From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Nathan Chancellor <nathan@kernel.org>,
Sudip Mukherjee <sudipm.mukherjee@gmail.com>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Sasha Levin <sashal@kernel.org>,
ndesaulniers@google.com, macro@orcam.me.uk,
linux-mips@vger.kernel.org, llvm@lists.linux.dev
Subject: [PATCH AUTOSEL 5.4 16/16] MIPS: tlbex: Explicitly compare _PAGE_NO_EXEC against 0
Date: Sun, 14 Aug 2022 12:28:31 -0400 [thread overview]
Message-ID: <20220814162833.2398478-16-sashal@kernel.org> (raw)
In-Reply-To: <20220814162833.2398478-1-sashal@kernel.org>
From: Nathan Chancellor <nathan@kernel.org>
[ Upstream commit 74de14fe05dd6b151d73cb0c73c8ec874cbdcde6 ]
When CONFIG_XPA is enabled, Clang warns:
arch/mips/mm/tlbex.c:629:24: error: converting the result of '<<' to a boolean; did you mean '(1 << _PAGE_NO_EXEC_SHIFT) != 0'? [-Werror,-Wint-in-bool-context]
if (cpu_has_rixi && !!_PAGE_NO_EXEC) {
^
arch/mips/include/asm/pgtable-bits.h:174:28: note: expanded from macro '_PAGE_NO_EXEC'
# define _PAGE_NO_EXEC (1 << _PAGE_NO_EXEC_SHIFT)
^
arch/mips/mm/tlbex.c:2568:24: error: converting the result of '<<' to a boolean; did you mean '(1 << _PAGE_NO_EXEC_SHIFT) != 0'? [-Werror,-Wint-in-bool-context]
if (!cpu_has_rixi || !_PAGE_NO_EXEC) {
^
arch/mips/include/asm/pgtable-bits.h:174:28: note: expanded from macro '_PAGE_NO_EXEC'
# define _PAGE_NO_EXEC (1 << _PAGE_NO_EXEC_SHIFT)
^
2 errors generated.
_PAGE_NO_EXEC can be '0' or '1 << _PAGE_NO_EXEC_SHIFT' depending on the
build and runtime configuration, which is what the negation operators
are trying to convey. To silence the warning, explicitly compare against
0 so the result of the '<<' operator is not implicitly converted to a
boolean.
According to its documentation, GCC enables -Wint-in-bool-context with
-Wall but this warning is not visible when building the same
configuration with GCC. It appears GCC only warns when compiling C++,
not C, although the documentation makes no note of this:
https://godbolt.org/z/x39q3brxf
Reported-by: Sudip Mukherjee (Codethink) <sudipm.mukherjee@gmail.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/mips/mm/tlbex.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index 547d813ead48..061dc5c97d5a 100644
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -629,7 +629,7 @@ static __maybe_unused void build_convert_pte_to_entrylo(u32 **p,
return;
}
- if (cpu_has_rixi && !!_PAGE_NO_EXEC) {
+ if (cpu_has_rixi && _PAGE_NO_EXEC != 0) {
if (fill_includes_sw_bits) {
UASM_i_ROTR(p, reg, reg, ilog2(_PAGE_GLOBAL));
} else {
@@ -2568,7 +2568,7 @@ static void check_pabits(void)
unsigned long entry;
unsigned pabits, fillbits;
- if (!cpu_has_rixi || !_PAGE_NO_EXEC) {
+ if (!cpu_has_rixi || _PAGE_NO_EXEC == 0) {
/*
* We'll only be making use of the fact that we can rotate bits
* into the fill if the CPU supports RIXI, so don't bother
--
2.35.1
prev parent reply other threads:[~2022-08-14 16:39 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-14 16:28 [PATCH AUTOSEL 5.4 01/16] lib/list_debug.c: Detect uninitialized lists Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 02/16] tty: serial: Fix refcount leak bug in ucc_uart.c Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 03/16] vfio: Clear the caps->buf to NULL after free Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 04/16] mips: cavium-octeon: Fix missing of_node_put() in octeon2_usb_clocks_start Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 05/16] riscv: dts: sifive: Add fu540 topology information Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 06/16] riscv: mmap with PROT_WRITE but no PROT_READ is invalid Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 07/16] RISC-V: Add fast call path of crash_kexec() Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 08/16] watchdog: export lockup_detector_reconfigure Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 09/16] powerpc/32: Don't always pass -mcpu=powerpc to the compiler Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 10/16] ALSA: core: Add async signal helpers Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 11/16] ALSA: timer: Use deferred fasync helper Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 12/16] f2fs: fix to avoid use f2fs_bug_on() in f2fs_new_node_page() Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 13/16] smb3: check xattr value length earlier Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 14/16] powerpc/64: Init jump labels before parse_early_param() Sasha Levin
2022-08-14 16:28 ` [PATCH AUTOSEL 5.4 15/16] video: fbdev: i740fb: Check the argument of i740_calc_vclk() Sasha Levin
2022-08-14 16:28 ` Sasha Levin [this message]
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