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authorVille Syrjälä <ville.syrjala@linux.intel.com>2012-12-12 13:34:03 +0200
committerH. Peter Anvin <hpa@linux.intel.com>2013-02-07 15:07:28 -0800
commit96477b4cd705c5416346aef262b0a1116cfcdd80 (patch)
treefcc031d7eb37e0eeef361e65102c260c8b62490b /arch/x86/kernel/i386_ksyms_32.c
parent07f4207a305c834f528d08428df4531744e25678 (diff)
x86-32: Add support for 64bit get_user()
Implement __get_user_8() for x86-32. It will return the 64-bit result in edx:eax register pair, and ecx is used to pass in the address and return the error value. For consistency, change the register assignment for all other __get_user_x() variants, so that address is passed in ecx/rcx, the error value is returned in ecx/rcx, and eax/rax contains the actual value. [ hpa: I modified the patch so that it does NOT change the calling conventions for the existing callsites, this also means that the code is completely unchanged for 64 bits. Instead, continue to use eax for address input/error output and use the ecx:edx register pair for the output. ] This is a partial refresh of a patch [1] by Jamie Lokier from 2004. Only the minimal changes to implement 64bit get_user() were picked from the original patch. [1] http://article.gmane.org/gmane.linux.kernel/198823 Originally-by: Jamie Lokier <jamie@shareable.org> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://lkml.kernel.org/r/1355312043-11467-1-git-send-email-ville.syrjala@linux.intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/i386_ksyms_32.c')
-rw-r--r--arch/x86/kernel/i386_ksyms_32.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kernel/i386_ksyms_32.c b/arch/x86/kernel/i386_ksyms_32.c
index 9c3bd4a2050e..0fa69127209a 100644
--- a/arch/x86/kernel/i386_ksyms_32.c
+++ b/arch/x86/kernel/i386_ksyms_32.c
@@ -26,6 +26,7 @@ EXPORT_SYMBOL(csum_partial_copy_generic);
EXPORT_SYMBOL(__get_user_1);
EXPORT_SYMBOL(__get_user_2);
EXPORT_SYMBOL(__get_user_4);
+EXPORT_SYMBOL(__get_user_8);
EXPORT_SYMBOL(__put_user_1);
EXPORT_SYMBOL(__put_user_2);