[PATCH] sys_move_pages: 32bit support (i386, x86_64)

sys_move_pages() support for 32bit (i386 plus x86_64 compat layer)

Add support for move_pages() on i386 and also add the compat functions
necessary to run 32 bit binaries on x86_64.

Add compat_sys_move_pages to the x86_64 32bit binary layer.  Note that it is
not up to date so I added the missing pieces.  Not sure if this is done the
right way.

[akpm@osdl.org: compile fix]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/i386/kernel/syscall_table.S b/arch/i386/kernel/syscall_table.S
index af56987..dd63d47 100644 (file)
--- a/arch/i386/kernel/syscall_table.S
+++ b/arch/i386/kernel/syscall_table.S
@@ -316,3 +316,4 @@ ENTRY(sys_call_table)
        .long sys_sync_file_range
        .long sys_tee                   /* 315 */
        .long sys_vmsplice
+       .long sys_move_pages

diff --git a/arch/x86_64/ia32/ia32entry.S b/arch/x86_64/ia32/ia32entry.S
index 5a92fed..4ec594a 100644 (file)
--- a/arch/x86_64/ia32/ia32entry.S
+++ b/arch/x86_64/ia32/ia32entry.S
@@ -696,4 +696,5 @@ ia32_sys_call_table:
        .quad sys_sync_file_range
        .quad sys_tee
        .quad compat_sys_vmsplice
+       .quad compat_sys_move_pages
 ia32_syscall_end:              

diff --git a/include/asm-i386/unistd.h b/include/asm-i386/unistd.h
index de2ccc1..fc1c8dd 100644 (file)
--- a/include/asm-i386/unistd.h
+++ b/include/asm-i386/unistd.h
@@ -322,10 +322,11 @@
 #define __NR_sync_file_range   314
 #define __NR_tee               315
 #define __NR_vmsplice          316
+#define __NR_move_pages                317
 
 #ifdef __KERNEL__
 
-#define NR_syscalls 317
+#define NR_syscalls 318
 
 /*
  * user-visible error numbers are in the range -1 - -128: see

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 7e3f234..e42738c 100644 (file)
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -521,6 +521,11 @@ asmlinkage long sys_move_pages(pid_t pid, unsigned long nr_pages,
                                const int __user *nodes,
                                int __user *status,
                                int flags);
+asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_page,
+                               void __user *pages,
+                               const int __user *nodes,
+                               int __user *status,
+                               int flags);
 asmlinkage long sys_mbind(unsigned long start, unsigned long len,
                                unsigned long mode,
                                unsigned long __user *nmask,

diff --git a/kernel/compat.c b/kernel/compat.c
index c1601a8..ccea93e 100644 (file)
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -21,6 +21,7 @@
 #include <linux/unistd.h>
 #include <linux/security.h>
 #include <linux/timex.h>
+#include <linux/migrate.h>
 
 #include <asm/uaccess.h>
 
@@ -934,3 +935,25 @@ asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
 
        return ret;
 }
+
+#ifdef CONFIG_NUMA
+asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
+               void __user *pages32,
+               const int __user *nodes,
+               int __user *status,
+               int flags)
+{
+       const void __user * __user *pages;
+       int i;
+
+       pages = compat_alloc_user_space(nr_pages * sizeof(void *));
+       for (i = 0; i < nr_pages; i++) {
+               compat_uptr_t p;
+
+               if (get_user(p, (compat_uptr_t *)(pages32 + i)) ||
+                       put_user(compat_ptr(p), pages + i))
+                       return -EFAULT;
+       }
+       return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
+}
+#endif

diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 5972297..6991bec 100644 (file)
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -133,3 +133,4 @@ cond_syscall(sys_mincore);
 cond_syscall(sys_madvise);
 cond_syscall(sys_mremap);
 cond_syscall(sys_remap_file_pages);
+cond_syscall(compat_sys_move_pages);