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authorDavid Woodhouse <dwmw2@infradead.org>2007-06-16 10:48:19 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-16 09:39:05 -0700
commitf4d2781731e846c2f01dd85e71883d120860c6dd (patch)
treeaac469bb1017619d0c314b6efcbbb465196237d6
parentde7f928ca460005086a8296be07c217aac4b625d (diff)
downloadlinux-f4d2781731e846c2f01dd85e71883d120860c6dd.tar.gz
fix radeon setparam on 32/64 systems, harder.
Commit 9b01bd5b284bbf519b726b39f1352023cb5e9e69 introduced a compat_ioctl handler for RADEON_SETPARAM, the sole purpose of which was to handle the fact that on i386, alignof(uint64_t)==4. Unfortunately, this handler was installed for _all_ 64-bit architectures, instead of only x86_64 and ia64. And thus it breaks 32-bit compatibility on every other arch, where 64-bit integers are aligned to 8 bytes in 32-bit mode just the same as in 64-bit mode. Arnd has a cunning plan to use 'compat_u64' with appropriate alignment attributes according to the 32-bit ABI, but for now let's just make the compat_radeon_cp_setparam routine entirely disappear on 64-bit machines whose 32-bit compat support isn't for i386. It would be a no-op with compat_u64 anyway. Signed-off-by: David Woodhouse <dwmw2@infradead.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Dave Airlie <airlied@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/char/drm/radeon_ioc32.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/char/drm/radeon_ioc32.c b/drivers/char/drm/radeon_ioc32.c
index 04126c2e79a..56decda2a71 100644
--- a/drivers/char/drm/radeon_ioc32.c
+++ b/drivers/char/drm/radeon_ioc32.c
@@ -349,6 +349,8 @@ static int compat_radeon_irq_emit(struct file *file, unsigned int cmd,
DRM_IOCTL_RADEON_IRQ_EMIT, (unsigned long)request);
}
+/* The two 64-bit arches where alignof(u64)==4 in 32-bit code */
+#if defined (CONFIG_X86_64) || defined(CONFIG_IA64)
typedef struct drm_radeon_setparam32 {
int param;
u64 value;
@@ -373,6 +375,9 @@ static int compat_radeon_cp_setparam(struct file *file, unsigned int cmd,
return drm_ioctl(file->f_dentry->d_inode, file,
DRM_IOCTL_RADEON_SETPARAM, (unsigned long) request);
}
+#else
+#define compat_radeon_cp_setparam NULL
+#endif /* X86_64 || IA64 */
drm_ioctl_compat_t *radeon_compat_ioctls[] = {
[DRM_RADEON_CP_INIT] = compat_radeon_cp_init,