Currently, 'unsigned long' is used for intermediate variables when calculating CRCs. The size of 'long' differs depending on the architecture: it is 32 bits on 32-bit architectures and 64 bits on 64-bit architectures. The CRC values generated by genksyms represent the compatibility of exported symbols. Therefore, reproducibility is important. In other words, we need to ensure that the output is the same when the kernel source is identical, regardless of whether genksyms is running on a 32-bit or 64-bit build machine. Fortunately, the output from genksyms is not affected by the build machine's architecture because only the lower 32 bits of the 'unsigned long' variables are used. To make it even clearer that the CRC calculation is independent of the build machine's architecture, this commit explicitly uses the fixed-width type, uint32_t.
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| @@ -12,6 +12,7 @@ · 11 unmodified lines | ||
| 12 | 12 | |
| 13 | 13 | #include <stdio.h> |
| 14 | 14 | #include <string.h> |
| 15 | +#include <stdint.h> | |
| 15 | 16 | #include <stdlib.h> |
| 16 | 17 | #include <unistd.h> |
| 17 | 18 | #include <assert.h> |
| @@ -60,7 +61,7 @@ static void print_type_name(enum symbol_type type, const char *name); · 42 unmodified lines | ||
| 60 | 61 | |
| 61 | 62 | /*----------------------------------------------------------------------*/ |
| 62 | 63 | |
| 63 | −static const unsigned int crctab32[] = { | |
| 64 | +static const uint32_t crctab32[] = { | |
| 64 | 65 | 0x00000000U, 0x77073096U, 0xee0e612cU, 0x990951baU, 0x076dc419U, |
| 65 | 66 | 0x706af48fU, 0xe963a535U, 0x9e6495a3U, 0x0edb8832U, 0x79dcb8a4U, |
| 66 | 67 | 0xe0d5e91eU, 0x97d2d988U, 0x09b64c2bU, 0x7eb17cbdU, 0xe7b82d07U, |
| @@ -115,19 +116,19 @@ static const unsigned int crctab32[] = { · 48 unmodified lines | ||
| 115 | 116 | 0x2d02ef8dU |
| 116 | 117 | }; |
| 117 | 118 | |
| 118 | −static unsigned long partial_crc32_one(unsigned char c, unsigned long crc) | |
| 119 | +static uint32_t partial_crc32_one(uint8_t c, uint32_t crc) | |
| 119 | 120 | { |
| 120 | 121 | return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8); |
| 121 | 122 | } |
| 122 | 123 | |
| 123 | −static unsigned long partial_crc32(const char *s, unsigned long crc) | |
| 124 | +static uint32_t partial_crc32(const char *s, uint32_t crc) | |
| 124 | 125 | { |
| 125 | 126 | while (*s) |
| 126 | 127 | crc = partial_crc32_one(*s++, crc); |
| 127 | 128 | return crc; |
| 128 | 129 | } |
| 129 | 130 | |
| 130 | −static unsigned long crc32(const char *s) | |
| 131 | +static uint32_t crc32(const char *s) | |
| 131 | 132 | { |
| 132 | 133 | return partial_crc32(s, 0xffffffff) ^ 0xffffffff; |
| 133 | 134 | } |
| @@ -517,7 +518,7 @@ static void print_list(FILE * f, struct string_list *list) · 383 unmodified lines | ||
| 517 | 518 | } |
| 518 | 519 | } |
| 519 | 520 | |
| 520 | −static unsigned long expand_and_crc_sym(struct symbol *sym, unsigned long crc) | |
| 521 | +static uint32_t expand_and_crc_sym(struct symbol *sym, uint32_t crc) | |
| 521 | 522 | { |
| 522 | 523 | struct string_list *list = sym->defn; |
| 523 | 524 | struct string_list **e, **b; |
| @@ -624,7 +625,7 @@ static unsigned long expand_and_crc_sym(struct symbol *sym, unsigned long crc) · 100 unmodified lines | ||
| 624 | 625 | void export_symbol(const char *name) |
| 625 | 626 | { |
| 626 | 627 | struct symbol *sym; |
| 627 | − unsigned long crc; | |
| 628 | + uint32_t crc; | |
| 628 | 629 | int has_changed = 0; |
| 629 | 630 | |
| 630 | 631 | sym = find_symbol(name, SYM_NORMAL, 0); |
| @@ -672,7 +673,7 @@ void export_symbol(const char *name) · 41 unmodified lines | ||
| 672 | 673 | if (flag_dump_defs) |
| 673 | 674 | fputs(">\n", debugfile); |
| 674 | 675 | |
| 675 | − printf("#SYMVER %s 0x%08lx\n", name, crc); | |
| 676 | + printf("#SYMVER %s 0x%08lx\n", name, (unsigned long)crc); | |
| 676 | 677 | } |
| 677 | 678 | |
| 678 | 679 | /*----------------------------------------------------------------------*/ |