Even if CONFIG_DEBUG_VM=n gcc genereates code for some VM_BUG_ON() for example VM_BUG_ON(!PageCompound(page) || !PageHead(page)); in do_huge_pmd_wp_page() generates 114 bytes of code. But they mostly disappears when I split this VM_BUG_ON into two: -VM_BUG_ON(!PageCompound(page) || !PageHead(page)); +VM_BUG_ON(!PageCompound(page)); +VM_BUG_ON(!PageHead(page)); weird... but anyway after this patch code disappears completely. add/remove: 0/0 grow/shrink: 7/97 up/down: 135/-1784 (-1649)
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| @@ -4,7 +4,7 @@ · 3 unmodified lines | |||
| 4 | #ifdef CONFIG_DEBUG_VM | 4 | #ifdef CONFIG_DEBUG_VM |
| 5 | #define VM_BUG_ON(cond) BUG_ON(cond) | 5 | #define VM_BUG_ON(cond) BUG_ON(cond) |
| 6 | #else | 6 | #else |
| 7 | #define VM_BUG_ON(cond) do { (void)(cond); } while (0) | 7 | #define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond) |
| 8 | #endif | 8 | #endif |
| 9 | 9 | ||
| 10 | #ifdef CONFIG_DEBUG_VIRTUAL | 10 | #ifdef CONFIG_DEBUG_VIRTUAL |