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8ec8490a19
linux/arch/arm64
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D Scott Phillips 8ec8490a19 arm64: Fix bit-shifting UB in the MIDR_CPU_MODEL() macro 
CONFIG_UBSAN_SHIFT with gcc-5 complains that the shifting of
ARM_CPU_IMP_AMPERE (0xC0) into bits [31:24] by MIDR_CPU_MODEL() is
undefined behavior. Well, sort of, it actually spells the error as:

 arch/arm64/kernel/proton-pack.c: In function 'spectre_bhb_loop_affected':
 arch/arm64/include/asm/cputype.h:44:2: error: initializer element is not constant
   (((imp)   << MIDR_IMPLEMENTOR_SHIFT) | \
   ^

This isn't an issue for other Implementor codes, as all the other codes
have zero in the top bit and so are representable as a signed int.

Cast the implementor code to unsigned in MIDR_CPU_MODEL to remove the
undefined behavior.

Fixes: 0e5d5ae837 ("arm64: Add AMPERE1 to the Spectre-BHB affected list")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: D Scott Phillips <scott@os.amperecomputing.com>
Link: https://lore.kernel.org/r/20221102160106.1096948-1-scott@os.amperecomputing.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2022-11-09 09:51:39 +00:00
..
boot EFI updates for v6.1 2022-10-09 08:56:54 -07:00
configs This update includes the following changes: 2022-10-10 13:04:25 -07:00
crypto This update includes the following changes: 2022-10-10 13:04:25 -07:00
hyperv hyperv: simplify and rename generate_guest_id 2022-09-28 13:36:56 +00:00
include arm64: Fix bit-shifting UB in the MIDR_CPU_MODEL() macro 2022-11-09 09:51:39 +00:00
kernel arm64: cpufeature: Fix the visibility of compat hwcaps 2022-11-03 18:04:56 +00:00
kvm ARM: 2022-10-11 20:07:44 -07:00
lib Networking changes for 6.0. 2022-08-03 16:29:08 -07:00
mm arm64: fix rodata=full again 2022-11-08 16:21:40 +00:00
net bpf: arm64: No support of struct argument in trampoline programs 2022-09-06 19:51:14 -07:00
tools arm64/sysreg: Fix typo in SCTR_EL1.SPINTMASK 2022-10-07 14:30:11 +01:00
xen
Kbuild
Kconfig arm64 fixes: 2022-10-14 12:38:03 -07:00
Kconfig.debug
Kconfig.platforms ARM: SoC code changes for 6.1 2022-10-06 11:22:25 -07:00
Makefile Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00