| 1 | // RUN: %check_clang_tidy %s linuxkernel-must-check-errs %t |
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| 2 | |
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| 3 | #define __must_check __attribute__((warn_unused_result)) |
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| 4 | |
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| 5 | // Prototypes of the error functions. |
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| 6 | void * __must_check ERR_PTR(long error); |
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| 7 | long __must_check PTR_ERR(const void *ptr); |
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| 8 | int __must_check IS_ERR(const void *ptr); |
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| 9 | int __must_check IS_ERR_OR_NULL(const void *ptr); |
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| 10 | void * __must_check ERR_CAST(const void *ptr); |
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| 11 | int __must_check PTR_ERR_OR_ZERO(const void *ptr); |
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| 12 | |
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| 13 | void f(void) { |
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| 14 | ERR_PTR(error: 0); |
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| 15 | // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: result from function 'ERR_PTR' is unused |
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| 16 | PTR_ERR(ptr: (void *)0); |
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| 17 | // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: result from function 'PTR_ERR' is unused |
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| 18 | IS_ERR(ptr: (void *)0); |
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| 19 | // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: result from function 'IS_ERR' is unused |
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| 20 | ERR_CAST(ptr: (void *)0); |
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| 21 | // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: result from function 'ERR_CAST' is unused |
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| 22 | out: |
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| 23 | PTR_ERR_OR_ZERO(ptr: (void *)0); |
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| 24 | // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: result from function 'PTR_ERR_OR_ZERO' is unused |
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| 25 | } |
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| 26 | |
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| 27 | void *f1(void) { |
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| 28 | return ERR_PTR(error: 0); |
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| 29 | } |
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| 30 | |
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| 31 | long f2(void) { |
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| 32 | if (IS_ERR(ptr: (void *)0)) { |
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| 33 | return PTR_ERR(ptr: (void *)0); |
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| 34 | } |
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| 35 | return -1; |
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| 36 | } |
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| 37 | |
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| 38 | void f3(void) { |
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| 39 | f1(); |
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| 40 | // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: result from function 'f1' is unused but represents an error value |
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| 41 | f2(); |
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| 42 | // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: result from function 'f2' is unused but represents an error value |
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| 43 | } |
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| 44 | |
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