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iov_iter, x86: Be consistent about the __user tag on copy_mc_to_user()

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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: ec6347bb43 ("x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}()")
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20230925120309.1731676-3-dhowells@redhat.com
cc: Dan Williams <dan.j.williams@intel.com>
cc: Thomas Gleixner <tglx@linutronix.de>
cc: Ingo Molnar <mingo@redhat.com>
cc: Borislav Petkov <bp@alien8.de>
cc: Dave Hansen <dave.hansen@linux.intel.com>
cc: "H. Peter Anvin" <hpa@zytor.com>
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 <David.Laight@ACULAB.COM>
cc: x86@kernel.org
cc: linux-block@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
David Howells 2023-09-25 13:02:59 +01:00 committed by Christian Brauner
parent 581beb4fe3
commit 066baf92be
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GPG Key ID: 91C61BC06578DCA2
2 changed files with 5 additions and 5 deletions
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2
arch/x86/include/asm/uaccess.h
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@ -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
/*

8
arch/x86/lib/copy_mc.c
View File

@ -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);
}