Re: [PATCH 1/4] crypto: crc32: Drop CONFIG_DYNAMIC_CRC_TABLE option

[Johannes Zink <j.zink@pengutronix.de>]

Even though I am too late: tested and verified entire series on ARM64

Tested-by: Johannes Zink <j.zink@pengutronix.de>


On 9/4/23 10:18, Sascha Hauer wrote:
> Generating the crc table on a not-so-powerfull i.MX6q SoC takes
> around 100us. This is negligible and not worth bothering the user with
> an extra Kconfig option. Just drop the option and make it the default.
> 
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> ---
>   common/Kconfig |  9 -------
>   crypto/crc32.c | 66 --------------------------------------------------
>   2 files changed, 75 deletions(-)
> 
> diff --git a/common/Kconfig b/common/Kconfig
> index 50f62b9f9a..afa591cb76 100644
> --- a/common/Kconfig
> +++ b/common/Kconfig
> @@ -519,15 +519,6 @@ endchoice
>   
>   endif
>   
> -config DYNAMIC_CRC_TABLE
> -	bool
> -	depends on CRC32
> -	prompt "Generate the crc32 table dynamically"
> -	default y
> -	help
> -	  Saying yes to this option saves around 800 bytes of binary size.
> -	  If unsure say yes.
> -
>   config ERRNO_MESSAGES
>   	bool
>   	prompt "print error values as text"
> diff --git a/crypto/crc32.c b/crypto/crc32.c
> index 95cb2212db..ff5c429ad1 100644
> --- a/crypto/crc32.c
> +++ b/crypto/crc32.c
> @@ -22,8 +22,6 @@
>   #define STATIC static inline
>   #endif
>   
> -#ifdef CONFIG_DYNAMIC_CRC_TABLE
> -
>   static uint32_t *crc_table;
>   
>   /*
> @@ -73,66 +71,6 @@ static void make_crc_table(void)
>       crc_table[n] = c;
>     }
>   }
> -#else
> -/* ========================================================================
> - * Table of CRC-32's of all single-byte values (made by make_crc_table)
> - */
> -static const uint32_t crc_table[256] = {
> -  0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
> -  0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
> -  0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
> -  0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
> -  0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
> -  0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
> -  0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
> -  0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
> -  0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
> -  0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
> -  0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
> -  0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
> -  0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
> -  0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
> -  0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
> -  0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
> -  0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
> -  0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
> -  0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
> -  0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
> -  0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
> -  0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
> -  0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
> -  0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
> -  0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
> -  0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
> -  0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
> -  0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
> -  0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
> -  0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
> -  0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
> -  0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
> -  0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
> -  0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
> -  0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
> -  0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
> -  0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
> -  0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
> -  0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
> -  0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
> -  0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
> -  0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
> -  0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
> -  0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
> -  0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
> -  0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
> -  0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
> -  0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
> -  0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
> -  0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
> -  0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
> -  0x2d02ef8dL
> -};
> -#endif
> -
>   
>   /* ========================================================================= */
>   #define DO1(buf) crc = crc_table[((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8);
> @@ -145,10 +83,8 @@ STATIC uint32_t crc32(uint32_t crc, const void *_buf, unsigned int len)
>   {
>       const unsigned char *buf = _buf;
>   
> -#ifdef CONFIG_DYNAMIC_CRC_TABLE
>   	if (!crc_table)
>   		make_crc_table();
> -#endif
>       crc = crc ^ 0xffffffffL;
>       while (len >= 8)
>       {
> @@ -171,10 +107,8 @@ STATIC uint32_t crc32_no_comp(uint32_t crc, const void *_buf, unsigned int len)
>   {
>      const unsigned char *buf = _buf;
>   
> -#ifdef CONFIG_DYNAMIC_CRC_TABLE
>   	if (!crc_table)
>   		make_crc_table();
> -#endif
>       while (len >= 8)
>       {
>         DO8(buf);

-- 
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