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MIPS: bitops: ins start position is always an immediate

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The start position for an ins instruction is always encoded as an
immediate, so allowing registers to be used by the inline asm makes no
sense. It should never happen anyway since a bit index should always be
small enough to be treated as an immediate, but remove the nonsensical
"r" for sanity.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-kernel@vger.kernel.org
This commit is contained in:
Paul Burton 2019-10-01 21:53:29 +00:00
parent 59361e9975
commit 27aab27259
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
1 changed files with 3 additions and 3 deletions
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6
arch/mips/include/asm/bitops.h
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@ -85,7 +85,7 @@ static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
" " __INS "%0, %3, %2, 1 \n"
" " __SC "%0, %1 \n"
: "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
: "ir" (bit), "r" (~0)
: "i" (bit), "r" (~0)
: __LLSC_CLOBBER);
} while (unlikely(!temp));
return;
@ -150,7 +150,7 @@ static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
" " __INS "%0, $0, %2, 1 \n"
" " __SC "%0, %1 \n"
: "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
: "ir" (bit)
: "i" (bit)
: __LLSC_CLOBBER);
} while (unlikely(!temp));
return;
@ -383,7 +383,7 @@ static inline int test_and_clear_bit(unsigned long nr,
" " __INS "%0, $0, %3, 1 \n"
" " __SC "%0, %1 \n"
: "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=&r" (res)
: "ir" (bit)
: "i" (bit)
: __LLSC_CLOBBER);
} while (unlikely(!temp));
} else {