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Message-ID: <20211118192200.799d9249@xhacker>
Date: Thu, 18 Nov 2021 19:22:00 +0800
From: Jisheng Zhang <jszhang3@...l.ustc.edu.cn>
To: Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
"Björn Töpel" <bjorn@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
Masahiro Yamada <masahiroy@...nel.org>,
Michal Marek <michal.lkml@...kovi.net>,
Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Kefeng Wang <wangkefeng.wang@...wei.com>,
Tong Tiangen <tongtiangen@...wei.com>,
linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, bpf@...r.kernel.org,
linux-kbuild@...r.kernel.org
Subject: [PATCH 01/12] riscv: remove unused __cmpxchg_user() macro
From: Jisheng Zhang <jszhang@...nel.org>
This macro is defined but not used, remove it.
Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
arch/riscv/include/asm/uaccess.h | 75 --------------------------------
1 file changed, 75 deletions(-)
diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h
index f314ff44c48d..9f9219545e59 100644
--- a/arch/riscv/include/asm/uaccess.h
+++ b/arch/riscv/include/asm/uaccess.h
@@ -388,81 +388,6 @@ unsigned long __must_check clear_user(void __user *to, unsigned long n)
__clear_user(to, n) : n;
}
-/*
- * Atomic compare-and-exchange, but with a fixup for userspace faults. Faults
- * will set "err" to -EFAULT, while successful accesses return the previous
- * value.
- */
-#define __cmpxchg_user(ptr, old, new, err, size, lrb, scb) \
-({ \
- __typeof__(ptr) __ptr = (ptr); \
- __typeof__(*(ptr)) __old = (old); \
- __typeof__(*(ptr)) __new = (new); \
- __typeof__(*(ptr)) __ret; \
- __typeof__(err) __err = 0; \
- register unsigned int __rc; \
- __enable_user_access(); \
- switch (size) { \
- case 4: \
- __asm__ __volatile__ ( \
- "0:\n" \
- " lr.w" #scb " %[ret], %[ptr]\n" \
- " bne %[ret], %z[old], 1f\n" \
- " sc.w" #lrb " %[rc], %z[new], %[ptr]\n" \
- " bnez %[rc], 0b\n" \
- "1:\n" \
- ".section .fixup,\"ax\"\n" \
- ".balign 4\n" \
- "2:\n" \
- " li %[err], %[efault]\n" \
- " jump 1b, %[rc]\n" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n" \
- ".balign " RISCV_SZPTR "\n" \
- " " RISCV_PTR " 1b, 2b\n" \
- ".previous\n" \
- : [ret] "=&r" (__ret), \
- [rc] "=&r" (__rc), \
- [ptr] "+A" (*__ptr), \
- [err] "=&r" (__err) \
- : [old] "rJ" (__old), \
- [new] "rJ" (__new), \
- [efault] "i" (-EFAULT)); \
- break; \
- case 8: \
- __asm__ __volatile__ ( \
- "0:\n" \
- " lr.d" #scb " %[ret], %[ptr]\n" \
- " bne %[ret], %z[old], 1f\n" \
- " sc.d" #lrb " %[rc], %z[new], %[ptr]\n" \
- " bnez %[rc], 0b\n" \
- "1:\n" \
- ".section .fixup,\"ax\"\n" \
- ".balign 4\n" \
- "2:\n" \
- " li %[err], %[efault]\n" \
- " jump 1b, %[rc]\n" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n" \
- ".balign " RISCV_SZPTR "\n" \
- " " RISCV_PTR " 1b, 2b\n" \
- ".previous\n" \
- : [ret] "=&r" (__ret), \
- [rc] "=&r" (__rc), \
- [ptr] "+A" (*__ptr), \
- [err] "=&r" (__err) \
- : [old] "rJ" (__old), \
- [new] "rJ" (__new), \
- [efault] "i" (-EFAULT)); \
- break; \
- default: \
- BUILD_BUG(); \
- } \
- __disable_user_access(); \
- (err) = __err; \
- __ret; \
-})
-
#define HAVE_GET_KERNEL_NOFAULT
#define __get_kernel_nofault(dst, src, type, err_label) \
--
2.33.0
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