[PATCH v6 02/13] iov_iter: Be consistent about the __user tag on copy_mc_to_user()
From: David Howells <dhowells@redhat.com>
Date: 2023-09-22 12:03:36
Also in:
linux-block, linux-fsdevel, linux-mm, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
copy_mc_to_user() has the destination marked __user on powerpc, but not on
x86; the latter results in a sparse warning in lib/iov_iter.c.
Fix this by applying the tag on x86 too.
Fixes: ec6347bb4339 ("x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}()")
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Dan Williams <redacted>
cc: Alexander Viro <viro@zeniv.linux.org.uk>
cc: Jens Axboe <axboe@kernel.dk>
cc: Christoph Hellwig <hch@lst.de>
cc: Christian Brauner <christian@brauner.io>
cc: Matthew Wilcox <willy@infradead.org>
cc: Linus Torvalds <torvalds@linux-foundation.org>
cc: David Laight <redacted>
cc: linux-block@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
---
arch/x86/include/asm/uaccess.h | 2 +-
arch/x86/lib/copy_mc.c | 8 ++++----
2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h
index 8bae40a66282..5c367c1290c3 100644
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h@@ -496,7 +496,7 @@ copy_mc_to_kernel(void *to, const void *from, unsigned len); #define copy_mc_to_kernel copy_mc_to_kernel unsigned long __must_check -copy_mc_to_user(void *to, const void *from, unsigned len); +copy_mc_to_user(void __user *to, const void *from, unsigned len); #endif /*
diff --git a/arch/x86/lib/copy_mc.c b/arch/x86/lib/copy_mc.c
index 80efd45a7761..6e8b7e600def 100644
--- a/arch/x86/lib/copy_mc.c
+++ b/arch/x86/lib/copy_mc.c@@ -70,23 +70,23 @@ unsigned long __must_check copy_mc_to_kernel(void *dst, const void *src, unsigne } EXPORT_SYMBOL_GPL(copy_mc_to_kernel); -unsigned long __must_check copy_mc_to_user(void *dst, const void *src, unsigned len) +unsigned long __must_check copy_mc_to_user(void __user *dst, const void *src, unsigned len) { unsigned long ret; if (copy_mc_fragile_enabled) { __uaccess_begin(); - ret = copy_mc_fragile(dst, src, len); + ret = copy_mc_fragile((__force void *)dst, src, len); __uaccess_end(); return ret; } if (static_cpu_has(X86_FEATURE_ERMS)) { __uaccess_begin(); - ret = copy_mc_enhanced_fast_string(dst, src, len); + ret = copy_mc_enhanced_fast_string((__force void *)dst, src, len); __uaccess_end(); return ret; } - return copy_user_generic(dst, src, len); + return copy_user_generic((__force void *)dst, src, len); }