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[PW_SID:966233] drm: tegra: Fix undefined behavior in left shift operation#444

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[PW_SID:966233] drm: tegra: Fix undefined behavior in left shift operation#444
linux-riscv-bot wants to merge 1 commit into
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@linux-riscv-bot linux-riscv-bot commented May 25, 2025

PR for series 966233 applied to workflow__riscv__fixes

Name: drm: tegra: Fix undefined behavior in left shift operation
URL: https://patchwork.kernel.org/project/linux-riscv/list/?series=966233
Version: 1

@eleanorLYJ
drm: tegra: Fix undefined behavior in left shift operation
eb9be79 
According to the C11 standard (ISO/IEC 9899:2011, 6.5.7):
"If E1 has a signed type and E1 x 2^E2 is not representable in the result
type, the behavior is undefined."

Shifting 1 << 31 causes signed integer overflow, which leads to undefined
behavior.

Fix this by explicitly using 'BIT(31)' to ensure the shift operates on an
unsigned type, avoiding undefined behavior.

Signed-off-by: Yu-Chun Lin <eleanor15x@gmail.com>
Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>
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linux-riscv-bot commented May 25, 2025

Patch 1: "drm: tegra: Fix undefined behavior in left shift operation"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 105.62 seconds
Result: PASS

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linux-riscv-bot commented May 25, 2025

Patch 1: "drm: tegra: Fix undefined behavior in left shift operation"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 912.75 seconds
Result: PASS

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linux-riscv-bot commented May 25, 2025

Patch 1: "drm: tegra: Fix undefined behavior in left shift operation"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1187.01 seconds
Result: PASS

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linux-riscv-bot commented May 25, 2025

Patch 1: "drm: tegra: Fix undefined behavior in left shift operation"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 20.91 seconds
Result: PASS

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linux-riscv-bot commented May 25, 2025

Patch 1: "drm: tegra: Fix undefined behavior in left shift operation"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 21.25 seconds
Result: PASS

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linux-riscv-bot commented May 25, 2025

Patch 1: "drm: tegra: Fix undefined behavior in left shift operation"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 1.50 seconds
Result: PASS

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linux-riscv-bot commented May 25, 2025

Patch 1: "drm: tegra: Fix undefined behavior in left shift operation"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 68.01 seconds
Result: PASS

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linux-riscv-bot commented May 25, 2025

Patch 1: "drm: tegra: Fix undefined behavior in left shift operation"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.23 seconds
Result: PASS

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linux-riscv-bot commented May 25, 2025

Patch 1: "drm: tegra: Fix undefined behavior in left shift operation"
kdoc
Desc: Detects for kdoc errors
Duration: 0.87 seconds
Result: PASS

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linux-riscv-bot commented May 25, 2025

Patch 1: "drm: tegra: Fix undefined behavior in left shift operation"
module-param
Desc: Detect module_param changes
Duration: 0.27 seconds
Result: PASS

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linux-riscv-bot commented May 25, 2025

Patch 1: "drm: tegra: Fix undefined behavior in left shift operation"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.22 seconds
Result: PASS

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linux-riscv-bot commented May 25, 2025

Patch 1: "drm: tegra: Fix undefined behavior in left shift operation"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.30 seconds
Result: PASS

@linux-riscv-bot linux-riscv-bot deleted the pw966233 branch May 28, 2025 14:20
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@linux-riscv-bot @eleanorLYJ