Messages in this thread | | | From | Christophe de Dinechin <> | Subject | [PATCH 0/3] trivial: Fix several compilation errors/warnings with GCC12 | Date | Thu, 14 Apr 2022 17:08:52 +0200 |
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Compiling with GCC 12 using defconfig generates a number of build errors due to new warnings, notably array-bounds checks. Some of these warnings appear legitimate and relatively easy to fix.
Note that this series is not sufficient for a clean build yet. There are in particular a number of warnings reported by the array-bounds check that appear bogus, like:
| In function ‘__native_read_cr3’, | inlined from ‘__read_cr3’ | at ./arch/x86/include/asm/special_insns.h:169:9, | inlined from ‘read_cr3_pa’ | at ./arch/x86/include/asm/processor.h:252:9, | inlined from ‘relocate_restore_code’ | at arch/x86/power/hibernate.c:165:17: | ./arch/x86/include/asm/special_insns.h:48:9: error: | array subscript 0 is outside array bounds of ‘unsigned int[0]’ | [-Werror=array-bounds] | 48 | asm volatile("mov %%cr3,%0\n\t" : "=r" (val) : __FORCE_ORDER); | | ^~~ | cc1: all warnings being treated as errors
The error above is for an instruction that does not obviously address any C array, in particular since the asm constraint is "=r" and not "=rm".
Consequently, the series here only addresses a few low hanging fruits that appear legitimate and relatively easy to fix.
Christophe de Dinechin (3): sched/headers: Fix compilation error with GCC 12 nodemask.h: Fix compilation error with GCC12 virtio-pci: Use cpumask_available to fix compilation error
drivers/virtio/virtio_pci_common.c | 2 +- include/linux/nodemask.h | 13 ++++++------- kernel/sched/sched.h | 11 +++++++++-- 3 files changed, 16 insertions(+), 10 deletions(-)
-- 2.35.1
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