From: Daniel Thompson Date: Thu, 10 Jul 2014 19:58:08 +0000 (+0100) Subject: ARM: 8091/2: add get_user() support for 8 byte types X-Git-Tag: omap-for-v3.17/fixes-against-rc2~160^2~2^2~13 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e38361d032f12f42ddc6d8e2028f6668da696d14;p=pandora-kernel.git ARM: 8091/2: add get_user() support for 8 byte types Recent contributions, including to DRM and binder, introduce 64-bit values in their interfaces. A common motivation for this is to allow the same ABI for 32- and 64-bit userspaces (and therefore also a shared ABI for 32/64 hybrid userspaces). Anyhow, the developers would like to avoid gotchas like having to use copy_from_user(). This feature is already implemented on x86-32 and the majority of other 32-bit architectures. The current list of get_user_8 hold out architectures are: arm, avr32, blackfin, m32r, metag, microblaze, mn10300, sh. Credit: My name sits rather uneasily at the top of this patch. The v1 and v2 versions of the patch were written by Rob Clark and to produce v4 I mostly copied code from Russell King and H. Peter Anvin. However I have mangled the patch sufficiently that *blame* is rightfully mine even if credit should more widely shared. Changelog: v5: updated to use the ret macro (requested by Russell King) v4: remove an inlined add on big endian systems (spotted by Russell King), used __ARMEB__ rather than BIG_ENDIAN (to match rest of file), cleared r3 on EFAULT during __get_user_8. v3: fix a couple of checkpatch issues v2: pass correct size to check_uaccess, and better handling of narrowing double word read with __get_user_xb() (Russell King's suggestion) v1: original Signed-off-by: Rob Clark Signed-off-by: Daniel Thompson Signed-off-by: Russell King --- Reading git-diff-tree failed