From: kernel test robot <lkp@intel.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev
Subject: [mark:arm64/percpu-fixup 15/17] clang diag: arch/arm64/include/asm/percpu.h:341:1: warning: value size does not match register size specified by the constraint and modifier
Date: Sun, 02 Aug 2026 07:11:30 +0800 [thread overview]
Message-ID: <202608020748.H4paFOzR-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/percpu-fixup
head: f118f6b23da9a83459d961ce6fffa6af0ec1bf39
commit: c45891bccd87033358a8d255b0f5ab8a74765d5d [15/17] arm64: percpu: Implement preemptible CMPXCHG ops
config: arm64-randconfig-001-20260802 (https://download.01.org/0day-ci/archive/20260802/202608020748.H4paFOzR-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
rustc: rustc 1.96.0 (ac68faa20 2026-05-25)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260802/202608020748.H4paFOzR-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608020748.H4paFOzR-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> clang diag: arch/arm64/include/asm/percpu.h:341:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
clang diag: arch/arm64/include/asm/percpu.h:342:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
clang diag: arch/arm64/include/asm/percpu.h:343:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
--
| ^
arch/arm64/include/asm/percpu.h:343:1: note: use constraint modifier "w"
arch/arm64/include/asm/percpu.h:317:19: note: expanded from macro 'PERCPU_CMPXCHG_OP'
317 | " mov %[oldval], %[old]\n" \
| ^
3 warnings generated.
In file included from <built-in>:4:
In file included from lib/vdso/gettimeofday.c:24:
In file included from arch/arm64/include/asm/vdso/gettimeofday.h:15:
In file included from arch/arm64/include/asm/arch_timer.h:18:
In file included from include/linux/percpu.h:5:
In file included from include/linux/alloc_tag.h:12:
arch/arm64/include/asm/percpu.h:341:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
341 | PERCPU_CMPXCHG_OP(w, b, 8)
| ^
arch/arm64/include/asm/percpu.h:328:15: note: expanded from macro 'PERCPU_CMPXCHG_OP'
328 | [old] "r" (xwreg_zero_extend(old, w, sz)), \
| ^
arch/arm64/include/asm/xwreg.h:11:38: note: expanded from macro 'xwreg_zero_extend'
11 | #define xwreg_zero_extend(v, xw, sz) ((xwreg_t(xw))(u##sz)(v))
| ^
arch/arm64/include/asm/percpu.h:341:1: note: use constraint modifier "w"
arch/arm64/include/asm/percpu.h:317:19: note: expanded from macro 'PERCPU_CMPXCHG_OP'
317 | " mov %[oldval], %[old]\n" \
| ^
arch/arm64/include/asm/percpu.h:342:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
342 | PERCPU_CMPXCHG_OP(w, h, 16)
| ^
arch/arm64/include/asm/percpu.h:328:15: note: expanded from macro 'PERCPU_CMPXCHG_OP'
328 | [old] "r" (xwreg_zero_extend(old, w, sz)), \
| ^
arch/arm64/include/asm/xwreg.h:11:38: note: expanded from macro 'xwreg_zero_extend'
11 | #define xwreg_zero_extend(v, xw, sz) ((xwreg_t(xw))(u##sz)(v))
| ^
arch/arm64/include/asm/percpu.h:342:1: note: use constraint modifier "w"
arch/arm64/include/asm/percpu.h:317:19: note: expanded from macro 'PERCPU_CMPXCHG_OP'
317 | " mov %[oldval], %[old]\n" \
| ^
arch/arm64/include/asm/percpu.h:343:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
343 | PERCPU_CMPXCHG_OP(w, , 32)
| ^
arch/arm64/include/asm/percpu.h:328:15: note: expanded from macro 'PERCPU_CMPXCHG_OP'
328 | [old] "r" (xwreg_zero_extend(old, w, sz)), \
| ^
arch/arm64/include/asm/xwreg.h:11:38: note: expanded from macro 'xwreg_zero_extend'
11 | #define xwreg_zero_extend(v, xw, sz) ((xwreg_t(xw))(u##sz)(v))
| ^
arch/arm64/include/asm/percpu.h:343:1: note: use constraint modifier "w"
arch/arm64/include/asm/percpu.h:317:19: note: expanded from macro 'PERCPU_CMPXCHG_OP'
317 | " mov %[oldval], %[old]\n" \
| ^
3 warnings generated.
In file included from rust/helpers/helpers.c:41:
In file included from rust/helpers/acpi.c:3:
In file included from include/linux/acpi.h:14:
In file included from include/linux/resource_ext.h:11:
In file included from include/linux/slab.h:17:
In file included from include/linux/gfp.h:7:
In file included from include/linux/mmzone.h:8:
In file included from include/linux/spinlock.h:59:
In file included from include/linux/irqflags.h:19:
arch/arm64/include/asm/percpu.h:341:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
341 | PERCPU_CMPXCHG_OP(w, b, 8)
| ^
arch/arm64/include/asm/percpu.h:328:15: note: expanded from macro 'PERCPU_CMPXCHG_OP'
328 | [old] "r" (xwreg_zero_extend(old, w, sz)), \
| ^
arch/arm64/include/asm/xwreg.h:11:38: note: expanded from macro 'xwreg_zero_extend'
11 | #define xwreg_zero_extend(v, xw, sz) ((xwreg_t(xw))(u##sz)(v))
| ^
arch/arm64/include/asm/percpu.h:341:1: note: use constraint modifier "w"
arch/arm64/include/asm/percpu.h:317:19: note: expanded from macro 'PERCPU_CMPXCHG_OP'
317 | " mov %[oldval], %[old]\n" \
| ^
arch/arm64/include/asm/percpu.h:342:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
342 | PERCPU_CMPXCHG_OP(w, h, 16)
| ^
arch/arm64/include/asm/percpu.h:328:15: note: expanded from macro 'PERCPU_CMPXCHG_OP'
328 | [old] "r" (xwreg_zero_extend(old, w, sz)), \
| ^
arch/arm64/include/asm/xwreg.h:11:38: note: expanded from macro 'xwreg_zero_extend'
11 | #define xwreg_zero_extend(v, xw, sz) ((xwreg_t(xw))(u##sz)(v))
| ^
arch/arm64/include/asm/percpu.h:342:1: note: use constraint modifier "w"
arch/arm64/include/asm/percpu.h:317:19: note: expanded from macro 'PERCPU_CMPXCHG_OP'
317 | " mov %[oldval], %[old]\n" \
| ^
arch/arm64/include/asm/percpu.h:343:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
343 | PERCPU_CMPXCHG_OP(w, , 32)
| ^
arch/arm64/include/asm/percpu.h:328:15: note: expanded from macro 'PERCPU_CMPXCHG_OP'
328 | [old] "r" (xwreg_zero_extend(old, w, sz)), \
| ^
arch/arm64/include/asm/xwreg.h:11:38: note: expanded from macro 'xwreg_zero_extend'
11 | #define xwreg_zero_extend(v, xw, sz) ((xwreg_t(xw))(u##sz)(v))
| ^
arch/arm64/include/asm/percpu.h:343:1: note: use constraint modifier "w"
arch/arm64/include/asm/percpu.h:317:19: note: expanded from macro 'PERCPU_CMPXCHG_OP'
317 | " mov %[oldval], %[old]\n" \
| ^
>> clang diag: arch/arm64/include/asm/percpu.h:341:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
clang diag: arch/arm64/include/asm/percpu.h:342:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
clang diag: arch/arm64/include/asm/percpu.h:343:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
>> clang diag: arch/arm64/include/asm/percpu.h:341:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
clang diag: arch/arm64/include/asm/percpu.h:342:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
clang diag: arch/arm64/include/asm/percpu.h:343:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
>> clang diag: arch/arm64/include/asm/percpu.h:341:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
clang diag: arch/arm64/include/asm/percpu.h:342:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
clang diag: arch/arm64/include/asm/percpu.h:343:1: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
3 warnings generated.
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2026-08-01 23:12 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=202608020748.H4paFOzR-lkp@intel.com \
--to=lkp@intel.com \
--cc=llvm@lists.linux.dev \
--cc=mark.rutland@arm.com \
--cc=oe-kbuild-all@lists.linux.dev \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.