The patch titled
maps4: rework TASK_SIZE macros
has been added to the -mm tree. Its filename is
maps4-rework-task_size-macros.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: maps4: rework TASK_SIZE macros
From: Dave Hansen <haveblue@xxxxxxxxxx>
The following replaces the earlier patches sent. It should address
David Rientjes's comments, and has been compile tested on all the
architectures that it touches, save for parisc.
For the /proc/<pid>/pagemap code[1], we need to able to query how
much virtual address space a particular task has. The trick is
that we do it through /proc and can't use TASK_SIZE since it
references "current" on some arches. The process opening the
/proc file might be a 32-bit process opening a 64-bit process's
pagemap file.
x86_64 already has a TASK_SIZE_OF() macro:
#define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64)
I'd like to have that for other architectures. So, add it
for all the architectures that actually use "current" in
their TASK_SIZE. For the others, just add a quick #define
in sched.h to use plain old TASK_SIZE.
1. http://www.linuxworld.com/news/2007/042407-kernel.html
- MIPS portion from Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Dave Hansen <haveblue@xxxxxxxxxx>
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Matt Mackall <mpm@xxxxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Dave Hansen <haveblue@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-ia64/processor.h | 3 ++-
include/asm-mips/processor.h | 4 ++++
include/asm-parisc/processor.h | 3 ++-
include/asm-powerpc/processor.h | 3 ++-
include/asm-s390/processor.h | 3 ++-
include/linux/sched.h | 4 ++++
6 files changed, 16 insertions(+), 4 deletions(-)
diff -puN include/asm-ia64/processor.h~maps4-rework-task_size-macros include/asm-ia64/processor.h
--- a/include/asm-ia64/processor.h~maps4-rework-task_size-macros
+++ a/include/asm-ia64/processor.h
@@ -31,7 +31,8 @@
* each (assuming 8KB page size), for a total of 8TB of user virtual
* address space.
*/
-#define TASK_SIZE (current->thread.task_size)
+#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size)
+#define TASK_SIZE TASK_SIZE_OF(current)
/*
* This decides where the kernel will search for a free chunk of vm
diff -puN include/asm-mips/processor.h~maps4-rework-task_size-macros include/asm-mips/processor.h
--- a/include/asm-mips/processor.h~maps4-rework-task_size-macros
+++ a/include/asm-mips/processor.h
@@ -45,6 +45,8 @@ extern unsigned int vced_count, vcei_cou
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
+#define TASK_SIZE_OF(tsk) \
+ (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
#endif
#ifdef CONFIG_64BIT
@@ -65,6 +67,8 @@ extern unsigned int vced_count, vcei_cou
#define TASK_UNMAPPED_BASE \
(test_thread_flag(TIF_32BIT_ADDR) ? \
PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
+#define TASK_SIZE_OF(tsk) \
+ (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
#endif
#define NUM_FPU_REGS 32
diff -puN include/asm-parisc/processor.h~maps4-rework-task_size-macros include/asm-parisc/processor.h
--- a/include/asm-parisc/processor.h~maps4-rework-task_size-macros
+++ a/include/asm-parisc/processor.h
@@ -32,7 +32,8 @@
#endif
#define current_text_addr() ({ void *pc; current_ia(pc); pc; })
-#define TASK_SIZE (current->thread.task_size)
+#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size)
+#define TASK_SIZE TASK_SIZE_OF(current)
#define TASK_UNMAPPED_BASE (current->thread.map_base)
#define DEFAULT_TASK_SIZE32 (0xFFF00000UL)
diff -puN include/asm-powerpc/processor.h~maps4-rework-task_size-macros include/asm-powerpc/processor.h
--- a/include/asm-powerpc/processor.h~maps4-rework-task_size-macros
+++ a/include/asm-powerpc/processor.h
@@ -99,8 +99,9 @@ extern struct task_struct *last_task_use
*/
#define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
-#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
+#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, 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 -puN include/asm-s390/processor.h~maps4-rework-task_size-macros include/asm-s390/processor.h
--- a/include/asm-s390/processor.h~maps4-rework-task_size-macros
+++ a/include/asm-s390/processor.h
@@ -73,8 +73,9 @@ extern struct task_struct *last_task_use
#else /* __s390x__ */
-# define TASK_SIZE (test_thread_flag(TIF_31BIT) ? \
+# define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_31BIT) ? \
(0x80000000UL) : (0x40000000000UL))
+# define TASK_SIZE TASK_SIZE_OF(current)
# define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
# define DEFAULT_TASK_SIZE (0x40000000000UL)
diff -puN include/linux/sched.h~maps4-rework-task_size-macros include/linux/sched.h
--- a/include/linux/sched.h~maps4-rework-task_size-macros
+++ a/include/linux/sched.h
@@ -1986,6 +1986,10 @@ static inline void inc_syscw(struct task
}
#endif
+#ifndef TASK_SIZE_OF
+#define TASK_SIZE_OF(tsk) TASK_SIZE
+#endif
+
#endif /* __KERNEL__ */
#endif
_
Patches currently in -mm which might be from haveblue@xxxxxxxxxx are
maps4-add-proportional-set-size-accounting-in-smaps.patch
maps4-rework-task_size-macros.patch
maps4-move-is_swap_pte.patch
maps4-introduce-a-generic-page-walker.patch
maps4-use-pagewalker-in-clear_refs-and-smaps.patch
maps4-simplify-interdependence-of-maps-and-smaps.patch
maps4-move-clear_refs-code-to-task_mmuc.patch
maps4-regroup-task_mmu-by-interface.patch
maps4-add-proc-pid-pagemap-interface.patch
maps4-add-proc-kpagecount-interface.patch
maps4-add-proc-kpageflags-interface.patch
maps4-make-page-monitoring-proc-file-optional.patch
r-o-bind-mounts-stub-functions.patch
r-o-bind-mounts-elevate-write-count-opend-files.patch
r-o-bind-mounts-elevate-write-count-for-some-ioctls.patch
ext2-reservations-fix-for-r-o-bind-mounts-take-writer-count-v2.patch
r-o-bind-mounts-elevate-writer-count-for-chown-and-friends.patch
r-o-bind-mounts-make-access-use-mnt-check.patch
r-o-bind-mounts-elevate-mnt-writers-for-callers-of-vfs_mkdir.patch
r-o-bind-mounts-elevate-write-count-during-entire-ncp_ioctl.patch
r-o-bind-mounts-elevate-write-count-during-entire-ncp_ioctl-fix.patch
r-o-bind-mounts-elevate-write-count-for-link-and-symlink-calls.patch
r-o-bind-mounts-elevate-mount-count-for-extended-attributes.patch
r-o-bind-mounts-elevate-write-count-for-file_update_time.patch
r-o-bind-mounts-unix_find_other-elevate-write-count-for-touch_atime.patch
r-o-bind-mounts-unix_find_other-elevate-write-count-for-touch_atime-fix.patch
r-o-bind-mounts-elevate-write-count-over-calls-to-vfs_rename.patch
r-o-bind-mounts-nfs-check-mnt-instead-of-superblock-directly.patch
r-o-bind-mounts-elevate-writer-count-for-do_sys_truncate.patch
r-o-bind-mounts-elevate-write-count-for-do_utimes.patch
r-o-bind-mounts-elevate-write-count-for-do_utimes-touch-command-causes-oops.patch
r-o-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime.patch
r-o-bind-mounts-sys_mknodat-elevate-write-count-for-vfs_mknod-create.patch
r-o-bind-mounts-sys_mknodat-elevate-write-count-for-vfs_mknod-create-fix.patch
r-o-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers.patch
r-o-bind-mounts-do_rmdir-elevate-write-count.patch
r-o-bind-mounts-track-number-of-mount-writers.patch
r-o-bind-mounts-track-number-of-mount-writers-make-lockdep-happy-with-r-o-bind-mounts.patch
r-o-bind-mounts-track-number-of-mount-writers-fix.patch
r-o-bind-mounts-honor-r-w-changes-at-do_remount-time.patch
reiser4.patch
page-owner-tracking-leak-detector.patch
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