diff options
Diffstat (limited to 'drivers/staging/media/atomisp/pci/hive_isp_css_include/assert_support.h')
| -rw-r--r-- | drivers/staging/media/atomisp/pci/hive_isp_css_include/assert_support.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/staging/media/atomisp/pci/hive_isp_css_include/assert_support.h b/drivers/staging/media/atomisp/pci/hive_isp_css_include/assert_support.h new file mode 100644 index 000000000000..4cb7e4c952c5 --- /dev/null +++ b/drivers/staging/media/atomisp/pci/hive_isp_css_include/assert_support.h @@ -0,0 +1,73 @@ +/* + * Support for Intel Camera Imaging ISP subsystem. + * Copyright (c) 2015, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#ifndef __ASSERT_SUPPORT_H_INCLUDED__ +#define __ASSERT_SUPPORT_H_INCLUDED__ + +/** + * The following macro can help to test the size of a struct at compile + * time rather than at run-time. It does not work for all compilers; see + * below. + * + * Depending on the value of 'condition', the following macro is expanded to: + * - condition==true: + * an expression containing an array declaration with negative size, + * usually resulting in a compilation error + * - condition==false: + * (void) 1; // C statement with no effect + * + * example: + * COMPILATION_ERROR_IF( sizeof(struct host_sp_queues) != SIZE_OF_HOST_SP_QUEUES_STRUCT); + * + * verify that the macro indeed triggers a compilation error with your compiler: + * COMPILATION_ERROR_IF( sizeof(struct host_sp_queues) != (sizeof(struct host_sp_queues)+1) ); + * + * Not all compilers will trigger an error with this macro; use a search engine to search for + * BUILD_BUG_ON to find other methods. + */ +#define COMPILATION_ERROR_IF(condition) ((void)sizeof(char[1 - 2 * !!(condition)])) + +/* Compile time assertion */ +#ifndef CT_ASSERT +#define CT_ASSERT(cnd) ((void)sizeof(char[(cnd) ? 1 : -1])) +#endif /* CT_ASSERT */ + +#include <linux/bug.h> + +/* TODO: it would be cleaner to use this: + * #define assert(cnd) BUG_ON(cnd) + * but that causes many compiler warnings (==errors) under Android + * because it seems that the BUG_ON() macro is not seen as a check by + * gcc like the BUG() macro is. */ +#define assert(cnd) \ + do { \ + if (!(cnd)) \ + BUG(); \ + } while (0) + +#ifndef PIPE_GENERATION +/* Deprecated OP___assert, this is still used in ~1000 places + * in the code. This will be removed over time. + * The implementation for the pipe generation tool is in see support.isp.h */ +#define OP___assert(cnd) assert(cnd) + +static inline void compile_time_assert(unsigned int cond) +{ + /* Call undefined function if cond is false */ + void _compile_time_assert(void); + if (!cond) _compile_time_assert(); +} +#endif /* PIPE_GENERATION */ + +#endif /* __ASSERT_SUPPORT_H_INCLUDED__ */ |