OpenWrt – Blame information for rev 4
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Rev | Author | Line No. | Line |
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4 | office | 1 | From: Hans de Goede <hdegoede@redhat.com> |
2 | Date: Sat, 7 Feb 2015 21:52:40 +0000 (+0100) |
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3 | Subject: Add linux/compiler-gcc5.h to fix builds with gcc5 |
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4 | X-Git-Tag: v2015.04-rc2~31 |
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5 | X-Git-Url: http://git.denx.de/?p=u-boot.git;a=commitdiff_plain;h=478b02f1a7043b673565075ea5016376f3293b23 |
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6 | |||
7 | Add linux/compiler-gcc5.h to fix builds with gcc5 |
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8 | |||
9 | Add linux/compiler-gcc5/h from the kernel sources at: |
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10 | |||
11 | commit 5631b8fba640a4ab2f8a954f63a603fa34eda96b |
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12 | Author: Steven Noonan <steven@uplinklabs.net> |
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13 | Date: Sat Oct 25 15:09:42 2014 -0700 |
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14 | |||
15 | compiler/gcc4+: Remove inaccurate comment about 'asm goto' miscompiles |
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16 | |||
17 | Signed-off-by: Hans de Goede <hdegoede@redhat.com> |
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18 | --- |
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19 | |||
20 | --- /dev/null |
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21 | +++ b/include/linux/compiler-gcc5.h |
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22 | @@ -0,0 +1,65 @@ |
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23 | +#ifndef __LINUX_COMPILER_H |
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24 | +#error "Please don't include <linux/compiler-gcc5.h> directly, include <linux/compiler.h> instead." |
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25 | +#endif |
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26 | + |
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27 | +#define __used __attribute__((__used__)) |
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28 | +#define __must_check __attribute__((warn_unused_result)) |
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29 | +#define __compiler_offsetof(a, b) __builtin_offsetof(a, b) |
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30 | + |
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31 | +/* Mark functions as cold. gcc will assume any path leading to a call |
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32 | + to them will be unlikely. This means a lot of manual unlikely()s |
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33 | + are unnecessary now for any paths leading to the usual suspects |
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34 | + like BUG(), printk(), panic() etc. [but let's keep them for now for |
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35 | + older compilers] |
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36 | + |
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37 | + Early snapshots of gcc 4.3 don't support this and we can't detect this |
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38 | + in the preprocessor, but we can live with this because they're unreleased. |
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39 | + Maketime probing would be overkill here. |
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40 | + |
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41 | + gcc also has a __attribute__((__hot__)) to move hot functions into |
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42 | + a special section, but I don't see any sense in this right now in |
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43 | + the kernel context */ |
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44 | +#define __cold __attribute__((__cold__)) |
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45 | + |
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46 | +#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) |
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47 | + |
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48 | +#ifndef __CHECKER__ |
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49 | +# define __compiletime_warning(message) __attribute__((warning(message))) |
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50 | +# define __compiletime_error(message) __attribute__((error(message))) |
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51 | +#endif /* __CHECKER__ */ |
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52 | + |
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53 | +/* |
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54 | + * Mark a position in code as unreachable. This can be used to |
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55 | + * suppress control flow warnings after asm blocks that transfer |
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56 | + * control elsewhere. |
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57 | + * |
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58 | + * Early snapshots of gcc 4.5 don't support this and we can't detect |
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59 | + * this in the preprocessor, but we can live with this because they're |
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60 | + * unreleased. Really, we need to have autoconf for the kernel. |
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61 | + */ |
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62 | +#define unreachable() __builtin_unreachable() |
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63 | + |
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64 | +/* Mark a function definition as prohibited from being cloned. */ |
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65 | +#define __noclone __attribute__((__noclone__)) |
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66 | + |
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67 | +/* |
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68 | + * Tell the optimizer that something else uses this function or variable. |
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69 | + */ |
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70 | +#define __visible __attribute__((externally_visible)) |
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71 | + |
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72 | +/* |
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73 | + * GCC 'asm goto' miscompiles certain code sequences: |
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74 | + * |
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75 | + * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 |
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76 | + * |
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77 | + * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. |
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78 | + * |
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79 | + * (asm goto is automatically volatile - the naming reflects this.) |
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80 | + */ |
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81 | +#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) |
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82 | + |
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83 | +#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP |
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84 | +#define __HAVE_BUILTIN_BSWAP32__ |
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85 | +#define __HAVE_BUILTIN_BSWAP64__ |
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86 | +#define __HAVE_BUILTIN_BSWAP16__ |
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87 | +#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ |