tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
coding style cleanups for drivers/md/mktables.c
Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>
Cc: Neil Brown <neilb@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
authored by
Oliver Pinter
and committed by
Linus Torvalds
54212cf4
91c43132
+83
-79
+83
-79
drivers/md/mktables.c
+83
-79
drivers/md/mktables.c
···
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static uint8_t gfmul(uint8_t a, uint8_t b)
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{
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uint8_t v = 0;
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uint8_t v = 0;
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while ( b ) {
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if ( b & 1 ) v ^= a;
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a = (a << 1) ^ (a & 0x80 ? 0x1d : 0);
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b >>= 1;
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}
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return v;
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while (b) {
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if (b & 1)
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v ^= a;
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a = (a << 1) ^ (a & 0x80 ? 0x1d : 0);
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b >>= 1;
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}
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return v;
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}
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static uint8_t gfpow(uint8_t a, int b)
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{
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uint8_t v = 1;
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uint8_t v = 1;
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b %= 255;
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if ( b < 0 )
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b += 255;
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b %= 255;
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if (b < 0)
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b += 255;
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while ( b ) {
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if ( b & 1 ) v = gfmul(v,a);
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a = gfmul(a,a);
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b >>= 1;
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}
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return v;
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while (b) {
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if (b & 1)
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v = gfmul(v, a);
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a = gfmul(a, a);
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b >>= 1;
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}
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return v;
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}
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int main(int argc, char *argv[])
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{
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int i, j, k;
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uint8_t v;
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uint8_t exptbl[256], invtbl[256];
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int i, j, k;
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uint8_t v;
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uint8_t exptbl[256], invtbl[256];
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printf("#include \"raid6.h\"\n");
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printf("#include \"raid6.h\"\n");
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/* Compute multiplication table */
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_gfmul[256][256] =\n"
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"{\n");
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for ( i = 0 ; i < 256 ; i++ ) {
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printf("\t{\n");
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for ( j = 0 ; j < 256 ; j += 8 ) {
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printf("\t\t");
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for ( k = 0 ; k < 8 ; k++ ) {
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printf("0x%02x, ", gfmul(i,j+k));
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}
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printf("\n");
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}
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printf("\t},\n");
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}
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printf("};\n");
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/* Compute multiplication table */
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_gfmul[256][256] =\n"
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"{\n");
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for (i = 0; i < 256; i++) {
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printf("\t{\n");
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for (j = 0; j < 256; j += 8) {
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printf("\t\t");
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for (k = 0; k < 8; k++)
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printf("0x%02x, ", gfmul(i, j+k));
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printf("\n");
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}
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printf("\t},\n");
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}
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printf("};\n");
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/* Compute power-of-2 table (exponent) */
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v = 1;
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_gfexp[256] =\n"
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"{\n");
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for ( i = 0 ; i < 256 ; i += 8 ) {
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printf("\t");
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for ( j = 0 ; j < 8 ; j++ ) {
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exptbl[i+j] = v;
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printf("0x%02x, ", v);
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v = gfmul(v,2);
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if ( v == 1 ) v = 0; /* For entry 255, not a real entry */
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}
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printf("\n");
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}
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printf("};\n");
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/* Compute power-of-2 table (exponent) */
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v = 1;
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_gfexp[256] =\n"
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"{\n");
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for (i = 0; i < 256; i += 8) {
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printf("\t");
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for (j = 0; j < 8; j++) {
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exptbl[i+j] = v;
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printf("0x%02x, ", v);
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v = gfmul(v, 2);
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if (v == 1)
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v = 0; /* For entry 255, not a real entry */
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}
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printf("\n");
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}
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printf("};\n");
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/* Compute inverse table x^-1 == x^254 */
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_gfinv[256] =\n"
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"{\n");
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for ( i = 0 ; i < 256 ; i += 8 ) {
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printf("\t");
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for ( j = 0 ; j < 8 ; j++ ) {
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invtbl[i+j] = v = gfpow(i+j,254);
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printf("0x%02x, ", v);
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}
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printf("\n");
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}
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printf("};\n");
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/* Compute inverse table x^-1 == x^254 */
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_gfinv[256] =\n"
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"{\n");
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for (i = 0; i < 256; i += 8) {
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printf("\t");
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for (j = 0; j < 8; j++) {
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v = gfpow(i+j, 254);
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invtbl[i+j] = v;
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printf("0x%02x, ", v);
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}
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printf("\n");
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}
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printf("};\n");
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/* Compute inv(2^x + 1) (exponent-xor-inverse) table */
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_gfexi[256] =\n"
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"{\n");
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for ( i = 0 ; i < 256 ; i += 8 ) {
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printf("\t");
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for ( j = 0 ; j < 8 ; j++ ) {
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printf("0x%02x, ", invtbl[exptbl[i+j]^1]);
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}
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printf("\n");
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}
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printf("};\n\n");
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/* Compute inv(2^x + 1) (exponent-xor-inverse) table */
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_gfexi[256] =\n"
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"{\n");
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for (i = 0; i < 256; i += 8) {
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printf("\t");
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for (j = 0; j < 8; j++)
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printf("0x%02x, ", invtbl[exptbl[i+j]^1]);
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printf("\n");
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}
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printf("};\n\n");
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return 0;
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return 0;
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}