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![Linus Torvalds](/assets/img/avatar_default.png)
There are only three patches this time, most other changes to files in include/asm-generic tend to go through the tree of whoever depends on the change. Two patches are cleanups for stuff that is no longer needed, the main change is to adapt the generic version of BUG_ON() for CONFIG_BUG=n to make it behave consistently with BUG(). This avoids undefined behavior along with a number of warnings about that undefined behavior in randconfig builds when we keep going on after hitting a BUG_ON(). -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUAVvRXDGCrR//JCVInAQKUFRAAmp23pohv08LZzXL8Qu7XfFN+b1RkZ936 WYBeiA9PEWufQs2hgXaEUXy0onO7ah4cs2NWfkaBPyxT+I9mN+ThdzqVrlTE+AEO 2K0f2RaZANC238zB86Yv/YvTj7FegH0DDdMBq/P06vlYdgBegx49U3pMpguxl3d0 /q9MyqTzo9j4uOEK4ix4/Dko+4eKIS5Y/xeb0TkeKA6HiBVzAhGLZFl+eMku07Bf ap8B705hBDXSBFeWcK9AvKjHZCM+FCkb+C3TXo9x5tUu8g5OIG1t962OQvT9ldsP rvo5ppRh/TAY2Z9chN3cKrsvshbHiZ9uRzeksCunL+SK+dOhEIPCVzLXndQpi3RD NgeNKgo6gKYdle44pEj0EH2ktuvr0u8sbjQg9SY2miC1H4DmEbCakSqtQegHXTKd chJ6xyNiQXktdfo0pFOtCA2gjqiAriugttBqUtGcK9zRqjGGpP5hOUQVm3jR7UMp Hjb+oj5o+Gjz5J1t5zsjbhFINDCHAgXRzqqaoT9RfE9+QlUftUhu+N9KVFgzhe9I 93VHaqgGIRoi856BO7UZSaMGhy7ljm1nQ18jP9aZl/tBco0kpd3AO8og9dJ0u2j+ 3fEqAHH30ia8GJCfIDnolxTL6uaqcCIeAoLgGcmn+QZS7ka+tD+000rtgd2pdy9/ gy/VPpFG064= =8tPL -----END PGP SIGNATURE----- Merge tag 'asm-generic-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic Pull asm-generic updates from Arnd Bergmann: "There are only three patches this time, most other changes to files in include/asm-generic tend to go through the tree of whoever depends on the change. Two patches are cleanups for stuff that is no longer needed, the main change is to adapt the generic version of BUG_ON() for CONFIG_BUG=n to make it behave consistently with BUG(). This avoids undefined behavior along with a number of warnings about that undefined behavior in randconfig builds when we keep going on after hitting a BUG_ON()" * tag 'asm-generic-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: asm-generic: remove old nonatomic-io wrapper files asm-generic: default BUG_ON(x) to if(x)BUG() asm-generic: page.h: Remove useless get_user_page and free_user_page
220 lines
5.9 KiB
C
220 lines
5.9 KiB
C
#ifndef _ASM_GENERIC_BUG_H
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#define _ASM_GENERIC_BUG_H
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#include <linux/compiler.h>
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#ifdef CONFIG_GENERIC_BUG
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#define BUGFLAG_WARNING (1 << 0)
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#define BUGFLAG_TAINT(taint) (BUGFLAG_WARNING | ((taint) << 8))
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#define BUG_GET_TAINT(bug) ((bug)->flags >> 8)
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#endif
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#ifndef __ASSEMBLY__
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#include <linux/kernel.h>
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#ifdef CONFIG_BUG
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#ifdef CONFIG_GENERIC_BUG
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struct bug_entry {
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#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
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unsigned long bug_addr;
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#else
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signed int bug_addr_disp;
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#endif
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#ifdef CONFIG_DEBUG_BUGVERBOSE
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#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
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const char *file;
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#else
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signed int file_disp;
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#endif
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unsigned short line;
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#endif
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unsigned short flags;
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};
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#endif /* CONFIG_GENERIC_BUG */
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/*
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* Don't use BUG() or BUG_ON() unless there's really no way out; one
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* example might be detecting data structure corruption in the middle
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* of an operation that can't be backed out of. If the (sub)system
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* can somehow continue operating, perhaps with reduced functionality,
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* it's probably not BUG-worthy.
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*
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* If you're tempted to BUG(), think again: is completely giving up
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* really the *only* solution? There are usually better options, where
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* users don't need to reboot ASAP and can mostly shut down cleanly.
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*/
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#ifndef HAVE_ARCH_BUG
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#define BUG() do { \
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printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
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panic("BUG!"); \
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} while (0)
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#endif
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#ifndef HAVE_ARCH_BUG_ON
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#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
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#endif
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/*
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* WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
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* significant issues that need prompt attention if they should ever
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* appear at runtime. Use the versions with printk format strings
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* to provide better diagnostics.
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*/
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#ifndef __WARN_TAINT
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extern __printf(3, 4)
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void warn_slowpath_fmt(const char *file, const int line,
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const char *fmt, ...);
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extern __printf(4, 5)
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void warn_slowpath_fmt_taint(const char *file, const int line, unsigned taint,
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const char *fmt, ...);
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extern void warn_slowpath_null(const char *file, const int line);
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#define WANT_WARN_ON_SLOWPATH
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#define __WARN() warn_slowpath_null(__FILE__, __LINE__)
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#define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg)
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#define __WARN_printf_taint(taint, arg...) \
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warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg)
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#else
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#define __WARN() __WARN_TAINT(TAINT_WARN)
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#define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0)
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#define __WARN_printf_taint(taint, arg...) \
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do { printk(arg); __WARN_TAINT(taint); } while (0)
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#endif
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/* used internally by panic.c */
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struct warn_args;
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void __warn(const char *file, int line, void *caller, unsigned taint,
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struct pt_regs *regs, struct warn_args *args);
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#ifndef WARN_ON
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#define WARN_ON(condition) ({ \
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int __ret_warn_on = !!(condition); \
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if (unlikely(__ret_warn_on)) \
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__WARN(); \
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unlikely(__ret_warn_on); \
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})
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#endif
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#ifndef WARN
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#define WARN(condition, format...) ({ \
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int __ret_warn_on = !!(condition); \
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if (unlikely(__ret_warn_on)) \
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__WARN_printf(format); \
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unlikely(__ret_warn_on); \
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})
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#endif
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#define WARN_TAINT(condition, taint, format...) ({ \
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int __ret_warn_on = !!(condition); \
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if (unlikely(__ret_warn_on)) \
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__WARN_printf_taint(taint, format); \
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unlikely(__ret_warn_on); \
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})
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#define WARN_ON_ONCE(condition) ({ \
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static bool __section(.data.unlikely) __warned; \
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int __ret_warn_once = !!(condition); \
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\
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if (unlikely(__ret_warn_once && !__warned)) { \
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__warned = true; \
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WARN_ON(1); \
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} \
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unlikely(__ret_warn_once); \
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})
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#define WARN_ONCE(condition, format...) ({ \
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static bool __section(.data.unlikely) __warned; \
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int __ret_warn_once = !!(condition); \
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\
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if (unlikely(__ret_warn_once && !__warned)) { \
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__warned = true; \
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WARN(1, format); \
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} \
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unlikely(__ret_warn_once); \
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})
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#define WARN_TAINT_ONCE(condition, taint, format...) ({ \
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static bool __section(.data.unlikely) __warned; \
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int __ret_warn_once = !!(condition); \
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\
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if (unlikely(__ret_warn_once && !__warned)) { \
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__warned = true; \
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WARN_TAINT(1, taint, format); \
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} \
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unlikely(__ret_warn_once); \
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})
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#else /* !CONFIG_BUG */
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#ifndef HAVE_ARCH_BUG
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#define BUG() do {} while (1)
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#endif
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#ifndef HAVE_ARCH_BUG_ON
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#define BUG_ON(condition) do { if (condition) BUG(); } while (0)
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#endif
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#ifndef HAVE_ARCH_WARN_ON
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#define WARN_ON(condition) ({ \
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int __ret_warn_on = !!(condition); \
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unlikely(__ret_warn_on); \
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})
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#endif
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#ifndef WARN
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#define WARN(condition, format...) ({ \
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int __ret_warn_on = !!(condition); \
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no_printk(format); \
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unlikely(__ret_warn_on); \
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})
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#endif
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#define WARN_ON_ONCE(condition) WARN_ON(condition)
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#define WARN_ONCE(condition, format...) WARN(condition, format)
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#define WARN_TAINT(condition, taint, format...) WARN(condition, format)
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#define WARN_TAINT_ONCE(condition, taint, format...) WARN(condition, format)
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#endif
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/*
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* WARN_ON_SMP() is for cases that the warning is either
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* meaningless for !SMP or may even cause failures.
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* This is usually used for cases that we have
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* WARN_ON(!spin_is_locked(&lock)) checks, as spin_is_locked()
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* returns 0 for uniprocessor settings.
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* It can also be used with values that are only defined
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* on SMP:
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*
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* struct foo {
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* [...]
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* #ifdef CONFIG_SMP
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* int bar;
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* #endif
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* };
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*
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* void func(struct foo *zoot)
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* {
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* WARN_ON_SMP(!zoot->bar);
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*
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* For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(),
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* and should be a nop and return false for uniprocessor.
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*
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* if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set
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* and x is true.
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*/
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#ifdef CONFIG_SMP
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# define WARN_ON_SMP(x) WARN_ON(x)
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#else
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/*
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* Use of ({0;}) because WARN_ON_SMP(x) may be used either as
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* a stand alone line statement or as a condition in an if ()
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* statement.
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* A simple "0" would cause gcc to give a "statement has no effect"
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* warning.
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*/
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# define WARN_ON_SMP(x) ({0;})
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#endif
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#endif /* __ASSEMBLY__ */
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#endif
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