_size or
>> TASK_SIZE_MAX since:
>> commit d696ca016d57 ("x86/fsgsbase/64: Use TASK_SIZE_MAX for
>> FSBASE/GSBASE upper limits"),
>> commit a06db751c321 ("pagemap: check permissions and capabilities at
>> open time"),
> ...
>> +#define TASK_SIZE (current->thread.task_size)
>
> I'm not sure I like he hidden 'current' argument to an
> apparent constant.
Me neither. But this patch is merely changing the implementation.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2017-01-05 17:54 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2016-12-30 15:56 [RFC 0/4] x86: keep TASK_SIZE in sync with mm->task_size Dmitry Safonov
2016-12-30 15:56 ` [RFC 1/4] mm: remove unused TASK_SIZE_OF() Dmitry Safonov
2016-12-31 1:36 ` Andy Lutomirski
2017-01-02 6:57 ` Heiko Carstens
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