* [broonie-ci:arm64-sve-trap-mitigation 3/3] arch/arm64/kernel/entry-common.c:258:30: warning: unused variable 'sve_vq_minus_one'
@ 2026-07-01 22:45 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-07-01 22:45 UTC (permalink / raw)
To: Mark Brown; +Cc: oe-kbuild-all
tree: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/ci.git arm64-sve-trap-mitigation
head: 00a72da058c10512a992dd75733d08daed8437fc
commit: 00a72da058c10512a992dd75733d08daed8437fc [3/3] arm64/sve: Disable TIF_SVE on syscall once per second
config: arm64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260702/202607020044.UmATj7HQ-lkp@intel.com/config)
compiler: aarch64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260702/202607020044.UmATj7HQ-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/202607020044.UmATj7HQ-lkp@intel.com/
All warnings (new ones prefixed by >>):
arch/arm64/kernel/entry-common.c: In function 'fpsimd_syscall_enter':
>> arch/arm64/kernel/entry-common.c:258:30: warning: unused variable 'sve_vq_minus_one' [-Wunused-variable]
258 | unsigned int sve_vq_minus_one;
| ^~~~~~~~~~~~~~~~
vim +/sve_vq_minus_one +258 arch/arm64/kernel/entry-common.c
239
240 /*
241 * As per the ABI exit SME streaming mode and clear the SVE state not
242 * shared with FPSIMD on syscall entry.
243 */
244 static inline void fpsimd_syscall_enter(void)
245 {
246 /* Ensure PSTATE.SM is clear, but leave PSTATE.ZA as-is. */
247 if (system_supports_sme())
248 sme_smstop_sm();
249
250 /*
251 * The CPU is not in streaming mode. If non-streaming SVE is not
252 * supported, there is no SVE state that needs to be discarded.
253 */
254 if (!system_supports_sve())
255 return;
256
257 if (test_thread_flag(TIF_SVE)) {
> 258 unsigned int sve_vq_minus_one;
259
260 /*
261 * Ensure that tasks that don't block in a syscall
262 * also get a chance to drop TIF_SVE.
263 */
264 if (unlikely(time_after(jiffies,
265 current->thread.sve_timeout))) {
266 clear_thread_flag(TIF_SVE);
267 sve_user_disable();
268 } else {
269 sve_flush_live();
270 }
271 }
272
273 /*
274 * Any live non-FPSIMD SVE state has been zeroed. Allow
275 * fpsimd_save_user_state() to lazily discard SVE state until either
276 * the live state is unbound or fpsimd_syscall_exit() is called.
277 */
278 __this_cpu_write(fpsimd_last_state.to_save, FP_STATE_FPSIMD);
279 }
280
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
* [broonie-ci:arm64-sve-trap-mitigation 3/3] arch/arm64/kernel/entry-common.c:258:30: warning: unused variable 'sve_vq_minus_one'
@ 2026-07-02 2:33 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-07-02 2:33 UTC (permalink / raw)
To: Mark Brown; +Cc: oe-kbuild-all
tree: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/ci.git arm64-sve-trap-mitigation
head: 00a72da058c10512a992dd75733d08daed8437fc
commit: 00a72da058c10512a992dd75733d08daed8437fc [3/3] arm64/sve: Disable TIF_SVE on syscall once per second
config: arm64-allnoconfig (https://download.01.org/0day-ci/archive/20260702/202607021058.32muzb7w-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260702/202607021058.32muzb7w-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/202607021058.32muzb7w-lkp@intel.com/
All warnings (new ones prefixed by >>):
arch/arm64/kernel/entry-common.c: In function 'fpsimd_syscall_enter':
>> arch/arm64/kernel/entry-common.c:258:30: warning: unused variable 'sve_vq_minus_one' [-Wunused-variable]
258 | unsigned int sve_vq_minus_one;
| ^~~~~~~~~~~~~~~~
vim +/sve_vq_minus_one +258 arch/arm64/kernel/entry-common.c
239
240 /*
241 * As per the ABI exit SME streaming mode and clear the SVE state not
242 * shared with FPSIMD on syscall entry.
243 */
244 static inline void fpsimd_syscall_enter(void)
245 {
246 /* Ensure PSTATE.SM is clear, but leave PSTATE.ZA as-is. */
247 if (system_supports_sme())
248 sme_smstop_sm();
249
250 /*
251 * The CPU is not in streaming mode. If non-streaming SVE is not
252 * supported, there is no SVE state that needs to be discarded.
253 */
254 if (!system_supports_sve())
255 return;
256
257 if (test_thread_flag(TIF_SVE)) {
> 258 unsigned int sve_vq_minus_one;
259
260 /*
261 * Ensure that tasks that don't block in a syscall
262 * also get a chance to drop TIF_SVE.
263 */
264 if (unlikely(time_after(jiffies,
265 current->thread.sve_timeout))) {
266 clear_thread_flag(TIF_SVE);
267 sve_user_disable();
268 } else {
269 sve_flush_live();
270 }
271 }
272
273 /*
274 * Any live non-FPSIMD SVE state has been zeroed. Allow
275 * fpsimd_save_user_state() to lazily discard SVE state until either
276 * the live state is unbound or fpsimd_syscall_exit() is called.
277 */
278 __this_cpu_write(fpsimd_last_state.to_save, FP_STATE_FPSIMD);
279 }
280
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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