From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Thomas Gleixner <tglx@linutronix.de>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.14 21/53] x86: math-emu: Hide clang warnings for 16-bit overflow
Date: Mon, 5 Aug 2019 15:02:46 +0200 [thread overview]
Message-ID: <20190805124930.428360845@linuxfoundation.org> (raw)
In-Reply-To: <20190805124927.973499541@linuxfoundation.org>
[ Upstream commit 29e7e9664aec17b94a9c8c5a75f8d216a206aa3a ]
clang warns about a few parts of the math-emu implementation
where a 16-bit integer becomes negative during assignment:
arch/x86/math-emu/poly_tan.c:88:35: error: implicit conversion from 'int' to 'short' changes value from 49216 to -16320 [-Werror,-Wconstant-conversion]
(0x41 + EXTENDED_Ebias) | SIGN_Negative);
~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
arch/x86/math-emu/fpu_emu.h:180:58: note: expanded from macro 'setexponent16'
#define setexponent16(x,y) { (*(short *)&((x)->exp)) = (y); }
~ ^
arch/x86/math-emu/reg_constant.c:37:32: error: implicit conversion from 'int' to 'short' changes value from 49085 to -16451 [-Werror,-Wconstant-conversion]
FPU_REG const CONST_PI2extra = MAKE_REG(NEG, -66,
^~~~~~~~~~~~~~~~~~
arch/x86/math-emu/reg_constant.c:21:25: note: expanded from macro 'MAKE_REG'
((EXTENDED_Ebias+(e)) | ((SIGN_##s != 0)*0x8000)) }
~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/math-emu/reg_constant.c:48:28: error: implicit conversion from 'int' to 'short' changes value from 65535 to -1 [-Werror,-Wconstant-conversion]
FPU_REG const CONST_QNaN = MAKE_REG(NEG, EXP_OVER, 0x00000000, 0xC0000000);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/math-emu/reg_constant.c:21:25: note: expanded from macro 'MAKE_REG'
((EXTENDED_Ebias+(e)) | ((SIGN_##s != 0)*0x8000)) }
~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
The code is correct as is, so add a typecast to shut up the warnings.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190712090816.350668-1-arnd@arndb.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/x86/math-emu/fpu_emu.h | 2 +-
arch/x86/math-emu/reg_constant.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/math-emu/fpu_emu.h b/arch/x86/math-emu/fpu_emu.h
index a5a41ec580721..0c122226ca56f 100644
--- a/arch/x86/math-emu/fpu_emu.h
+++ b/arch/x86/math-emu/fpu_emu.h
@@ -177,7 +177,7 @@ static inline void reg_copy(FPU_REG const *x, FPU_REG *y)
#define setexponentpos(x,y) { (*(short *)&((x)->exp)) = \
((y) + EXTENDED_Ebias) & 0x7fff; }
#define exponent16(x) (*(short *)&((x)->exp))
-#define setexponent16(x,y) { (*(short *)&((x)->exp)) = (y); }
+#define setexponent16(x,y) { (*(short *)&((x)->exp)) = (u16)(y); }
#define addexponent(x,y) { (*(short *)&((x)->exp)) += (y); }
#define stdexp(x) { (*(short *)&((x)->exp)) += EXTENDED_Ebias; }
diff --git a/arch/x86/math-emu/reg_constant.c b/arch/x86/math-emu/reg_constant.c
index 8dc9095bab224..742619e94bdf2 100644
--- a/arch/x86/math-emu/reg_constant.c
+++ b/arch/x86/math-emu/reg_constant.c
@@ -18,7 +18,7 @@
#include "control_w.h"
#define MAKE_REG(s, e, l, h) { l, h, \
- ((EXTENDED_Ebias+(e)) | ((SIGN_##s != 0)*0x8000)) }
+ (u16)((EXTENDED_Ebias+(e)) | ((SIGN_##s != 0)*0x8000)) }
FPU_REG const CONST_1 = MAKE_REG(POS, 0, 0x00000000, 0x80000000);
#if 0
--
2.20.1
next prev parent reply other threads:[~2019-08-05 13:07 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-05 13:02 [PATCH 4.14 00/53] 4.14.137-stable review Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 01/53] ARM: riscpc: fix DMA Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 02/53] ARM: dts: rockchip: Make rk3288-veyron-minnie run at hs200 Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 03/53] ARM: dts: rockchip: Make rk3288-veyron-mickeys emmc work again Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 04/53] ARM: dts: rockchip: Mark that the rk3288 timer might stop in suspend Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 05/53] ftrace: Enable trampoline when rec count returns back to one Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 06/53] kernel/module.c: Only return -EEXIST for modules that have finished loading Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 07/53] MIPS: lantiq: Fix bitfield masking Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 08/53] dmaengine: rcar-dmac: Reject zero-length slave DMA requests Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 09/53] clk: tegra210: fix PLLU and PLLU_OUT1 Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 10/53] fs/adfs: super: fix use-after-free bug Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 11/53] btrfs: fix minimum number of chunk errors for DUP Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 12/53] cifs: Fix a race condition with cifs_echo_request Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 13/53] ceph: fix improper use of smp_mb__before_atomic() Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 14/53] ceph: return -ERANGE if virtual xattr value didnt fit in buffer Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 15/53] ACPI: blacklist: fix clang warning for unused DMI table Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 16/53] scsi: zfcp: fix GCC compiler warning emitted with -Wmaybe-uninitialized Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 17/53] x86: kvm: avoid constant-conversion warning Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 18/53] ACPI: fix false-positive -Wuninitialized warning Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 19/53] be2net: Signal that the device cannot transmit during reconfiguration Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 20/53] x86/apic: Silence -Wtype-limits compiler warnings Greg Kroah-Hartman
2019-08-05 13:02 ` Greg Kroah-Hartman [this message]
2019-08-05 13:02 ` [PATCH 4.14 22/53] mm/cma.c: fail if fixed declaration cant be honored Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 23/53] coda: add error handling for fget Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 24/53] coda: fix build using bare-metal toolchain Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 25/53] uapi linux/coda_psdev.h: move upc_req definition from uapi to kernel side headers Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 26/53] drivers/rapidio/devices/rio_mport_cdev.c: NUL terminate some strings Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 27/53] ipc/mqueue.c: only perform resource calculation if user valid Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 28/53] xen/pv: Fix a boot up hang revealed by int3 self test Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 29/53] x86/kvm: Dont call kvm_spurious_fault() from .fixup Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 30/53] x86/paravirt: Fix callee-saved function ELF sizes Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 31/53] x86, boot: Remove multiple copy of static function sanitize_boot_params() Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 32/53] drm/nouveau: fix memory leak in nouveau_conn_reset() Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 33/53] kbuild: initialize CLANG_FLAGS correctly in the top Makefile Greg Kroah-Hartman
2019-08-05 13:02 ` [PATCH 4.14 34/53] Btrfs: fix incremental send failure after deduplication Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 35/53] Btrfs: fix race leading to fs corruption after transaction abort Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 36/53] mmc: dw_mmc: Fix occasional hang after tuning on eMMC Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 37/53] gpiolib: fix incorrect IRQ requesting of an active-low lineevent Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 38/53] IB/hfi1: Fix Spectre v1 vulnerability Greg Kroah-Hartman
2019-08-05 14:16 ` Gustavo A. R. Silva
2019-08-26 9:06 ` Greg Kroah-Hartman
2019-08-26 21:23 ` Gustavo A. R. Silva
2019-08-05 13:03 ` [PATCH 4.14 39/53] selinux: fix memory leak in policydb_init() Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 40/53] s390/dasd: fix endless loop after read unit address configuration Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 41/53] parisc: Fix build of compressed kernel even with debug enabled Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 42/53] drivers/perf: arm_pmu: Fix failure path in PM notifier Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 43/53] nbd: replace kill_bdev() with __invalidate_device() again Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 44/53] xen/swiotlb: fix condition for calling xen_destroy_contiguous_region() Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 45/53] IB/mlx5: Fix unreg_umr to ignore the mkey state Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 46/53] IB/mlx5: Use direct mkey destroy command upon UMR unreg failure Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 47/53] IB/mlx5: Move MRs to a kernel PD when freeing them to the MR cache Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 48/53] IB/mlx5: Fix RSS Toeplitz setup to be aligned with the HW specification Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 49/53] IB/hfi1: Check for error on call to alloc_rsm_map_table Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 50/53] eeprom: at24: make spd world-readable again Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 51/53] objtool: Support GCC 9 cold subfunction naming scheme Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 52/53] gcc-9: properly declare the {pv,hv}clock_page storage Greg Kroah-Hartman
2019-08-05 13:03 ` [PATCH 4.14 53/53] x86/vdso: Prevent segfaults due to hoisted vclock reads Greg Kroah-Hartman
2019-08-06 1:06 ` [PATCH 4.14 00/53] 4.14.137-stable review shuah
2019-08-06 3:34 ` Naresh Kamboju
2019-08-06 7:16 ` Jack Wang
2019-08-06 15:49 ` Guenter Roeck
2019-08-06 18:29 ` Jon Hunter
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