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Message-ID: <CACT4Y+YkQT=VANfHurWY=LCqc2CP999=0bh2gyjTvem2Nhokgw@mail.gmail.com>
Date: Mon, 16 Jan 2017 22:11:41 +0100
From: Dmitry Vyukov <dvyukov@...gle.com>
To: kbuild test robot <lkp@...el.com>
Cc: kbuild-all@...org, Dave Jones <davej@...hat.com>,
Samuel Ortiz <samuel@...tiz.org>,
David Miller <davem@...emloft.net>,
Alexander Potapenko <glider@...gle.com>,
andreyknvl <andreyknvl@...gle.com>,
netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] net/irda: fix lockdep annotation
On Mon, Jan 16, 2017 at 7:09 PM, kbuild test robot <lkp@...el.com> wrote:
> Hi Dmitry,
>
> [auto build test ERROR on tip/locking/core]
> [also build test ERROR on v4.10-rc4 next-20170116]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url: https://github.com/0day-ci/linux/commits/Dmitry-Vyukov/net-irda-fix-lockdep-annotation/20170117-001737
> config: i386-defconfig (attached as .config)
> compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
> reproduce:
> # save the attached .config to linux build tree
> make ARCH=i386
>
> All error/warnings (new ones prefixed by >>):
>
> In file included from include/linux/mmzone.h:7:0,
> from include/linux/gfp.h:5,
> from include/linux/slab.h:14,
> from drivers/gpu/drm/i915/i915_sw_fence.c:10:
> drivers/gpu/drm/i915/i915_sw_fence.c: In function '__i915_sw_fence_wake_up_all':
>>> include/linux/spinlock.h:217:3: error: void value not ignored as it ought to be
> (void)subclass; \
>
>>> include/linux/spinlock.h:335:2: note: in expansion of macro 'raw_spin_lock_irqsave_nested'
> raw_spin_lock_irqsave_nested(spinlock_check(lock), flags, subclass); \
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> drivers/gpu/drm/i915/i915_sw_fence.c:68:2: note: in expansion of macro 'spin_lock_irqsave_nested'
> spin_lock_irqsave_nested(&x->lock, flags, 1 + !!continuation);
> ^~~~~~~~~~~~~~~~~~~~~~~~
Mailed v3.
> vim +217 include/linux/spinlock.h
>
> 211 typecheck(unsigned long, flags); \
> 212 flags = _raw_spin_lock_irqsave_nested(lock, subclass); \
> 213 } while (0)
> 214 #else
> 215 #define raw_spin_lock_irqsave_nested(lock, flags, subclass) \
> 216 do { \
> > 217 (void)subclass; \
> 218 typecheck(unsigned long, flags); \
> 219 flags = _raw_spin_lock_irqsave(lock); \
> 220 } while (0)
> 221 #endif
> 222
> 223 #else
> 224
> 225 #define raw_spin_lock_irqsave(lock, flags) \
> 226 do { \
> 227 typecheck(unsigned long, flags); \
> 228 _raw_spin_lock_irqsave(lock, flags); \
> 229 } while (0)
> 230
> 231 #define raw_spin_lock_irqsave_nested(lock, flags, subclass) \
> 232 raw_spin_lock_irqsave(lock, flags)
> 233
> 234 #endif
> 235
> 236 #define raw_spin_lock_irq(lock) _raw_spin_lock_irq(lock)
> 237 #define raw_spin_lock_bh(lock) _raw_spin_lock_bh(lock)
> 238 #define raw_spin_unlock(lock) _raw_spin_unlock(lock)
> 239 #define raw_spin_unlock_irq(lock) _raw_spin_unlock_irq(lock)
> 240
> 241 #define raw_spin_unlock_irqrestore(lock, flags) \
> 242 do { \
> 243 typecheck(unsigned long, flags); \
> 244 _raw_spin_unlock_irqrestore(lock, flags); \
> 245 } while (0)
> 246 #define raw_spin_unlock_bh(lock) _raw_spin_unlock_bh(lock)
> 247
> 248 #define raw_spin_trylock_bh(lock) \
> 249 __cond_lock(lock, _raw_spin_trylock_bh(lock))
> 250
> 251 #define raw_spin_trylock_irq(lock) \
> 252 ({ \
> 253 local_irq_disable(); \
> 254 raw_spin_trylock(lock) ? \
> 255 1 : ({ local_irq_enable(); 0; }); \
> 256 })
> 257
> 258 #define raw_spin_trylock_irqsave(lock, flags) \
> 259 ({ \
> 260 local_irq_save(flags); \
> 261 raw_spin_trylock(lock) ? \
> 262 1 : ({ local_irq_restore(flags); 0; }); \
> 263 })
> 264
> 265 /**
> 266 * raw_spin_can_lock - would raw_spin_trylock() succeed?
> 267 * @lock: the spinlock in question.
> 268 */
> 269 #define raw_spin_can_lock(lock) (!raw_spin_is_locked(lock))
> 270
> 271 /* Include rwlock functions */
> 272 #include <linux/rwlock.h>
> 273
> 274 /*
> 275 * Pull the _spin_*()/_read_*()/_write_*() functions/declarations:
> 276 */
> 277 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
> 278 # include <linux/spinlock_api_smp.h>
> 279 #else
> 280 # include <linux/spinlock_api_up.h>
> 281 #endif
> 282
> 283 /*
> 284 * Map the spin_lock functions to the raw variants for PREEMPT_RT=n
> 285 */
> 286
> 287 static __always_inline raw_spinlock_t *spinlock_check(spinlock_t *lock)
> 288 {
> 289 return &lock->rlock;
> 290 }
> 291
> 292 #define spin_lock_init(_lock) \
> 293 do { \
> 294 spinlock_check(_lock); \
> 295 raw_spin_lock_init(&(_lock)->rlock); \
> 296 } while (0)
> 297
> 298 static __always_inline void spin_lock(spinlock_t *lock)
> 299 {
> 300 raw_spin_lock(&lock->rlock);
> 301 }
> 302
> 303 static __always_inline void spin_lock_bh(spinlock_t *lock)
> 304 {
> 305 raw_spin_lock_bh(&lock->rlock);
> 306 }
> 307
> 308 static __always_inline int spin_trylock(spinlock_t *lock)
> 309 {
> 310 return raw_spin_trylock(&lock->rlock);
> 311 }
> 312
> 313 #define spin_lock_nested(lock, subclass) \
> 314 do { \
> 315 raw_spin_lock_nested(spinlock_check(lock), subclass); \
> 316 } while (0)
> 317
> 318 #define spin_lock_nest_lock(lock, nest_lock) \
> 319 do { \
> 320 raw_spin_lock_nest_lock(spinlock_check(lock), nest_lock); \
> 321 } while (0)
> 322
> 323 static __always_inline void spin_lock_irq(spinlock_t *lock)
> 324 {
> 325 raw_spin_lock_irq(&lock->rlock);
> 326 }
> 327
> 328 #define spin_lock_irqsave(lock, flags) \
> 329 do { \
> 330 raw_spin_lock_irqsave(spinlock_check(lock), flags); \
> 331 } while (0)
> 332
> 333 #define spin_lock_irqsave_nested(lock, flags, subclass) \
> 334 do { \
> > 335 raw_spin_lock_irqsave_nested(spinlock_check(lock), flags, subclass); \
> 336 } while (0)
> 337
> 338 static __always_inline void spin_unlock(spinlock_t *lock)
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all Intel Corporation
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