[PATCH] arm64/sve: Add compile time checks for SVE hooks in generic functions
Mark Brown
broonie at kernel.org
Thu Apr 15 13:17:42 BST 2021
The FPSIMD code was relying on IS_ENABLED() checks in system_suppors_sve()
to cause the compiler to delete references to SVE functions in some places,
add explicit IS_ENABLED() checks back.
Fixes: ef9c5d09797db874a2 (arm64/sve: Remove redundant system_supports_sve() tests)
Reported-by: kernel test robot <lkp at intel.com>
Signed-off-by: Mark Brown <broonie at kernel.org>
---
arch/arm64/kernel/fpsimd.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index f6cd89131dc3..ad3dd34a83cf 100644
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -285,7 +285,7 @@ static void task_fpsimd_load(void)
WARN_ON(!system_supports_fpsimd());
WARN_ON(!have_cpu_fpsimd_context());
- if (test_thread_flag(TIF_SVE))
+ if (IS_ENABLED(CONFIG_ARM64_SVE) && test_thread_flag(TIF_SVE))
sve_load_state(sve_pffr(¤t->thread),
¤t->thread.uw.fpsimd_state.fpsr,
sve_vq_from_vl(current->thread.sve_vl) - 1);
@@ -307,7 +307,8 @@ static void fpsimd_save(void)
WARN_ON(!have_cpu_fpsimd_context());
if (!test_thread_flag(TIF_FOREIGN_FPSTATE)) {
- if (test_thread_flag(TIF_SVE)) {
+ if (IS_ENABLED(CONFIG_ARM64_SVE) &&
+ test_thread_flag(TIF_SVE)) {
if (WARN_ON(sve_get_vl() != last->sve_vl)) {
/*
* Can't save the user regs, so current would
--
2.20.1
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