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riscv/atomic: Fix sign extension for RV64I
[ Upstream commit 6c58f25e69
]
The argument passed to cmpxchg is not guaranteed to be sign
extended, but lr.w sign extends on RV64I. This makes cmpxchg
fail on clang built kernels when __old is negative.
To fix this, we just cast __old to long which sign extends on
RV64I. With this fix, clang built RISC-V kernels now boot.
Link: https://github.com/ClangBuiltLinux/linux/issues/867
Signed-off-by: Nathan Huckleberry <nhuck@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
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1 changed files with 4 additions and 4 deletions
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@ -187,7 +187,7 @@
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" bnez %1, 0b\n" \
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"1:\n" \
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: "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
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: "rJ" (__old), "rJ" (__new) \
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: "rJ" ((long)__old), "rJ" (__new) \
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: "memory"); \
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break; \
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case 8: \
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@ -232,7 +232,7 @@
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RISCV_ACQUIRE_BARRIER \
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"1:\n" \
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: "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
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: "rJ" (__old), "rJ" (__new) \
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: "rJ" ((long)__old), "rJ" (__new) \
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: "memory"); \
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break; \
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case 8: \
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@ -278,7 +278,7 @@
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" bnez %1, 0b\n" \
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"1:\n" \
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: "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
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: "rJ" (__old), "rJ" (__new) \
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: "rJ" ((long)__old), "rJ" (__new) \
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: "memory"); \
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break; \
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case 8: \
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@ -324,7 +324,7 @@
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" fence rw, rw\n" \
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"1:\n" \
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: "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
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: "rJ" (__old), "rJ" (__new) \
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: "rJ" ((long)__old), "rJ" (__new) \
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: "memory"); \
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break; \
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case 8: \
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