Re: kernel/sched/core.c:961:15: error: incompatible pointer to integer conversion passing 'typeof

From: Paul E. McKenney
Date: Wed Apr 03 2024 - 15:56:56 EST

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In reply to: Nathan Chancellor: "Re: kernel/sched/core.c:961:15: error: incompatible pointer to integer conversion passing 'typeof"
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On Wed, Apr 03, 2024 at 09:00:41AM -0700, Nathan Chancellor wrote:
> Hi all,
>
> + Paul McKenney
>
> On Wed, Apr 03, 2024 at 03:26:05PM +0200, Vincent Guittot wrote:
> > Hi Naresh,
> >
> > Adding riscv people
> >
> > On Wed, 3 Apr 2024 at 09:38, Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> wrote:
> > >
> > > The riscv clang-17 defconfig build failed due to following warnings / errors
> > > on the Linux next-20240402.
> >
> > Could you confirm that there is no problem with other arch and/or
> > other toolchain ?
>
> This is not a clang specific issue, it happens with GCC too:

Some of these are fixed, but there are a few remaining failures.

I have pulled this series from -next, and apologies for putting it in
too soon.

Thanx, Paul

> $ make -skj"$(nproc)" ARCH=riscv CROSS_COMPILE=riscv64-linux- mrproper defconfig kernel/sched/core.o
> kernel/sched/core.c: In function '__wake_q_add':
> arch/riscv/include/asm/cmpxchg.h:175:62: warning: passing argument 2 of 'cmpxchg_emu_u8' makes integer from pointer without a cast [-Wint-conversion]
> 175 | __ret = cmpxchg_emu_u8((volatile u8 *)__ptr, __old, __new); \
> | ^~~~~
> | |
> | struct wake_q_node *
> include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
> 77 | # define unlikely(x) __builtin_expect(!!(x), 0)
> | ^
> arch/riscv/include/asm/cmpxchg.h:212:30: note: in expansion of macro '__cmpxchg_relaxed'
> 212 | (__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \
> | ^~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:89:29: note: in expansion of macro 'arch_cmpxchg_relaxed'
> 89 | #define raw_cmpxchg_relaxed arch_cmpxchg_relaxed
> | ^~~~~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4810:9: note: in expansion of macro 'raw_cmpxchg_relaxed'
> 4810 | raw_cmpxchg_relaxed(__ai_ptr, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~~~~~
> kernel/sched/core.c:961:22: note: in expansion of macro 'cmpxchg_relaxed'
> 961 | if (unlikely(cmpxchg_relaxed(&node->next, NULL, WAKE_Q_TAIL)))
> | ^~~~~~~~~~~~~~~
> In file included from arch/riscv/include/asm/cmpxchg.h:12,
> from arch/riscv/include/asm/atomic.h:19,
> from include/linux/atomic.h:7,
> from include/linux/cpumask.h:14,
> from include/linux/smp.h:13,
> from include/linux/lockdep.h:14,
> from include/linux/spinlock.h:63,
> from include/linux/wait.h:9,
> from include/linux/wait_bit.h:8,
> from include/linux/fs.h:6:
> include/linux/cmpxchg-emu.h:13:52: note: expected 'uintptr_t' {aka 'long unsigned int'} but argument is of type 'struct wake_q_node *'
> 13 | uintptr_t cmpxchg_emu_u8(volatile u8 *p, uintptr_t old, uintptr_t new);
> | ~~~~~~~~~~^~~
> arch/riscv/include/asm/cmpxchg.h:175:69: warning: passing argument 3 of 'cmpxchg_emu_u8' makes integer from pointer without a cast [-Wint-conversion]
> 175 | __ret = cmpxchg_emu_u8((volatile u8 *)__ptr, __old, __new); \
> | ^~~~~
> | |
> | struct wake_q_node *
> include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
> 77 | # define unlikely(x) __builtin_expect(!!(x), 0)
> | ^
> arch/riscv/include/asm/cmpxchg.h:212:30: note: in expansion of macro '__cmpxchg_relaxed'
> 212 | (__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \
> | ^~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:89:29: note: in expansion of macro 'arch_cmpxchg_relaxed'
> 89 | #define raw_cmpxchg_relaxed arch_cmpxchg_relaxed
> | ^~~~~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4810:9: note: in expansion of macro 'raw_cmpxchg_relaxed'
> 4810 | raw_cmpxchg_relaxed(__ai_ptr, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~~~~~
> kernel/sched/core.c:961:22: note: in expansion of macro 'cmpxchg_relaxed'
> 961 | if (unlikely(cmpxchg_relaxed(&node->next, NULL, WAKE_Q_TAIL)))
> | ^~~~~~~~~~~~~~~
> include/linux/cmpxchg-emu.h:13:67: note: expected 'uintptr_t' {aka 'long unsigned int'} but argument is of type 'struct wake_q_node *'
> 13 | uintptr_t cmpxchg_emu_u8(volatile u8 *p, uintptr_t old, uintptr_t new);
> | ~~~~~~~~~~^~~
> arch/riscv/include/asm/cmpxchg.h:175:23: warning: assignment to 'struct wake_q_node *' from 'uintptr_t' {aka 'long unsigned int'} makes pointer from integer without a cast [-Wint-conversion]
> 175 | __ret = cmpxchg_emu_u8((volatile u8 *)__ptr, __old, __new); \
> | ^
> include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
> 77 | # define unlikely(x) __builtin_expect(!!(x), 0)
> | ^
> arch/riscv/include/asm/cmpxchg.h:212:30: note: in expansion of macro '__cmpxchg_relaxed'
> 212 | (__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \
> | ^~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:89:29: note: in expansion of macro 'arch_cmpxchg_relaxed'
> 89 | #define raw_cmpxchg_relaxed arch_cmpxchg_relaxed
> | ^~~~~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4810:9: note: in expansion of macro 'raw_cmpxchg_relaxed'
> 4810 | raw_cmpxchg_relaxed(__ai_ptr, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~~~~~
> kernel/sched/core.c:961:22: note: in expansion of macro 'cmpxchg_relaxed'
> 961 | if (unlikely(cmpxchg_relaxed(&node->next, NULL, WAKE_Q_TAIL)))
> | ^~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:179:64: warning: passing argument 2 of 'cmpxchg_emu_u16' makes integer from pointer without a cast [-Wint-conversion]
> 179 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ^~~~~
> | |
> | struct wake_q_node *
> include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
> 77 | # define unlikely(x) __builtin_expect(!!(x), 0)
> | ^
> arch/riscv/include/asm/cmpxchg.h:212:30: note: in expansion of macro '__cmpxchg_relaxed'
> 212 | (__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \
> | ^~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:89:29: note: in expansion of macro 'arch_cmpxchg_relaxed'
> 89 | #define raw_cmpxchg_relaxed arch_cmpxchg_relaxed
> | ^~~~~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4810:9: note: in expansion of macro 'raw_cmpxchg_relaxed'
> 4810 | raw_cmpxchg_relaxed(__ai_ptr, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~~~~~
> kernel/sched/core.c:961:22: note: in expansion of macro 'cmpxchg_relaxed'
> 961 | if (unlikely(cmpxchg_relaxed(&node->next, NULL, WAKE_Q_TAIL)))
> | ^~~~~~~~~~~~~~~
> include/linux/cmpxchg-emu.h:14:54: note: expected 'uintptr_t' {aka 'long unsigned int'} but argument is of type 'struct wake_q_node *'
> 14 | uintptr_t cmpxchg_emu_u16(volatile u16 *p, uintptr_t old, uintptr_t new);
> | ~~~~~~~~~~^~~
> arch/riscv/include/asm/cmpxchg.h:179:71: warning: passing argument 3 of 'cmpxchg_emu_u16' makes integer from pointer without a cast [-Wint-conversion]
> 179 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ^~~~~
> | |
> | struct wake_q_node *
> include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
> 77 | # define unlikely(x) __builtin_expect(!!(x), 0)
> | ^
> arch/riscv/include/asm/cmpxchg.h:212:30: note: in expansion of macro '__cmpxchg_relaxed'
> 212 | (__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \
> | ^~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:89:29: note: in expansion of macro 'arch_cmpxchg_relaxed'
> 89 | #define raw_cmpxchg_relaxed arch_cmpxchg_relaxed
> | ^~~~~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4810:9: note: in expansion of macro 'raw_cmpxchg_relaxed'
> 4810 | raw_cmpxchg_relaxed(__ai_ptr, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~~~~~
> kernel/sched/core.c:961:22: note: in expansion of macro 'cmpxchg_relaxed'
> 961 | if (unlikely(cmpxchg_relaxed(&node->next, NULL, WAKE_Q_TAIL)))
> | ^~~~~~~~~~~~~~~
> include/linux/cmpxchg-emu.h:14:69: note: expected 'uintptr_t' {aka 'long unsigned int'} but argument is of type 'struct wake_q_node *'
> 14 | uintptr_t cmpxchg_emu_u16(volatile u16 *p, uintptr_t old, uintptr_t new);
> | ~~~~~~~~~~^~~
> arch/riscv/include/asm/cmpxchg.h:179:23: warning: assignment to 'struct wake_q_node *' from 'uintptr_t' {aka 'long unsigned int'} makes pointer from integer without a cast [-Wint-conversion]
> 179 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ^
> include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
> 77 | # define unlikely(x) __builtin_expect(!!(x), 0)
> | ^
> arch/riscv/include/asm/cmpxchg.h:212:30: note: in expansion of macro '__cmpxchg_relaxed'
> 212 | (__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \
> | ^~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:89:29: note: in expansion of macro 'arch_cmpxchg_relaxed'
> 89 | #define raw_cmpxchg_relaxed arch_cmpxchg_relaxed
> | ^~~~~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4810:9: note: in expansion of macro 'raw_cmpxchg_relaxed'
> 4810 | raw_cmpxchg_relaxed(__ai_ptr, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~~~~~
> kernel/sched/core.c:961:22: note: in expansion of macro 'cmpxchg_relaxed'
> 961 | if (unlikely(cmpxchg_relaxed(&node->next, NULL, WAKE_Q_TAIL)))
> | ^~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:179:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
> 179 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
> 77 | # define unlikely(x) __builtin_expect(!!(x), 0)
> | ^
> arch/riscv/include/asm/cmpxchg.h:212:30: note: in expansion of macro '__cmpxchg_relaxed'
> 212 | (__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \
> | ^~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:89:29: note: in expansion of macro 'arch_cmpxchg_relaxed'
> 89 | #define raw_cmpxchg_relaxed arch_cmpxchg_relaxed
> | ^~~~~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4810:9: note: in expansion of macro 'raw_cmpxchg_relaxed'
> 4810 | raw_cmpxchg_relaxed(__ai_ptr, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~~~~~
> kernel/sched/core.c:961:22: note: in expansion of macro 'cmpxchg_relaxed'
> 961 | if (unlikely(cmpxchg_relaxed(&node->next, NULL, WAKE_Q_TAIL)))
> | ^~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:180:9: note: here
> 180 | case 4: \
> | ^~~~
> include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
> 77 | # define unlikely(x) __builtin_expect(!!(x), 0)
> | ^
> arch/riscv/include/asm/cmpxchg.h:212:30: note: in expansion of macro '__cmpxchg_relaxed'
> 212 | (__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \
> | ^~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:89:29: note: in expansion of macro 'arch_cmpxchg_relaxed'
> 89 | #define raw_cmpxchg_relaxed arch_cmpxchg_relaxed
> | ^~~~~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4810:9: note: in expansion of macro 'raw_cmpxchg_relaxed'
> 4810 | raw_cmpxchg_relaxed(__ai_ptr, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~~~~~
> kernel/sched/core.c:961:22: note: in expansion of macro 'cmpxchg_relaxed'
> 961 | if (unlikely(cmpxchg_relaxed(&node->next, NULL, WAKE_Q_TAIL)))
> | ^~~~~~~~~~~~~~~
> kernel/sched/sched.h: In function 'mm_cid_put_lazy':
> arch/riscv/include/asm/cmpxchg.h:333:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
> 333 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/sched.h:3292:14: note: in expansion of macro 'try_cmpxchg'
> 3292 | !try_cmpxchg(&this_cpu_ptr(pcpu_cid)->cid, &cid, MM_CID_UNSET))
> | ^~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:334:9: note: here
> 334 | case 4: \
> | ^~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/sched.h:3292:14: note: in expansion of macro 'try_cmpxchg'
> 3292 | !try_cmpxchg(&this_cpu_ptr(pcpu_cid)->cid, &cid, MM_CID_UNSET))
> | ^~~~~~~~~~~
> kernel/sched/sched.h: In function 'mm_cid_get':
> arch/riscv/include/asm/cmpxchg.h:333:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
> 333 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/sched.h:3429:21: note: in expansion of macro 'try_cmpxchg'
> 3429 | if (try_cmpxchg(&this_cpu_ptr(pcpu_cid)->cid, &cid, MM_CID_UNSET))
> | ^~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:334:9: note: here
> 334 | case 4: \
> | ^~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/sched.h:3429:21: note: in expansion of macro 'try_cmpxchg'
> 3429 | if (try_cmpxchg(&this_cpu_ptr(pcpu_cid)->cid, &cid, MM_CID_UNSET))
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h: In function 'raw_atomic_cmpxchg_relaxed':
> arch/riscv/include/asm/cmpxchg.h:179:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
> 179 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:212:30: note: in expansion of macro '__cmpxchg_relaxed'
> 212 | (__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \
> | ^~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:89:29: note: in expansion of macro 'arch_cmpxchg_relaxed'
> 89 | #define raw_cmpxchg_relaxed arch_cmpxchg_relaxed
> | ^~~~~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:2108:16: note: in expansion of macro 'raw_cmpxchg_relaxed'
> 2108 | return raw_cmpxchg_relaxed(&v->counter, old, new);
> | ^~~~~~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:180:9: note: here
> 180 | case 4: \
> | ^~~~
> arch/riscv/include/asm/cmpxchg.h:212:30: note: in expansion of macro '__cmpxchg_relaxed'
> 212 | (__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \
> | ^~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:89:29: note: in expansion of macro 'arch_cmpxchg_relaxed'
> 89 | #define raw_cmpxchg_relaxed arch_cmpxchg_relaxed
> | ^~~~~~~~~~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:2108:16: note: in expansion of macro 'raw_cmpxchg_relaxed'
> 2108 | return raw_cmpxchg_relaxed(&v->counter, old, new);
> | ^~~~~~~~~~~~~~~~~~~
> kernel/sched/core.c: In function '__sched_mm_cid_migrate_from_try_steal_cid':
> arch/riscv/include/asm/cmpxchg.h:333:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
> 333 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/core.c:11724:14: note: in expansion of macro 'try_cmpxchg'
> 11724 | if (!try_cmpxchg(&src_pcpu_cid->cid, &src_cid, lazy_cid))
> | ^~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:334:9: note: here
> 334 | case 4: \
> | ^~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/core.c:11724:14: note: in expansion of macro 'try_cmpxchg'
> 11724 | if (!try_cmpxchg(&src_pcpu_cid->cid, &src_cid, lazy_cid))
> | ^~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:333:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
> 333 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/core.c:11760:14: note: in expansion of macro 'try_cmpxchg'
> 11760 | if (!try_cmpxchg(&src_pcpu_cid->cid, &lazy_cid, MM_CID_UNSET))
> | ^~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:334:9: note: here
> 334 | case 4: \
> | ^~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/core.c:11760:14: note: in expansion of macro 'try_cmpxchg'
> 11760 | if (!try_cmpxchg(&src_pcpu_cid->cid, &lazy_cid, MM_CID_UNSET))
> | ^~~~~~~~~~~
> kernel/sched/core.c: In function 'task_mm_cid_work':
> arch/riscv/include/asm/cmpxchg.h:333:25: warning: this statement may fall through [-Wimplicit-fallthrough=]
> 333 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4788:9: note: in expansion of macro 'raw_cmpxchg'
> 4788 | raw_cmpxchg(__ai_ptr, __VA_ARGS__); \
> | ^~~~~~~~~~~
> kernel/sched/core.c:11945:23: note: in expansion of macro 'cmpxchg'
> 11945 | res = cmpxchg(&mm->mm_cid_next_scan, old_scan, next_scan);
> | ^~~~~~~
> arch/riscv/include/asm/cmpxchg.h:334:9: note: here
> 334 | case 4: \
> | ^~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4788:9: note: in expansion of macro 'raw_cmpxchg'
> 4788 | raw_cmpxchg(__ai_ptr, __VA_ARGS__); \
> | ^~~~~~~~~~~
> kernel/sched/core.c:11945:23: note: in expansion of macro 'cmpxchg'
> 11945 | res = cmpxchg(&mm->mm_cid_next_scan, old_scan, next_scan);
> | ^~~~~~~
> arch/riscv/include/asm/cmpxchg.h:333:25: warning: this statement may fall through [-Wimplicit-fallthrough=]
> 333 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/core.c:11953:14: note: in expansion of macro 'try_cmpxchg'
> 11953 | if (!try_cmpxchg(&mm->mm_cid_next_scan, &old_scan, next_scan))
> | ^~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:334:9: note: here
> 334 | case 4: \
> | ^~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/core.c:11953:14: note: in expansion of macro 'try_cmpxchg'
> 11953 | if (!try_cmpxchg(&mm->mm_cid_next_scan, &old_scan, next_scan))
> | ^~~~~~~~~~~
> kernel/sched/core.c: In function 'sched_mm_cid_remote_clear':
> arch/riscv/include/asm/cmpxchg.h:333:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
> 333 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/core.c:11841:14: note: in expansion of macro 'try_cmpxchg'
> 11841 | if (!try_cmpxchg(&pcpu_cid->cid, &cid, lazy_cid))
> | ^~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:334:9: note: here
> 334 | case 4: \
> | ^~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/core.c:11841:14: note: in expansion of macro 'try_cmpxchg'
> 11841 | if (!try_cmpxchg(&pcpu_cid->cid, &cid, lazy_cid))
> | ^~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:333:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
> 333 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/core.c:11874:21: note: in expansion of macro 'try_cmpxchg'
> 11874 | if (try_cmpxchg(&pcpu_cid->cid, &lazy_cid, MM_CID_UNSET))
> | ^~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:334:9: note: here
> 334 | case 4: \
> | ^~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
> 192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
> | ^~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
> 4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> | ^~~~~~~~~~~~~~~
> kernel/sched/core.c:11874:21: note: in expansion of macro 'try_cmpxchg'
> 11874 | if (try_cmpxchg(&pcpu_cid->cid, &lazy_cid, MM_CID_UNSET))
> | ^~~~~~~~~~~
> kernel/sched/sched.h: In function 'mm_cid_pcpu_unset':
> arch/riscv/include/asm/cmpxchg.h:333:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
> 333 | __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
> | ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4788:9: note: in expansion of macro 'raw_cmpxchg'
> 4788 | raw_cmpxchg(__ai_ptr, __VA_ARGS__); \
> | ^~~~~~~~~~~
> kernel/sched/sched.h:3310:23: note: in expansion of macro 'cmpxchg'
> 3310 | res = cmpxchg(&this_cpu_ptr(pcpu_cid)->cid, cid, MM_CID_UNSET);
> | ^~~~~~~
> arch/riscv/include/asm/cmpxchg.h:334:9: note: here
> 334 | case 4: \
> | ^~~~
> arch/riscv/include/asm/cmpxchg.h:368:30: note: in expansion of macro '__cmpxchg'
> 368 | (__typeof__(*(ptr))) __cmpxchg((ptr), \
> | ^~~~~~~~~
> include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
> 55 | #define raw_cmpxchg arch_cmpxchg
> | ^~~~~~~~~~~~
> include/linux/atomic/atomic-instrumented.h:4788:9: note: in expansion of macro 'raw_cmpxchg'
> 4788 | raw_cmpxchg(__ai_ptr, __VA_ARGS__); \
> | ^~~~~~~~~~~
> kernel/sched/sched.h:3310:23: note: in expansion of macro 'cmpxchg'
> 3310 | res = cmpxchg(&this_cpu_ptr(pcpu_cid)->cid, cid, MM_CID_UNSET);
> | ^~~~~~~
>
> > > Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
> > >
> > > riscv:
> > > build:
> > > * clang-17-lkftconfig - Failed
> > > * rv32-clang-17-defconfig - Failed
> > > * clang-17-tinyconfig - Failed
> > > * rv32-clang-17-tinyconfig - Failed
> > > * clang-17-defconfig - Failed
> > > * clang-17-allnoconfig - Failed
> > > * rv32-clang-17-allnoconfig - Failed
> > >
> > > Build log:
> > > -------
> > > kernel/sched/core.c:961:15: error: incompatible pointer to integer
> > > conversion passing 'typeof (*((__ai_ptr)))' (aka 'struct wake_q_node
> > > *') to parameter of type 'uintptr_t' (aka 'unsigned long')
> > > [-Wint-conversion]
> > > 961 | if (unlikely(cmpxchg_relaxed(&node->next, NULL, WAKE_Q_TAIL)))
> > > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > There is no recent change on this code. Could it be a change in
> > cmpxchg_relaxed ?
>
> Yes, it is caused by commit df35ee400e06 ("riscv: Emulate one-byte and
> two-byte cmpxchg") in -next. There is another thread on this problem
> with a suggested diff that resolves it for me (there are other issues
> with that change as well such as break not being in the correct
> location):
>
> https://lore.kernel.org/Zgz98szFLLjTIZSO@yujie-X299/
>
> Cheers,
> Nathan

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