drm/i915/selftests: Allocate inode/file dynamically

Avoid having too large a stack by creating the fake struct inode/file on
the heap instead.

drivers/gpu/drm/i915/selftests/mock_drm.c: In function 'mock_file':
drivers/gpu/drm/i915/selftests/mock_drm.c:46:1: error: the frame size of 1328 bytes is larger than 1280 bytes [-Werror=frame-larger-than=]
drivers/gpu/drm/i915/selftests/mock_drm.c: In function 'mock_file_free':
drivers/gpu/drm/i915/selftests/mock_drm.c:54:1: error: the frame size of 1312 bytes is larger than 1280 bytes [-Werror=frame-larger-than=]

Reported-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 66d9cb5d805a ("drm/i915: Mock the GEM device for self-testing")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20170419094143.16922-2-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
(cherry picked from commit 2310b3c952c5dc56c2e08f71b907b8e23ab3270d)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/selftests/mock_drm.c b/drivers/gpu/drm/i915/selftests/mock_drm.c
index 113dec05c7dcf5a53be9e9fb660e5d23b94dcc6a..09c7041534568f0193f257a9251c155731c02bcd 100644 (file)
--- a/drivers/gpu/drm/i915/selftests/mock_drm.c
+++ b/drivers/gpu/drm/i915/selftests/mock_drm.c
@@ -24,31 +24,50 @@
 
 #include "mock_drm.h"
 
-static inline struct inode fake_inode(struct drm_i915_private *i915)
-{
-       return (struct inode){ .i_rdev = i915->drm.primary->index };
-}
-
 struct drm_file *mock_file(struct drm_i915_private *i915)
 {
-       struct inode inode = fake_inode(i915);
-       struct file filp = {};
+       struct file *filp;
+       struct inode *inode;
        struct drm_file *file;
        int err;
 
-       err = drm_open(&inode, &filp);
-       if (unlikely(err))
-               return ERR_PTR(err);
+       inode = kzalloc(sizeof(*inode), GFP_KERNEL);
+       if (!inode) {
+               err = -ENOMEM;
+               goto err;
+       }
+
+       inode->i_rdev = i915->drm.primary->index;
 
-       file = filp.private_data;
+       filp = kzalloc(sizeof(*filp), GFP_KERNEL);
+       if (!filp) {
+               err = -ENOMEM;
+               goto err_inode;
+       }
+
+       err = drm_open(inode, filp);
+       if (err)
+               goto err_filp;
+
+       file = filp->private_data;
+       memset(&file->filp, POISON_INUSE, sizeof(file->filp));
        file->authenticated = true;
+
+       kfree(filp);
+       kfree(inode);
        return file;
+
+err_filp:
+       kfree(filp);
+err_inode:
+       kfree(inode);
+err:
+       return ERR_PTR(err);
 }
 
 void mock_file_free(struct drm_i915_private *i915, struct drm_file *file)
 {
-       struct inode inode = fake_inode(i915);
        struct file filp = { .private_data = file };
 
-       drm_release(&inode, &filp);
+       drm_release(NULL, &filp);
 }